--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/landmarksui/engine/src/CLmkDbEventListener.cpp Wed Sep 01 12:31:27 2010 +0100
@@ -0,0 +1,193 @@
+/*
+* Copyright (c) 2002 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: LandmarksUi Content File -
+*
+*/
+
+
+
+
+// INCLUDE FILES
+#include "CLmkDbEventListener.h"
+#include "MLmkDbObserver.h"
+#include <EPos_CPosLandmarkDatabase.h>
+#include <lmkerrors.h>
+
+
+// CONSTANTS
+/// Unnamed namespace for local definitions
+namespace {
+
+const TInt KLmkEventObserversGranularity( 5 );
+
+#if defined(_DEBUG)
+_LIT( KPanicMsg, "CLmkDbEventListener" );
+void Panic( TPanicCode aReason )
+ {
+ User::Panic( KPanicMsg, aReason );
+ }
+#endif
+} // namespace
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::CLmkDbEventListener
+// C++ constructor can NOT contain any code, that
+// might leave.
+// -----------------------------------------------------------------------------
+//
+CLmkDbEventListener::CLmkDbEventListener()
+ : CActive( EPriorityStandard ),
+ iObservers( KLmkEventObserversGranularity )
+ {
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::ConstructL
+// Symbian 2nd phase constructor can leave.
+// -----------------------------------------------------------------------------
+//
+void CLmkDbEventListener::ConstructL()
+ {
+ CActiveScheduler::Add( this );
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::NewL
+// Two-phased constructor.
+// -----------------------------------------------------------------------------
+//
+CLmkDbEventListener* CLmkDbEventListener::NewL()
+ {
+ CLmkDbEventListener* self =
+ new ( ELeave ) CLmkDbEventListener();
+
+ CleanupStack::PushL( self );
+ self->ConstructL();
+ CleanupStack::Pop();
+
+ return self;
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::~CLmkDbEventListener
+// -----------------------------------------------------------------------------
+//
+CLmkDbEventListener::~CLmkDbEventListener()
+ {
+ Cancel();
+ iObservers.Close();
+ delete iDbURI;
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::AddObserverL
+// -----------------------------------------------------------------------------
+//
+void CLmkDbEventListener::AddObserverL(
+ MLmkDbObserver& aObserver,
+ CPosLandmarkDatabase& aDb )
+ {
+ HBufC* paramURI = aDb.DatabaseUriLC();
+ if ( iDb )
+ { // Only one database currently supported
+ if ( iDbURI->Compare( *paramURI ) != 0 )
+ {
+ User::Leave( KErrNotSupported );
+ }
+ }
+
+ TInt index = iObservers.Find( &aObserver );
+ if ( index >= 0 )
+ {
+ User::Leave( KErrAlreadyExists );
+ }
+
+ User::LeaveIfError( iObservers.Append( &aObserver ) );
+ if ( iObservers.Count() == 1 )
+ {
+ iDb = &aDb;
+ StartListening();
+ }
+
+ // For simplicity we always assign new value to iDbURI although often
+ // the content remains the same as it was.
+ delete iDbURI;
+ iDbURI = paramURI;
+ CleanupStack::Pop(); // paramURI, ownership was transferred
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::RemoveObserver
+// -----------------------------------------------------------------------------
+//
+void CLmkDbEventListener::RemoveObserver( MLmkDbObserver& aObserver )
+ {
+ TInt index = iObservers.Find( &aObserver );
+ if ( index >= 0 )
+ {
+ iObservers.Remove( index );
+ }
+ if ( iObservers.Count() == 0 )
+ {
+ Cancel();
+ }
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::StartListening
+// -----------------------------------------------------------------------------
+//
+void CLmkDbEventListener::StartListening()
+ {
+ iEvent.iEventType = EPosLmEventUnknownChanges;
+ iEvent.iLandmarkItemId = KPosLmNullItemId;
+ __ASSERT_DEBUG( !IsActive(), Panic( KLmkPanicAlreadyActive ) );
+ __ASSERT_DEBUG( iDb, Panic( KLmkPanicNullMember ) );
+ iDb->NotifyDatabaseEvent( iEvent, iStatus );
+ SetActive();
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::RunL
+// -----------------------------------------------------------------------------
+//
+void CLmkDbEventListener::RunL()
+ {
+ // No need for implementing RunError() as long as RunL() is non-leaving.
+ for ( TInt i( 0 ); i < iObservers.Count(); ++i )
+ {
+ iObservers[i]->HandleDatabaseEvent( iEvent );
+ }
+ StartListening();
+ }
+
+// -----------------------------------------------------------------------------
+// CLmkDbEventListener::DoCancel
+// -----------------------------------------------------------------------------
+//
+void CLmkDbEventListener::DoCancel()
+ {
+ if ( iDb )
+ {
+ iDb->CancelNotifyDatabaseEvent();
+ // The policy is that when database observation is stopped we
+ // release the database association. It may become invalid after that.
+ iDb = NULL;
+ delete iDbURI;
+ iDbURI = NULL;
+ }
+ }
+
+// End of File