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/*
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* Copyright (c) 2002-2006 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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* Plugin and view id caching support
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*
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*/
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// INCLUDE FILES
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#include "GSPluginAndViewIdCache.h"
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// System includes
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#include <bautils.h>
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#include <s32file.h>
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#include <eikappui.h>
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// User includes
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#include "GSShimmedView.h"
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#include "GSPlaceholderView.h"
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// Constants
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_LIT( KGSCacheFileName, "PluginUidToViewIdCache.dat" );
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// ================= MEMBER FUNCTIONS =======================
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::CGSPluginAndViewIdCache
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// C++ constructor.
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//
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// ---------------------------------------------------------------------------
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//
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CGSPluginAndViewIdCache::CGSPluginAndViewIdCache( CEikAppUi& aAppUi )
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: iAppUi( aAppUi ), iFsSession(CCoeEnv::Static()->FsSession()),iLookupTable( &HashFunction, &HashIdentityRelation )
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{
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::~CGSPluginAndViewIdCache
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// C++ destructor.
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//
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// ---------------------------------------------------------------------------
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//
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CGSPluginAndViewIdCache::~CGSPluginAndViewIdCache()
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{
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TRAP_IGNORE( StoreL() );
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//
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delete iPlaceholderView;
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DestroyShims();
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iLookupTable.Close();
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//
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::ConstructL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::ConstructL()
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{
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User::LeaveIfError( iFsSession.CreatePrivatePath( EDriveC ) );
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//
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iPlaceholderView = CGSPlaceholderView::NewL( iAppUi );
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//
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TRAP_IGNORE( RestoreL() );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::NewL
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//
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//
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// ---------------------------------------------------------------------------
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//
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CGSPluginAndViewIdCache* CGSPluginAndViewIdCache::NewL( CEikAppUi& aAppUi )
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{
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CGSPluginAndViewIdCache* self = new(ELeave) CGSPluginAndViewIdCache( aAppUi );
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CleanupStack::PushL( self );
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self->ConstructL();
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CleanupStack::Pop( self );
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return self;
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::ActivatePlaceholderViewL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::ActivatePlaceholderViewL()
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{
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iPlaceholderView->ActivateL();
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}
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// ----------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::PriorToPlaceholderActiveViewId
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//
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//
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// ----------------------------------------------------------------------------
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//
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const TVwsViewId& CGSPluginAndViewIdCache::PriorToPlaceholderActiveViewId() const
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{
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return iPlaceholderView->PreviouslyActiveViewId();
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::SetPriorToPlaceholderActiveViewId
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::SetPriorToPlaceholderActiveViewId( const TVwsViewId& aViewId )
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{
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iPlaceholderView->SetPreviouslyActiveViewId( aViewId );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::RegisterViewAndImplementationAssociationL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::RegisterViewAndImplementationAssociationL( TUid aViewId, TUid aImplementationUid )
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{
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RegisterViewAndImplementationAssociationL( aViewId, aImplementationUid, EFalse );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::PrepareToRegisterPluginInstanceLC
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::PrepareToRegisterPluginInstanceLC( TUid aViewId )
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{
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TCacheEntry* value = iLookupTable.Find( aViewId );
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if ( value && value->iShim )
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{
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// Store cleanup view uid so that we know which shim to re-register
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// if the cleanup item is invoked.
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iTransientCleanupViewUid = aViewId;
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// Prepare item
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TCleanupItem item( ReRegisterShimWithUi, this );
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CleanupStack::PushL( item );
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// Unregister shim view
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value->iShim->DeregisterView();
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// If a leave now occurs, the cleanup stack will unwind and will
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// invoke our cleanup item. This item will then re-add
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// the specified shim to the view framework. See ReRegisterShimWithUiL
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// for further details.
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}
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else
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{
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// Record not found - just push NULL to ensure cleanup stack
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// remains balanced.
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CleanupStack::PushL( (CBase*) NULL );
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}
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::RegisterPluginInstanceL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::RegisterPluginInstanceL( TUid aViewId, CGSPluginInterface& aPluginInstance )
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{
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TCacheEntry* value = iLookupTable.Find( aViewId );
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ASSERT( value != NULL );
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// Can now associate the plugin instance with the cache entry.
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value->iLoadedPluginImplementation = &aPluginInstance;
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::PluginImplementationUidForView
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//
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//
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// ---------------------------------------------------------------------------
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//
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TBool CGSPluginAndViewIdCache::IsPluginLoaded( TUid aViewId ) const
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{
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CGSPluginInterface* instance = PluginInstance( aViewId );
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TBool loaded = EFalse;
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if ( instance )
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{
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loaded = ETrue;
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}
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return loaded;
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::PluginInstance
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//
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//
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// ---------------------------------------------------------------------------
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//
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CGSPluginInterface* CGSPluginAndViewIdCache::PluginInstance( TUid aViewId ) const
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{
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CGSPluginInterface* ret = NULL;
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//
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const TCacheEntry* value = iLookupTable.Find( aViewId );
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if ( value )
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{
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ret = value->iLoadedPluginImplementation;
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}
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//
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return ret;
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::PluginImplementationUidForView
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//
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//
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// ---------------------------------------------------------------------------
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//
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TUid CGSPluginAndViewIdCache::PluginImplementationUidForView( TUid aViewId ) const
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{
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TUid pluginUid = KNullUid;
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//
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const TCacheEntry* value = iLookupTable.Find( aViewId );
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if ( value )
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{
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pluginUid = value->iImplementationUid;
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}
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//
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return pluginUid;
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::DestroyShims
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::DestroyShims()
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{
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RHashMap< TUid, TCacheEntry >::TIter iterator( iLookupTable );
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FOREVER
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{
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const TUid* key = iterator.NextKey();
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if ( key )
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{
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TCacheEntry* value = iterator.CurrentValue();
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// Destroy shim instance
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delete value->iShim;
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value->iShim = NULL;
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}
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else
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{
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break;
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}
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}
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::RestoreL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::RestoreL()
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{
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TFileName* cacheFile = new(ELeave) TFileName();
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CleanupStack::PushL( cacheFile );
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GetCacheFileNameL( *cacheFile );
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//
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if ( BaflUtils::FileExists( iFsSession, *cacheFile ) )
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{
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RFileReadStream cacheStream;
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TInt error = cacheStream.Open( iFsSession, *cacheFile, EFileRead );
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User::LeaveIfError( error );
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CleanupClosePushL( cacheStream );
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// Now read in cache hash table
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TUid key = KNullUid;
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TUid value = KNullUid;
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const TInt entryCount = cacheStream.ReadInt32L();
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for( TInt i=0; i<entryCount; i++ )
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{
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key.iUid = cacheStream.ReadUint32L();
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value.iUid = cacheStream.ReadUint32L();
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//
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RegisterViewAndImplementationAssociationL( key, value, ETrue );
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}
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CleanupStack::PopAndDestroy( &cacheStream );
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}
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//
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CleanupStack::PopAndDestroy( cacheFile );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::StoreL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::StoreL()
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{
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TFileName* intermediateFileName = new(ELeave) TFileName();
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CleanupStack::PushL( intermediateFileName );
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TFileName* cachePath = new(ELeave) TFileName();
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CleanupStack::PushL( cachePath );
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GetCachePathL( *cachePath );
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// Create a temporary file in the GS private data cage to contain
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// the cache data. We'll rename this to the real cache file name
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// once the operation has been completed successfully.
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RFile intermediateCacheFile;
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TInt error = intermediateCacheFile.Temp( iFsSession, *cachePath, *intermediateFileName, EFileWrite );
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User::LeaveIfError( error );
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// Create a stream from the file. Stream takes ownership of file
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RFileWriteStream stream( intermediateCacheFile );
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CleanupClosePushL( stream );
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// Write each entry to the stream
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stream.WriteUint32L( iLookupTable.Count() );
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RHashMap< TUid, TCacheEntry >::TIter iterator( iLookupTable );
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FOREVER
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{
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const TUid* key = iterator.NextKey();
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if ( key )
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{
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const TCacheEntry* value = iterator.CurrentValue();
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stream.WriteUint32L( key->iUid );
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stream.WriteUint32L( value->iImplementationUid.iUid );
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}
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else
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{
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break;
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}
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}
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// Finalise the stream
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stream.CommitL();
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stream.Close(); // Also closes the file
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CleanupStack::PopAndDestroy( &stream );
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// If we got this far it means we created the cache file successfully.
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// Now its okay to replace any pre-existing cache file with the
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// file we just created. We're re-use the cachePath variable for the
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// ultimate filename since it saves allocating another 1/2kb on the heap.
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GetCacheFileNameL( *cachePath );
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if ( BaflUtils::FileExists( iFsSession, *cachePath ) )
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{
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error = iFsSession.Delete( *cachePath );
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User::LeaveIfError( error );
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}
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// Now rename intermediate file name to ultimate cache file name.
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error = iFsSession.Rename( *intermediateFileName, *cachePath );
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User::LeaveIfError( error );
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CleanupStack::PopAndDestroy( 2, intermediateFileName );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::GetCacheFileNameL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::GetCacheFileNameL( TDes& aFileName )
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{
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GetCachePathL( aFileName );
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aFileName.Append( KGSCacheFileName );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::GetCachePathL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::GetCachePathL( TDes& aPath )
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{
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aPath.Zero();
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// Get private data cage path
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TInt err = iFsSession.PrivatePath( aPath );
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User::LeaveIfError( err );
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// Combine with C: drive
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const TDriveUnit cDrive( EDriveC );
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const TDriveName cDriveName( cDrive.Name() );
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aPath.Insert( 0, cDriveName );
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}
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// ---------------------------------------------------------------------------
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// CGSPluginAndViewIdCache::RegisterViewAndImplementationAssociationL
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//
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//
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// ---------------------------------------------------------------------------
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//
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void CGSPluginAndViewIdCache::RegisterViewAndImplementationAssociationL( TUid aViewId, TUid aImplementationUid, TBool aCreateShim )
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{
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// Check if aViewId is a key within the look up table, so as to avoid
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// adding duplicate entries...
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const TCacheEntry* value = iLookupTable.Find( aViewId );
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if ( !value )
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{
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// No registration for this view yet, so create a new entry
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TCacheEntry cacheEntry;
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cacheEntry.iImplementationUid = aImplementationUid;
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cacheEntry.iLoadedPluginImplementation = NULL;
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if ( aCreateShim )
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{
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// Create a new shim
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cacheEntry.iShim = CGSShimmedView::NewLC( aViewId, *this, iAppUi );
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}
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else
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{
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cacheEntry.iShim = NULL;
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}
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// Add entry to table - the shim ownership is also transferred
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// at this point, since the destructor of this class will
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// destroy all shims.
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iLookupTable.InsertL( aViewId, cacheEntry );
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|
461 |
if ( aCreateShim )
|
|
462 |
{
|
|
463 |
CleanupStack::Pop( cacheEntry.iShim );
|
|
464 |
}
|
|
465 |
}
|
|
466 |
}
|
|
467 |
|
|
468 |
|
|
469 |
// ---------------------------------------------------------------------------
|
|
470 |
// CGSPluginAndViewIdCache::PrepareForUIDestruction
|
|
471 |
//
|
|
472 |
//
|
|
473 |
// ---------------------------------------------------------------------------
|
|
474 |
//
|
|
475 |
void CGSPluginAndViewIdCache::PrepareForUIDestruction()
|
|
476 |
{
|
|
477 |
// Have to remove all UI furniture before the AppUi rug is pulled out
|
|
478 |
// from underneath us...
|
|
479 |
DestroyShims();
|
|
480 |
//
|
|
481 |
delete iPlaceholderView;
|
|
482 |
iPlaceholderView = NULL;
|
|
483 |
}
|
|
484 |
|
|
485 |
|
|
486 |
// ---------------------------------------------------------------------------
|
|
487 |
// CGSPluginAndViewIdCache::HandleShimDestruction
|
|
488 |
//
|
|
489 |
//
|
|
490 |
// ---------------------------------------------------------------------------
|
|
491 |
//
|
|
492 |
void CGSPluginAndViewIdCache::HandleShimDestruction( TUid aViewId )
|
|
493 |
{
|
|
494 |
TCacheEntry* value = iLookupTable.Find( aViewId );
|
|
495 |
if ( value && value->iShim )
|
|
496 |
{
|
|
497 |
// The shim has been destroyed.
|
|
498 |
value->iShim = NULL;
|
|
499 |
}
|
|
500 |
}
|
|
501 |
|
|
502 |
|
|
503 |
// ---------------------------------------------------------------------------
|
|
504 |
// CGSPluginAndViewIdCache::ReRegisterShimWithUi
|
|
505 |
//
|
|
506 |
//
|
|
507 |
// ---------------------------------------------------------------------------
|
|
508 |
//
|
|
509 |
void CGSPluginAndViewIdCache::ReRegisterShimWithUi( TAny* aSelf )
|
|
510 |
{
|
|
511 |
CGSPluginAndViewIdCache* self = reinterpret_cast< CGSPluginAndViewIdCache* >( aSelf );
|
|
512 |
//
|
|
513 |
if ( self->iTransientCleanupViewUid != KNullUid )
|
|
514 |
{
|
|
515 |
TCacheEntry* value = self->iLookupTable.Find( self->iTransientCleanupViewUid );
|
|
516 |
if ( value && value->iShim )
|
|
517 |
{
|
|
518 |
TRAP_IGNORE( value->iShim->RegisterViewL() );
|
|
519 |
}
|
|
520 |
}
|
|
521 |
//
|
|
522 |
self->iTransientCleanupViewUid = KNullUid;
|
|
523 |
}
|
|
524 |
|
|
525 |
|
|
526 |
// ---------------------------------------------------------------------------
|
|
527 |
// CGSPluginAndViewIdCache::HashFunction
|
|
528 |
//
|
|
529 |
//
|
|
530 |
// ---------------------------------------------------------------------------
|
|
531 |
//
|
|
532 |
TUint32 CGSPluginAndViewIdCache::HashFunction( const TUid& aViewId )
|
|
533 |
{
|
|
534 |
const TUint32 hash = DefaultHash::Integer( aViewId.iUid );
|
|
535 |
return hash;
|
|
536 |
}
|
|
537 |
|
|
538 |
|
|
539 |
// ---------------------------------------------------------------------------
|
|
540 |
// CGSPluginAndViewIdCache::HashIdentityRelation
|
|
541 |
//
|
|
542 |
//
|
|
543 |
// ---------------------------------------------------------------------------
|
|
544 |
//
|
|
545 |
TBool CGSPluginAndViewIdCache::HashIdentityRelation( const TUid& aLeft, const TUid& aRight )
|
|
546 |
{
|
|
547 |
const TBool equal = ( aLeft.iUid == aRight.iUid );
|
|
548 |
return equal;
|
|
549 |
}
|
|
550 |
|