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Diffstat (limited to 'qpid/cpp/src/qpid/amqp_0_10/Unit.h')
-rw-r--r-- | qpid/cpp/src/qpid/amqp_0_10/Unit.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/amqp_0_10/Unit.h b/qpid/cpp/src/qpid/amqp_0_10/Unit.h new file mode 100644 index 0000000000..0229e07419 --- /dev/null +++ b/qpid/cpp/src/qpid/amqp_0_10/Unit.h @@ -0,0 +1,82 @@ +#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*/ |