widgets/widgetrecognizer/src/WidgetRecognizer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 13:31:38 +0200
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/*
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* Copyright (c) 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 the License "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:  Recognizer for the widget supported MIME types.
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*
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*/
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#include "WidgetRecognizer.h"
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#include <ecom/implementationproxy.h>
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// CONSTANTS
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_LIT(KWidgetExtension, ".wgz");
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_LIT8(KWidgetMimeType,"application/x-nokia-widget");
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//
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// CWidgetsRecognizer
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//
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// ====================== MEMBER FUNCTIONS =============================
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// ============================================================================
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// CWidgetRecognizer::CWidgetRecognizer()
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// Default constructor
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//
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// @since 3.1
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// ============================================================================
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CWidgetRecognizer::CWidgetRecognizer()
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:CApaDataRecognizerType( KUidMimeWidgetRecognizer, CApaDataRecognizerType::EHigh )
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    {
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    iCountDataTypes = 1;
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    }
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// ============================================================================
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// From CApaDataRecognizerType
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// Gets the size of buffer preferred for the purpose of recognizing the data type.
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// @return The preferred data size.
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// @since 3.1
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// ============================================================================
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TUint CWidgetRecognizer::PreferredBufSize()
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    {
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    return 0x80;
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    }
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// ============================================================================
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// From CApaDataRecognizerType
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// Gets one of the data (MIME) types that the recognizer can recognize.
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// @param aIndex - An index that identifies the data type. Typically,
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//        the minimum value is zero and the maximum value is the value of MimeTypesCount() - 1.
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//
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// @return The data (MIME) type.
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// @since 3.1
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// ============================================================================
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TDataType CWidgetRecognizer::SupportedDataTypeL( TInt /*aIndex*/ ) const
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    {
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    // only support one widget mime type
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    return TDataType( KWidgetMimeType() );
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    }
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// ============================================================================
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// From CApaDataRecognizerType
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// This implements recognition behaviour -- called by RecognizeL()
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// @param aName - The name of the data; typically this is a file name
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//                containing the data to be recognized.
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// @param aBuffer - A buffer containing data to be recognized; typically,
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//                  this is read from the start of the file containing the data.
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//
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// @return void.
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// @since 3.1
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// ============================================================================
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void CWidgetRecognizer::DoRecognizeL( const TDesC& aName, const TDesC8& /*aBuffer*/ )
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    {
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    iConfidence = ENotRecognized;
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    if ( aName.Length() >= 4 )
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        {
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        TInt dotPos = aName.LocateReverse( '.' );
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        if ( dotPos != KErrNotFound )
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            {
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            TInt extLength = aName.Length() - dotPos;
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            HBufC* ext = aName.Right( extLength ).AllocL();
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            CleanupStack::PushL( ext );
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            // recognize .wgz extensions.
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            if (ext->CompareF( KWidgetExtension ) == 0)
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                {
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                iDataType = TDataType( KWidgetMimeType );
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                iConfidence = ECertain;
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                }
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            CleanupStack::PopAndDestroy();  // ext
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            }
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        }
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    }
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// ============================================================================
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// CWidgetRecognizer::CreateRecognizerL
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// Create CWidgetRecognizer instance
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// ============================================================================
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//
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CApaDataRecognizerType* CWidgetRecognizer::CreateRecognizerL()
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    {
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    return new (ELeave) CWidgetRecognizer();
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    }
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// Implementation table contains only one entry for widget recognizer
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const TImplementationProxy ImplementationTable[] =
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    {
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    IMPLEMENTATION_PROXY_ENTRY(KWidgetRecognizerImplUIDValue, CWidgetRecognizer::CreateRecognizerL)
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    };
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// ========================== OTHER EXPORTED FUNCTIONS =========================
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// ============================================================================
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// ImplementationGroupProxy
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// Returns the filters implemented in this DLL
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// Returns: The filters implemented in this DLL
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// ============================================================================
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//
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EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)
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    {
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    aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);
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    return ImplementationTable;
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    }