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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/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: * RootHandler.java 29: * ---------------- 30: * (C) Copyright 2003-2007, by Object Refinery Limited and Contributors. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 23-Jan-2003 : Version 1 (DG); 38: * 39: */ 40: 41: package org.jfree.data.xml; 42: 43: import java.util.Stack; 44: 45: import org.xml.sax.SAXException; 46: import org.xml.sax.helpers.DefaultHandler; 47: 48: /** 49: * A SAX handler that delegates work to sub-handlers. 50: */ 51: public class RootHandler extends DefaultHandler implements DatasetTags { 52: 53: /** The sub-handlers. */ 54: private Stack subHandlers; 55: 56: /** 57: * Creates a new handler. 58: */ 59: public RootHandler() { 60: this.subHandlers = new Stack(); 61: } 62: 63: /** 64: * Returns the stack of sub handlers. 65: * 66: * @return The sub-handler stack. 67: */ 68: public Stack getSubHandlers() { 69: return this.subHandlers; 70: } 71: 72: /** 73: * Receives some (or all) of the text in the current element. 74: * 75: * @param ch character buffer. 76: * @param start the start index. 77: * @param length the length of the valid character data. 78: * 79: * @throws SAXException for errors. 80: */ 81: public void characters(char[] ch, int start, int length) 82: throws SAXException { 83: DefaultHandler handler = getCurrentHandler(); 84: if (handler != this) { 85: handler.characters(ch, start, length); 86: } 87: } 88: 89: /** 90: * Returns the handler at the top of the stack. 91: * 92: * @return The handler. 93: */ 94: public DefaultHandler getCurrentHandler() { 95: DefaultHandler result = this; 96: if (this.subHandlers != null) { 97: if (this.subHandlers.size() > 0) { 98: Object top = this.subHandlers.peek(); 99: if (top != null) { 100: result = (DefaultHandler) top; 101: } 102: } 103: } 104: return result; 105: } 106: 107: /** 108: * Pushes a sub-handler onto the stack. 109: * 110: * @param subhandler the sub-handler. 111: */ 112: public void pushSubHandler(DefaultHandler subhandler) { 113: this.subHandlers.push(subhandler); 114: } 115: 116: /** 117: * Pops a sub-handler from the stack. 118: * 119: * @return The sub-handler. 120: */ 121: public DefaultHandler popSubHandler() { 122: return (DefaultHandler) this.subHandlers.pop(); 123: } 124: 125: }