/*

* 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:  This class provides the base class for metadata parsers.

*                This class is the highest class in parser hierarchy.

*

*/

#ifndef MMETADATAPARSER_H

#define MMETADATAPARSER_H

// INCLUDES

#include <e32base.h>

#include <MetaDataField.hrh>

#include <f32file.h>

#include <charconv.h>

#include <barsc.h>

#include <barsread.h>

// FORWARD DECLARATION

class CMetaDataFieldContainer;

// CONSTANTS

const TInt KUnicodeBOMNotFound		= 0;

const TInt KUnicodeBOMBigEndian		= 1;

const TInt KUnicodeBOMLittleEndian	= 2;

// CLASS DECLARATION

/**

*  This class implements the base class in metadata hierarchy.

*

*  @lib MetaDataUtility.lib

*  @since 3.0

*/

class CMetaDataParser : public CBase

	{

	public:  // Destructor

		/**

		* Destructor.

		*/

		virtual ~CMetaDataParser();

	protected:  // Constructor

        /**

        * C++ default constructor.

        */

		CMetaDataParser();

    public: // New functions

        /**

        * Parses the source and if metadata is found, the metadata fields are

        * inserted into the container.

        * @since 3.0

		* @param aWantedFields An array of TMetaDataFieldId's. Empty array is interpreted as all fields.

		* @param aContainer On return, metadata found in aSource is stored here

		* @return void

        */

		virtual void ParseL( const RArray<TMetaDataFieldId>& aWantedFields,

			CMetaDataFieldContainer& aContainer ) = 0;

        /**

        * Returns whether metadata was found or not.

        * @since 3.0

        * @return ETrue, if metadata was found

        */

		TBool MetaDataExists();

		/**

        * Returns id3 version for ID3 tag types

        * @since 3.0

        * @return TID3Type enum

        */

		virtual TID3Version ID3Version();

		/**

        * Maps ID3v1 genre integer to string

        * @param aNum genre integer code

        * @param aGenrePtr string genre value returned

        * @since 3.0

        * @return void

        */

		/**

        * Maps ID3v2 genre integer to string

        * @param aNum genre integer code

        * @param aGenrePtr string genre value returned

        * @since 3.0

        * @return void

        */

		void GenerateTopCharacterSetsL();

    protected:

        /**

        * Strips trailing zeros at the end of the field.

        * @since 3.0

        * @param aDesc The original descriptor

        * @return Pointer to descriptor without whitespace

        */

        /**

        * Returns BOM indication in the provided unicode.

        * @since 3.0

        * @param aUnicode Descriptor containing unicode.

        * @return KUnicodeBOMNotFound, KUnicodeBOMBigEndian, or KUnicodeBOMLittleEndian

		*/

		TInt UnicodeBOM( const TDesC8& aUnicode );

	protected:     // Data

		// Metadata container

		CMetaDataFieldContainer* iContainer;

		// Metadata exists

		TBool iExists;

		// File session

		RFs iFs;

		// Character set for unicode conversion

		CArrayFix<CCnvCharacterSetConverter::SCharacterSet>* iCharacterSet;

		// Most likely character set for unicode conversion

		CArrayFix<CCnvCharacterSetConverter::SCharacterSet>* iTopCharacterSet;

		RResourceFile iRscFile;

		//CArrayFixFlat<TInt>* installedLanguages;

	};

#endif      // MMETADATAPARSER_H

// End of File