// 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;

	}