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#ifndef QPID_FRAMING_METHODHOLDER_H
#define QPID_FRAMING_METHODHOLDER_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/framing/AMQBody.h"
#include "qpid/framing/amqp_types.h"
#include "qpid/framing/amqp_types.h"
#include "qpid/framing/Blob.h"
#include "qpid/framing/MethodHolderMaxSize.h" // Generated file.
#include <boost/type_traits/is_base_and_derived.hpp>
#include <boost/utility/enable_if.hpp>
#include <utility>
namespace qpid {
namespace framing {
class AMQMethodBody;
class AMQBody;
class Buffer;
class MethodHolder;
std::ostream& operator<<(std::ostream& out, const MethodHolder& h);
/**
* Holder for arbitrary method body.
*/
// TODO aconway 2007-08-14: Fix up naming, this class should really be
// called AMQMethodBody and use a different name for the root of
// the concrete method body tree, which should not inherit AMQBody.
//
class MethodHolder
{
template <class T> struct EnableIfMethod:
public boost::enable_if<boost::is_base_and_derived<AMQMethodBody,T>,T>
{};
template <class T> EnableIfMethod<T>& assertMethod(T& t) { return t; }
public:
MethodHolder() {}
MethodHolder(ClassId& c, MethodId& m) { construct(c,m); }
/** Construct with a copy of a method body. */
MethodHolder(const AMQMethodBody& m) { *this = m; }
/** Copy method body into holder. */
MethodHolder& operator=(const AMQMethodBody&);
/** Construct the method body corresponding to class/method id */
void construct(ClassId c, MethodId m);
uint8_t type() const { return 1; }
void encode(Buffer&) const;
void decode(Buffer&);
uint32_t size() const;
/** Return method pointer or 0 if empty. */
AMQMethodBody* get();
const AMQMethodBody* get() const;
/** True if no method has been set */
bool empty() const { return blob.empty(); }
private:
Blob<MAX_METHODBODY_SIZE, AMQMethodBody> blob;
class CopyVisitor;
friend struct CopyVisitor;
};
}} // namespace qpid::framing
#endif /*!QPID_FRAMING_METHODHOLDER_H*/
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