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#ifndef QPID_FRAMING_INVOKER_H
#define QPID_FRAMING_INVOKER_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/AMQMethodBody.h"
#include "qpid/framing/MethodBodyDefaultVisitor.h"
#include "qpid/framing/StructHelper.h"
#include <boost/optional.hpp>
namespace qpid {
namespace framing {
class AMQMethodBody;
/**
* Base class for invoker visitors.
*/
class Invoker: public MethodBodyDefaultVisitor, protected StructHelper
{
public:
struct Result {
public:
Result() : handled(false) {}
const std::string& getResult() const { return result; }
bool hasResult() const { return !result.empty(); }
bool wasHandled() const { return handled; }
operator bool() const { return handled; }
std::string result;
bool handled;
};
void defaultVisit(const AMQMethodBody&) {}
Result getResult() const { return result; }
protected:
Result result;
};
/**
* Invoke an invocable object.
* Invocable classes must provide a nested type Invoker.
*/
template <class Invocable>
Invoker::Result invoke(Invocable& target, const AMQMethodBody& body) {
typename Invocable::Invoker invoker(target);
body.accept(invoker);
return invoker.getResult();
}
/**
* Invoke an invocable object.
* Invocable classes must provide a nested type Invoker.
*/
template <class Invocable>
Invoker::Result invoke(Invocable& target, const AMQBody& body) {
typename Invocable::Invoker invoker(target);
const AMQMethodBody* method = body.getMethod();
if (method)
method->accept(invoker);
return invoker.getResult();
}
}} // namespace qpid::framing
#endif /*!QPID_FRAMING_INVOKER_H*/
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