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#ifndef QPID_AMQP_0_10_UNIT_H
#define QPID_AMQP_0_10_UNIT_H
/*
*
* 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 "qpid/amqp_0_10/ControlHolder.h"
#include "qpid/amqp_0_10/CommandHolder.h"
#include "qpid/amqp_0_10/Header.h"
#include "qpid/amqp_0_10/Body.h"
#include "qpid/amqp_0_10/FrameHeader.h"
#include <boost/variant.hpp>
#include <ostream>
namespace qpid {
namespace amqp_0_10 {
/**
* A Unit contains a frame header and associated value.
* For all types except BODY the frame header is for a complete segment.
*/
class Unit {
public:
explicit Unit(const FrameHeader& h=FrameHeader()) : header(h) { updateVariant(); }
/**
*@param flags: is ORed with the required flags for type T.
*/
template <class T>
explicit Unit(const T& t, uint8_t flags=0) : variant(t) { updateHeader(flags); }
void setHeader(FrameHeader& h) { header = h; updateVariant(); }
const FrameHeader& getHeader() const { return header; }
template<class T> const T* get() const { return boost::get<T>(&variant); }
template<class T> T* get() { return boost::get<T>(&variant); }
template<class T> Unit& operator=(const T& t) { variant=t; return *this; }
template <class V> typename V::result_type applyVisitor(V& v) const {
variant.apply_visitor(v);
}
template <class S> void serialize(S& s) { variant.apply_visitor(s); s.split(*this); }
template <class S> void encode(S&) const {}
template <class S> void decode(S&) { updateHeader(header.getFlags()); }
private:
typedef boost::variant<ControlHolder, CommandHolder, Header, Body> Variant;
void updateHeader(uint8_t flags);
void updateVariant();
Variant variant;
FrameHeader header;
friend std::ostream& operator<<(std::ostream& o, const Unit& u);
};
std::ostream& operator<<(std::ostream& o, const Unit& u);
}} // namespace qpid::amqp_0_10
#endif /*!QPID_AMQP_0_10_UNIT_H*/
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