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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* https://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.
*/
#ifndef avro_Node_hh__
#define avro_Node_hh__
#include "Config.hh"
#include <boost/noncopyable.hpp>
#include <cassert>
#include <memory>
#include <utility>
#include "CustomFields.hh"
#include "Exception.hh"
#include "LogicalType.hh"
#include "SchemaResolution.hh"
#include "Types.hh"
namespace avro {
class Node;
class GenericDatum;
using NodePtr = std::shared_ptr<Node>;
class AVRO_DECL Name {
std::string ns_;
std::string simpleName_;
public:
Name() = default;
explicit Name(const std::string &fullname);
Name(std::string simpleName, std::string ns) : ns_(std::move(ns)), simpleName_(std::move(simpleName)) { check(); }
std::string fullname() const;
const std::string &ns() const { return ns_; }
const std::string &simpleName() const { return simpleName_; }
void ns(std::string n) { ns_ = std::move(n); }
void simpleName(std::string n) { simpleName_ = std::move(n); }
void fullname(const std::string &n);
bool operator<(const Name &n) const;
void check() const;
bool operator==(const Name &n) const;
bool operator!=(const Name &n) const { return !((*this) == n); }
void clear() {
ns_.clear();
simpleName_.clear();
}
explicit operator std::string() const {
return fullname();
}
};
inline std::ostream &operator<<(std::ostream &os, const Name &n) {
return os << n.fullname();
}
/// Node is the building block for parse trees. Each node represents an avro
/// type. Compound types have leaf nodes that represent the types they are
/// composed of.
///
/// The user does not use the Node object directly, they interface with Schema
/// objects.
///
/// The Node object uses reference-counted pointers. This is so that schemas
/// may be reused in other schemas, without needing to worry about memory
/// deallocation for nodes that are added to multiple schema parse trees.
///
/// Node has minimal implementation, serving as an abstract base class for
/// different node types.
///
class AVRO_DECL Node : private boost::noncopyable {
public:
explicit Node(Type type) : type_(type),
logicalType_(LogicalType::NONE),
locked_(false) {}
virtual ~Node();
Type type() const {
return type_;
}
LogicalType logicalType() const {
return logicalType_;
}
void setLogicalType(LogicalType logicalType);
void lock() {
locked_ = true;
}
bool locked() const {
return locked_;
}
virtual bool hasName() const = 0;
void setName(const Name &name) {
checkLock();
checkName(name);
doSetName(name);
}
virtual const Name &name() const = 0;
virtual const std::string &getDoc() const = 0;
void setDoc(const std::string &doc) {
checkLock();
doSetDoc(doc);
}
void addLeaf(const NodePtr &newLeaf) {
checkLock();
doAddLeaf(newLeaf);
}
virtual size_t leaves() const = 0;
virtual const NodePtr &leafAt(size_t index) const = 0;
virtual const GenericDatum &defaultValueAt(size_t index) {
throw Exception(boost::format("No default value at: %1%") % index);
}
void addName(const std::string &name) {
checkLock();
checkName(Name(name));
doAddName(name);
}
virtual size_t names() const = 0;
virtual const std::string &nameAt(size_t index) const = 0;
virtual bool nameIndex(const std::string &name, size_t &index) const = 0;
void setFixedSize(size_t size) {
checkLock();
doSetFixedSize(size);
}
virtual size_t fixedSize() const = 0;
void addCustomAttributesForField(const CustomFields& customAttributes) {
checkLock();
doAddCustomAttribute(customAttributes);
}
virtual bool isValid() const = 0;
virtual SchemaResolution resolve(const Node &reader) const = 0;
virtual void printJson(std::ostream &os, size_t depth) const = 0;
virtual void printBasicInfo(std::ostream &os) const = 0;
virtual void setLeafToSymbolic(size_t index, const NodePtr &node) = 0;
// Serialize the default value GenericDatum g for the node contained
// in a record node.
virtual void printDefaultToJson(const GenericDatum &g, std::ostream &os,
size_t depth) const = 0;
protected:
void checkLock() const {
if (locked()) {
throw Exception("Cannot modify locked schema");
}
}
virtual void checkName(const Name &name) const {
name.check();
}
virtual void doSetName(const Name &name) = 0;
virtual void doSetDoc(const std::string &name) = 0;
virtual void doAddLeaf(const NodePtr &newLeaf) = 0;
virtual void doAddName(const std::string &name) = 0;
virtual void doSetFixedSize(size_t size) = 0;
virtual void doAddCustomAttribute(const CustomFields& customFields) = 0;
private:
const Type type_;
LogicalType logicalType_;
bool locked_;
};
} // namespace avro
namespace std {
inline std::ostream &operator<<(std::ostream &os, const avro::Node &n) {
n.printJson(os, 0);
return os;
}
} // namespace std
#endif
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