diff -r 000000000000 -r f72a12da539e menufw/hierarchynavigator/hnmetadatamodel/src/hnxmlmodelcache.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/menufw/hierarchynavigator/hnmetadatamodel/src/hnxmlmodelcache.cpp	Thu Dec 17 08:40:49 2009 +0200
@@ -0,0 +1,204 @@
+/*
+* Copyright (c) 2007-2008 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 "hnxmlmodelcache.h"
+#include "hnglobals.h"
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+TUint32 HBufCHashCache( HBufC* const &  aBuf )
+    {
+    return DefaultHash::Des16(*aBuf);
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+TBool HBufCIdentCache( HBufC* const & aL, HBufC* const & aR )
+    {
+    return DefaultIdentity::Des16(*aL, *aR);
+    }
+
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+CHnXmlModelCache::CHnXmlModelCache() : iDocuments( &HBufCHashCache, 
+        &HBufCIdentCache )
+    {
+    
+    }
+    
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CHnXmlModelCache::ConstructL()
+	{
+	
+	}
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CHnXmlModelCache::RemoveUnused()
+    {
+    // remove unnecessary (oldest and unused) xml cached documents
+    if(iDocuments.Count() > KXmlModelCacheMaxLength)
+        {
+        HBufC *suiteToRemove = iOrder[0];
+        RXmlEngDocument* document = iDocuments.Find( suiteToRemove );
+        document->Close();
+        iDocuments.Remove(suiteToRemove);
+        iOrder.Remove(0);
+        delete suiteToRemove;
+        }
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+TInt CHnXmlModelCache::AddL( const TDesC& aSuiteName, RXmlEngDocument& aDocument ) 
+    {
+    HBufC* key = aSuiteName.AllocLC();
+    iDocuments.InsertL( key, aDocument );
+    CleanupStack::Pop( key );
+    iOrder.AppendL( key );
+    RemoveUnused();
+    return KErrNone;
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+TBool CHnXmlModelCache::IsCachedL( const TDesC& aSuiteName )
+    {
+    HBufC* buf = aSuiteName.AllocLC();
+    const RXmlEngDocument* res = iDocuments.Find( buf );
+    CleanupStack::PopAndDestroy( buf );
+
+    if ( res )
+        return ETrue;
+    else
+        return EFalse;
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CHnXmlModelCache::MoveToTopL( const TDesC & aSuiteName )
+    {
+    TInt pos( KErrNotFound );
+    
+    for ( TInt i(0); i < iOrder.Count(); i++ )
+        {
+        if ( !iOrder[i]->Compare( aSuiteName ) )
+            {
+            pos = i;
+            break;
+            }
+        }
+
+    // if document was found and is not the latest in the array 
+    if ( pos != KErrNotFound && ( pos != iOrder.Count() - 1 ) )
+        {
+        HBufC *tmp = iOrder[ pos ];
+        iOrder.Remove( pos );
+        iOrder.AppendL( tmp );
+        }
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CHnXmlModelCache::GetL( const TDesC& aSuiteName,
+        RXmlEngDocument& aDocument )
+    {
+    HBufC* buf = aSuiteName.AllocLC();
+    const RXmlEngDocument* res = iDocuments.Find( buf );
+    
+    MoveToTopL( aSuiteName );
+
+    if ( res )
+        {
+        aDocument = *res;
+        }
+
+    CleanupStack::PopAndDestroy( buf );
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+CHnXmlModelCache* CHnXmlModelCache::NewLC()
+    {
+    CHnXmlModelCache* self = new (ELeave) CHnXmlModelCache();
+    CleanupStack::PushL( self );
+    self->ConstructL();
+    return self;
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+CHnXmlModelCache* CHnXmlModelCache::NewL()
+    {
+    CHnXmlModelCache* self = CHnXmlModelCache::NewLC();
+    CleanupStack::Pop( self );
+    return self;
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CHnXmlModelCache::Reset()
+    {
+    THashMapIter<HBufC*, RXmlEngDocument> iter( iDocuments );
+    while ( HBufC* const * ptr = iter.NextKey() )
+        {
+        RXmlEngDocument* currentDocument = iter.CurrentValue();
+        currentDocument->Close();
+        delete *ptr;
+        }
+    iDocuments.Close();
+    // Names have already been destroyed when destroying iDocuments so
+    // it is not necessay to destroy elements of the iOrder array. 
+    iOrder.Close(); 
+    }
+
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+CHnXmlModelCache::~CHnXmlModelCache()
+    {
+    Reset();
+    }