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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_STATE_MATRIX_H_
#define MEDIA_BASE_STATE_MATRIX_H_
#include <map>
#include "base/logging.h"
namespace media {
class StateMatrix {
public:
StateMatrix();
~StateMatrix();
template <typename HandlerType>
void AddState(int state, int (HandlerType::* handler)()) {
CHECK(!IsStateDefined(state));
StateEntryBase* entry = new StateEntry<HandlerType>(handler);
states_.insert(std::make_pair(state, entry));
}
bool IsStateDefined(int state);
int ExecuteHandler(void* instance, int state);
private:
class StateEntryBase {
public:
StateEntryBase() {}
virtual ~StateEntryBase() {}
virtual int ExecuteHandler(void* instance) = 0;
};
template <typename HandlerType>
class StateEntry : public StateEntryBase {
public:
explicit StateEntry(int (HandlerType::* handler)()) : handler_(handler) {}
virtual ~StateEntry() {}
virtual int ExecuteHandler(void* instance) {
return (reinterpret_cast<HandlerType*>(instance)->*handler_)();
}
private:
int (HandlerType::* handler_)();
};
typedef std::map<int, StateEntryBase*> StateMap;
StateMap states_;
DISALLOW_COPY_AND_ASSIGN(StateMatrix);
};
} // namespace media
#endif // MEDIA_BASE_STATE_MATRIX_H_
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