/*

     File: CATokenMap.h

 Abstract: Part of CoreAudio Utility Classes

  Version: 1.1

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*/

#if !defined(__CATokenMap_h__)

#define __CATokenMap_h__

//=============================================================================

//  Includes

//=============================================================================

//  System Includes

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)

    #include <CoreAudio/CoreAudioTypes.h>

#else

    #include <CoreAudioTypes.h>

#endif

//  PublicUtility Includes

#include "CAMutex.h"

//  Standard Library Includes

#include <map>

#include <iterator>

//=============================================================================

//  CATokenMap

//=============================================================================

template <class T>

class   CATokenMap

{

//  Types

private:

    typedef std::map<UInt32, T*>    TokenMap;

//  Construction/Destruction

public:

            CATokenMap() : mTokenMap(), mNextToken(256), mTokenMapMutex("CATokenMap Mutex") {}

            ~CATokenMap() {}

//  Operations

public:

    bool    Lock()

    {

        return mTokenMapMutex.Lock();

    }

    void    Unlock()

    {

        mTokenMapMutex.Unlock();

    }

    UInt32  GetToken(T* inObject) const

    {

        CAMutex::Locker theLocker(const_cast<CAMutex&>(mTokenMapMutex));

        UInt32 theAnswer = 0;

        typename TokenMap::const_iterator i = mTokenMap.begin();

        while((theAnswer == 0) && (i != mTokenMap.end()))

        {

            if(i->second == inObject)

            {

                theAnswer = i->first;

            }

            std::advance(i, 1);

        }

        return theAnswer;

    }

    T*      GetObject(UInt32 inToken) const

    {

        CAMutex::Locker theLocker(const_cast<CAMutex&>(mTokenMapMutex));

        typename TokenMap::const_iterator i = mTokenMap.find(inToken);

        return i != mTokenMap.end() ? i->second : NULL;

    }

    T*      GetObject(const void* inToken) const

    {

        #if __LP64__

            return GetObject((UInt32)((UInt64)inToken));

        #else

            return GetObject((UInt32)inToken);

        #endif

    }

    UInt32  GetNumberObjects() const

    {

        CAMutex::Locker theLocker(const_cast<CAMutex&>(mTokenMapMutex));

        return static_cast<UInt32>(mTokenMap.size());

    }

    T*      GetObjectByIndex(UInt32 inIndex) const

    {

        T* theAnswer = NULL;

        CAMutex::Locker theLocker(const_cast<CAMutex&>(mTokenMapMutex));

        if(inIndex < mTokenMap.size())

        {

            typename TokenMap::const_iterator i = mTokenMap.begin();

            std::advance(i, inIndex);

            theAnswer = (i != mTokenMap.end()) ? i->second : NULL;

        }

        return theAnswer;

    }

    void    AddMapping(UInt32 inToken, T* inObject)

    {

        CAMutex::Locker theLocker(mTokenMapMutex);

        typename TokenMap::iterator i = mTokenMap.find(inToken);

        if(i != mTokenMap.end())

        {

            i->second = inObject;

        }

        else

        {

            mTokenMap.insert(typename TokenMap::value_type(inToken, inObject));

        }

    }

    void    RemoveMapping(UInt32 inToken, T* /*inObject*/)

    {

        CAMutex::Locker theLocker(mTokenMapMutex);

        typename TokenMap::iterator i = mTokenMap.find(inToken);

        if(i != mTokenMap.end())

        {

            mTokenMap.erase(i);

        }

    }

    UInt32  GetNextToken()

    {

        return mNextToken++;

    }

    UInt32  MapObject(T* inObject)

    {

        CAMutex::Locker theLocker(mTokenMapMutex);

        UInt32 theToken = GetNextToken();

        mTokenMap.insert(typename TokenMap::value_type(theToken, inObject));

        return theToken;

    }

    void    UnmapObject(T* inObject)

    {

        CAMutex::Locker theLocker(mTokenMapMutex);

        bool isDone = false;

        typename TokenMap::iterator i = mTokenMap.begin();

        while(!isDone && (i != mTokenMap.end()))

        {

            if(i->second == inObject)

            {

                mTokenMap.erase(i);

                isDone = true;

            }

            else

            {

                std::advance(i, 1);

            }

        }

    }

//  Implementation

private:    

    TokenMap    mTokenMap;

    UInt32      mNextToken;

    CAMutex     mTokenMapMutex;

};

#endif