musichomescreen_multiview/mcpmusicplayer/src/filemonitor.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 13 Oct 2010 14:28:40 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: 201039 Kit: 201041
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/*
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* Copyright (c) 2008-2008 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:  Monitors the file system for changes in a file.
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*
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*/
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#include <e32base.h>
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#include <bautils.h>
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#include <mpxlog.h>
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#include "filemonitor.h"
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#include "filemonitorobserver.h"
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// ---------------------------------------------------------------------------
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// Constructor
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// ---------------------------------------------------------------------------
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//
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CFileMonitor::CFileMonitor( MFileMonitorObserver& aObserver)
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        : CActive( EPriorityNormal ),
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        iObserver( aObserver ),
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        iFilePath( NULL )
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    {
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    }
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// ---------------------------------------------------------------------------
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// Second Phase Constructor
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// ---------------------------------------------------------------------------
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//
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void CFileMonitor::ConstructL()
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    {
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    CActiveScheduler::Add( this );
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    User::LeaveIfError( iFs.Connect() );
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    }
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// ---------------------------------------------------------------------------
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// Two-phased constructor
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// ---------------------------------------------------------------------------
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//
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CFileMonitor* CFileMonitor::NewL( MFileMonitorObserver& aObserver)
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    {
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    CFileMonitor* self = new( ELeave ) CFileMonitor( aObserver);
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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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// Destructor
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// ---------------------------------------------------------------------------
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//
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CFileMonitor::~CFileMonitor()
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    {
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    Cancel();
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    iFs.Close();
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    delete iFilePath;
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    }
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// ---------------------------------------------------------------------------
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// Starts monitoring a particular file
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// ---------------------------------------------------------------------------
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//
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void CFileMonitor::StartL(  const TDesC& aFile)
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    {
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    MPX_DEBUG1("CFileMonitor::Start <---");
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    delete iFilePath;
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    iFilePath = NULL;
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    iFilePath = aFile.AllocL();
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    TNotifyType notType = ENotifyAll;
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    iFs.NotifyChange( notType, iStatus, *iFilePath );
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    SetActive();
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    MPX_DEBUG1("CFileMonitor::Start --->");
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    }
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// ---------------------------------------------------------------------------
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// RunL callback
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// ---------------------------------------------------------------------------
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//
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void CFileMonitor::RunL()
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    {
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    MPX_DEBUG1("CFileMonitor::RunL <---");
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    if (!BaflUtils::FileExists(iFs, *iFilePath ))
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        {
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        iObserver.HandleFileRemovedL();
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        MPX_DEBUG1("CFileMonitor::RunL - File was removed");
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        }
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    else
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        {
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        // Listen again
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        TNotifyType notType(ENotifyAll);
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        iFs.NotifyChange(notType, iStatus, *iFilePath);
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        SetActive();
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        MPX_DEBUG1("CFileMonitor::RunL - File exists");
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        }
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    MPX_DEBUG1("CFileMonitor::RunL --->");
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    }
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// ---------------------------------------------------------------------------
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// Handle Cancelling
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// ---------------------------------------------------------------------------
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//
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void CFileMonitor::DoCancel()
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    {
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    MPX_DEBUG1("CFileMonitor::DoCancel <---");
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    // Stop monitoring
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    iFs.NotifyChangeCancel();
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    MPX_DEBUG1("CFileMonitor::DoCancel --->");
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    }
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// ----------------------------------------------------------------------------
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// Handles a leave occurring in the request completion event handler RunL()
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// ----------------------------------------------------------------------------
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//
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TInt CFileMonitor::RunError(TInt aError)
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    {
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    MPX_DEBUG2("CFileMonitor::RunError(%d)", aError );
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    // Listen again
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    TNotifyType notType(ENotifyAll);
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    iFs.NotifyChange( notType, iStatus, *iFilePath );
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    SetActive();
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    return KErrNone;
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    }