content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
   * USA.  
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
   * in the United States and other countries.]
   * 
   * ------------------------
   * GradientPaintReadHandler
   * ------------------------
   * (C) Copyright 2003, by Thomas Morgner and Contributors.
   *
   * Original Author:  Thomas Morgner;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * $Id: GradientPaintReadHandler.java,v 1.2 2005/10/18 13:33:32 mungady 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 java.awt.GradientPaint;
  import java.awt.geom.Point2D;
  
  import org.jfree.xml.parser.AbstractXmlReadHandler;
  import org.jfree.xml.parser.XmlReadHandler;
  import org.jfree.xml.parser.XmlReaderException;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  
  /**
   * A SAX handler for reading a {@link GradientPaint} from an XML element.
   */
  public class GradientPaintReadHandler extends AbstractXmlReadHandler  {
  
      /** The gradient paint under construction. */
      private GradientPaint gradient;
  
      /** The handler for color 1. */
      private XmlReadHandler color1Handler;
  
      /** The handler for color 2. */
      private XmlReadHandler color2Handler;
  
      /** The handler for point 1. */
      private XmlReadHandler point1Handler;
  
      /** The handler for point 2. */
      private XmlReadHandler point2Handler;
  
      /**
       * Creates a new handler.
       */
      public GradientPaintReadHandler() {
          super();
      }
  
      /**
       * Returns the gradient paint under construction.
       * 
       * @return the gradient paint.
       */
      public Object getObject() {
          return this.gradient;
      }
  
      /**
       * Returns the handler for a child element.
       * 
       * @param tagName  the tag name.
       * @param atts  the attributes.
       * 
       * @return the handler.
       * @throws SAXException to indicate a parsing error.
       * @throws XmlReaderException if there is a reader error.
       */
      protected XmlReadHandler getHandlerForChild(final String tagName, final Attributes atts)
          throws SAXException, XmlReaderException {
          if ("color1".equals(tagName)) {
              this.color1Handler = getRootHandler().createHandler(Color.class, tagName, atts);
              return this.color1Handler;
          }
          else if ("color2".equals(tagName)) {
              this.color2Handler = getRootHandler().createHandler(Color.class, tagName, atts);
              return this.color2Handler;
          }
          else if ("point1".equals(tagName)) {
              this.point1Handler = getRootHandler().createHandler(Point2D.class, tagName, atts);
              return this.point1Handler;
          }
          else if ("point2".equals(tagName)) {
              this.point2Handler = getRootHandler().createHandler(Point2D.class, tagName, atts);
              return this.point2Handler;
          }
          return null;
      }
  
      /**
       * At the end of parsing the element, the gradient paint is constructed.
       * 
       * @throws XmlReaderException if there is a parsing error.
       */
      protected void doneParsing() throws XmlReaderException {
          if (this.point1Handler == null || this.point2Handler == null 
              || this.color1Handler == null || this.color2Handler == null) {
              throw new XmlReaderException("Not all required subelements are defined.");
          }
          this.gradient = new GradientPaint
              ((Point2D) this.point1Handler.getObject(),
              (Color) this.color1Handler.getObject(),
              (Point2D) this.point2Handler.getObject(),
              (Color) this.color2Handler.getObject());
      }
  
  }
  