1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/*
* 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_Writer_hh__
#define avro_Writer_hh__
#include <array>
#include <boost/noncopyable.hpp>
#include "Config.hh"
#include "buffer/Buffer.hh"
#include "Zigzag.hh"
#include "Types.hh"
#include "Validator.hh"
namespace avro {
/// Class for writing avro data to a stream.
template<class ValidatorType>
class WriterImpl : private boost::noncopyable
{
public:
WriterImpl() {}
explicit WriterImpl(const ValidSchema &schema) :
validator_(schema)
{}
void writeValue(const Null &) {
validator_.checkTypeExpected(AVRO_NULL);
}
void writeValue(bool val) {
validator_.checkTypeExpected(AVRO_BOOL);
int8_t byte = (val != 0);
buffer_.writeTo(byte);
}
void writeValue(int32_t val) {
validator_.checkTypeExpected(AVRO_INT);
std::array<uint8_t, 5> bytes;
size_t size = encodeInt32(val, bytes);
buffer_.writeTo(reinterpret_cast<const char *>(bytes.data()), size);
}
void writeValue(int64_t val) {
validator_.checkTypeExpected(AVRO_LONG);
putLong(val);
}
void writeValue(float val) {
validator_.checkTypeExpected(AVRO_FLOAT);
union {
float f;
int32_t i;
} v;
v.f = val;
buffer_.writeTo(v.i);
}
void writeValue(double val) {
validator_.checkTypeExpected(AVRO_DOUBLE);
union {
double d;
int64_t i;
} v;
v.d = val;
buffer_.writeTo(v.i);
}
void writeValue(const std::string &val) {
validator_.checkTypeExpected(AVRO_STRING);
putBytes(val.c_str(), val.size());
}
void writeBytes(const void *val, size_t size) {
validator_.checkTypeExpected(AVRO_BYTES);
putBytes(val, size);
}
template <size_t N>
void writeFixed(const uint8_t (&val)[N]) {
validator_.checkFixedSizeExpected(N);
buffer_.writeTo(reinterpret_cast<const char *>(val), N);
}
template <size_t N>
void writeFixed(const std::array<uint8_t, N> &val) {
validator_.checkFixedSizeExpected(val.size());
buffer_.writeTo(reinterpret_cast<const char *>(val.data()), val.size());
}
void writeRecord() {
validator_.checkTypeExpected(AVRO_RECORD);
validator_.checkTypeExpected(AVRO_LONG);
validator_.setCount(1);
}
void writeRecordEnd() {
validator_.checkTypeExpected(AVRO_RECORD);
validator_.checkTypeExpected(AVRO_LONG);
validator_.setCount(0);
}
void writeArrayBlock(int64_t size) {
validator_.checkTypeExpected(AVRO_ARRAY);
writeCount(size);
}
void writeArrayEnd() {
writeArrayBlock(0);
}
void writeMapBlock(int64_t size) {
validator_.checkTypeExpected(AVRO_MAP);
writeCount(size);
}
void writeMapEnd() {
writeMapBlock(0);
}
void writeUnion(int64_t choice) {
validator_.checkTypeExpected(AVRO_UNION);
writeCount(choice);
}
void writeEnum(int64_t choice) {
validator_.checkTypeExpected(AVRO_ENUM);
writeCount(choice);
}
InputBuffer buffer() const {
return buffer_;
}
private:
void putLong(int64_t val) {
std::array<uint8_t, 10> bytes;
size_t size = encodeInt64(val, bytes);
buffer_.writeTo(reinterpret_cast<const char *>(bytes.data()), size);
}
void putBytes(const void *val, size_t size) {
putLong(size);
buffer_.writeTo(reinterpret_cast<const char *>(val), size);
}
void writeCount(int64_t count) {
validator_.checkTypeExpected(AVRO_LONG);
validator_.setCount(count);
putLong(count);
}
ValidatorType validator_;
OutputBuffer buffer_;
};
typedef WriterImpl<NullValidator> Writer;
typedef WriterImpl<Validator> ValidatingWriter;
} // namespace avro
#endif
|
