sl@0: // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "UT_STD.H"
sl@0: 
sl@0: EXPORT_C TStreamId TSwizzleCBase::AsId() const
sl@0: /** Gets the streamid of the represented object.
sl@0: 
sl@0: This swizzle must currently represent the object as a stream id, otherwise 
sl@0: the function raises a STORE-Store 3 panic.
sl@0: 
sl@0: @return The stream id of the represented object */
sl@0: 	{
sl@0: 	__ASSERT_ALWAYS(IsId(),Panic(EStoreSwizzleBadId));
sl@0: 	return iPtr==NULL?KNullStreamId:TStreamId((TUint32)iPtr>>1); // implementation dependency
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void TSwizzleCBase::InternalizeL(RReadStream& aStream)
sl@0: /** Internalises a stream id from the read stream, constructs a swizzle from this 
sl@0: stream id and copies the swizzle to this swizzle.
sl@0: 
sl@0: The presence of this function means that the standard templated operator>>() 
sl@0: can be used to internalise objects of this class.
sl@0: 
sl@0: @param aStream Stream from which the stream id should be internalised */
sl@0: 	{
sl@0: 	TStreamId id;
sl@0: 	aStream>>id;
sl@0: 	*this=TSwizzleCBase(id);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TSwizzleCBase::TSwizzleCBase(TStreamId anId)
sl@0: //
sl@0: // Construct from a stream id.
sl@0: //
sl@0: 	: iPtr(anId==KNullStreamId?NULL:(TAny*)((anId.Value()<<1)|0x1))
sl@0: 	{}
sl@0: 
sl@0: EXPORT_C void TSwizzleCBase::DoExternalizeL(RWriteStream& aStream,TExternalizer<TAny> anExter) const
sl@0: //
sl@0: // Write this swizzle to aStream as an out-of-stream reference.
sl@0: //
sl@0: 	{
sl@0: 	aStream<<TStreamRef(iPtr,(IsPtr()?anExter.Function():NULL));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TBool TSwizzleCBase::IsPtrRep(const TAny* aPtr)
sl@0: //
sl@0: // Test whether aPtr is a valid representation for a pointer.
sl@0: //
sl@0: 	{
sl@0: 	return !((TUint32)aPtr&0x3); // implementation dependency
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TBool TSwizzleCBase::IsIdRep(const TAny* aPtr)
sl@0: //
sl@0: // Test whether aPtr is a valid representation for a stream id.
sl@0: //
sl@0: 	{
sl@0: 	return aPtr==NULL||(TUint32)aPtr&0x1; // implementation dependency
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void TSwizzleCBase::__DbgChkPtr(const TAny* aPtr)
sl@0: //
sl@0: // Check for invalid pointers.
sl@0: //
sl@0: 	{
sl@0: 	__ASSERT_ALWAYS(IsPtrRep(aPtr),Panic(EStoreSwizzleBadPtr));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void TSwizzleCBase::__DbgChkRef(TStreamRef aRef)
sl@0: //
sl@0: // Check for an invalid out-of-stream reference.
sl@0: //
sl@0: 	{
sl@0: 	__ASSERT_ALWAYS((IsPtrRep(aRef.Ptr())&&aRef.Function()!=NULL)||(IsIdRep(aRef.Ptr())&&aRef.Function()==NULL),Panic(EStoreSwizzleBadReference));
sl@0: 	}
sl@0: