/*

* Copyright (c) 2002-2006 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:  Provides directory listing cache

*

*/

// INCLUDE FILES

#include "CGflmDirectoryListingCache.h"

#include "GFLM.hrh"

#include "GflmUtils.h"

#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS

#include <f32file.h>

#else

#include <f32file.h>

#include <f32file_private.h>

#endif

#include <e32std.h>

// CONSTANTS

const TInt KListingGranularity = 0x2000; // 8KB

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::CGflmDirectoryListingCache

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CGflmDirectoryListingCache::CGflmDirectoryListingCache(

        RFs& aFss,

        const TBool& aCancelIndicator ) :

    iFss( aFss ),

    iCancelIndicator( aCancelIndicator )

    {

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::NewL

// Two-phased constructor.

// -----------------------------------------------------------------------------

//

CGflmDirectoryListingCache* CGflmDirectoryListingCache::NewL(

        RFs& aFss,

        const TBool& aCancelIndicator )

    {

    return new( ELeave ) CGflmDirectoryListingCache(

        aFss, aCancelIndicator );

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::~CGflmDirectoryListingCache()

// -----------------------------------------------------------------------------

//

CGflmDirectoryListingCache::~CGflmDirectoryListingCache()

    {

    delete iCache;

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::ClearCache()

// -----------------------------------------------------------------------------

//

void CGflmDirectoryListingCache::ClearCache()

    {

    iClearCache = ETrue;

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::ListingL()

// Looks if a directory's listing is already loaded and returns it. If the

// the listing is not found, it's read and added to the cache.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

const CGflmDirectoryListingCache::CEntryArray*

    CGflmDirectoryListingCache::ListingL( const TDesC& aDirectory )

    {

    TIMESTAMP( "GFLM listing fetch started: " )

    // Clear directory cache first if needed

    if ( iClearCache )

        {

        delete iCache;

        iCache = NULL;

        iClearCache = EFalse;

        }

    // Check if directory is already cached

    TBool found( EFalse );

    if ( iCache && !aDirectory.Compare( *( iCache->iDirectory ) ) )

        {

        found = ETrue;

        }

    if ( !found )

        {

        // Read directory to cache

        CListingNamePair* newPair = CListingNamePair::NewLC( aDirectory );

        GetDirL( *newPair );

        CleanupStack::Pop( newPair );

        delete iCache;

        iCache = NULL;

        iCache = newPair;

        }

    TIMESTAMP( "GFLM listing fetch ended: " )

    return iCache->iListing;

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::GetDirL

// -----------------------------------------------------------------------------

//

void CGflmDirectoryListingCache::GetDirL( CListingNamePair& aPair )

    {

    RDir dir;

    User::LeaveIfError( dir.Open(

        iFss,

        *aPair.iDirectory,

        KEntryAttNormal | KEntryAttDir ) );

    CleanupClosePushL( dir );

    TInt err( KErrNone );

	do

		{

        if ( iCancelIndicator )

            {

            // User has canceled the operation, abort

            User::Leave( KErrCancel );

            }

		err = dir.Read( iEntryBuffer );

		if ( err == KErrNone || err == KErrEof )

			{

			TInt entryCount( iEntryBuffer.Count() );

			if ( !entryCount )

			    {

				break;

				}

            for ( TInt i( 0 ); i < entryCount; i++ )

			    {

                const TEntry& entry( iEntryBuffer[ i ] );

                aPair.iListing->AppendL( entry, entrySize );

				}

			}

		}while ( err == KErrNone );

    if ( err != KErrNone && err != KErrEof )

        {

        User::Leave( err );

        }

    CleanupStack::PopAndDestroy( &dir );

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::CListingNamePair::~CListingNamePair()

// -----------------------------------------------------------------------------

//

CGflmDirectoryListingCache::CListingNamePair::~CListingNamePair()

    {

    delete iDirectory;

    if ( iListing )

        {

        iListing->Reset();

        delete iListing;

        }

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::CListingNamePair::ConstructL()

// -----------------------------------------------------------------------------

//

void CGflmDirectoryListingCache::CListingNamePair::ConstructL(

        const TDesC& aDirectory )

    {

    iDirectory = aDirectory.AllocL();

    iListing = new( ELeave ) CEntryArray( KListingGranularity );

    }

// -----------------------------------------------------------------------------

// CGflmDirectoryListingCache::CListingNamePair::NewLC()

// -----------------------------------------------------------------------------

//

CGflmDirectoryListingCache::CListingNamePair*

    CGflmDirectoryListingCache::CListingNamePair::NewLC(

        const TDesC& aDirectory )

    {

    CListingNamePair* self = new ( ELeave ) CListingNamePair();

    CleanupStack::PushL( self );

    self->ConstructL( aDirectory );

    return self;

    }

//  End of File