// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// ss_rmetaextensioncontainer.cpp 

//

#include "ss_rmetaextensioncontainer.h"

#include "ss_cmetaextensioncontainer.h"

using namespace ESock;

_LIT(KMecPanic, "mecpanic");

void PanicMec(TMecPanic aCode)

    {

    User::Panic(KMecPanic, aCode);

    }

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

// RMetaExtensionContainerC

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

EXPORT_C RMetaExtensionContainerC::RMetaExtensionContainerC()

    : iContainerImpl(NULL)

    {

    }

EXPORT_C RMetaExtensionContainerC::~RMetaExtensionContainerC()

    {

    }

EXPORT_C void RMetaExtensionContainerC::Open()

    {

    __ASSERT_ALWAYS(iContainerImpl, PanicMec(ENoImplementation));

    iContainerImpl->Open();

    }

EXPORT_C void RMetaExtensionContainerC::Open(const RMetaExtensionContainerC& aSource)

    {

    __ASSERT_ALWAYS(&aSource != this, PanicMec(EInvalidSelfReference));

    __ASSERT_ALWAYS(aSource.Container(), PanicMec(ENoImplementation));

    __ASSERT_ALWAYS(!iContainerImpl, PanicMec(EAlreadyOpen));

    aSource.Container()->Open();

    iContainerImpl = aSource.Container();

    }

EXPORT_C void RMetaExtensionContainerC::Close()

    {

    if (iContainerImpl)

        {

        iContainerImpl->Close();

        iContainerImpl = NULL;

        }

    }

EXPORT_C const Meta::SMetaData* RMetaExtensionContainerC::FindExtension(const Meta::STypeId& aTypeId) const

    {

    if (Container())

        {

        return Container()->FindExtension(aTypeId);

        }

    else

        {

        return NULL;

        }

    }

EXPORT_C const Meta::SMetaData& RMetaExtensionContainerC::FindExtensionL(const Meta::STypeId& aTypeId) const

    {

    if (!Container())

        {

        User::Leave(KErrNotFound);

        }

    return Container()->FindExtensionL(aTypeId);

    }

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

// RMetaExtensionContainer

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

EXPORT_C RMetaExtensionContainer::RMetaExtensionContainer()

    : iIsLazyCreationDone(EFalse), iIsOpen(EFalse), iCurrentExtensionContainer(NULL)

    {

    }

EXPORT_C void RMetaExtensionContainer::Open()

    {

    __ASSERT_ALWAYS(!iIsOpen, PanicMec(EAlreadyOpen));

    // Using lazy creation of the implementation so that Open() is infallible

    // This boolean ensures that Open() is still called before use of the container

    iIsOpen = ETrue;

    }

EXPORT_C void RMetaExtensionContainer::Open(const RMetaExtensionContainerC& aBaseContainer)

    {

    __ASSERT_ALWAYS(!iIsOpen, PanicMec(EAlreadyOpen));

	RMetaExtensionContainerC::Open(aBaseContainer);

    iIsOpen = ETrue;

    }

EXPORT_C void RMetaExtensionContainer::Close()

    {

    if (iIsOpen)

        {

        if (AppendableExtensionContainer())

        	{

        	AppendableExtensionContainer()->Compact();

        	}

        iIsOpen = EFalse;

        }

    RMetaExtensionContainerC::Close();

    }

void RMetaExtensionContainer::CreateExtensionContainerL()

    {

    // Don't call it unless it should be created

    __ASSERT_DEBUG(!AppendableExtensionContainer(), PanicMec(EIllegalState));

	CMetaExtensionContainerImplBase* pendingBaseContainerImpl = NULL;

	if (!iIsLazyCreationDone)

		{

		// Retrieve the pending base container implementation if there is one

		pendingBaseContainerImpl = Container();

		}

    CMetaExtensionContainer* mecImpl = CMetaExtensionContainer::NewLC(pendingBaseContainerImpl);

    if (!iIsLazyCreationDone)

    	{

    	// If there is no proper container implementation this normal extension container

    	// will become it.

    	// Base class takes ownership of the new container implementation reference

    	SetContainer(mecImpl);

        if (pendingBaseContainerImpl)

            {

            // Remove the holding reference - the new container implementation has its own

            pendingBaseContainerImpl->Close();

            }

        iIsLazyCreationDone = ETrue;

        }

    else

    	{

    	// There is an existing container implementation. Given the fact that the

    	// CreateExtensionContainerL method has been called it must be of the

    	// container array type. This will own (the reference on) our new extension

    	// container.

    	__ASSERT_DEBUG(Container()->Type() == CMetaExtensionContainerImplBase::EMetaExtensionContainerArray, PanicMec(EIllegalState));

    	__ASSERT_DEBUG(!pendingBaseContainerImpl, PanicMec(EIllegalState));

    	User::LeaveIfError(AppendableContainerArray()->AppendContainer(*mecImpl));

    	}

	__ASSERT_DEBUG(!iCurrentExtensionContainer, PanicMec(EIllegalState));

	iCurrentExtensionContainer = mecImpl;

    CleanupStack::Pop(mecImpl);

    }

void RMetaExtensionContainer::CreateContainerArrayL()

    {

    ASSERT(!AppendableContainerArray()); // Don't call it unless it should be created

	CMetaExtensionContainerImplBase* pendingBaseContainerImpl = NULL;

	if (!iIsLazyCreationDone)

		{

		// Retrieve the pending base container implementation if there is one

		pendingBaseContainerImpl = Container();

		}

	CMetaExtensionContainerArray* mecImpl = CMetaExtensionContainerArray::NewLC(pendingBaseContainerImpl);

    if (!iIsLazyCreationDone)

    	{

    	// If there is no proper container implementation this container array implementation

    	// will become it.

    	// Base class takes ownership of the new container implementation reference

    	SetContainer(mecImpl);

    	if (pendingBaseContainerImpl)

            {

            // Remove the holding reference - the new container implementation has its own

            pendingBaseContainerImpl->Close();

            }

    	iIsLazyCreationDone = ETrue;

    	}

    else

    	{

    	// There is an existing container implementation. Given the fact that the

    	// CreateContainerArrayL method has been called it must be of the

    	// normal extension container type. This will be replaced with a container

    	// array implementation which will own (the reference on) the existing

    	// container.

    	__ASSERT_DEBUG(Container()->Type() == CMetaExtensionContainerImplBase::EMetaExtensionContainer, PanicMec(EIllegalState));

    	__ASSERT_DEBUG(!pendingBaseContainerImpl, PanicMec(EIllegalState));

    	__ASSERT_DEBUG(iCurrentExtensionContainer, PanicMec(EIllegalState));

    	User::LeaveIfError(mecImpl->AppendContainer(*iCurrentExtensionContainer));

    	// Close our reference on the extension container, the container array will open its own

    	iCurrentExtensionContainer->Close();

    	iCurrentExtensionContainer = NULL;

    	SetContainer(mecImpl);

    	}

    CleanupStack::Pop(mecImpl);

    }

EXPORT_C const Meta::SMetaData* RMetaExtensionContainer::FindExtension(const Meta::STypeId& aTypeId) const

    {

    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));

    if (Container())

    	{

    	return Container()->FindExtension(aTypeId);

    	}

    return NULL;

    }

EXPORT_C const Meta::SMetaData& RMetaExtensionContainer::FindExtensionL(const Meta::STypeId& aTypeId) const

    {

    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));

    if (!Container())

    	{

        User::Leave(KErrNotFound);

    	}

	return Container()->FindExtensionL(aTypeId);

    }

EXPORT_C TInt RMetaExtensionContainer::AppendExtension(const Meta::SMetaData* aExtension)

    {

    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));

    if (!aExtension)

        {

        return KErrArgument;

        }

    CMetaExtensionContainer* mecImpl = AppendableExtensionContainer();

    if (!mecImpl)

        {

        // Do lazy creation

        TRAPD(err, CreateExtensionContainerL());

        if (err != KErrNone)

            {

            return err;

            }

        mecImpl = AppendableExtensionContainer();

        }

    return mecImpl->AppendExtension(aExtension);

    }

EXPORT_C void RMetaExtensionContainer::AppendExtensionL(const Meta::SMetaData* aExtension)

    {

    __ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));

    if (!aExtension)

        {

        User::Leave(KErrArgument);

        }

    CMetaExtensionContainer* mecImpl = AppendableExtensionContainer();

    if (!mecImpl)

        {

        // Do lazy creation

        CreateExtensionContainerL();

        mecImpl = AppendableExtensionContainer();

        }

    mecImpl->AppendExtensionL(aExtension);

    }

EXPORT_C void RMetaExtensionContainer::AppendContainerL(const RMetaExtensionContainerC& aContainer)

	{

    __ASSERT_ALWAYS(&aContainer != this, PanicMec(EInvalidSelfReference));

	__ASSERT_ALWAYS(iIsOpen, PanicMec(ENoImplementation));

	CMetaExtensionContainerImplBase* containerImpl = static_cast<const RMetaExtensionContainer&>(aContainer).Container();

	__ASSERT_ALWAYS(containerImpl, PanicMec(ENoImplementation));

	__ASSERT_ALWAYS(containerImpl != Container(), PanicMec(EInvalidSelfReference));

	CMetaExtensionContainerArray* mecImpl = AppendableContainerArray();

	if (!mecImpl)

		{

		// Do lazy creation

		CreateContainerArrayL();

		mecImpl = AppendableContainerArray();

		}

    const RMetaExtensionContainer& containerIfc = static_cast<const RMetaExtensionContainer&>(aContainer);

	User::LeaveIfError(mecImpl->AppendContainer(*containerIfc.Container()));

	// Null the current extension container pointer forcing a new extension container to be

	// created and appended to the array after the one that has been added

	iCurrentExtensionContainer = NULL;

	}

CMetaExtensionContainer* RMetaExtensionContainer::AppendableExtensionContainer() const

    {

	return iIsLazyCreationDone ? iCurrentExtensionContainer : NULL;

    }

CMetaExtensionContainerArray* RMetaExtensionContainer::AppendableContainerArray() const

    {

    if (iIsLazyCreationDone)

    	{

		const CMetaExtensionContainerImplBase* mecImpl = Container();

		if (mecImpl && mecImpl->Type() == CMetaExtensionContainerImplBase::EMetaExtensionContainerArray)

			{

			return const_cast<CMetaExtensionContainerArray*>(static_cast<const CMetaExtensionContainerArray*>(mecImpl));

			}

    	}

    return NULL;

    }