--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/devsoundextensions/effects/DistAtten/DistanceAttenuationMessageHandler/src/DistanceAttenuationMessageHandler.cpp	Tue Feb 02 01:56:55 2010 +0200
@@ -0,0 +1,286 @@
+/*
+* Copyright (c) 2004 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:   Implementation of the DistanceAttenuation effect message handler class.
+*
+*/
+
+
+
+// INCLUDE FILES
+#include "DistanceAttenuationMessageHandler.h"
+#include "DistanceAttenuationMessageTypes.h"
+#include <DistanceAttenuationBase.h>
+#include "EffectDataQueItem.h"
+#ifdef _DEBUG
+#include <e32svr.h>
+#endif
+
+// ================= MEMBER FUNCTIONS =======================
+
+// C++ default constructor can NOT contain any code, that
+// might leave.
+//
+CDistanceAttenuationMessageHandler::CDistanceAttenuationMessageHandler(CDistanceAttenuation* aDistanceAttenuation)
+    :	CMMFObject(KUidDistanceAttenuationEffect),
+    	iDistanceAttenuation(NULL),
+    	iMessage(NULL),
+    	iRegistered(EFalse),
+    	iEffectDataQue(NULL)
+    {
+  	  iDistanceAttenuation = aDistanceAttenuation;
+    }
+
+
+EXPORT_C CDistanceAttenuationMessageHandler* CDistanceAttenuationMessageHandler::NewL(
+	TAny* aCustomInterface )
+    {
+    CDistanceAttenuation* aDistanceAttenuation = (CDistanceAttenuation*)aCustomInterface;
+    CDistanceAttenuationMessageHandler* self = new (ELeave) CDistanceAttenuationMessageHandler(aDistanceAttenuation);
+	self->ConstructL();
+    return self;
+    }
+
+
+// -----------------------------------------------------------------------------
+// CDistanceAttenuationMessageHandler::ConstructL
+// Symbian 2nd phase constructor can leave.
+// Create and initializes the effect data queue.
+// -----------------------------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::ConstructL()
+	{
+	iEffectDataQue = new(ELeave) TSglQue<CEffectDataQueItem>(_FOFF(CEffectDataQueItem, iLink));
+	}
+
+
+// -----------------------------------------------------------------------------
+// CDistanceAttenuationMessageHandler::~CDistanceAttenuationMessageHandler
+// Before going away, unregister with the CI DistanceAttenuation object.
+// The observation message must be completed if outstanding.
+// The effect data queue must be emptied and destroyed.
+// -----------------------------------------------------------------------------
+//
+CDistanceAttenuationMessageHandler::~CDistanceAttenuationMessageHandler()
+	{
+
+#ifdef _DEBUG
+    RDebug::Print(_L("CDistanceAttenuationMessageHandler::~CDistanceAttenuationMessageHandler"));
+#endif
+    if(iDistanceAttenuation)
+	    iDistanceAttenuation->UnRegisterObserver(*this);
+	iRegistered = EFalse;
+
+	if(iMessage)
+	{
+		if ( !iMessage->IsCompleted() )
+			{
+			iMessage->Complete(KErrCancel);
+			delete iMessage;
+			}
+	}
+
+    if ( iEffectDataQue )
+        {
+        CEffectDataQueItem* queItem;
+        while ( !iEffectDataQue->IsEmpty() )
+            {
+            queItem = iEffectDataQue->First();
+            iEffectDataQue->Remove(*queItem);
+            delete queItem;
+            }
+
+        delete iEffectDataQue;
+        }
+
+    delete iDistanceAttenuation;
+
+	}
+
+
+// ---------------------------------------------------------
+// CDistanceAttenuationMessageHandler::HandleRequest
+// (other items were commented in a header).
+// ---------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::HandleRequest(
+	TMMFMessage& aMessage )
+	{
+	ASSERT(aMessage.Destination().InterfaceId() == KUidDistanceAttenuationEffect);
+	TRAPD(error,DoHandleRequestL(aMessage));
+	if ( error )
+		{
+		aMessage.Complete(error);
+		}
+	}
+
+// ---------------------------------------------------------
+// CDistanceAttenuationMessageHandler::DoHandleRequestL
+// Dispatches the message to the appropriate handler.
+// ---------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::DoHandleRequestL(
+	TMMFMessage& aMessage )
+	{
+	switch( aMessage.Function() )
+		{
+		case EDaefInitialize:
+			{
+			DoInitializeL(aMessage);
+			break;
+			}
+		case EDaefApply:
+			{
+			DoApplyL(aMessage);
+			break;
+			}
+		case EDaefObserve:
+			{
+			DoObserveL(aMessage);
+			break;
+			}
+		default:
+			{
+			aMessage.Complete(KErrNotSupported);
+			}
+		}
+	}
+
+// ---------------------------------------------------------
+// CDistanceAttenuationMessageHandler::DoInitializeL
+// ---------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::DoInitializeL(TMMFMessage& aMessage)
+	{
+#ifdef _DEBUG
+    RDebug::Print(_L("CDistanceAttenuationMessageHandler::DoInitializeL"));
+#endif
+	aMessage.WriteDataToClient(iDistanceAttenuation->DoEffectData());
+	aMessage.Complete(KErrNone);
+	}
+
+// ---------------------------------------------------------
+// CDistanceAttenuationMessageHandler::DoApplyL
+// Extracts the data from the message. The client DistanceAttenuation
+// data is applied to the CI DistanceAttenuation object.
+// ---------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::DoApplyL(
+	TMMFMessage& aMessage )
+	{
+#ifdef _DEBUG
+    RDebug::Print(_L("CDistanceAttenuationMessageHandler::DoApplyL"));
+#endif
+    TEfDistanceAttenuationDataPckg distanceAttenuationPckgFromClient;
+    aMessage.ReadData1FromClient(distanceAttenuationPckgFromClient);
+	iDistanceAttenuation->SetEffectData(distanceAttenuationPckgFromClient);
+	iDistanceAttenuation->ApplyL();
+	aMessage.Complete(KErrNone);
+	}
+
+// ---------------------------------------------------------
+// CDistanceAttenuationMessageHandler::DoObserveL
+// Receives the observation request message and depending
+// on the status of the effect data queue, the message is
+// completed immediately or saved for later completion.
+// ---------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::DoObserveL(
+	TMMFMessage& aMessage )
+	{
+
+#ifdef _DEBUG
+    RDebug::Print(_L("CDistanceAttenuationMessageHandler::DoObserveL"));
+#endif
+
+	if ( !iRegistered )
+		{
+		iDistanceAttenuation->RegisterObserverL(*this);
+		iRegistered = ETrue;
+		}
+
+	if ( iEffectDataQue->IsEmpty() )
+		{
+		//iMessage = &aMessage;
+		iMessage = new(ELeave) TMMFMessage(aMessage);
+		}
+	else
+		{
+		TEfDistanceAttenuationDataPckg dataPckg;
+		CEffectDataQueItem* item = iEffectDataQue->First();
+		dataPckg.Copy(item->EffectData());
+		aMessage.WriteDataToClient(dataPckg);
+		aMessage.Complete(KErrNone);
+		iEffectDataQue->Remove(*item);
+		delete item;
+		}
+	}
+
+// ---------------------------------------------------------
+// CDistanceAttenuationMessageHandler::EffectChanged
+// The CI DistanceAttenuation object has changed state.
+// The observation message is completed if no data has been
+// queued up. Otherwise, the CI DistanceAttenuation object's data is
+// packaged and queued.
+// ---------------------------------------------------------
+//
+void CDistanceAttenuationMessageHandler::EffectChanged(
+	const CAudioEffect* aAudioEffect,
+	TUint8 /*aEvent*/ )
+	{
+#ifdef _DEBUG
+    RDebug::Print(_L("CDistanceAttenuationMessageHandler::EffectChanged"));
+#endif
+
+	if ( iMessage && !iMessage->IsCompleted() && iEffectDataQue->IsEmpty() )
+		{
+		iMessage->WriteDataToClient(((CDistanceAttenuation*)aAudioEffect)->DoEffectData());
+		iMessage->Complete(KErrNone);
+		delete iMessage;
+		iMessage = NULL;
+		}
+	else
+		{
+		// Saves the data and complete an observation message next time around.
+		HBufC8* data = NULL;
+		TRAPD(err1,data = ((CDistanceAttenuation*)aAudioEffect)->DoEffectData().AllocL());
+		if(!err1)
+			{
+				//CleanupStack::PushL(data);
+				CEffectDataQueItem* item = NULL;
+				TRAPD(err2,item = CEffectDataQueItem::NewL(data));
+				if(!err2)
+				{
+					iEffectDataQue->AddLast(*item);
+				}
+				else
+				{
+					delete data;
+				}
+			}
+		else
+			{
+#ifdef _DEBUG
+				RDebug::Print(_L("CDistanceAttenuationMessageHandler::EffectChanged Error Allocating Memory %d"),err1);
+#endif
+			}
+		}
+
+	}
+
+
+// ========================== OTHER EXPORTED FUNCTIONS =========================
+
+
+
+// End of File