1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements.  See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership.  The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License.  You may obtain a copy of the License at
9  *
10  *     https://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 #ifndef avro_AvroParse_hh__
20 #define avro_AvroParse_hh__
21 
22 #include "AvroTraits.hh"
23 #include "Config.hh"
24 #include "ResolvingReader.hh"
25 
26 /// \file
27 ///
28 /// Standalone parse functions for Avro types.
29 
30 namespace avro {
31 
32 /// The main parse entry point function.  Takes a parser (either validating or
33 /// plain) and the object that should receive the parsed data.
34 
35 template<typename Reader, typename T>
parse(Reader & p,T & val)36 void parse(Reader &p, T &val) {
37     parse(p, val, is_serializable<T>());
38 }
39 
40 template<typename T>
parse(ResolvingReader & p,T & val)41 void parse(ResolvingReader &p, T &val) {
42     translatingParse(p, val, is_serializable<T>());
43 }
44 
45 /// Type trait should be set to is_serializable in otherwise force the compiler to complain.
46 
47 template<typename Reader, typename T>
parse(Reader & p,T & val,const std::false_type &)48 void parse(Reader &p, T &val, const std::false_type &) {
49     static_assert(sizeof(T) == 0, "Not a valid type to parse");
50 }
51 
52 template<typename Reader, typename T>
translatingParse(Reader & p,T & val,const std::false_type &)53 void translatingParse(Reader &p, T &val, const std::false_type &) {
54     static_assert(sizeof(T) == 0, "Not a valid type to parse");
55 }
56 
57 // @{
58 
59 /// The remainder of the file includes default implementations for serializable types.
60 
61 template<typename Reader, typename T>
parse(Reader & p,T & val,const std::true_type &)62 void parse(Reader &p, T &val, const std::true_type &) {
63     p.readValue(val);
64 }
65 
66 template<typename Reader>
parse(Reader & p,std::vector<uint8_t> & val,const std::true_type &)67 void parse(Reader &p, std::vector<uint8_t> &val, const std::true_type &) {
68     p.readBytes(val);
69 }
70 
71 template<typename T>
translatingParse(ResolvingReader & p,T & val,const std::true_type &)72 void translatingParse(ResolvingReader &p, T &val, const std::true_type &) {
73     p.parse(val);
74 }
75 
76 // @}
77 
78 } // namespace avro
79 
80 #endif
81