/*

* 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: This file implements class CEmailMailboxCache.

*

*/

#include "emailmailboxcache.h"

#include "emailapiutils.h"

static const TInt KCacheGranularity = 2;

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

// 

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

CEmailMailboxCache* CEmailMailboxCache::NewL()

    {

    CEmailMailboxCache* cache = new ( ELeave ) CEmailMailboxCache();

    return cache;

    }

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

// 

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

CEmailMailboxCache::~CEmailMailboxCache()

    {

    iEntries.Close();

    }

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

// Start of cache transaction with clenanup support

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

void CEmailMailboxCache::StartCachingPushL()

    {

    TCleanupItem item( &CEmailMailboxCache::CleanupOp, this );

    CleanupStack::PushL( item );

    iState = ECaching;

    iEntries.Reset();

    }

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

//  End of cache transaction

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

void CEmailMailboxCache::EndCachingPop()

    {

    iState = EComplete;

    CleanupStack::Pop();

    }

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

// 

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

TBool CEmailMailboxCache::IsCached() const

    {

    return iState == EComplete;

    }

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

// 

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

void CEmailMailboxCache::AddMailboxL( 

    CPluginData& aPluginData, 

    const TMailboxId& aMailboxId )

    {

    if ( iState != ECaching )

        {

        User::Leave( KErrNotReady );

        }

    if ( FindById( aMailboxId ) == KErrNotFound )

        {

        TCacheEntry entry( &aPluginData, aMailboxId );

        iEntries.AppendL( entry );

        }

    }

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

// 

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

CPluginData* CEmailMailboxCache::PluginDataL( const TMailboxId& aMailboxId ) const

    {

    CPluginData* pdata = NULL;

    const TInt index( FindById( aMailboxId ) );

    if ( index != KErrNotFound )

        {

        const TCacheEntry& entry = iEntries[ index ];

        pdata = entry.iPluginData;

        }

    return pdata;

    }

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

// 

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

CPluginData* CEmailMailboxCache::PluginDataL( const TUid& aPluginId ) const

    {

    CPluginData* pdata = NULL;

    const TInt index( FindByPluginIdL( aPluginId ) );

    if ( index != KErrNotFound )

        {

        const TCacheEntry& entry = iEntries[ index ];

        pdata = entry.iPluginData;

    return pdata;

    }

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

// 

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

void CEmailMailboxCache::GetIdsL( REmailMailboxIdArray& aIdArray ) const

    {

    if ( iState != EComplete )

        {

        // cache not up to date

        User::Leave( KErrNotReady );

        }

    for ( TInt i=0; i < iEntries.Count(); i++ )

        {

        TMailboxId id = iEntries[i].iMailboxId;

        aIdArray.AppendL( id );

        }

    }

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

// 

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

TInt CEmailMailboxCache::FindById( const TMailboxId& aMailboxId ) const

    {

    TIdentityRelation<TCacheEntry> rel( CEmailMailboxCache::Equals );

    // don't care about plugin data because this is seach key only and

    // mailbox id is used for search

    TCacheEntry entry( NULL, aMailboxId );

    return iEntries.Find( entry, rel );

    }

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

// 

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

TInt CEmailMailboxCache::FindByPluginIdL( const TUid& aPluginId ) const

    {

    TIdentityRelation<TCacheEntry> rel( CEmailMailboxCache::PluginEquals );

    CPluginData* key = new ( ELeave ) CPluginData( aPluginId );

    TCacheEntry entry( key, TMailboxId() );

    TInt index = iEntries.Find( entry, rel ); 

    delete key;

    return index;

    }

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

// 

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

TBool CEmailMailboxCache::Equals( const TCacheEntry& a1, const TCacheEntry& a2 )

    {

    return ( a1.iMailboxId == a2.iMailboxId );

    }

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

// 

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

TBool CEmailMailboxCache::PluginEquals( const TCacheEntry& a1, const TCacheEntry& a2 )

    {

    return ( a1.iPluginData->Uid() == a2.iPluginData->Uid() );

    }

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

// Cleanup 

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

void CEmailMailboxCache::CleanupOp( TAny* aAny )

    {

    CEmailMailboxCache* cache = reinterpret_cast<CEmailMailboxCache*>( aAny );

    cache->iEntries.Reset();

    cache->iState = EEmpty;

    }

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

// 

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

CEmailMailboxCache::CEmailMailboxCache() : 

    iState( EEmpty ), 

    iEntries( KCacheGranularity )

    {

    }