encoder.hpp

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#ifndef PROTON_CODEC_ENCODER_HPP
#define PROTON_CODEC_ENCODER_HPP
 
/*
 *
 * 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
 *
 *   http://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.
 *
 */
 
#include "../internal/data.hpp"
#include "../internal/type_traits.hpp"
#include "../types_fwd.hpp"
#include "./common.hpp"
 
#include <proton/type_compat.h>
 
 
namespace proton {
class scalar_base;
 
namespace internal{
class value_base;
}
 
namespace codec {
 
class encoder : public internal::data {
  public:
    explicit encoder(const data& d) : data(d) {}
 
    PN_CPP_EXTERN explicit encoder(internal::value_base& v);
 
    PN_CPP_EXTERN bool encode(char* buffer, size_t& size);
 
    PN_CPP_EXTERN void encode(std::string&);
 
    PN_CPP_EXTERN std::string encode();
 
    PN_CPP_EXTERN encoder& operator<<(bool);
    PN_CPP_EXTERN encoder& operator<<(uint8_t);
    PN_CPP_EXTERN encoder& operator<<(int8_t);
    PN_CPP_EXTERN encoder& operator<<(uint16_t);
    PN_CPP_EXTERN encoder& operator<<(int16_t);
    PN_CPP_EXTERN encoder& operator<<(uint32_t);
    PN_CPP_EXTERN encoder& operator<<(int32_t);
    PN_CPP_EXTERN encoder& operator<<(wchar_t);
    PN_CPP_EXTERN encoder& operator<<(uint64_t);
    PN_CPP_EXTERN encoder& operator<<(int64_t);
    PN_CPP_EXTERN encoder& operator<<(timestamp);
    PN_CPP_EXTERN encoder& operator<<(float);
    PN_CPP_EXTERN encoder& operator<<(double);
    PN_CPP_EXTERN encoder& operator<<(decimal32);
    PN_CPP_EXTERN encoder& operator<<(decimal64);
    PN_CPP_EXTERN encoder& operator<<(decimal128);
    PN_CPP_EXTERN encoder& operator<<(const uuid&);
    PN_CPP_EXTERN encoder& operator<<(const std::string&);
    PN_CPP_EXTERN encoder& operator<<(const symbol&);
    PN_CPP_EXTERN encoder& operator<<(const binary&);
    PN_CPP_EXTERN encoder& operator<<(const scalar_base&);
    PN_CPP_EXTERN encoder& operator<<(const null&);
    PN_CPP_EXTERN encoder& operator<<(decltype(nullptr));
 
    PN_CPP_EXTERN encoder& operator<<(const internal::value_base&);
 
    PN_CPP_EXTERN encoder& operator<<(const start&);
 
    PN_CPP_EXTERN encoder& operator<<(const finish&);
 
 
    // Undefined template to  prevent pointers being implicitly converted to bool.
    template <class T> void* operator<<(const T*);
 
    template <class T> struct list_cref { T& ref; list_cref(T& r) : ref(r) {} };
    template <class T> struct map_cref { T& ref;  map_cref(T& r) : ref(r) {} };
 
    template <class T> struct array_cref {
        start array_start;
        T& ref;
        array_cref(T& r, type_id el, bool described) : array_start(ARRAY, el, described), ref(r) {}
    };
 
    template <class T> static list_cref<T> list(T& x) { return list_cref<T>(x); }
    template <class T> static map_cref<T> map(T& x) { return map_cref<T>(x); }
    template <class T> static array_cref<T> array(T& x, type_id element, bool described=false) {
        return array_cref<T>(x, element, described);
    }
 
    template <class T> encoder& operator<<(const map_cref<T>& x) {
        internal::state_guard sg(*this);
        *this << start::map();
        for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
            *this << i->first << i->second;
        *this << finish();
        return *this;
    }
 
    template <class T> encoder& operator<<(const list_cref<T>& x) {
        internal::state_guard sg(*this);
        *this << start::list();
        for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
            *this << *i;
        *this << finish();
        return *this;
    }
 
    template <class T> encoder& operator<<(const array_cref<T>& x) {
        internal::state_guard sg(*this);
        *this << x.array_start;
        for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
            *this << *i;
        *this << finish();
        return *this;
    }
 
  private:
    template<class T, class U> encoder& insert(const T& x, int (*put)(pn_data_t*, U));
    void check(long result);
};
 
inline encoder& operator<<(encoder& e, const char* s) { return e << std::string(s); }
 
template <class T> typename std::enable_if<internal::is_unknown_integer<T>::value, encoder&>::type
operator<<(encoder& e, T i)  {
    using namespace internal;
    return e << static_cast<typename integer_type<sizeof(T), std::is_signed<T>::value>::type>(i);
}
 
 
namespace is_encodable_impl {   // Protect the world from fallback operator<<
 
using namespace internal;
 
sfinae::no operator<<(encoder const&, const sfinae::any_t &); // Fallback
 
template<typename T> struct is_encodable : public sfinae {
    static yes test(encoder&);
    static no test(...);         // Failed test, no match.
    static encoder* e;
    static const T* t;
    static bool const value = sizeof(test(*e << *t)) == sizeof(yes);
};
 
// Avoid recursion
template <> struct is_encodable<value> : public std::true_type {};
 
} // is_encodable_impl
 
using is_encodable_impl::is_encodable;
 
// Metafunction to test if a class looks like an encodable map from K to T.
template <class M, class K, class T, class Enable = void>
struct is_encodable_map : public std::false_type {};
 
template <class M, class K, class T> struct is_encodable_map<
    M, K, T, typename std::enable_if<
                 std::is_same<K, typename M::key_type>::value &&
                 std::is_same<T, typename M::mapped_type>::value &&
                 is_encodable<M>::value
                 >::type
    > : public std::true_type {};
 
 
 
} // codec
} // proton
 
#endif