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#ifndef QPID_FRAMING_HANDLER_H
#define QPID_FRAMING_HANDLER_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/shared_ptr.h"
#include <vector>
#include <assert.h>
namespace qpid {
namespace framing {
/** Handler for objects of type T. */
template <class T> struct Handler {
typedef T Type;
typedef shared_ptr<Handler> Ptr;
virtual ~Handler() {}
virtual void handle(T) = 0;
virtual void link(Ptr next_) { next=next_; }
protected:
void nextHandler(T data) { if (next) next->handle(data); }
private:
Ptr next;
};
/** Factory interface that takes a context of type C */
template <class T, class C> struct HandlerFactory {
virtual ~HandlerFactory() {}
typedef typename Handler<T>::Ptr Ptr;
/** Create a handler */
virtual Ptr create(C context) = 0;
/** Create a handler and link it to next */
Ptr create(C context, Ptr next) {
Ptr h=create(context);
h->link(next);
}
};
/** Factory implementation template */
template <class FH, class C>
struct HandlerFactoryImpl : public HandlerFactory<typename FH::Type, C> {
shared_ptr<Handler<typename FH::Type> > create(C context) {
return typename FH::Ptr(new FH(context));
}
};
/** A factory chain is a vector of handler factories used to create
* handler chains. The chain does not own the factories.
*/
template <class T, class C>
struct HandlerFactoryChain : public std::vector<HandlerFactory<T,C>* > {
typedef typename Handler<T>::Ptr Ptr;
/** Create a handler chain, return the first handler.
*@param context - passed to each factory.
*/
Ptr create(C context) {
return this->create(context, this->begin());
}
private:
typedef typename std::vector<HandlerFactory<T,C>*>::iterator iterator;
Ptr create(C context, iterator i) {
if (i != this->end()) {
Ptr h=(*i)->create(context);
h->link(create(context, i+1));
return h;
}
return Ptr();
}
};
}}
#endif /*!QPID_FRAMING_HANDLER_H*/
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