// Copyright (c) 1998-2009 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:

 //

 #include "UT_STD.H"

 EXPORT_C CEmbeddedStore* CEmbeddedStore::FromL(RReadStream& aHost)

 /** Opens the store hosted by the specified stream.

 Note that ownership of the stream passes to the store; the referenced RReadStream 

 is cleared.

 @param aHost A reference to the stream hosting the embedded store.

 @return A pointer to the embedded store object. */

 	{

 	CEmbeddedStore* store=FromLC(aHost);

 	CleanupStack::Pop();

 	return store;

 	}

 EXPORT_C CEmbeddedStore* CEmbeddedStore::FromLC(RReadStream& aHost)

 /** Open the store hosted by the specified stream, putting a pointer to the store 

 onto the cleanup stack.

 Putting a pointer to the embedded store object onto the cleanup stack allows 

 the object and allocated resources to be cleaned up if a subsequent leave 

 occurs.

 Note that ownership of the stream passes to the store and the referenced RReadStream 

 is cleared.

 @param aHost A reference to the stream hosting the embedded store.

 @return A pointer to the embedded store object. */

 	{

 	CEmbeddedStore* store=CEmbeddedStore::DoNewLC(aHost.Source());

 	store->MarshalL(aHost);

 	return store;

 	}

 EXPORT_C CEmbeddedStore* CEmbeddedStore::NewL(RWriteStream& aHost)

 /** Creates an embedded store within the specified host stream.

 Note that ownership of the stream passes to the store and the referenced RWriteStream 

 is cleared.

 @param aHost A reference to the stream which is to host the embedded store.

 @return A pointer to the embedded store object. */

 	{

 	CEmbeddedStore* store=NewLC(aHost);

 	CleanupStack::Pop();

 	return store;

 	}

 EXPORT_C CEmbeddedStore* CEmbeddedStore::NewLC(RWriteStream& aHost)

 /** Creates an embedded store within the specified host stream, putting a pointer 

 to the store onto the cleanup stack.

 Putting a pointer to the embedded store object onto the cleanup stack allows 

 the object and allocated resources to be cleaned up if a subsequent leave 

 occurs.

 Note that ownership of the stream passes to the store and the referenced RWriteStream 

 is cleared.

 @param aHost A reference to the stream which is to host the embedded store.

 @return A pointer to the embedded store object. */

 	{

 	CEmbeddedStore* store=CEmbeddedStore::DoNewLC(aHost.Sink());

 	store->ConstructL(aHost);

 	return store;

 	}

 EXPORT_C void CEmbeddedStore::Detach()

 /** Gives up ownership of the host stream buffer. The caller takes on the responsibility 

 for discarding the buffer. */

 	{

 	iHost.Host();

 	iHost.Release();

 	}

 EXPORT_C CEmbeddedStore::CEmbeddedStore(MStreamBuf* aHost)

 	: iHost(aHost)

 	{

 	__ASSERT_DEBUG(aHost!=NULL,Panic(EStoreNotOpen));

 	}

 EXPORT_C void CEmbeddedStore::MarshalL(RReadStream& aStream)

 //

 // Second-phase construction for opening existing stores.

 //

 	{

 	MStreamBuf* src=aStream.Source();

 	aStream=RReadStream();

 	__ASSERT_DEBUG(src!=NULL&&src==iHost.Host(),User::Invariant());

 	iStart=src->TellL(MStreamBuf::ERead);

 	RReadStream stream(src);

 	stream>>iRoot;

 	}

 EXPORT_C void CEmbeddedStore::ConstructL(RWriteStream& aStream)

 //

 // Second-phase construction for creating new stores.

 //

 	{

 	MStreamBuf* snk=aStream.Sink();

 	aStream=RWriteStream();

 	__ASSERT_DEBUG(snk!=NULL&&snk==iHost.Host(),User::Invariant());

 	iStart=snk->TellL(MStreamBuf::EWrite);

 	RWriteStream stream(snk);

 	stream<<iRoot;

 	}

 EXPORT_C CEmbeddedStore::~CEmbeddedStore()

 /** Frees resources owned by the object, prior to its destruction. In particular, 

 the destructor closes the associated file. */

 	{

 	MStreamBuf* buf=iHost.Host();

 	if (buf!=NULL)

 		buf->Release();

 	}

 EXPORT_C MStreamBuf* CEmbeddedStore::DoReadL(TStreamId anId) const

 	{

 	return HDirectStoreBuf::OpenL(MUTABLE_CAST(TStreamExchange&,iHost),anId,HDirectStoreBuf::ERead);

 	}

 EXPORT_C MStreamBuf* CEmbeddedStore::DoCreateL(TStreamId& anId)

 	{

 	return HDirectStoreBuf::CreateL(iHost,anId,HDirectStoreBuf::ERead|HDirectStoreBuf::EWrite);

 	}

 EXPORT_C void CEmbeddedStore::DoSetRootL(TStreamId anId)

 	{

 	RShareWriteStream stream(iHost,iStart);

 	stream.PushL();

 	stream<<anId;

 	CleanupStack::PopAndDestroy();

 	iRoot=anId;

 	}

 EXPORT_C void CEmbeddedStore::DoCommitL()

 	{

 	iHost.HostL()->SynchL();

 	}

 CEmbeddedStore* CEmbeddedStore::DoNewLC(MStreamBuf* aHost)

 	{

 	aHost->PushL();

 	CEmbeddedStore* store=new(ELeave) CEmbeddedStore(aHost);

 	CleanupStack::Pop();

 	CleanupStack::PushL(store);

 	return store;

 	}