txmpiterator.incl_cpp

flash xmp sdk,flash官方SDK

// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2002-2007 Adobe Systems Incorporated
// All Rights Reserved
//
// NOTICE:	Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================

//	================================================================================================
/// \file TXMPIterator.incl_cpp
/// \brief The implementation of the TXMPIterator template class.

#include "XMP.hpp"
#include "client-glue/WXMP_Common.hpp"
#include "client-glue/WXMPIterator.hpp"

// =================================================================================================
// Implementation Guidelines
// =========================
//
// The implementations of the template functions are very stylized. The jobs done in this code are:
//
//	1. Set up the xmpIter template data member in the constructors.
//	2. Call through to the appropriate WXMPIterator function.
//	3. Copy returned strings and release the threading lock.
//
// The various kinds of functions follow similar patterns, first assuming no returned string:
//
// Constructors - Use an initializer for the xmpIter data member to call the WXMPIterator constructor.
// Destructor - Let the WXMPIterator destructor be implicitly called for the xmpIter data member.
// Static function - Simply call the corresponding WXMPIterator static function.
// Non-static function - Simply call the corresponding WXMPIterator function using xmpIter.
//
// If a member function has returned strings the code looks roughly like this:
//
//	<<<callthrough>>>
//	<<<checkfailure>>>
//	if ( <<<appropriate>>> ) {
//		if ( outStr != 0 ) outStr->assign ( outPtr, outLen );
//		<<<unlock>>>
//	}
//	return result;
//
// The <<<callthrough>>> is the call to the wrapper, and <<<checkfailure>>> is the check and throw
// if the wrapper reports failure. The <<<appropriate>>> check is used to determine if the string
// should actually be assigned. For example, GetProperty can't assign the value if the property
// does not exist. There is no <<<appropriate>>> check if it isn't, well, appropriate. Outputs are
// always passed as explicit pointers, and null can be passed if the string is not wanted. The
// inner implementation holds the threading lock if an output string is returned, regardless of
// whether the client wants it or not (which the implementation does not know).
//
// =================================================================================================

#ifndef XMP_TraceCTorDTor
	#define XMP_TraceCTorDTor 0
#endif

#if XMP_TraceCTorDTor
	class XIPeek {	// Hack to peek at the client ref count in the internal object.
	public:
		XIPeek();
		virtual ~XIPeek();
		XMP_Int32 clientRefs;
	};
#endif

// -------------------------------------------------------------------------------------------------

#define PropIterCTor(xmpRef,schemaNS,propName,options)												\
	WrapCheckIterRef ( newRef, zXMPIterator_PropCTor_1 ( xmpRef, schemaNS, propName, options ) );	\
	this->iterRef = newRef

// -------------------------------------------------------------------------------------------------

#define TableIterCTor(schemaNS,propName,options)													\
	WrapCheckIterRef ( newRef, zXMPIterator_TableCTor_1 ( schemaNS, propName, options ) );	\
	this->iterRef = newRef

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
TXMPIterator ( const TXMPIterator<tStringObj> & original ) : iterRef(original.iterRef)
{
	WXMPIterator_IncrementRefCount_1 ( this->iterRef );
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Copy construct TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_MethodIntro(TXMPIterator,void)::
operator= ( const TXMPIterator<tStringObj> & rhs )
{
	#if XMP_TraceCTorDTor
		XIPeek* xiLHS = (XIPeek*)this->iterRef;
		XIPeek* xiRHS = (XIPeek*)rhs.iterRef;
		printf ( "Assign TXMPIterator, lhs @ %.8X, rhs @ %.8X\n", this, &rhs );
		printf ( "   original lhs ref = %.8X, count = %d\n", xiLHS, xiLHS->clientRefs );
		printf ( "   original rhs ref = %.8X, count = %d\n", xiRHS, xiRHS->clientRefs );
	#endif
	XMPIteratorRef oldRef = this->iterRef;	// ! Decrement last so errors leave client object OK.
	this->iterRef = rhs.iterRef;
	WXMPIterator_IncrementRefCount_1 ( this->iterRef );
	WXMPIterator_DecrementRefCount_1 ( oldRef );
	#if XMP_TraceCTorDTor
		printf ( "   result   lhs ref = %.8X, count = %d\n", xiLHS, xiLHS->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
TXMPIterator() : iterRef(0)
{
	throw XMP_Error ( kXMPErr_Unavailable, "No default construction for XMP iterators" );
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Default construct TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
TXMPIterator ( const TXMPMeta<tStringObj> & xmpObj,
			   XMP_StringPtr  schemaNS,
			   XMP_StringPtr  propName,
			   XMP_OptionBits options /* = 0 */ ) : iterRef(0)
{
	PropIterCTor ( xmpObj.GetInternalRef(), schemaNS, propName, options );
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Construct property TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
TXMPIterator ( const TXMPMeta<tStringObj> & xmpObj,
			   XMP_StringPtr  schemaNS,
			   XMP_OptionBits options /* = 0 */ ) : iterRef(0)
{
	PropIterCTor ( xmpObj.GetInternalRef(), schemaNS, "", options );
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Construct schema TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
TXMPIterator ( const TXMPMeta<tStringObj> & xmpObj,
			   XMP_OptionBits options /* = 0 */ ) : iterRef(0)
{
	PropIterCTor ( xmpObj.GetInternalRef(), "", "", options );
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Construct tree TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
TXMPIterator ( XMP_StringPtr  schemaNS,
			   XMP_StringPtr  propName,
			   XMP_OptionBits options ) : iterRef(0)
{
	TableIterCTor ( schemaNS, propName, options );
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Construct table TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
}

// -------------------------------------------------------------------------------------------------

XMP_CTorDTorIntro(TXMPIterator)::
~TXMPIterator () throw()
{
	#if XMP_TraceCTorDTor
		XIPeek* xiPtr = (XIPeek*)this->iterRef;
		printf ( "Destruct TXMPIterator @ %.8X, ref = %.8X, count = %d\n", this, xiPtr, xiPtr->clientRefs );
	#endif
	WXMPIterator_DecrementRefCount_1 ( this->iterRef );
	this->iterRef = 0;
}

// -------------------------------------------------------------------------------------------------

XMP_MethodIntro(TXMPIterator,bool)::
Next ( tStringObj *		schemaNS /* = 0 */,
	   tStringObj *		propPath /* = 0 */,
	   tStringObj *		propValue /* = 0 */,
	   XMP_OptionBits * options /* = 0 */ )
{
	XMP_StringPtr schemaPtr = 0;
	XMP_StringLen schemaLen = 0;
	XMP_StringPtr pathPtr = 0;
	XMP_StringLen pathLen = 0;
	XMP_StringPtr valuePtr = 0;
	XMP_StringLen valueLen = 0;
	WrapCheckBool ( found, zXMPIterator_Next_1 ( &schemaPtr, &schemaLen, &pathPtr, &pathLen, &valuePtr, &valueLen, options ) );
	if ( found ) {
		if ( schemaNS != 0 ) schemaNS->assign ( schemaPtr, schemaLen );
		if ( propPath != 0 ) propPath->assign ( pathPtr, pathLen );
		if ( propValue != 0 ) propValue->assign ( valuePtr, valueLen );
		WXMPUtils_UnlockIter_1 ( this->iterRef, 0 );
	}
	return found;
}

// -------------------------------------------------------------------------------------------------

XMP_MethodIntro(TXMPIterator,void)::
Skip ( XMP_OptionBits options )
{
	WrapCheckVoid ( zXMPIterator_Skip_1 ( options ) );
}

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