colorreadhandler.java

这是一个segy数据显示程序

/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * ----------------
 * ColorReadHandler
 * ----------------
 * (C) Copyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: ColorReadHandler.java,v 1.7 2004/04/26 19:15:50 taqua Exp $
 *
 * Changes (from 25-Nov-2003)
 * --------------------------
 * 25-Nov-2003 : Added standard header and Javadocs (DG);
 *
 */

package org.jfree.xml.parser.coretypes;

import java.awt.Color;

import org.jfree.xml.parser.AbstractXmlReadHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

/**
 * A SAX handler for reading {@link Color} objects from an XML element.
 */
public class ColorReadHandler extends AbstractXmlReadHandler  {

    /** The color under construction. */
    private Color color;
    
    /**
     * Creates a new handler.
     */
    public ColorReadHandler() {
        super();
    }

    /**
     * Called at the start of parsing a {@link Color} element, this method reads the attributes and
     * constructs the {@link Color}. 
     * 
     * @param attrs  the attributes.
     * 
     * @throws SAXException to indicate a parsing error.
     */
    protected void startParsing(final Attributes attrs) throws SAXException {
        final String encodedValue = attrs.getValue("value");
        this.color = Color.decode(encodedValue);
        if (attrs.getValue("alpha") != null) {
            this.color = new Color(this.color.getRed(), this.color.getGreen(),
                                   this.color.getBlue(), 
                                   Integer.parseInt(attrs.getValue("alpha")));
        }
    }

    /**
     * Returns the color under construction.
     * 
     * @return the color.
     */
    public Object getObject() {
        return this.color;
    }
    
}