/*

* Copyright (c) 2007 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 parses CSS file to DOM document

 *

*/

package com.nokia.tools.themeinstaller.cssparser;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.io.Reader;

import org.w3c.css.sac.InputSource;

import org.w3c.css.sac.Parser;

import org.w3c.css.sac.helpers.ParserFactory;

import org.w3c.dom.Document;

import com.nokia.tools.themeinstaller.logger.LogWriter;

import com.nokia.tools.themeinstaller.odtconverter.ParseOperation;

import com.nokia.tools.themeinstaller.odtconverter.IParseOperationListener;

import com.nokia.tools.themeinstaller.odtconverter.ODTException;

/**

 * CSSParser parses the CSS File and uses CSSHandler to apply the

 * parsed style rules to DOM Document.

 */

public class CSSParser extends ParseOperation implements Runnable

    {

    /** The Constant CSS_PARSER_SYSTEM_VALUE. */

    private static final String CSS_PARSER_SYSTEM_VALUE = "org.w3c.css.sac.parser";

    /** The Constant CSS_PARSER_SYSTEM_KEY. */

    private static final String CSS_PARSER_SYSTEM_KEY = "org.apache.batik.css.parser.Parser";

    /** CSS file name */

    private String iFileName;

    /** The CSS handler. */

    private CSSHandler iCSSHandler;

    /** The CSS parser. */

    private Parser iParser;

    /**

     * Instantiates a new CSS parser.

     *

     * @param aFileName The CSS file name

     */

    public CSSParser( String aFileName )

        {

        iFileName = aFileName;

        ParserFactory factory = new ParserFactory();

        iCSSHandler = new CSSHandler();

        // Store the value-key pair of the used parser in the System

        // environment(JVM)

        System.setProperty( CSS_PARSER_SYSTEM_VALUE, CSS_PARSER_SYSTEM_KEY );

        try

            {

            iParser = factory.makeParser();

            }

        catch ( Exception e )

            {

            throw new IllegalStateException( "Could not load CSS parser" );

            }

        }

    public void setDocument( Document aDocument )

        {

        iDOMDocument = aDocument;

        }

    /**

     * Run the CSS parse operation.

     */

    public void run()

        {

        int error = IParseOperationListener.OPERATION_SUCCESSFUL;

        String reason = "";

        try

            {

            iCSSHandler.setDocument( iDOMDocument );

            File mainCSS = new File( iFileName );

            Reader r = new FileReader( mainCSS );

            // Tell CSS handler the directory for relative import paths,

            // that is, the path of the Main CSS file

            iCSSHandler.setImportDirectory( mainCSS.getParent() );

            InputSource is = new InputSource( r );

            iParser.setDocumentHandler( iCSSHandler );

            LogWriter.getInstance().logInfo(

                    this.getClass().getSimpleName() + ": Parsing CSS "

                            + iFileName );

            iParser.parseStyleSheet( is );

            iDOMDocument = iCSSHandler.getDocument();

            }

        catch ( Exception e )

            {

            reason = e.getMessage();

            error = IParseOperationListener.CSS_PARSER_ERROR;

            }

        super.operationCompleted( error, reason );

        }

    /**

     * Starts CSS parsing in a new thread.

     */

    public void parse() throws IOException, ODTException

        {

        Thread thread = new Thread( this );

        thread.start();

        }

    }