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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------------ 28: * GradientPaintReadHandler 29: * ------------------------ 30: * (C) Copyright 2003, by Thomas Morgner and Contributors. 31: * 32: * Original Author: Thomas Morgner; 33: * Contributor(s): David Gilbert (for Object Refinery Limited); 34: * 35: * $Id: GradientPaintReadHandler.java,v 1.2 2005/10/18 13:33:32 mungady Exp $ 36: * 37: * Changes (from 25-Nov-2003) 38: * -------------------------- 39: * 25-Nov-2003 : Added standard header and Javadocs (DG); 40: * 41: */ 42: 43: package org.jfree.xml.parser.coretypes; 44: 45: import java.awt.Color; 46: import java.awt.GradientPaint; 47: import java.awt.geom.Point2D; 48: 49: import org.jfree.xml.parser.AbstractXmlReadHandler; 50: import org.jfree.xml.parser.XmlReadHandler; 51: import org.jfree.xml.parser.XmlReaderException; 52: import org.xml.sax.Attributes; 53: import org.xml.sax.SAXException; 54: 55: /** 56: * A SAX handler for reading a {@link GradientPaint} from an XML element. 57: */ 58: public class GradientPaintReadHandler extends AbstractXmlReadHandler { 59: 60: /** The gradient paint under construction. */ 61: private GradientPaint gradient; 62: 63: /** The handler for color 1. */ 64: private XmlReadHandler color1Handler; 65: 66: /** The handler for color 2. */ 67: private XmlReadHandler color2Handler; 68: 69: /** The handler for point 1. */ 70: private XmlReadHandler point1Handler; 71: 72: /** The handler for point 2. */ 73: private XmlReadHandler point2Handler; 74: 75: /** 76: * Creates a new handler. 77: */ 78: public GradientPaintReadHandler() { 79: super(); 80: } 81: 82: /** 83: * Returns the gradient paint under construction. 84: * 85: * @return the gradient paint. 86: */ 87: public Object getObject() { 88: return this.gradient; 89: } 90: 91: /** 92: * Returns the handler for a child element. 93: * 94: * @param tagName the tag name. 95: * @param atts the attributes. 96: * 97: * @return the handler. 98: * @throws SAXException to indicate a parsing error. 99: * @throws XmlReaderException if there is a reader error. 100: */ 101: protected XmlReadHandler getHandlerForChild(final String tagName, final Attributes atts) 102: throws SAXException, XmlReaderException { 103: if ("color1".equals(tagName)) { 104: this.color1Handler = getRootHandler().createHandler(Color.class, tagName, atts); 105: return this.color1Handler; 106: } 107: else if ("color2".equals(tagName)) { 108: this.color2Handler = getRootHandler().createHandler(Color.class, tagName, atts); 109: return this.color2Handler; 110: } 111: else if ("point1".equals(tagName)) { 112: this.point1Handler = getRootHandler().createHandler(Point2D.class, tagName, atts); 113: return this.point1Handler; 114: } 115: else if ("point2".equals(tagName)) { 116: this.point2Handler = getRootHandler().createHandler(Point2D.class, tagName, atts); 117: return this.point2Handler; 118: } 119: return null; 120: } 121: 122: /** 123: * At the end of parsing the element, the gradient paint is constructed. 124: * 125: * @throws XmlReaderException if there is a parsing error. 126: */ 127: protected void doneParsing() throws XmlReaderException { 128: if (this.point1Handler == null || this.point2Handler == null 129: || this.color1Handler == null || this.color2Handler == null) { 130: throw new XmlReaderException("Not all required subelements are defined."); 131: } 132: this.gradient = new GradientPaint 133: ((Point2D) this.point1Handler.getObject(), 134: (Color) this.color1Handler.getObject(), 135: (Point2D) this.point2Handler.getObject(), 136: (Color) this.color2Handler.getObject()); 137: } 138: 139: }