/*

     File: CAComponent.h 

 Abstract:  Part of CoreAudio Utility Classes  

  Version: 1.01 

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*/

#ifndef __CAComponent_h__

#define __CAComponent_h__

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)

#else

    #include <ConditionalMacros.h>

#endif

#include "CAComponentDescription.h"

class CAComponent 

{

public:

    CAComponent ()

        : mComp (0), mDesc(), mManuName(0), mAUName(0), mCompName(0) {}

        // if next is specifed that is used to find the next component after that one

    CAComponent (const AudioComponentDescription& inDesc, CAComponent* next = 0);

    CAComponent (const CAComponent& y) 

        : mComp (0), mDesc(), mManuName(0), mAUName(0), mCompName(0) { *this = y; }

    CAComponent (const AudioComponent& comp);

    CAComponent (const AudioComponentInstance& compInst);

    CAComponent (OSType inType, OSType inSubtype = 0, OSType inManu = 0);

    ~CAComponent ();

    CAComponent&    operator= (const CAComponent& y);

        // returns true if this object references a valid component

    bool            IsValid () const { return Comp() != 0; }

    bool            HasAUStrings() const {  SetCompNames (); return mManuName != 0; }

        // CFStringRef should be retained by caller if needed beyond lifetime of this object

        // Can return NULL if component doesn't follow AU naming conventions

    CFStringRef     GetAUManu () const { SetCompNames (); return mManuName; }

    CFStringRef     GetAUName () const { SetCompNames (); return mAUName ? mAUName : mCompName; }

        // Return value of NULL indicates a problem getting that information from the component

    CFStringRef     GetCompName () const { SetCompNames(); return mCompName; }

    const CAComponentDescription&   Desc () const { return mDesc; }

    OSStatus        Open (AudioComponentInstance& outInst) const 

    {

        return AudioComponentInstanceNew (Comp(), &outInst);

    }

    OSStatus            GetVersion (UInt32 &outVersion) const;

    const AudioComponent&       Comp() const { return mComp; }

    void                Print(FILE* file = stdout) const;

    OSStatus            Save (CFPropertyListRef *outData) const;

    OSStatus            Restore (CFPropertyListRef &inData);

private:

    AudioComponent mComp;

    CAComponentDescription mDesc;

    CFStringRef mManuName, mAUName, mCompName;

    void    SetCompNames () const;

    void    SetCompInfo () const;

    void    Clear ();

};

#endif