Decoder.hh

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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_Decoder_hh__
#define avro_Decoder_hh__
 
#include "Config.hh"
#include <cstdint>
#include <memory>
#include <string>
#include <vector>
 
#include "Stream.hh"
#include "ValidSchema.hh"
 
 
namespace avro {
 
class AVRO_DECL Decoder {
public:
    virtual ~Decoder() = default;
    virtual void init(InputStream &is) = 0;
 
    virtual void decodeNull() = 0;
 
    virtual bool decodeBool() = 0;
 
    virtual int32_t decodeInt() = 0;
 
    virtual int64_t decodeLong() = 0;
 
    virtual float decodeFloat() = 0;
 
    virtual double decodeDouble() = 0;
 
    std::string decodeString() {
        std::string result;
        decodeString(result);
        return result;
    }
 
    virtual void decodeString(std::string &value) = 0;
 
    virtual void skipString() = 0;
 
    std::vector<uint8_t> decodeBytes() {
        std::vector<uint8_t> result;
        decodeBytes(result);
        return result;
    }
 
    virtual void decodeBytes(std::vector<uint8_t> &value) = 0;
 
    virtual void skipBytes() = 0;
 
    std::vector<uint8_t> decodeFixed(size_t n) {
        std::vector<uint8_t> result;
        decodeFixed(n, result);
        return result;
    }
 
    virtual void decodeFixed(size_t n, std::vector<uint8_t> &value) = 0;
 
    virtual void skipFixed(size_t n) = 0;
 
    virtual size_t decodeEnum() = 0;
 
    virtual size_t arrayStart() = 0;
 
    virtual size_t arrayNext() = 0;
 
    virtual size_t skipArray() = 0;
 
    virtual size_t mapStart() = 0;
 
    virtual size_t mapNext() = 0;
 
    virtual size_t skipMap() = 0;
 
    virtual size_t decodeUnionIndex() = 0;
 
    virtual void drain() = 0;
};
 
using DecoderPtr = std::shared_ptr<Decoder>;
 
class AVRO_DECL ResolvingDecoder : public Decoder {
public:
    virtual const std::vector<size_t> &fieldOrder() = 0;
};
 
using ResolvingDecoderPtr = std::shared_ptr<ResolvingDecoder>;
AVRO_DECL DecoderPtr binaryDecoder();
 
AVRO_DECL DecoderPtr validatingDecoder(const ValidSchema &schema,
                                       const DecoderPtr &base);
 
AVRO_DECL DecoderPtr jsonDecoder(const ValidSchema &schema);
 
AVRO_DECL ResolvingDecoderPtr resolvingDecoder(const ValidSchema &writer,
                                               const ValidSchema &reader, const DecoderPtr &base);
 
} // namespace avro
 
#endif