lang/c++/api/AvroParse.hh

/*
 * 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_AvroParse_hh__
#define avro_AvroParse_hh__

#include "Config.hh"
#include "AvroTraits.hh"
#include "ResolvingReader.hh"

/// \file
///
/// Standalone parse functions for Avro types.

namespace avro {
    
/// The main parse entry point function.  Takes a parser (either validating or
/// plain) and the object that should receive the parsed data.

template <typename Reader, typename T>
void parse(Reader &p, T& val)
{
    parse(p, val, is_serializable<T>());
}

template <typename T>
void parse(ResolvingReader &p, T& val)
{
    translatingParse(p, val, is_serializable<T>());
}

/// Type trait should be set to is_serializable in otherwise force the compiler to complain.

template <typename Reader, typename T>
void parse(Reader &p, T& val, const std::false_type &)
{
    static_assert(sizeof(T) == 0, "Not a valid type to parse");
}

template <typename Reader, typename T>
void translatingParse(Reader &p, T& val, const std::false_type &)
{
    static_assert(sizeof(T) == 0, "Not a valid type to parse");
}

// @{

/// The remainder of the file includes default implementations for serializable types.


template <typename Reader, typename T>
void parse(Reader &p, T &val, const std::true_type &) {
    p.readValue(val);
}

template <typename Reader>
void parse(Reader &p, std::vector<uint8_t> &val, const std::true_type &) {
    p.readBytes(val);
}

template<typename T>
void translatingParse(ResolvingReader &p, T& val, const std::true_type &) {
    p.parse(val);
}

// @}

} // namespace avro

#endif