/*

* Copyright (c) 2006-2009 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: XMLHandler class to parse the resultant reverse geocoded

*              information.

*/

#ifndef __XMLHANDLER_H__

#define __XMLHANDLER_H__

// INCLUDE FILES

#include <e32base.h>

#include <xml/contenthandler.h> // for mcontenthandler

#include <xml/parser.h> // for cparser

using namespace Xml;

//Forward declarations

class CAddressInfo;

class CInternalAddressInfo;

/*

 * Category of the address information. This is used for

 * internal parsing procedure.

 */

namespace xmlhandler

    {

    enum TLocationInfoType

        {

        ENone = 0,

        ECountryName,

        EState,

        ECity,

        EDistrict,

        EPostalCode,

        EThoroughfareName,

        EThoroughfareNumber

        };

    }

/**

 * MXmlHandlerObserver, an observer to CXmlHandler class.

 */

class MXmlHandlerObserver

    {

    public:

    /*

     * Signifies the completion of parsing of the output data.

     * 

     * @param aError error status of parsing part.

     * @param aLocationInfo reference to the resultant address information structure.

     */    

    virtual void OnParseCompletedL( TInt aError, MAddressInfo& aLocationInfo ) = 0;

    };

/**

 * CXmlHandler, a class to parse XML file and then output log information

 * to a buffer.

 */

NONSHARABLE_CLASS( CXmlHandler ) : public MContentHandler

    {

    public: // Constructors and destructor

	/**

	* 1st phase constructor

	*

	* @param aObserver The observer class to be notified after xml parsing is done

	* 		  aAddressInfo   The address info 

	*/

    static CXmlHandler* NewL( MXmlHandlerObserver& aObserver, CInternalAddressInfo *aAddressInfo );

	/**

	* 1st phase constructor pushes the object into cleanup stack

	* @param aObserver The observer class to be notified after xml parsing is done

	* 		  aAddressInfo   The address info 

	*/	

    static CXmlHandler* NewLC( MXmlHandlerObserver& aObserver, CInternalAddressInfo *aAddressInfo  );

	/**

	* Destructor

	*/	

    virtual ~CXmlHandler();

    public: // Public methods

	/**

	* Starts parsing the xml content

	* @param aBuf The xml data 

	*/

    void StartParsingL(  HBufC8 *aBuf  );

    private: // Constructors

	/**

	* @param aObserver The observer class to be notified after xml parsing is done

	* @param aAddressInfo   The address info 

	*/

    CXmlHandler( MXmlHandlerObserver& aObserver, CInternalAddressInfo *aAddressInfo );

	/**

	* Second phase construction

	*/	

    void ConstructL();

    private: 

    // from MContentHandler

	/**

	* This method is a callback to indicate the start of the document

	* @param aDocParam 	Specifies the various parameters of the document. 

	* @param aErrorCode   The error code. If this is not KErrNone then special action may be required. 

	*

	*/	

    void OnStartDocumentL( const RDocumentParameters &aDocParam, TInt aErrorCode );

	/**

	* This method is a callback to indicate the end of the document

	* @param  aErrorCode   The error code. If this is not KErrNone then special action may be required. 

	*/	

    void OnEndDocumentL( TInt aErrorCode );

	/**

	* This method is a callback to indicate an element has been parsed.

	* @param aElement    Is a handle to the element's details. 

	* @param aAttributes   Contains the attributes for the element	

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required

	*/	

    void OnStartElementL( const RTagInfo &aElement, const RAttributeArray &aAttributes, TInt aErrorCode );

	/**

	* This method is a callback to indicate the end of the element has been reached. 

	* @param aElement    Is a handle to the element's details. 

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required

	*/

    void OnEndElementL( const RTagInfo &aElement, TInt aErrorCode );

	/**

	* This method is a callback that sends the content of the element

	* @param aBytes  the raw content data for the element

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required	

	*/	

    void OnContentL( const TDesC8 &aBytes, TInt aErrorCode );

	/**

	* This method is a notification of the beginning of the scope of a prefix-URI Namespace mapping

	* @param aPrefix     the Namespace prefix being declared

	* @param aUri         the Namespace URI the prefix is mapped to

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required	

	*/	

    void OnStartPrefixMappingL( const RString &aPrefix, const RString &aUri, TInt aErrorCode );

	/**

	* This method is a notification of the end of the scope of a prefix-URI mapping

	* @param aPrefix  the Namespace prefix being declared

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required	

	*/	

    void OnEndPrefixMappingL( const RString &aPrefix, TInt aErrorCode );

	/**

	* This method is a notification of ignorable whitespace in element content

	* @param aBytes    the ignored bytes from the document being parsed

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required	

	*/	

    void OnIgnorableWhiteSpaceL( const TDesC8 &aBytes, TInt aErrorCode );

	/**

	* This method is a notification of a skipped entity

	* @param aName  the name of the skipped entity. 

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required	

	*/	

    void OnSkippedEntityL( const RString &aName, TInt aErrorCode );

	/**

	* This method is a receive notification of a processing instruction.

	* @param aTarget the processing instruction target

	* @param aData   the processing instruction data

	* @param aErrorCode  The error code. If this is not KErrNone then special action may be required	

	*/	

    void OnProcessingInstructionL( const TDesC8 &aTarget, const TDesC8 &aData, TInt aErrorCode);

	/**

	* This method indicates an error has occurred

	* @param  aErrorCode  The error code. 

	*/	

    void OnError( TInt aErrorCode );

	/**

	* This method obtains the interface matching the specified uid. 

	* @param aUid  the uid identifying the required interface

	*/    

    TAny *GetExtendedInterface( const TInt32 aUid );

    private: // Private data

    MXmlHandlerObserver& iObserver;

    CParser*             iParser;

    HBufC8*              iBuffer;

    CInternalAddressInfo *iAddressInfo;

    xmlhandler::TLocationInfoType     iCurrentElement;

    TBool iThoroughfare ;

    };

#endif /* __XMLHANDLER_H__ */

// End of File