datacommsserver/esockserver/ssock/ss_rmetaextensioncontainer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 12 Mar 2010 15:49:41 +0200
branchRCL_3
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permissions -rw-r--r--
Revision: 201008 Kit: 201008
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// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// ss_rmetaextensioncontainer.cpp 
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//
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#include "ss_rmetaextensioncontainer.h"
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#include "ss_cmetaextensioncontainer.h"
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using namespace ESock;
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_LIT(KMecPanic, "mecpanic");
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void PanicMec(TMecPanic aCode)
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    {
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    User::Panic(KMecPanic, aCode);
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    }
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// ===========================================================
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// RMetaExtensionContainerC
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// ===========================================================
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EXPORT_C RMetaExtensionContainerC::RMetaExtensionContainerC()
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    : iContainerImpl(NULL)
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    {
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    }
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EXPORT_C RMetaExtensionContainerC::~RMetaExtensionContainerC()
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    {
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    }
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EXPORT_C void RMetaExtensionContainerC::Open()
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    {
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    __ASSERT_ALWAYS(iContainerImpl, PanicMec(ENoImplementation));
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    iContainerImpl->Open();
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    }
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EXPORT_C void RMetaExtensionContainerC::Open(const RMetaExtensionContainerC& aSource)
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    {
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    __ASSERT_ALWAYS(&aSource != this, PanicMec(EInvalidSelfReference));
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    __ASSERT_ALWAYS(aSource.Container(), PanicMec(ENoImplementation));
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    __ASSERT_ALWAYS(!iContainerImpl, PanicMec(EAlreadyOpen));
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    aSource.Container()->Open();
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    iContainerImpl = aSource.Container();
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    }
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EXPORT_C void RMetaExtensionContainerC::Close()
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    {
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    if (iContainerImpl)
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        {
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        iContainerImpl->Close();
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        iContainerImpl = NULL;
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        }
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    }
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EXPORT_C const Meta::SMetaData* RMetaExtensionContainerC::FindExtension(const Meta::STypeId& aTypeId) const
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    {
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    __ASSERT_ALWAYS(iContainerImpl, PanicMec(ENoImplementation));
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    return iContainerImpl->FindExtension(aTypeId);
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    }
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EXPORT_C const Meta::SMetaData& RMetaExtensionContainerC::FindExtensionL(const Meta::STypeId& aTypeId) const
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    {
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    __ASSERT_ALWAYS(iContainerImpl, PanicMec(ENoImplementation));
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    return iContainerImpl->FindExtensionL(aTypeId);
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    }
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// ===========================================================
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// RMetaExtensionContainer
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// ===========================================================
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EXPORT_C RMetaExtensionContainer::RMetaExtensionContainer()
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    : iIsLazyCreationDone(EFalse), iIsOpen(EFalse), iCurrentExtensionContainer(NULL)
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    {
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    }
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EXPORT_C void RMetaExtensionContainer::Open()
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    {
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    __ASSERT_ALWAYS(!iIsOpen, PanicMec(EAlreadyOpen));
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    // Using lazy creation of the implementation so that Open() is infallible
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    // This boolean ensures that Open() is still called before use of the container
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    iIsOpen = ETrue;
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    }
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EXPORT_C void RMetaExtensionContainer::Open(const RMetaExtensionContainerC& aBaseContainer)
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    {
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    __ASSERT_ALWAYS(!iIsOpen, PanicMec(EAlreadyOpen));
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	RMetaExtensionContainerC::Open(aBaseContainer);
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    iIsOpen = ETrue;
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    }
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EXPORT_C void RMetaExtensionContainer::Close()
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    {
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    if (iIsOpen)
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        {
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        if (AppendableExtensionContainer())
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        	{
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        	AppendableExtensionContainer()->Compact();
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        	}
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        iIsOpen = EFalse;
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        }
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    RMetaExtensionContainerC::Close();
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    }
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   124
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void RMetaExtensionContainer::CreateExtensionContainerL()
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    {
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    // Don't call it unless it should be created
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    __ASSERT_DEBUG(!AppendableExtensionContainer(), PanicMec(EIllegalState));
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	CMetaExtensionContainerImplBase* pendingBaseContainerImpl = NULL;
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	if (!iIsLazyCreationDone)
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		{
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		// Retrieve the pending base container implementation if there is one
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		pendingBaseContainerImpl = Container();
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		}
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    CMetaExtensionContainer* mecImpl = CMetaExtensionContainer::NewLC(pendingBaseContainerImpl);
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    if (!iIsLazyCreationDone)
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    	{
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    	// If there is no proper container implementation this normal extension container
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    	// will become it.
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    	// Base class takes ownership of the new container implementation reference
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    	SetContainer(mecImpl);
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        if (pendingBaseContainerImpl)
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            {
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            // Remove the holding reference - the new container implementation has its own
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            pendingBaseContainerImpl->Close();
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            }
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        iIsLazyCreationDone = ETrue;
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        }
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    else
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    	{
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    	// There is an existing container implementation. Given the fact that the
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    	// CreateExtensionContainerL method has been called it must be of the
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    	// container array type. This will own (the reference on) our new extension
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    	// container.
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    	__ASSERT_DEBUG(Container()->Type() == CMetaExtensionContainerImplBase::EMetaExtensionContainerArray, PanicMec(EIllegalState));
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    	__ASSERT_DEBUG(!pendingBaseContainerImpl, PanicMec(EIllegalState));
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    	User::LeaveIfError(AppendableContainerArray()->AppendContainer(*mecImpl));
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    	}
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	__ASSERT_DEBUG(!iCurrentExtensionContainer, PanicMec(EIllegalState));
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	iCurrentExtensionContainer = mecImpl;
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    CleanupStack::Pop(mecImpl);
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    }
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   168
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   169
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void RMetaExtensionContainer::CreateContainerArrayL()
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    {
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    ASSERT(!AppendableContainerArray()); // Don't call it unless it should be created
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	CMetaExtensionContainerImplBase* pendingBaseContainerImpl = NULL;
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	if (!iIsLazyCreationDone)
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		{
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		// Retrieve the pending base container implementation if there is one
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		pendingBaseContainerImpl = Container();
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		}
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   180
	
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	CMetaExtensionContainerArray* mecImpl = CMetaExtensionContainerArray::NewLC(pendingBaseContainerImpl);
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    if (!iIsLazyCreationDone)
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    	{
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    	// If there is no proper container implementation this container array implementation
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    	// will become it.
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    	// Base class takes ownership of the new container implementation reference
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    	SetContainer(mecImpl);
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    	if (pendingBaseContainerImpl)
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            {
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            // Remove the holding reference - the new container implementation has its own
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            pendingBaseContainerImpl->Close();
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            }
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    	iIsLazyCreationDone = ETrue;
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    	}
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    else
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    	{
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    	// There is an existing container implementation. Given the fact that the
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    	// CreateContainerArrayL method has been called it must be of the
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    	// normal extension container type. This will be replaced with a container
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    	// array implementation which will own (the reference on) the existing
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    	// container.
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    	__ASSERT_DEBUG(Container()->Type() == CMetaExtensionContainerImplBase::EMetaExtensionContainer, PanicMec(EIllegalState));
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    	__ASSERT_DEBUG(!pendingBaseContainerImpl, PanicMec(EIllegalState));
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    	__ASSERT_DEBUG(iCurrentExtensionContainer, PanicMec(EIllegalState));
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    	User::LeaveIfError(mecImpl->AppendContainer(*iCurrentExtensionContainer));
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   208
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    	// Close our reference on the extension container, the container array will open its own
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    	iCurrentExtensionContainer->Close();
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    	iCurrentExtensionContainer = NULL;
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    	SetContainer(mecImpl);
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    	}
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   214
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    CleanupStack::Pop(mecImpl);
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    }
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   217
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   218
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EXPORT_C const Meta::SMetaData* RMetaExtensionContainer::FindExtension(const Meta::STypeId& aTypeId) const
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    {
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    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));
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    if (Container())
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    	{
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    	return Container()->FindExtension(aTypeId);
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    	}
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    return NULL;
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    }
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EXPORT_C const Meta::SMetaData& RMetaExtensionContainer::FindExtensionL(const Meta::STypeId& aTypeId) const
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    {
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    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));
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    if (!Container())
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    	{
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        User::Leave(KErrNotFound);
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    	}
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	return Container()->FindExtensionL(aTypeId);
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    }
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EXPORT_C TInt RMetaExtensionContainer::AppendExtension(const Meta::SMetaData* aExtension)
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    {
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    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));
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    if (!aExtension)
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        {
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        return KErrArgument;
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        }
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    CMetaExtensionContainer* mecImpl = AppendableExtensionContainer();
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    if (!mecImpl)
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        {
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        // Do lazy creation
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        TRAPD(err, CreateExtensionContainerL());
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        if (err != KErrNone)
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            {
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            return err;
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            }
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        mecImpl = AppendableExtensionContainer();
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        }
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    return mecImpl->AppendExtension(aExtension);
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    }
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EXPORT_C void RMetaExtensionContainer::AppendExtensionL(const Meta::SMetaData* aExtension)
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    {
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    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));
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    if (!aExtension)
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        {
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        User::Leave(KErrArgument);
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        }
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    CMetaExtensionContainer* mecImpl = AppendableExtensionContainer();
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    if (!mecImpl)
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        {
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        // Do lazy creation
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        CreateExtensionContainerL();
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        mecImpl = AppendableExtensionContainer();
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        }
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    mecImpl->AppendExtensionL(aExtension);
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    }
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EXPORT_C void RMetaExtensionContainer::AppendContainerL(const RMetaExtensionContainerC& aContainer)
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	{
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    __ASSERT_ALWAYS(&aContainer != this, PanicMec(EInvalidSelfReference));
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	__ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));
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	CMetaExtensionContainerImplBase* containerImpl = static_cast<const RMetaExtensionContainer&>(aContainer).Container();
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	__ASSERT_ALWAYS(containerImpl, PanicMec(ENoImplementation));
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	__ASSERT_ALWAYS(containerImpl != Container(), PanicMec(EInvalidSelfReference));
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   295
		
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	CMetaExtensionContainerArray* mecImpl = AppendableContainerArray();
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	if (!mecImpl)
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		{
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		// Do lazy creation
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		CreateContainerArrayL();
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		mecImpl = AppendableContainerArray();
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		}
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    const RMetaExtensionContainer& containerIfc = static_cast<const RMetaExtensionContainer&>(aContainer);
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	User::LeaveIfError(mecImpl->AppendContainer(*containerIfc.Container()));
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	// Null the current extension container pointer forcing a new extension container to be
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	// created and appended to the array after the one that has been added
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	iCurrentExtensionContainer = NULL;
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	}
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CMetaExtensionContainer* RMetaExtensionContainer::AppendableExtensionContainer() const
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    {
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	return iIsLazyCreationDone ? iCurrentExtensionContainer : NULL;
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    }
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CMetaExtensionContainerArray* RMetaExtensionContainer::AppendableContainerArray() const
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    {
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    if (iIsLazyCreationDone)
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    	{
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		const CMetaExtensionContainerImplBase* mecImpl = Container();
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		if (mecImpl && mecImpl->Type() == CMetaExtensionContainerImplBase::EMetaExtensionContainerArray)
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			{
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			return const_cast<CMetaExtensionContainerArray*>(static_cast<const CMetaExtensionContainerArray*>(mecImpl));
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			}
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    	}
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    return NULL;
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    }
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   332