Auto code-generation for .fbs.h in arrow

1 files changed, 2100 insertions, 0 deletions

diff --git a/contrib/libs/flatbuffers/src/idl_gen_csharp.cpp b/contrib/libs/flatbuffers/src/idl_gen_csharp.cpp
new file mode 100644
index 0000000000..681ab6d642
--- /dev/null
+++ b/contrib/libs/flatbuffers/src/idl_gen_csharp.cpp
@@ -0,0 +1,2100 @@
+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// independent from idl_parser, since this code is not needed for most clients
+
+#include "flatbuffers/code_generators.h"
+#include "flatbuffers/flatbuffers.h"
+#include "flatbuffers/idl.h"
+#include "flatbuffers/util.h"
+
+#if defined(FLATBUFFERS_CPP98_STL)
+#  include <cctype>
+#endif  // defined(FLATBUFFERS_CPP98_STL)
+
+namespace flatbuffers {
+
+static TypedFloatConstantGenerator CSharpFloatGen("Double.", "Single.", "NaN",
+                                                  "PositiveInfinity",
+                                                  "NegativeInfinity");
+static CommentConfig comment_config = {
+  nullptr,
+  "///",
+  nullptr,
+};
+
+namespace csharp {
+class CSharpGenerator : public BaseGenerator {
+  struct FieldArrayLength {
+    std::string name;
+    int length;
+  };
+
+ public:
+  CSharpGenerator(const Parser &parser, const std::string &path,
+                  const std::string &file_name)
+      : BaseGenerator(parser, path, file_name, "", ".", "cs"),
+        cur_name_space_(nullptr) {}
+
+  CSharpGenerator &operator=(const CSharpGenerator &);
+
+  bool generate() {
+    std::string one_file_code;
+    cur_name_space_ = parser_.current_namespace_;
+
+    for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
+         ++it) {
+      std::string enumcode;
+      auto &enum_def = **it;
+      if (!parser_.opts.one_file) cur_name_space_ = enum_def.defined_namespace;
+      GenEnum(enum_def, &enumcode, parser_.opts);
+      if (parser_.opts.one_file) {
+        one_file_code += enumcode;
+      } else {
+        if (!SaveType(enum_def.name, *enum_def.defined_namespace, enumcode,
+                      false))
+          return false;
+      }
+    }
+
+    for (auto it = parser_.structs_.vec.begin();
+         it != parser_.structs_.vec.end(); ++it) {
+      std::string declcode;
+      auto &struct_def = **it;
+      if (!parser_.opts.one_file)
+        cur_name_space_ = struct_def.defined_namespace;
+      GenStruct(struct_def, &declcode, parser_.opts);
+      if (parser_.opts.one_file) {
+        one_file_code += declcode;
+      } else {
+        if (!SaveType(struct_def.name, *struct_def.defined_namespace, declcode,
+                      true))
+          return false;
+      }
+    }
+
+    if (parser_.opts.one_file) {
+      return SaveType(file_name_, *parser_.current_namespace_, one_file_code,
+                      true);
+    }
+    return true;
+  }
+
+  // Save out the generated code for a single class while adding
+  // declaration boilerplate.
+  bool SaveType(const std::string &defname, const Namespace &ns,
+                const std::string &classcode, bool needs_includes) const {
+    if (!classcode.length()) return true;
+
+    std::string code =
+        "// <auto-generated>\n"
+        "//  " +
+        std::string(FlatBuffersGeneratedWarning()) +
+        "\n"
+        "// </auto-generated>\n\n";
+
+    std::string namespace_name = FullNamespace(".", ns);
+    if (!namespace_name.empty()) {
+      code += "namespace " + namespace_name + "\n{\n\n";
+    }
+    if (needs_includes) {
+      code += "using global::System;\n";
+      code += "using global::System.Collections.Generic;\n";
+      code += "using global::FlatBuffers;\n\n";
+    }
+    code += classcode;
+    if (!namespace_name.empty()) { code += "\n}\n"; }
+    auto filename = NamespaceDir(ns) + defname + ".cs";
+    return SaveFile(filename.c_str(), code, false);
+  }
+
+  const Namespace *CurrentNameSpace() const { return cur_name_space_; }
+
+  std::string GenTypeBasic(const Type &type, bool enableLangOverrides) const {
+    // clang-format off
+    static const char * const csharp_typename[] = {
+      #define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, ...) \
+        #NTYPE,
+        FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
+      #undef FLATBUFFERS_TD
+    };
+    // clang-format on
+
+    if (enableLangOverrides) {
+      if (IsEnum(type)) return WrapInNameSpace(*type.enum_def);
+      if (type.base_type == BASE_TYPE_STRUCT) {
+        return "Offset<" + WrapInNameSpace(*type.struct_def) + ">";
+      }
+    }
+
+    return csharp_typename[type.base_type];
+  }
+
+  inline std::string GenTypeBasic(const Type &type) const {
+    return GenTypeBasic(type, true);
+  }
+
+  std::string GenTypePointer(const Type &type) const {
+    switch (type.base_type) {
+      case BASE_TYPE_STRING: return "string";
+      case BASE_TYPE_VECTOR: return GenTypeGet(type.VectorType());
+      case BASE_TYPE_STRUCT: return WrapInNameSpace(*type.struct_def);
+      case BASE_TYPE_UNION: return "TTable";
+      default: return "Table";
+    }
+  }
+
+  std::string GenTypeGet(const Type &type) const {
+    return IsScalar(type.base_type)
+               ? GenTypeBasic(type)
+               : (IsArray(type) ? GenTypeGet(type.VectorType())
+                                : GenTypePointer(type));
+  }
+
+  std::string GenOffsetType(const StructDef &struct_def) const {
+    return "Offset<" + WrapInNameSpace(struct_def) + ">";
+  }
+
+  std::string GenOffsetConstruct(const StructDef &struct_def,
+                                 const std::string &variable_name) const {
+    return "new Offset<" + WrapInNameSpace(struct_def) + ">(" + variable_name +
+           ")";
+  }
+
+  // Casts necessary to correctly read serialized data
+  std::string DestinationCast(const Type &type) const {
+    if (IsSeries(type)) {
+      return DestinationCast(type.VectorType());
+    } else {
+      if (IsEnum(type)) return "(" + WrapInNameSpace(*type.enum_def) + ")";
+    }
+    return "";
+  }
+
+  // Cast statements for mutator method parameters.
+  // In Java, parameters representing unsigned numbers need to be cast down to
+  // their respective type. For example, a long holding an unsigned int value
+  // would be cast down to int before being put onto the buffer. In C#, one cast
+  // directly cast an Enum to its underlying type, which is essential before
+  // putting it onto the buffer.
+  std::string SourceCast(const Type &type) const {
+    if (IsSeries(type)) {
+      return SourceCast(type.VectorType());
+    } else {
+      if (IsEnum(type)) return "(" + GenTypeBasic(type, false) + ")";
+    }
+    return "";
+  }
+
+  std::string SourceCastBasic(const Type &type) const {
+    return IsScalar(type.base_type) ? SourceCast(type) : "";
+  }
+
+  std::string GenEnumDefaultValue(const FieldDef &field) const {
+    auto &value = field.value;
+    FLATBUFFERS_ASSERT(value.type.enum_def);
+    auto &enum_def = *value.type.enum_def;
+    auto enum_val = enum_def.FindByValue(value.constant);
+    return enum_val ? (WrapInNameSpace(enum_def) + "." + enum_val->name)
+                    : value.constant;
+  }
+
+  std::string GenDefaultValue(const FieldDef &field,
+                              bool enableLangOverrides) const {
+    // If it is an optional scalar field, the default is null
+    if (field.IsScalarOptional()) { return "null"; }
+
+    auto &value = field.value;
+    if (enableLangOverrides) {
+      // handles both enum case and vector of enum case
+      if (value.type.enum_def != nullptr &&
+          value.type.base_type != BASE_TYPE_UNION) {
+        return GenEnumDefaultValue(field);
+      }
+    }
+
+    auto longSuffix = "";
+    switch (value.type.base_type) {
+      case BASE_TYPE_BOOL: return value.constant == "0" ? "false" : "true";
+      case BASE_TYPE_ULONG: return value.constant;
+      case BASE_TYPE_UINT:
+      case BASE_TYPE_LONG: return value.constant + longSuffix;
+      default:
+        if (IsFloat(value.type.base_type))
+          return CSharpFloatGen.GenFloatConstant(field);
+        else
+          return value.constant;
+    }
+  }
+
+  std::string GenDefaultValue(const FieldDef &field) const {
+    return GenDefaultValue(field, true);
+  }
+
+  std::string GenDefaultValueBasic(const FieldDef &field,
+                                   bool enableLangOverrides) const {
+    auto &value = field.value;
+    if (!IsScalar(value.type.base_type)) {
+      if (enableLangOverrides) {
+        switch (value.type.base_type) {
+          case BASE_TYPE_STRING: return "default(StringOffset)";
+          case BASE_TYPE_STRUCT:
+            return "default(Offset<" + WrapInNameSpace(*value.type.struct_def) +
+                   ">)";
+          case BASE_TYPE_VECTOR: return "default(VectorOffset)";
+          default: break;
+        }
+      }
+      return "0";
+    }
+    return GenDefaultValue(field, enableLangOverrides);
+  }
+
+  std::string GenDefaultValueBasic(const FieldDef &field) const {
+    return GenDefaultValueBasic(field, true);
+  }
+
+  void GenEnum(EnumDef &enum_def, std::string *code_ptr,
+               const IDLOptions &opts) const {
+    std::string &code = *code_ptr;
+    if (enum_def.generated) return;
+
+    // Generate enum definitions of the form:
+    // public static (final) int name = value;
+    // In Java, we use ints rather than the Enum feature, because we want them
+    // to map directly to how they're used in C/C++ and file formats.
+    // That, and Java Enums are expensive, and not universally liked.
+    GenComment(enum_def.doc_comment, code_ptr, &comment_config);
+
+    if (opts.cs_gen_json_serializer && opts.generate_object_based_api) {
+      code +=
+          "[Newtonsoft.Json.JsonConverter(typeof(Newtonsoft.Json.Converters."
+          "StringEnumConverter))]\n";
+    }
+    // In C# this indicates enumeration values can be treated as bit flags.
+    if (enum_def.attributes.Lookup("bit_flags")) {
+      code += "[System.FlagsAttribute]\n";
+    }
+    if (enum_def.attributes.Lookup("private")) {
+      code += "internal ";
+    } else {
+      code += "public ";
+    }
+    code += "enum " + enum_def.name;
+    code += " : " + GenTypeBasic(enum_def.underlying_type, false);
+    code += "\n{\n";
+    for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
+      auto &ev = **it;
+      GenComment(ev.doc_comment, code_ptr, &comment_config, "  ");
+      code += "  ";
+      code += ev.name + " = ";
+      code += enum_def.ToString(ev);
+      code += ",\n";
+    }
+    // Close the class
+    code += "};\n\n";
+
+    if (opts.generate_object_based_api) {
+      GenEnum_ObjectAPI(enum_def, code_ptr, opts);
+    }
+  }
+
+  bool HasUnionStringValue(const EnumDef &enum_def) const {
+    if (!enum_def.is_union) return false;
+    for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
+      auto &val = **it;
+      if (IsString(val.union_type)) { return true; }
+    }
+    return false;
+  }
+
+  // Returns the function name that is able to read a value of the given type.
+  std::string GenGetter(const Type &type) const {
+    switch (type.base_type) {
+      case BASE_TYPE_STRING: return "__p.__string";
+      case BASE_TYPE_STRUCT: return "__p.__struct";
+      case BASE_TYPE_UNION: return "__p.__union";
+      case BASE_TYPE_VECTOR: return GenGetter(type.VectorType());
+      case BASE_TYPE_ARRAY: return GenGetter(type.VectorType());
+      default: {
+        std::string getter = "__p.bb.Get";
+        if (type.base_type == BASE_TYPE_BOOL) {
+          getter = "0!=" + getter;
+        } else if (GenTypeBasic(type, false) != "byte") {
+          getter += MakeCamel(GenTypeBasic(type, false));
+        }
+        return getter;
+      }
+    }
+  }
+
+  // Returns the function name that is able to read a value of the given type.
+  std::string GenGetterForLookupByKey(flatbuffers::FieldDef *key_field,
+                                      const std::string &data_buffer,
+                                      const char *num = nullptr) const {
+    auto type = key_field->value.type;
+    auto dest_mask = "";
+    auto dest_cast = DestinationCast(type);
+    auto getter = data_buffer + ".Get";
+    if (GenTypeBasic(type, false) != "byte") {
+      getter += MakeCamel(GenTypeBasic(type, false));
+    }
+    getter = dest_cast + getter + "(" + GenOffsetGetter(key_field, num) + ")" +
+             dest_mask;
+    return getter;
+  }
+
+  // Direct mutation is only allowed for scalar fields.
+  // Hence a setter method will only be generated for such fields.
+  std::string GenSetter(const Type &type) const {
+    if (IsScalar(type.base_type)) {
+      std::string setter = "__p.bb.Put";
+      if (GenTypeBasic(type, false) != "byte" &&
+          type.base_type != BASE_TYPE_BOOL) {
+        setter += MakeCamel(GenTypeBasic(type, false));
+      }
+      return setter;
+    } else {
+      return "";
+    }
+  }
+
+  // Returns the method name for use with add/put calls.
+  std::string GenMethod(const Type &type) const {
+    return IsScalar(type.base_type) ? MakeCamel(GenTypeBasic(type, false))
+                                    : (IsStruct(type) ? "Struct" : "Offset");
+  }
+
+  // Recursively generate arguments for a constructor, to deal with nested
+  // structs.
+  void GenStructArgs(const StructDef &struct_def, std::string *code_ptr,
+                     const char *nameprefix, size_t array_count = 0) const {
+    std::string &code = *code_ptr;
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      const auto &field_type = field.value.type;
+      const auto array_field = IsArray(field_type);
+      const auto &type = array_field ? field_type.VectorType() : field_type;
+      const auto array_cnt = array_field ? (array_count + 1) : array_count;
+      if (IsStruct(type)) {
+        // Generate arguments for a struct inside a struct. To ensure names
+        // don't clash, and to make it obvious these arguments are constructing
+        // a nested struct, prefix the name with the field name.
+        GenStructArgs(*field_type.struct_def, code_ptr,
+                      (nameprefix + (field.name + "_")).c_str(), array_cnt);
+      } else {
+        code += ", ";
+        code += GenTypeBasic(type);
+        if (field.IsScalarOptional()) { code += "?"; }
+        if (array_cnt > 0) {
+          code += "[";
+          for (size_t i = 1; i < array_cnt; i++) code += ",";
+          code += "]";
+        }
+        code += " ";
+        code += nameprefix;
+        code += MakeCamel(field.name, true);
+      }
+    }
+  }
+
+  // Recusively generate struct construction statements of the form:
+  // builder.putType(name);
+  // and insert manual padding.
+  void GenStructBody(const StructDef &struct_def, std::string *code_ptr,
+                     const char *nameprefix, size_t index = 0,
+                     bool in_array = false) const {
+    std::string &code = *code_ptr;
+    std::string indent((index + 1) * 2, ' ');
+    code += indent + "  builder.Prep(";
+    code += NumToString(struct_def.minalign) + ", ";
+    code += NumToString(struct_def.bytesize) + ");\n";
+    for (auto it = struct_def.fields.vec.rbegin();
+         it != struct_def.fields.vec.rend(); ++it) {
+      auto &field = **it;
+      const auto &field_type = field.value.type;
+      if (field.padding) {
+        code += indent + "  builder.Pad(";
+        code += NumToString(field.padding) + ");\n";
+      }
+      if (IsStruct(field_type)) {
+        GenStructBody(*field_type.struct_def, code_ptr,
+                      (nameprefix + (field.name + "_")).c_str(), index,
+                      in_array);
+      } else {
+        const auto &type =
+            IsArray(field_type) ? field_type.VectorType() : field_type;
+        const auto index_var = "_idx" + NumToString(index);
+        if (IsArray(field_type)) {
+          code += indent + "  for (int " + index_var + " = ";
+          code += NumToString(field_type.fixed_length);
+          code += "; " + index_var + " > 0; " + index_var + "--) {\n";
+          in_array = true;
+        }
+        if (IsStruct(type)) {
+          GenStructBody(*field_type.struct_def, code_ptr,
+                        (nameprefix + (field.name + "_")).c_str(), index + 1,
+                        in_array);
+        } else {
+          code += IsArray(field_type) ? "  " : "";
+          code += indent + "  builder.Put";
+          code += GenMethod(type) + "(";
+          code += SourceCast(type);
+          auto argname = nameprefix + MakeCamel(field.name, true);
+          code += argname;
+          size_t array_cnt = index + (IsArray(field_type) ? 1 : 0);
+          if (array_cnt > 0) {
+            code += "[";
+            for (size_t i = 0; in_array && i < array_cnt; i++) {
+              code += "_idx" + NumToString(i) + "-1";
+              if (i != (array_cnt - 1)) code += ",";
+            }
+            code += "]";
+          }
+          code += ");\n";
+        }
+        if (IsArray(field_type)) { code += indent + "  }\n"; }
+      }
+    }
+  }
+  std::string GenOffsetGetter(flatbuffers::FieldDef *key_field,
+                              const char *num = nullptr) const {
+    std::string key_offset =
+        "Table.__offset(" + NumToString(key_field->value.offset) + ", ";
+    if (num) {
+      key_offset += num;
+      key_offset += ".Value, builder.DataBuffer)";
+    } else {
+      key_offset += "bb.Length";
+      key_offset += " - tableOffset, bb)";
+    }
+    return key_offset;
+  }
+
+  std::string GenLookupKeyGetter(flatbuffers::FieldDef *key_field) const {
+    std::string key_getter = "      ";
+    key_getter += "int tableOffset = Table.";
+    key_getter += "__indirect(vectorLocation + 4 * (start + middle)";
+    key_getter += ", bb);\n      ";
+    if (IsString(key_field->value.type)) {
+      key_getter += "int comp = Table.";
+      key_getter += "CompareStrings(";
+      key_getter += GenOffsetGetter(key_field);
+      key_getter += ", byteKey, bb);\n";
+    } else {
+      auto get_val = GenGetterForLookupByKey(key_field, "bb");
+      key_getter += "int comp = " + get_val + ".CompareTo(key);\n";
+    }
+    return key_getter;
+  }
+
+  std::string GenKeyGetter(flatbuffers::FieldDef *key_field) const {
+    std::string key_getter = "";
+    auto data_buffer = "builder.DataBuffer";
+    if (IsString(key_field->value.type)) {
+      key_getter += "Table.CompareStrings(";
+      key_getter += GenOffsetGetter(key_field, "o1") + ", ";
+      key_getter += GenOffsetGetter(key_field, "o2") + ", " + data_buffer + ")";
+    } else {
+      auto field_getter = GenGetterForLookupByKey(key_field, data_buffer, "o1");
+      key_getter += field_getter;
+      field_getter = GenGetterForLookupByKey(key_field, data_buffer, "o2");
+      key_getter += ".CompareTo(" + field_getter + ")";
+    }
+    return key_getter;
+  }
+
+  void GenStruct(StructDef &struct_def, std::string *code_ptr,
+                 const IDLOptions &opts) const {
+    if (struct_def.generated) return;
+    std::string &code = *code_ptr;
+
+    // Generate a struct accessor class, with methods of the form:
+    // public type name() { return bb.getType(i + offset); }
+    // or for tables of the form:
+    // public type name() {
+    //   int o = __offset(offset); return o != 0 ? bb.getType(o + i) : default;
+    // }
+    GenComment(struct_def.doc_comment, code_ptr, &comment_config);
+    if (struct_def.attributes.Lookup("private")) {
+      code += "internal ";
+    } else {
+      code += "public ";
+    }
+    if (struct_def.attributes.Lookup("csharp_partial")) {
+      // generate a partial class for this C# struct/table
+      code += "partial ";
+    }
+    code += "struct " + struct_def.name;
+    code += " : IFlatbufferObject";
+    code += "\n{\n";
+    code += "  private ";
+    code += struct_def.fixed ? "Struct" : "Table";
+    code += " __p;\n";
+
+    code += "  public ByteBuffer ByteBuffer { get { return __p.bb; } }\n";
+
+    if (!struct_def.fixed) {
+      // Generate verson check method.
+      // Force compile time error if not using the same version runtime.
+      code += "  public static void ValidateVersion() {";
+      code += " FlatBufferConstants.";
+      code += "FLATBUFFERS_2_0_0(); ";
+      code += "}\n";
+
+      // Generate a special accessor for the table that when used as the root
+      // of a FlatBuffer
+      std::string method_name = "GetRootAs" + struct_def.name;
+      std::string method_signature =
+          "  public static " + struct_def.name + " " + method_name;
+
+      // create convenience method that doesn't require an existing object
+      code += method_signature + "(ByteBuffer _bb) ";
+      code += "{ return " + method_name + "(_bb, new " + struct_def.name +
+              "()); }\n";
+
+      // create method that allows object reuse
+      code +=
+          method_signature + "(ByteBuffer _bb, " + struct_def.name + " obj) { ";
+      code += "return (obj.__assign(_bb.GetInt(_bb.Position";
+      code += ") + _bb.Position";
+      code += ", _bb)); }\n";
+      if (parser_.root_struct_def_ == &struct_def) {
+        if (parser_.file_identifier_.length()) {
+          // Check if a buffer has the identifier.
+          code += "  public static ";
+          code += "bool " + struct_def.name;
+          code += "BufferHasIdentifier(ByteBuffer _bb) { return ";
+          code += "Table.__has_identifier(_bb, \"";
+          code += parser_.file_identifier_;
+          code += "\"); }\n";
+        }
+      }
+    }
+    // Generate the __init method that sets the field in a pre-existing
+    // accessor object. This is to allow object reuse.
+    code += "  public void __init(int _i, ByteBuffer _bb) ";
+    code += "{ ";
+    code += "__p = new ";
+    code += struct_def.fixed ? "Struct" : "Table";
+    code += "(_i, _bb); ";
+    code += "}\n";
+    code +=
+        "  public " + struct_def.name + " __assign(int _i, ByteBuffer _bb) ";
+    code += "{ __init(_i, _bb); return this; }\n\n";
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      if (field.deprecated) continue;
+      GenComment(field.doc_comment, code_ptr, &comment_config, "  ");
+      std::string type_name = GenTypeGet(field.value.type);
+      std::string type_name_dest = GenTypeGet(field.value.type);
+      std::string conditional_cast = "";
+      std::string optional = "";
+      if (!struct_def.fixed &&
+          (field.value.type.base_type == BASE_TYPE_STRUCT ||
+           field.value.type.base_type == BASE_TYPE_UNION ||
+           (IsVector(field.value.type) &&
+            (field.value.type.element == BASE_TYPE_STRUCT ||
+             field.value.type.element == BASE_TYPE_UNION)))) {
+        optional = "?";
+        conditional_cast = "(" + type_name_dest + optional + ")";
+      }
+      if (field.IsScalarOptional()) { optional = "?"; }
+      std::string dest_mask = "";
+      std::string dest_cast = DestinationCast(field.value.type);
+      std::string src_cast = SourceCast(field.value.type);
+      std::string field_name_camel = MakeCamel(field.name, true);
+      std::string method_start =
+          "  public " + type_name_dest + optional + " " + field_name_camel;
+      std::string obj = "(new " + type_name + "())";
+
+      // Most field accessors need to retrieve and test the field offset first,
+      // this is the prefix code for that:
+      auto offset_prefix =
+          IsArray(field.value.type)
+              ? " { return "
+              : (" { int o = __p.__offset(" + NumToString(field.value.offset) +
+                 "); return o != 0 ? ");
+      // Generate the accessors that don't do object reuse.
+      if (field.value.type.base_type == BASE_TYPE_STRUCT) {
+      } else if (IsVector(field.value.type) &&
+                 field.value.type.element == BASE_TYPE_STRUCT) {
+      } else if (field.value.type.base_type == BASE_TYPE_UNION ||
+                 (IsVector(field.value.type) &&
+                  field.value.type.VectorType().base_type == BASE_TYPE_UNION)) {
+        method_start += "<TTable>";
+        type_name = type_name_dest;
+      }
+      std::string getter = dest_cast + GenGetter(field.value.type);
+      code += method_start;
+      std::string default_cast = "";
+      // only create default casts for c# scalars or vectors of scalars
+      if ((IsScalar(field.value.type.base_type) ||
+           (IsVector(field.value.type) &&
+            IsScalar(field.value.type.element)))) {
+        // For scalars, default value will be returned by GetDefaultValue().
+        // If the scalar is an enum, GetDefaultValue() returns an actual c# enum
+        // that doesn't need to be casted. However, default values for enum
+        // elements of vectors are integer literals ("0") and are still casted
+        // for clarity.
+        // If the scalar is optional and enum, we still need the cast.
+        if ((field.value.type.enum_def == nullptr ||
+             IsVector(field.value.type)) ||
+            (IsEnum(field.value.type) && field.IsScalarOptional())) {
+          default_cast = "(" + type_name_dest + optional + ")";
+        }
+      }
+      std::string member_suffix = "; ";
+      if (IsScalar(field.value.type.base_type)) {
+        code += " { get";
+        member_suffix += "} ";
+        if (struct_def.fixed) {
+          code += " { return " + getter;
+          code += "(__p.bb_pos + ";
+          code += NumToString(field.value.offset) + ")";
+          code += dest_mask;
+        } else {
+          code += offset_prefix + getter;
+          code += "(o + __p.bb_pos)" + dest_mask;
+          code += " : " + default_cast;
+          code += GenDefaultValue(field);
+        }
+      } else {
+        switch (field.value.type.base_type) {
+          case BASE_TYPE_STRUCT:
+            code += " { get";
+            member_suffix += "} ";
+            if (struct_def.fixed) {
+              code += " { return " + obj + ".__assign(" + "__p.";
+              code += "bb_pos + " + NumToString(field.value.offset) + ", ";
+              code += "__p.bb)";
+            } else {
+              code += offset_prefix + conditional_cast;
+              code += obj + ".__assign(";
+              code += field.value.type.struct_def->fixed
+                          ? "o + __p.bb_pos"
+                          : "__p.__indirect(o + __p.bb_pos)";
+              code += ", __p.bb) : null";
+            }
+            break;
+          case BASE_TYPE_STRING:
+            code += " { get";
+            member_suffix += "} ";
+            code += offset_prefix + getter + "(o + " + "__p.";
+            code += "bb_pos) : null";
+            break;
+          case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH();  // fall thru
+          case BASE_TYPE_VECTOR: {
+            auto vectortype = field.value.type.VectorType();
+            if (vectortype.base_type == BASE_TYPE_UNION) {
+              conditional_cast = "(TTable?)";
+              getter += "<TTable>";
+            }
+            code += "(";
+            if (vectortype.base_type == BASE_TYPE_STRUCT) {
+              getter = obj + ".__assign";
+            } else if (vectortype.base_type == BASE_TYPE_UNION) {
+            }
+            code += "int j)";
+            const auto body = offset_prefix + conditional_cast + getter + "(";
+            if (vectortype.base_type == BASE_TYPE_UNION) {
+              code += " where TTable : struct, IFlatbufferObject" + body;
+            } else {
+              code += body;
+            }
+            std::string index = "__p.";
+            if (IsArray(field.value.type)) {
+              index += "bb_pos + " + NumToString(field.value.offset) + " + ";
+            } else {
+              index += "__vector(o) + ";
+            }
+            index += "j * " + NumToString(InlineSize(vectortype));
+            if (vectortype.base_type == BASE_TYPE_STRUCT) {
+              code += vectortype.struct_def->fixed
+                          ? index
+                          : "__p.__indirect(" + index + ")";
+              code += ", __p.bb";
+            } else {
+              code += index;
+            }
+            code += ")" + dest_mask;
+            if (!IsArray(field.value.type)) {
+              code += " : ";
+              code +=
+                  field.value.type.element == BASE_TYPE_BOOL
+                      ? "false"
+                      : (IsScalar(field.value.type.element) ? default_cast + "0"
+                                                            : "null");
+            }
+            if (vectortype.base_type == BASE_TYPE_UNION &&
+                HasUnionStringValue(*vectortype.enum_def)) {
+              code += member_suffix;
+              code += "}\n";
+              code += "  public string " + MakeCamel(field.name, true) +
+                      "AsString(int j)";
+              code += offset_prefix + GenGetter(Type(BASE_TYPE_STRING));
+              code += "(" + index + ") : null";
+            }
+            break;
+          }
+          case BASE_TYPE_UNION:
+            code += "() where TTable : struct, IFlatbufferObject";
+            code += offset_prefix + "(TTable?)" + getter;
+            code += "<TTable>(o + __p.bb_pos) : null";
+            if (HasUnionStringValue(*field.value.type.enum_def)) {
+              code += member_suffix;
+              code += "}\n";
+              code += "  public string " + MakeCamel(field.name, true) +
+                      "AsString()";
+              code += offset_prefix + GenGetter(Type(BASE_TYPE_STRING));
+              code += "(o + __p.bb_pos) : null";
+            }
+            // As<> accesors for Unions
+            // Loop through all the possible union types and generate an As
+            // accessor that casts to the correct type.
+            for (auto uit = field.value.type.enum_def->Vals().begin();
+                 uit != field.value.type.enum_def->Vals().end(); ++uit) {
+              auto val = *uit;
+              if (val->union_type.base_type == BASE_TYPE_NONE) { continue; }
+              auto union_field_type_name = GenTypeGet(val->union_type);
+              code += member_suffix + "}\n";
+              if (val->union_type.base_type == BASE_TYPE_STRUCT &&
+                  val->union_type.struct_def->attributes.Lookup("private")) {
+                code += "  internal ";
+              } else {
+                code += "  public ";
+              }
+              code += union_field_type_name + " ";
+              code += field_name_camel + "As" + val->name + "() { return ";
+              code += field_name_camel;
+              if (IsString(val->union_type)) {
+                code += "AsString()";
+              } else {
+                code += "<" + union_field_type_name + ">().Value";
+              }
+            }
+            break;
+          default: FLATBUFFERS_ASSERT(0);
+        }
+      }
+      code += member_suffix;
+      code += "}\n";
+      if (IsVector(field.value.type)) {
+        code += "  public int " + MakeCamel(field.name, true);
+        code += "Length";
+        code += " { get";
+        code += offset_prefix;
+        code += "__p.__vector_len(o) : 0; ";
+        code += "} ";
+        code += "}\n";
+        // See if we should generate a by-key accessor.
+        if (field.value.type.element == BASE_TYPE_STRUCT &&
+            !field.value.type.struct_def->fixed) {
+          auto &sd = *field.value.type.struct_def;
+          auto &fields = sd.fields.vec;
+          for (auto kit = fields.begin(); kit != fields.end(); ++kit) {
+            auto &key_field = **kit;
+            if (key_field.key) {
+              auto qualified_name = WrapInNameSpace(sd);
+              code += "  public " + qualified_name + "? ";
+              code += MakeCamel(field.name, true) + "ByKey(";
+              code += GenTypeGet(key_field.value.type) + " key)";
+              code += offset_prefix;
+              code += qualified_name + ".__lookup_by_key(";
+              code += "__p.__vector(o), key, ";
+              code += "__p.bb) : null; ";
+              code += "}\n";
+              break;
+            }
+          }
+        }
+      }
+      // Generate a ByteBuffer accessor for strings & vectors of scalars.
+      if ((IsVector(field.value.type) &&
+           IsScalar(field.value.type.VectorType().base_type)) ||
+          IsString(field.value.type)) {
+        code += "#if ENABLE_SPAN_T\n";
+        code += "  public Span<" + GenTypeBasic(field.value.type.VectorType()) +
+                "> Get";
+        code += MakeCamel(field.name, true);
+        code += "Bytes() { return ";
+        code += "__p.__vector_as_span<" +
+                GenTypeBasic(field.value.type.VectorType()) + ">(";
+        code += NumToString(field.value.offset);
+        code +=
+            ", " + NumToString(SizeOf(field.value.type.VectorType().base_type));
+        code += "); }\n";
+        code += "#else\n";
+        code += "  public ArraySegment<byte>? Get";
+        code += MakeCamel(field.name, true);
+        code += "Bytes() { return ";
+        code += "__p.__vector_as_arraysegment(";
+        code += NumToString(field.value.offset);
+        code += "); }\n";
+        code += "#endif\n";
+
+        // For direct blockcopying the data into a typed array
+        code += "  public ";
+        code += GenTypeBasic(field.value.type.VectorType());
+        code += "[] Get";
+        code += MakeCamel(field.name, true);
+        code += "Array() { ";
+        if (IsEnum(field.value.type.VectorType())) {
+          // Since __vector_as_array does not work for enum types,
+          // fill array using an explicit loop.
+          code += "int o = __p.__offset(";
+          code += NumToString(field.value.offset);
+          code += "); if (o == 0) return null; int p = ";
+          code += "__p.__vector(o); int l = ";
+          code += "__p.__vector_len(o); ";
+          code += GenTypeBasic(field.value.type.VectorType());
+          code += "[] a = new ";
+          code += GenTypeBasic(field.value.type.VectorType());
+          code += "[l]; for (int i = 0; i < l; i++) { a[i] = " + getter;
+          code += "(p + i * ";
+          code += NumToString(InlineSize(field.value.type.VectorType()));
+          code += "); } return a;";
+        } else {
+          code += "return ";
+          code += "__p.__vector_as_array<";
+          code += GenTypeBasic(field.value.type.VectorType());
+          code += ">(";
+          code += NumToString(field.value.offset);
+          code += ");";
+        }
+        code += " }\n";
+      }
+      // generate object accessors if is nested_flatbuffer
+      if (field.nested_flatbuffer) {
+        auto nested_type_name = WrapInNameSpace(*field.nested_flatbuffer);
+        auto nested_method_name =
+            MakeCamel(field.name, true) + "As" + field.nested_flatbuffer->name;
+        auto get_nested_method_name = nested_method_name;
+        get_nested_method_name = "Get" + nested_method_name;
+        conditional_cast = "(" + nested_type_name + "?)";
+        obj = "(new " + nested_type_name + "())";
+        code += "  public " + nested_type_name + "? ";
+        code += get_nested_method_name + "(";
+        code += ") { int o = __p.__offset(";
+        code += NumToString(field.value.offset) + "); ";
+        code += "return o != 0 ? " + conditional_cast + obj + ".__assign(";
+        code += "__p.";
+        code += "__indirect(__p.__vector(o)), ";
+        code += "__p.bb) : null; }\n";
+      }
+      // Generate mutators for scalar fields or vectors of scalars.
+      if (parser_.opts.mutable_buffer) {
+        auto is_series = (IsSeries(field.value.type));
+        const auto &underlying_type =
+            is_series ? field.value.type.VectorType() : field.value.type;
+        // Boolean parameters have to be explicitly converted to byte
+        // representation.
+        auto setter_parameter = underlying_type.base_type == BASE_TYPE_BOOL
+                                    ? "(byte)(" + field.name + " ? 1 : 0)"
+                                    : field.name;
+        auto mutator_prefix = MakeCamel("mutate", true);
+        // A vector mutator also needs the index of the vector element it should
+        // mutate.
+        auto mutator_params = (is_series ? "(int j, " : "(") +
+                              GenTypeGet(underlying_type) + " " + field.name +
+                              ") { ";
+        auto setter_index =
+            is_series
+                ? "__p." +
+                      (IsArray(field.value.type)
+                           ? "bb_pos + " + NumToString(field.value.offset)
+                           : "__vector(o)") +
+                      +" + j * " + NumToString(InlineSize(underlying_type))
+                : (struct_def.fixed
+                       ? "__p.bb_pos + " + NumToString(field.value.offset)
+                       : "o + __p.bb_pos");
+        if (IsScalar(underlying_type.base_type) && !IsUnion(field.value.type)) {
+          code += "  public ";
+          code += struct_def.fixed ? "void " : "bool ";
+          code += mutator_prefix + MakeCamel(field.name, true);
+          code += mutator_params;
+          if (struct_def.fixed) {
+            code += GenSetter(underlying_type) + "(" + setter_index + ", ";
+            code += src_cast + setter_parameter + "); }\n";
+          } else {
+            code += "int o = __p.__offset(";
+            code += NumToString(field.value.offset) + ");";
+            code += " if (o != 0) { " + GenSetter(underlying_type);
+            code += "(" + setter_index + ", " + src_cast + setter_parameter +
+                    "); return true; } else { return false; } }\n";
+          }
+        }
+      }
+      if (parser_.opts.java_primitive_has_method &&
+          IsScalar(field.value.type.base_type) && !struct_def.fixed) {
+        auto vt_offset_constant = "  public static final int VT_" +
+                                  MakeScreamingCamel(field.name) + " = " +
+                                  NumToString(field.value.offset) + ";";
+
+        code += vt_offset_constant;
+        code += "\n";
+      }
+    }
+    code += "\n";
+    auto struct_has_create = false;
+    std::set<flatbuffers::FieldDef *> field_has_create_set;
+    flatbuffers::FieldDef *key_field = nullptr;
+    if (struct_def.fixed) {
+      struct_has_create = true;
+      // create a struct constructor function
+      code += "  public static " + GenOffsetType(struct_def) + " ";
+      code += "Create";
+      code += struct_def.name + "(FlatBufferBuilder builder";
+      GenStructArgs(struct_def, code_ptr, "");
+      code += ") {\n";
+      GenStructBody(struct_def, code_ptr, "");
+      code += "    return ";
+      code += GenOffsetConstruct(struct_def, "builder.Offset");
+      code += ";\n  }\n";
+    } else {
+      // Generate a method that creates a table in one go. This is only possible
+      // when the table has no struct fields, since those have to be created
+      // inline, and there's no way to do so in Java.
+      bool has_no_struct_fields = true;
+      int num_fields = 0;
+      for (auto it = struct_def.fields.vec.begin();
+           it != struct_def.fields.vec.end(); ++it) {
+        auto &field = **it;
+        if (field.deprecated) continue;
+        if (IsStruct(field.value.type)) {
+          has_no_struct_fields = false;
+        } else {
+          num_fields++;
+        }
+      }
+      // JVM specifications restrict default constructor params to be < 255.
+      // Longs and doubles take up 2 units, so we set the limit to be < 127.
+      if ((has_no_struct_fields || opts.generate_object_based_api) &&
+          num_fields && num_fields < 127) {
+        struct_has_create = true;
+        // Generate a table constructor of the form:
+        // public static int createName(FlatBufferBuilder builder, args...)
+        code += "  public static " + GenOffsetType(struct_def) + " ";
+        code += "Create" + struct_def.name;
+        code += "(FlatBufferBuilder builder";
+        for (auto it = struct_def.fields.vec.begin();
+             it != struct_def.fields.vec.end(); ++it) {
+          auto &field = **it;
+          if (field.deprecated) continue;
+          code += ",\n      ";
+          if (IsStruct(field.value.type) && opts.generate_object_based_api) {
+            code += WrapInNameSpace(
+                field.value.type.struct_def->defined_namespace,
+                GenTypeName_ObjectAPI(field.value.type.struct_def->name, opts));
+            code += " ";
+            code += field.name;
+            code += " = null";
+          } else {
+            code += GenTypeBasic(field.value.type);
+            if (field.IsScalarOptional()) { code += "?"; }
+            code += " ";
+            code += field.name;
+            if (!IsScalar(field.value.type.base_type)) code += "Offset";
+
+            code += " = ";
+            code += GenDefaultValueBasic(field);
+          }
+        }
+        code += ") {\n    builder.";
+        code += "StartTable(";
+        code += NumToString(struct_def.fields.vec.size()) + ");\n";
+        for (size_t size = struct_def.sortbysize ? sizeof(largest_scalar_t) : 1;
+             size; size /= 2) {
+          for (auto it = struct_def.fields.vec.rbegin();
+               it != struct_def.fields.vec.rend(); ++it) {
+            auto &field = **it;
+            if (!field.deprecated &&
+                (!struct_def.sortbysize ||
+                 size == SizeOf(field.value.type.base_type))) {
+              code += "    " + struct_def.name + ".";
+              code += "Add";
+              code += MakeCamel(field.name) + "(builder, ";
+              if (IsStruct(field.value.type) &&
+                  opts.generate_object_based_api) {
+                code += GenTypePointer(field.value.type) + ".Pack(builder, " +
+                        field.name + ")";
+              } else {
+                code += field.name;
+                if (!IsScalar(field.value.type.base_type)) code += "Offset";
+              }
+
+              code += ");\n";
+            }
+          }
+        }
+        code += "    return " + struct_def.name + ".";
+        code += "End" + struct_def.name;
+        code += "(builder);\n  }\n\n";
+      }
+      // Generate a set of static methods that allow table construction,
+      // of the form:
+      // public static void addName(FlatBufferBuilder builder, short name)
+      // { builder.addShort(id, name, default); }
+      // Unlike the Create function, these always work.
+      code += "  public static void Start";
+      code += struct_def.name;
+      code += "(FlatBufferBuilder builder) { builder.";
+      code += "StartTable(";
+      code += NumToString(struct_def.fields.vec.size()) + "); }\n";
+      for (auto it = struct_def.fields.vec.begin();
+           it != struct_def.fields.vec.end(); ++it) {
+        auto &field = **it;
+        if (field.deprecated) continue;
+        if (field.key) key_field = &field;
+        code += "  public static void Add";
+        code += MakeCamel(field.name);
+        code += "(FlatBufferBuilder builder, ";
+        code += GenTypeBasic(field.value.type);
+        auto argname = MakeCamel(field.name, false);
+        if (!IsScalar(field.value.type.base_type)) argname += "Offset";
+        if (field.IsScalarOptional()) { code += "?"; }
+        code += " " + argname + ") { builder.Add";
+        code += GenMethod(field.value.type) + "(";
+        code += NumToString(it - struct_def.fields.vec.begin()) + ", ";
+        code += SourceCastBasic(field.value.type);
+        code += argname;
+        if (!IsScalar(field.value.type.base_type) &&
+            field.value.type.base_type != BASE_TYPE_UNION) {
+          code += ".Value";
+        }
+        if (!field.IsScalarOptional()) {
+          // When the scalar is optional, use the builder method that doesn't
+          // supply a default value. Otherwise, we to continue to use the
+          // default value method.
+          code += ", ";
+          code += GenDefaultValue(field, false);
+        }
+        code += "); }\n";
+        if (IsVector(field.value.type)) {
+          auto vector_type = field.value.type.VectorType();
+          auto alignment = InlineAlignment(vector_type);
+          auto elem_size = InlineSize(vector_type);
+          if (!IsStruct(vector_type)) {
+            field_has_create_set.insert(&field);
+            code += "  public static VectorOffset ";
+            code += "Create";
+            code += MakeCamel(field.name);
+            code += "Vector(FlatBufferBuilder builder, ";
+            code += GenTypeBasic(vector_type) + "[] data) ";
+            code += "{ builder.StartVector(";
+            code += NumToString(elem_size);
+            code += ", data.Length, ";
+            code += NumToString(alignment);
+            code += "); for (int i = data.";
+            code += "Length - 1; i >= 0; i--) builder.";
+            code += "Add";
+            code += GenMethod(vector_type);
+            code += "(";
+            code += SourceCastBasic(vector_type);
+            code += "data[i]";
+            if (vector_type.base_type == BASE_TYPE_STRUCT ||
+                IsString(vector_type))
+              code += ".Value";
+            code += "); return ";
+            code += "builder.EndVector(); }\n";
+
+            code += "  public static VectorOffset ";
+            code += "Create";
+            code += MakeCamel(field.name);
+            code += "VectorBlock(FlatBufferBuilder builder, ";
+            code += GenTypeBasic(vector_type) + "[] data) ";
+            code += "{ builder.StartVector(";
+            code += NumToString(elem_size);
+            code += ", data.Length, ";
+            code += NumToString(alignment);
+            code += "); builder.Add(data); return builder.EndVector(); }\n";
+          }
+          // Generate a method to start a vector, data to be added manually
+          // after.
+          code += "  public static void Start";
+          code += MakeCamel(field.name);
+          code += "Vector(FlatBufferBuilder builder, int numElems) ";
+          code += "{ builder.StartVector(";
+          code += NumToString(elem_size);
+          code += ", numElems, " + NumToString(alignment);
+          code += "); }\n";
+        }
+      }
+      code += "  public static " + GenOffsetType(struct_def) + " ";
+      code += "End" + struct_def.name;
+      code += "(FlatBufferBuilder builder) {\n    int o = builder.";
+      code += "EndTable();\n";
+      for (auto it = struct_def.fields.vec.begin();
+           it != struct_def.fields.vec.end(); ++it) {
+        auto &field = **it;
+        if (!field.deprecated && field.IsRequired()) {
+          code += "    builder.Required(o, ";
+          code += NumToString(field.value.offset);
+          code += ");  // " + field.name + "\n";
+        }
+      }
+      code += "    return " + GenOffsetConstruct(struct_def, "o") + ";\n  }\n";
+      if (parser_.root_struct_def_ == &struct_def) {
+        std::string size_prefix[] = { "", "SizePrefixed" };
+        for (int i = 0; i < 2; ++i) {
+          code += "  public static void ";
+          code += "Finish" + size_prefix[i] + struct_def.name;
+          code +=
+              "Buffer(FlatBufferBuilder builder, " + GenOffsetType(struct_def);
+          code += " offset) {";
+          code += " builder.Finish" + size_prefix[i] + "(offset";
+          code += ".Value";
+
+          if (parser_.file_identifier_.length())
+            code += ", \"" + parser_.file_identifier_ + "\"";
+          code += "); }\n";
+        }
+      }
+    }
+    // Only generate key compare function for table,
+    // because `key_field` is not set for struct
+    if (struct_def.has_key && !struct_def.fixed) {
+      FLATBUFFERS_ASSERT(key_field);
+      code += "\n  public static VectorOffset ";
+      code += "CreateSortedVectorOf" + struct_def.name;
+      code += "(FlatBufferBuilder builder, ";
+      code += "Offset<" + struct_def.name + ">";
+      code += "[] offsets) {\n";
+      code += "    Array.Sort(offsets, (Offset<" + struct_def.name +
+              "> o1, Offset<" + struct_def.name + "> o2) => " +
+              GenKeyGetter(key_field);
+      code += ");\n";
+      code += "    return builder.CreateVectorOfTables(offsets);\n  }\n";
+
+      code += "\n  public static " + struct_def.name + "?";
+      code += " __lookup_by_key(";
+      code += "int vectorLocation, ";
+      code += GenTypeGet(key_field->value.type);
+      code += " key, ByteBuffer bb) {\n";
+      if (IsString(key_field->value.type)) {
+        code += "    byte[] byteKey = ";
+        code += "System.Text.Encoding.UTF8.GetBytes(key);\n";
+      }
+      code += "    int span = ";
+      code += "bb.GetInt(vectorLocation - 4);\n";
+      code += "    int start = 0;\n";
+      code += "    while (span != 0) {\n";
+      code += "      int middle = span / 2;\n";
+      code += GenLookupKeyGetter(key_field);
+      code += "      if (comp > 0) {\n";
+      code += "        span = middle;\n";
+      code += "      } else if (comp < 0) {\n";
+      code += "        middle++;\n";
+      code += "        start += middle;\n";
+      code += "        span -= middle;\n";
+      code += "      } else {\n";
+      code += "        return ";
+      code += "new " + struct_def.name + "()";
+      code += ".__assign(tableOffset, bb);\n";
+      code += "      }\n    }\n";
+      code += "    return null;\n";
+      code += "  }\n";
+    }
+
+    if (opts.generate_object_based_api) {
+      GenPackUnPack_ObjectAPI(struct_def, code_ptr, opts, struct_has_create,
+                              field_has_create_set);
+    }
+    code += "};\n\n";
+
+    if (opts.generate_object_based_api) {
+      GenStruct_ObjectAPI(struct_def, code_ptr, opts);
+    }
+  }
+
+  void GenVectorAccessObject(StructDef &struct_def,
+                             std::string *code_ptr) const {
+    auto &code = *code_ptr;
+    // Generate a vector of structs accessor class.
+    code += "\n";
+    code += "  ";
+    if (!struct_def.attributes.Lookup("private")) code += "public ";
+    code += "static struct Vector : BaseVector\n{\n";
+
+    // Generate the __assign method that sets the field in a pre-existing
+    // accessor object. This is to allow object reuse.
+    std::string method_indent = "    ";
+    code += method_indent + "public Vector ";
+    code += "__assign(int _vector, int _element_size, ByteBuffer _bb) { ";
+    code += "__reset(_vector, _element_size, _bb); return this; }\n\n";
+
+    auto type_name = struct_def.name;
+    auto method_start = method_indent + "public " + type_name + " Get";
+    // Generate the accessors that don't do object reuse.
+    code += method_start + "(int j) { return Get";
+    code += "(new " + type_name + "(), j); }\n";
+    code += method_start + "(" + type_name + " obj, int j) { ";
+    code += " return obj.__assign(";
+    code += struct_def.fixed ? "__p.__element(j)"
+                             : "__p.__indirect(__p.__element(j), bb)";
+    code += ", __p.bb); }\n";
+    // See if we should generate a by-key accessor.
+    if (!struct_def.fixed) {
+      auto &fields = struct_def.fields.vec;
+      for (auto kit = fields.begin(); kit != fields.end(); ++kit) {
+        auto &key_field = **kit;
+        if (key_field.key) {
+          auto nullable_annotation =
+              parser_.opts.gen_nullable ? "@Nullable " : "";
+          code += method_indent + nullable_annotation;
+          code += "public " + type_name + "? ";
+          code += "GetByKey(";
+          code += GenTypeGet(key_field.value.type) + " key) { ";
+          code += " return __lookup_by_key(null, ";
+          code += "__p.__vector(), key, ";
+          code += "__p.bb); ";
+          code += "}\n";
+          code += method_indent + nullable_annotation;
+          code += "public " + type_name + "?" + " ";
+          code += "GetByKey(";
+          code += type_name + "? obj, ";
+          code += GenTypeGet(key_field.value.type) + " key) { ";
+          code += " return __lookup_by_key(obj, ";
+          code += "__p.__vector(), key, ";
+          code += "__p.bb); ";
+          code += "}\n";
+          break;
+        }
+      }
+    }
+    code += "  }\n";
+  }
+
+  void GenEnum_ObjectAPI(EnumDef &enum_def, std::string *code_ptr,
+                         const IDLOptions &opts) const {
+    auto &code = *code_ptr;
+    if (enum_def.generated) return;
+    if (!enum_def.is_union) return;
+    if (enum_def.attributes.Lookup("private")) {
+      code += "internal ";
+    } else {
+      code += "public ";
+    }
+    auto union_name = enum_def.name + "Union";
+    code += "class " + union_name + " {\n";
+    // Type
+    code += "  public " + enum_def.name + " Type { get; set; }\n";
+    // Value
+    code += "  public object Value { get; set; }\n";
+    code += "\n";
+    // Constructor
+    code += "  public " + union_name + "() {\n";
+    code += "    this.Type = " + enum_def.name + "." +
+            enum_def.Vals()[0]->name + ";\n";
+    code += "    this.Value = null;\n";
+    code += "  }\n\n";
+    // As<T>
+    code += "  public T As<T>() where T : class { return this.Value as T; }\n";
+    // As
+    for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
+      auto &ev = **it;
+      if (ev.union_type.base_type == BASE_TYPE_NONE) continue;
+      auto type_name = GenTypeGet_ObjectAPI(ev.union_type, opts);
+      if (ev.union_type.base_type == BASE_TYPE_STRUCT &&
+          ev.union_type.struct_def->attributes.Lookup("private")) {
+        code += "  internal ";
+      } else {
+        code += "  public ";
+      }
+      code += type_name + " As" + ev.name + "() { return this.As<" + type_name +
+              ">(); }\n";
+    }
+    code += "\n";
+    // Pack()
+    code += "  public static int Pack(FlatBuffers.FlatBufferBuilder builder, " +
+            union_name + " _o) {\n";
+    code += "    switch (_o.Type) {\n";
+    for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
+      auto &ev = **it;
+      if (ev.union_type.base_type == BASE_TYPE_NONE) {
+        code += "      default: return 0;\n";
+      } else {
+        code += "      case " + enum_def.name + "." + ev.name + ": return ";
+        if (IsString(ev.union_type)) {
+          code += "builder.CreateString(_o.As" + ev.name + "()).Value;\n";
+        } else {
+          code += GenTypeGet(ev.union_type) + ".Pack(builder, _o.As" + ev.name +
+                  "()).Value;\n";
+        }
+      }
+    }
+    code += "    }\n";
+    code += "  }\n";
+    code += "}\n\n";
+    // JsonConverter
+    if (opts.cs_gen_json_serializer) {
+      if (enum_def.attributes.Lookup("private")) {
+        code += "internal ";
+      } else {
+        code += "public ";
+      }
+      code += "class " + union_name +
+              "_JsonConverter : Newtonsoft.Json.JsonConverter {\n";
+      code += "  public override bool CanConvert(System.Type objectType) {\n";
+      code += "    return objectType == typeof(" + union_name +
+              ") || objectType == typeof(System.Collections.Generic.List<" +
+              union_name + ">);\n";
+      code += "  }\n";
+      code +=
+          "  public override void WriteJson(Newtonsoft.Json.JsonWriter writer, "
+          "object value, "
+          "Newtonsoft.Json.JsonSerializer serializer) {\n";
+      code += "    var _olist = value as System.Collections.Generic.List<" +
+              union_name + ">;\n";
+      code += "    if (_olist != null) {\n";
+      code += "      writer.WriteStartArray();\n";
+      code +=
+          "      foreach (var _o in _olist) { this.WriteJson(writer, _o, "
+          "serializer); }\n";
+      code += "      writer.WriteEndArray();\n";
+      code += "    } else {\n";
+      code += "      this.WriteJson(writer, value as " + union_name +
+              ", serializer);\n";
+      code += "    }\n";
+      code += "  }\n";
+      code += "  public void WriteJson(Newtonsoft.Json.JsonWriter writer, " +
+              union_name +
+              " _o, "
+              "Newtonsoft.Json.JsonSerializer serializer) {\n";
+      code += "    if (_o == null) return;\n";
+      code += "    serializer.Serialize(writer, _o.Value);\n";
+      code += "  }\n";
+      code +=
+          "  public override object ReadJson(Newtonsoft.Json.JsonReader "
+          "reader, "
+          "System.Type objectType, "
+          "object existingValue, Newtonsoft.Json.JsonSerializer serializer) "
+          "{\n";
+      code +=
+          "    var _olist = existingValue as System.Collections.Generic.List<" +
+          union_name + ">;\n";
+      code += "    if (_olist != null) {\n";
+      code += "      for (var _j = 0; _j < _olist.Count; ++_j) {\n";
+      code += "        reader.Read();\n";
+      code +=
+          "        _olist[_j] = this.ReadJson(reader, _olist[_j], "
+          "serializer);\n";
+      code += "      }\n";
+      code += "      reader.Read();\n";
+      code += "      return _olist;\n";
+      code += "    } else {\n";
+      code += "      return this.ReadJson(reader, existingValue as " +
+              union_name + ", serializer);\n";
+      code += "    }\n";
+      code += "  }\n";
+      code += "  public " + union_name +
+              " ReadJson(Newtonsoft.Json.JsonReader reader, " + union_name +
+              " _o, Newtonsoft.Json.JsonSerializer serializer) {\n";
+      code += "    if (_o == null) return null;\n";
+      code += "    switch (_o.Type) {\n";
+      for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end();
+           ++it) {
+        auto &ev = **it;
+        if (ev.union_type.base_type == BASE_TYPE_NONE) {
+          code += "      default: break;\n";
+        } else {
+          auto type_name = GenTypeGet_ObjectAPI(ev.union_type, opts);
+          code += "      case " + enum_def.name + "." + ev.name +
+                  ": _o.Value = serializer.Deserialize<" + type_name +
+                  ">(reader); break;\n";
+        }
+      }
+      code += "    }\n";
+      code += "    return _o;\n";
+      code += "  }\n";
+      code += "}\n\n";
+    }
+  }
+
+  std::string GenTypeName_ObjectAPI(const std::string &name,
+                                    const IDLOptions &opts) const {
+    return opts.object_prefix + name + opts.object_suffix;
+  }
+
+  void GenUnionUnPack_ObjectAPI(const EnumDef &enum_def, std::string *code_ptr,
+                                const std::string &camel_name,
+                                bool is_vector) const {
+    auto &code = *code_ptr;
+    std::string varialbe_name = "_o." + camel_name;
+    std::string type_suffix = "";
+    std::string func_suffix = "()";
+    std::string indent = "    ";
+    if (is_vector) {
+      varialbe_name = "_o_" + camel_name;
+      type_suffix = "(_j)";
+      func_suffix = "(_j)";
+      indent = "      ";
+    }
+    if (is_vector) {
+      code += indent + "var " + varialbe_name + " = new ";
+    } else {
+      code += indent + varialbe_name + " = new ";
+    }
+    code += WrapInNameSpace(enum_def) + "Union();\n";
+    code += indent + varialbe_name + ".Type = this." + camel_name + "Type" +
+            type_suffix + ";\n";
+    code +=
+        indent + "switch (this." + camel_name + "Type" + type_suffix + ") {\n";
+    for (auto eit = enum_def.Vals().begin(); eit != enum_def.Vals().end();
+         ++eit) {
+      auto &ev = **eit;
+      if (ev.union_type.base_type == BASE_TYPE_NONE) {
+        code += indent + "  default: break;\n";
+      } else {
+        code += indent + "  case " + WrapInNameSpace(enum_def) + "." + ev.name +
+                ":\n";
+        code += indent + "    " + varialbe_name + ".Value = this." + camel_name;
+        if (IsString(ev.union_type)) {
+          code += "AsString" + func_suffix + ";\n";
+        } else {
+          code += "<" + GenTypeGet(ev.union_type) + ">" + func_suffix;
+          code += ".HasValue ? this." + camel_name;
+          code += "<" + GenTypeGet(ev.union_type) + ">" + func_suffix +
+                  ".Value.UnPack() : null;\n";
+        }
+        code += indent + "    break;\n";
+      }
+    }
+    code += indent + "}\n";
+    if (is_vector) {
+      code += indent + "_o." + camel_name + ".Add(" + varialbe_name + ");\n";
+    }
+  }
+
+  void GenPackUnPack_ObjectAPI(
+      StructDef &struct_def, std::string *code_ptr, const IDLOptions &opts,
+      bool struct_has_create,
+      const std::set<FieldDef *> &field_has_create) const {
+    auto &code = *code_ptr;
+    auto struct_name = GenTypeName_ObjectAPI(struct_def.name, opts);
+    // UnPack()
+    code += "  public " + struct_name + " UnPack() {\n";
+    code += "    var _o = new " + struct_name + "();\n";
+    code += "    this.UnPackTo(_o);\n";
+    code += "    return _o;\n";
+    code += "  }\n";
+    // UnPackTo()
+    code += "  public void UnPackTo(" + struct_name + " _o) {\n";
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      if (field.deprecated) continue;
+      auto camel_name = MakeCamel(field.name);
+      auto start = "    _o." + camel_name + " = ";
+      switch (field.value.type.base_type) {
+        case BASE_TYPE_STRUCT: {
+          auto fixed = struct_def.fixed && field.value.type.struct_def->fixed;
+          if (fixed) {
+            code += start + "this." + camel_name + ".UnPack();\n";
+          } else {
+            code += start + "this." + camel_name + ".HasValue ? this." +
+                    camel_name + ".Value.UnPack() : null;\n";
+          }
+          break;
+        }
+        case BASE_TYPE_ARRAY: {
+          auto type_name = GenTypeGet_ObjectAPI(field.value.type, opts);
+          auto length_str = NumToString(field.value.type.fixed_length);
+          auto unpack_method = field.value.type.struct_def == nullptr
+                                   ? ""
+                                   : field.value.type.struct_def->fixed
+                                         ? ".UnPack()"
+                                         : "?.UnPack()";
+          code += start + "new " + type_name.substr(0, type_name.length() - 1) +
+                  length_str + "];\n";
+          code += "    for (var _j = 0; _j < " + length_str + "; ++_j) { _o." +
+                  camel_name + "[_j] = this." + camel_name + "(_j)" +
+                  unpack_method + "; }\n";
+          break;
+        }
+        case BASE_TYPE_VECTOR:
+          if (field.value.type.element == BASE_TYPE_UNION) {
+            code += start + "new " +
+                    GenTypeGet_ObjectAPI(field.value.type, opts) + "();\n";
+            code += "    for (var _j = 0; _j < this." + camel_name +
+                    "Length; ++_j) {\n";
+            GenUnionUnPack_ObjectAPI(*field.value.type.enum_def, code_ptr,
+                                     camel_name, true);
+            code += "    }\n";
+          } else if (field.value.type.element != BASE_TYPE_UTYPE) {
+            auto fixed = field.value.type.struct_def == nullptr;
+            code += start + "new " +
+                    GenTypeGet_ObjectAPI(field.value.type, opts) + "();\n";
+            code += "    for (var _j = 0; _j < this." + camel_name +
+                    "Length; ++_j) {";
+            code += "_o." + camel_name + ".Add(";
+            if (fixed) {
+              code += "this." + camel_name + "(_j)";
+            } else {
+              code += "this." + camel_name + "(_j).HasValue ? this." +
+                      camel_name + "(_j).Value.UnPack() : null";
+            }
+            code += ");}\n";
+          }
+          break;
+        case BASE_TYPE_UTYPE: break;
+        case BASE_TYPE_UNION: {
+          GenUnionUnPack_ObjectAPI(*field.value.type.enum_def, code_ptr,
+                                   camel_name, false);
+          break;
+        }
+        default: {
+          code += start + "this." + camel_name + ";\n";
+          break;
+        }
+      }
+    }
+    code += "  }\n";
+    // Pack()
+    code += "  public static " + GenOffsetType(struct_def) +
+            " Pack(FlatBufferBuilder builder, " + struct_name + " _o) {\n";
+    code += "    if (_o == null) return default(" + GenOffsetType(struct_def) +
+            ");\n";
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      if (field.deprecated) continue;
+      auto camel_name = MakeCamel(field.name);
+      // pre
+      switch (field.value.type.base_type) {
+        case BASE_TYPE_STRUCT: {
+          if (!field.value.type.struct_def->fixed) {
+            code += "    var _" + field.name + " = _o." + camel_name +
+                    " == null ? default(" +
+                    GenOffsetType(*field.value.type.struct_def) +
+                    ") : " + GenTypeGet(field.value.type) +
+                    ".Pack(builder, _o." + camel_name + ");\n";
+          } else if (struct_def.fixed && struct_has_create) {
+            std::vector<FieldArrayLength> array_lengths;
+            FieldArrayLength tmp_array_length = {
+              field.name,
+              field.value.type.fixed_length,
+            };
+            array_lengths.push_back(tmp_array_length);
+            GenStructPackDecl_ObjectAPI(*field.value.type.struct_def, code_ptr,
+                                        array_lengths);
+          }
+          break;
+        }
+        case BASE_TYPE_STRING: {
+          std::string create_string =
+              field.shared ? "CreateSharedString" : "CreateString";
+          code += "    var _" + field.name + " = _o." + camel_name +
+                  " == null ? default(StringOffset) : "
+                  "builder." +
+                  create_string + "(_o." + camel_name + ");\n";
+          break;
+        }
+        case BASE_TYPE_VECTOR: {
+          if (field_has_create.find(&field) != field_has_create.end()) {
+            auto property_name = camel_name;
+            auto gen_for_loop = true;
+            std::string array_name = "__" + field.name;
+            std::string array_type = "";
+            std::string to_array = "";
+            switch (field.value.type.element) {
+              case BASE_TYPE_STRING: {
+                std::string create_string =
+                    field.shared ? "CreateSharedString" : "CreateString";
+                array_type = "StringOffset";
+                to_array += "builder." + create_string + "(_o." +
+                            property_name + "[_j])";
+                break;
+              }
+              case BASE_TYPE_STRUCT:
+                array_type = "Offset<" + GenTypeGet(field.value.type) + ">";
+                to_array = GenTypeGet(field.value.type) + ".Pack(builder, _o." +
+                           property_name + "[_j])";
+                break;
+              case BASE_TYPE_UTYPE:
+                property_name = camel_name.substr(0, camel_name.size() - 4);
+                array_type = WrapInNameSpace(*field.value.type.enum_def);
+                to_array = "_o." + property_name + "[_j].Type";
+                break;
+              case BASE_TYPE_UNION:
+                array_type = "int";
+                to_array = WrapInNameSpace(*field.value.type.enum_def) +
+                           "Union.Pack(builder,  _o." + property_name + "[_j])";
+                break;
+              default: gen_for_loop = false; break;
+            }
+            code += "    var _" + field.name + " = default(VectorOffset);\n";
+            code += "    if (_o." + property_name + " != null) {\n";
+            if (gen_for_loop) {
+              code += "      var " + array_name + " = new " + array_type +
+                      "[_o." + property_name + ".Count];\n";
+              code += "      for (var _j = 0; _j < " + array_name +
+                      ".Length; ++_j) { ";
+              code += array_name + "[_j] = " + to_array + "; }\n";
+            } else {
+              code += "      var " + array_name + " = _o." + property_name +
+                      ".ToArray();\n";
+            }
+            code += "      _" + field.name + " = Create" + camel_name +
+                    "Vector(builder, " + array_name + ");\n";
+            code += "    }\n";
+          } else {
+            auto pack_method =
+                field.value.type.struct_def == nullptr
+                    ? "builder.Add" + GenMethod(field.value.type.VectorType()) +
+                          "(_o." + camel_name + "[_j]);"
+                    : GenTypeGet(field.value.type) + ".Pack(builder, _o." +
+                          camel_name + "[_j]);";
+            code += "    var _" + field.name + " = default(VectorOffset);\n";
+            code += "    if (_o." + camel_name + " != null) {\n";
+            code += "      Start" + camel_name + "Vector(builder, _o." +
+                    camel_name + ".Count);\n";
+            code += "      for (var _j = _o." + camel_name +
+                    ".Count - 1; _j >= 0; --_j) { " + pack_method + " }\n";
+            code += "      _" + field.name + " = builder.EndVector();\n";
+            code += "    }\n";
+          }
+          break;
+        }
+        case BASE_TYPE_ARRAY: {
+          if (field.value.type.struct_def != nullptr) {
+            std::vector<FieldArrayLength> array_lengths;
+            FieldArrayLength tmp_array_length = {
+              field.name,
+              field.value.type.fixed_length,
+            };
+            array_lengths.push_back(tmp_array_length);
+            GenStructPackDecl_ObjectAPI(*field.value.type.struct_def, code_ptr,
+                                        array_lengths);
+          } else {
+            code += "    var _" + field.name + " = _o." + camel_name + ";\n";
+          }
+          break;
+        }
+        case BASE_TYPE_UNION: {
+          code += "    var _" + field.name + "_type = _o." + camel_name +
+                  " == null ? " + WrapInNameSpace(*field.value.type.enum_def) +
+                  ".NONE : " + "_o." + camel_name + ".Type;\n";
+          code +=
+              "    var _" + field.name + " = _o." + camel_name +
+              " == null ? 0 : " + GenTypeGet_ObjectAPI(field.value.type, opts) +
+              ".Pack(builder, _o." + camel_name + ");\n";
+          break;
+        }
+        default: break;
+      }
+    }
+    if (struct_has_create) {
+      // Create
+      code += "    return Create" + struct_def.name + "(\n";
+      code += "      builder";
+      for (auto it = struct_def.fields.vec.begin();
+           it != struct_def.fields.vec.end(); ++it) {
+        auto &field = **it;
+        if (field.deprecated) continue;
+        auto camel_name = MakeCamel(field.name);
+        switch (field.value.type.base_type) {
+          case BASE_TYPE_STRUCT: {
+            if (struct_def.fixed) {
+              GenStructPackCall_ObjectAPI(*field.value.type.struct_def,
+                                          code_ptr,
+                                          "      _" + field.name + "_");
+            } else {
+              code += ",\n";
+              if (field.value.type.struct_def->fixed) {
+                if (opts.generate_object_based_api)
+                  code += "      _o." + camel_name;
+                else
+                  code += "      " + GenTypeGet(field.value.type) +
+                          ".Pack(builder, _o." + camel_name + ")";
+              } else {
+                code += "      _" + field.name;
+              }
+            }
+            break;
+          }
+          case BASE_TYPE_ARRAY: {
+            if (field.value.type.struct_def != nullptr) {
+              GenStructPackCall_ObjectAPI(*field.value.type.struct_def,
+                                          code_ptr,
+                                          "      _" + field.name + "_");
+            } else {
+              code += ",\n";
+              code += "      _" + field.name;
+            }
+            break;
+          }
+          case BASE_TYPE_UNION: FLATBUFFERS_FALLTHROUGH();   // fall thru
+          case BASE_TYPE_UTYPE: FLATBUFFERS_FALLTHROUGH();   // fall thru
+          case BASE_TYPE_STRING: FLATBUFFERS_FALLTHROUGH();  // fall thru
+          case BASE_TYPE_VECTOR: {
+            code += ",\n";
+            code += "      _" + field.name;
+            break;
+          }
+          default:  // scalar
+            code += ",\n";
+            code += "      _o." + camel_name;
+            break;
+        }
+      }
+      code += ");\n";
+    } else {
+      // Start, End
+      code += "    Start" + struct_def.name + "(builder);\n";
+      for (auto it = struct_def.fields.vec.begin();
+           it != struct_def.fields.vec.end(); ++it) {
+        auto &field = **it;
+        if (field.deprecated) continue;
+        auto camel_name = MakeCamel(field.name);
+        switch (field.value.type.base_type) {
+          case BASE_TYPE_STRUCT: {
+            if (field.value.type.struct_def->fixed) {
+              code += "    Add" + camel_name + "(builder, " +
+                      GenTypeGet(field.value.type) + ".Pack(builder, _o." +
+                      camel_name + "));\n";
+            } else {
+              code +=
+                  "    Add" + camel_name + "(builder, _" + field.name + ");\n";
+            }
+            break;
+          }
+          case BASE_TYPE_STRING: FLATBUFFERS_FALLTHROUGH();  // fall thru
+          case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH();   // fall thru
+          case BASE_TYPE_VECTOR: {
+            code +=
+                "    Add" + camel_name + "(builder, _" + field.name + ");\n";
+            break;
+          }
+          case BASE_TYPE_UTYPE: break;
+          case BASE_TYPE_UNION: {
+            code += "    Add" + camel_name + "Type(builder, _" + field.name +
+                    "_type);\n";
+            code +=
+                "    Add" + camel_name + "(builder, _" + field.name + ");\n";
+            break;
+          }
+          // scalar
+          default: {
+            code +=
+                "    Add" + camel_name + "(builder, _o." + camel_name + ");\n";
+            break;
+          }
+        }
+      }
+      code += "    return End" + struct_def.name + "(builder);\n";
+    }
+    code += "  }\n";
+  }
+
+  void GenStructPackDecl_ObjectAPI(
+      const StructDef &struct_def, std::string *code_ptr,
+      std::vector<FieldArrayLength> &array_lengths) const {
+    auto &code = *code_ptr;
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      auto is_array = IsArray(field.value.type);
+      const auto &field_type =
+          is_array ? field.value.type.VectorType() : field.value.type;
+      FieldArrayLength tmp_array_length = {
+        field.name,
+        field_type.fixed_length,
+      };
+      array_lengths.push_back(tmp_array_length);
+      if (field_type.struct_def != nullptr) {
+        GenStructPackDecl_ObjectAPI(*field_type.struct_def, code_ptr,
+                                    array_lengths);
+      } else {
+        std::vector<FieldArrayLength> array_only_lengths;
+        for (size_t i = 0; i < array_lengths.size(); ++i) {
+          if (array_lengths[i].length > 0) {
+            array_only_lengths.push_back(array_lengths[i]);
+          }
+        }
+        std::string name;
+        for (size_t i = 0; i < array_lengths.size(); ++i) {
+          name += "_" + array_lengths[i].name;
+        }
+        code += "    var " + name + " = ";
+        if (array_only_lengths.size() > 0) {
+          code += "new " + GenTypeBasic(field_type) + "[";
+          for (size_t i = 0; i < array_only_lengths.size(); ++i) {
+            if (i != 0) { code += ","; }
+            code += NumToString(array_only_lengths[i].length);
+          }
+          code += "];\n";
+          code += "    ";
+          // initialize array
+          for (size_t i = 0; i < array_only_lengths.size(); ++i) {
+            auto idx = "idx" + NumToString(i);
+            code += "for (var " + idx + " = 0; " + idx + " < " +
+                    NumToString(array_only_lengths[i].length) + "; ++" + idx +
+                    ") {";
+          }
+          for (size_t i = 0; i < array_only_lengths.size(); ++i) {
+            auto idx = "idx" + NumToString(i);
+            if (i == 0) {
+              code += name + "[" + idx;
+            } else {
+              code += "," + idx;
+            }
+          }
+          code += "] = _o";
+          for (size_t i = 0, j = 0; i < array_lengths.size(); ++i) {
+            code += "." + MakeCamel(array_lengths[i].name);
+            if (array_lengths[i].length <= 0) continue;
+            code += "[idx" + NumToString(j++) + "]";
+          }
+          code += ";";
+          for (size_t i = 0; i < array_only_lengths.size(); ++i) {
+            code += "}";
+          }
+        } else {
+          code += "_o";
+          for (size_t i = 0; i < array_lengths.size(); ++i) {
+            code += "." + MakeCamel(array_lengths[i].name);
+          }
+          code += ";";
+        }
+        code += "\n";
+      }
+      array_lengths.pop_back();
+    }
+  }
+
+  void GenStructPackCall_ObjectAPI(const StructDef &struct_def,
+                                   std::string *code_ptr,
+                                   std::string prefix) const {
+    auto &code = *code_ptr;
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      const auto &field_type = field.value.type;
+      if (field_type.struct_def != nullptr) {
+        GenStructPackCall_ObjectAPI(*field_type.struct_def, code_ptr,
+                                    prefix + field.name + "_");
+      } else {
+        code += ",\n";
+        code += prefix + field.name;
+      }
+    }
+  }
+
+  std::string GenTypeGet_ObjectAPI(flatbuffers::Type type,
+                                   const IDLOptions &opts) const {
+    auto type_name = GenTypeGet(type);
+    // Replace to ObjectBaseAPI Type Name
+    switch (type.base_type) {
+      case BASE_TYPE_STRUCT: FLATBUFFERS_FALLTHROUGH();  // fall thru
+      case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH();   // fall thru
+      case BASE_TYPE_VECTOR: {
+        if (type.struct_def != nullptr) {
+          auto type_name_length = type.struct_def->name.length();
+          auto new_type_name =
+              GenTypeName_ObjectAPI(type.struct_def->name, opts);
+          type_name.replace(type_name.length() - type_name_length,
+                            type_name_length, new_type_name);
+        } else if (type.element == BASE_TYPE_UNION) {
+          type_name = WrapInNameSpace(*type.enum_def) + "Union";
+        }
+        break;
+      }
+
+      case BASE_TYPE_UNION: {
+        type_name = WrapInNameSpace(*type.enum_def) + "Union";
+        break;
+      }
+      default: break;
+    }
+
+    switch (type.base_type) {
+      case BASE_TYPE_ARRAY: {
+        type_name = type_name + "[]";
+        break;
+      }
+      case BASE_TYPE_VECTOR: {
+        type_name = "List<" + type_name + ">";
+        break;
+      }
+      default: break;
+    }
+    return type_name;
+  }
+
+  void GenStruct_ObjectAPI(StructDef &struct_def, std::string *code_ptr,
+                           const IDLOptions &opts) const {
+    auto &code = *code_ptr;
+    if (struct_def.attributes.Lookup("private")) {
+      code += "internal ";
+    } else {
+      code += "public ";
+    }
+    if (struct_def.attributes.Lookup("csharp_partial")) {
+      // generate a partial class for this C# struct/table
+      code += "partial ";
+    }
+    auto class_name = GenTypeName_ObjectAPI(struct_def.name, opts);
+    code += "class " + class_name;
+    code += "\n{\n";
+    // Generate Properties
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      if (field.deprecated) continue;
+      if (field.value.type.base_type == BASE_TYPE_UTYPE) continue;
+      if (field.value.type.element == BASE_TYPE_UTYPE) continue;
+      auto type_name = GenTypeGet_ObjectAPI(field.value.type, opts);
+      if (field.IsScalarOptional()) type_name += "?";
+      auto camel_name = MakeCamel(field.name, true);
+      if (opts.cs_gen_json_serializer) {
+        if (IsUnion(field.value.type)) {
+          auto utype_name = WrapInNameSpace(*field.value.type.enum_def);
+          code +=
+              "  [Newtonsoft.Json.JsonProperty(\"" + field.name + "_type\")]\n";
+          if (IsVector(field.value.type)) {
+            code += "  private " + utype_name + "[] " + camel_name + "Type {\n";
+            code += "    get {\n";
+            code += "      if (this." + camel_name + " == null) return null;\n";
+            code += "      var _o = new " + utype_name + "[this." + camel_name +
+                    ".Count];\n";
+            code +=
+                "      for (var _j = 0; _j < _o.Length; ++_j) { _o[_j] = "
+                "this." +
+                camel_name + "[_j].Type; }\n";
+            code += "      return _o;\n";
+            code += "    }\n";
+            code += "    set {\n";
+            code += "      this." + camel_name + " = new List<" + utype_name +
+                    "Union>();\n";
+            code += "      for (var _j = 0; _j < value.Length; ++_j) {\n";
+            code += "        var _o = new " + utype_name + "Union();\n";
+            code += "        _o.Type = value[_j];\n";
+            code += "        this." + camel_name + ".Add(_o);\n";
+            code += "      }\n";
+            code += "    }\n";
+            code += "  }\n";
+          } else {
+            code += "  private " + utype_name + " " + camel_name + "Type {\n";
+            code += "    get {\n";
+            code += "      return this." + camel_name + " != null ? this." +
+                    camel_name + ".Type : " + utype_name + ".NONE;\n";
+            code += "    }\n";
+            code += "    set {\n";
+            code += "      this." + camel_name + " = new " + utype_name +
+                    "Union();\n";
+            code += "      this." + camel_name + ".Type = value;\n";
+            code += "    }\n";
+            code += "  }\n";
+          }
+        }
+        code += "  [Newtonsoft.Json.JsonProperty(\"" + field.name + "\")]\n";
+        if (IsUnion(field.value.type)) {
+          auto union_name =
+              (IsVector(field.value.type))
+                  ? GenTypeGet_ObjectAPI(field.value.type.VectorType(), opts)
+                  : type_name;
+          code += "  [Newtonsoft.Json.JsonConverter(typeof(" + union_name +
+                  "_JsonConverter))]\n";
+        }
+        if (field.attributes.Lookup("hash")) {
+          code += "  [Newtonsoft.Json.JsonIgnore()]\n";
+        }
+      }
+      code += "  public " + type_name + " " + camel_name + " { get; set; }\n";
+    }
+    // Generate Constructor
+    code += "\n";
+    code += "  public " + class_name + "() {\n";
+    for (auto it = struct_def.fields.vec.begin();
+         it != struct_def.fields.vec.end(); ++it) {
+      auto &field = **it;
+      if (field.deprecated) continue;
+      if (field.value.type.base_type == BASE_TYPE_UTYPE) continue;
+      if (field.value.type.element == BASE_TYPE_UTYPE) continue;
+      code += "    this." + MakeCamel(field.name) + " = ";
+      auto type_name = GenTypeGet_ObjectAPI(field.value.type, opts);
+      if (IsScalar(field.value.type.base_type)) {
+        code += GenDefaultValue(field) + ";\n";
+      } else {
+        switch (field.value.type.base_type) {
+          case BASE_TYPE_STRUCT: {
+            if (IsStruct(field.value.type)) {
+              code += "new " + type_name + "();\n";
+            } else {
+              code += "null;\n";
+            }
+            break;
+          }
+          case BASE_TYPE_ARRAY: {
+            code += "new " + type_name.substr(0, type_name.length() - 1) +
+                    NumToString(field.value.type.fixed_length) + "];\n";
+            break;
+          }
+          default: {
+            code += "null;\n";
+            break;
+          }
+        }
+      }
+    }
+    code += "  }\n";
+    // Generate Serialization
+    if (opts.cs_gen_json_serializer &&
+        parser_.root_struct_def_ == &struct_def) {
+      code += "\n";
+      code += "  public static " + class_name +
+              " DeserializeFromJson(string jsonText) {\n";
+      code += "    return Newtonsoft.Json.JsonConvert.DeserializeObject<" +
+              class_name + ">(jsonText);\n";
+      code += "  }\n";
+      code += "  public string SerializeToJson() {\n";
+      code +=
+          "    return Newtonsoft.Json.JsonConvert.SerializeObject(this, "
+          "Newtonsoft.Json.Formatting.Indented);\n";
+      code += "  }\n";
+    }
+    if (parser_.root_struct_def_ == &struct_def) {
+      code += "  public static " + class_name +
+              " DeserializeFromBinary(byte[] fbBuffer) {\n";
+      code += "    return " + struct_def.name + ".GetRootAs" + struct_def.name +
+              "(new ByteBuffer(fbBuffer)).UnPack();\n";
+      code += "  }\n";
+      code += "  public byte[] SerializeToBinary() {\n";
+      code += "    var fbb = new FlatBufferBuilder(0x10000);\n";
+      code += "    " + struct_def.name + ".Finish" + struct_def.name +
+              "Buffer(fbb, " + struct_def.name + ".Pack(fbb, this));\n";
+      code += "    return fbb.DataBuffer.ToSizedArray();\n";
+      code += "  }\n";
+    }
+    code += "}\n\n";
+  }
+
+  // This tracks the current namespace used to determine if a type need to be
+  // prefixed by its namespace
+  const Namespace *cur_name_space_;
+};
+}  // namespace csharp
+
+bool GenerateCSharp(const Parser &parser, const std::string &path,
+                    const std::string &file_name) {
+  csharp::CSharpGenerator generator(parser, path, file_name);
+  return generator.generate();
+}
+
+}  // namespace flatbuffers