/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/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.]
*
* ----------------
* RootHandler.java
* ----------------
* (C) Copyright 2003-2007, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 23-Jan-2003 : Version 1 (DG);
*
*/
package org.jfree.data.xml;
import java.util.Stack;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* A SAX handler that delegates work to sub-handlers.
*/
public class RootHandler extends DefaultHandler implements DatasetTags {
/** The sub-handlers. */
private Stack subHandlers;
/**
* Creates a new handler.
*/
public RootHandler() {
this.subHandlers = new Stack();
}
/**
* Returns the stack of sub handlers.
*
* @return The sub-handler stack.
*/
public Stack getSubHandlers() {
return this.subHandlers;
}
/**
* Receives some (or all) of the text in the current element.
*
* @param ch character buffer.
* @param start the start index.
* @param length the length of the valid character data.
*
* @throws SAXException for errors.
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
DefaultHandler handler = getCurrentHandler();
if (handler != this) {
handler.characters(ch, start, length);
}
}
/**
* Returns the handler at the top of the stack.
*
* @return The handler.
*/
public DefaultHandler getCurrentHandler() {
DefaultHandler result = this;
if (this.subHandlers != null) {
if (this.subHandlers.size() > 0) {
Object top = this.subHandlers.peek();
if (top != null) {
result = (DefaultHandler) top;
}
}
}
return result;
}
/**
* Pushes a sub-handler onto the stack.
*
* @param subhandler the sub-handler.
*/
public void pushSubHandler(DefaultHandler subhandler) {
this.subHandlers.push(subhandler);
}
/**
* Pops a sub-handler from the stack.
*
* @return The sub-handler.
*/
public DefaultHandler popSubHandler() {
return (DefaultHandler) this.subHandlers.pop();
}
}
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