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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.

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/* ========================================================================
 * 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.]
 * 
 * -------------------
 * XmlReadHandler.java
 * -------------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: XmlReadHandler.java,v 1.3 2005/10/18 13:32:52 mungady Exp $
 *
 * Changes (from 25-Nov-2003)
 * --------------------------
 * 25-Nov-2003 : Added Javadocs (DG);
 *  
 */

package org.jfree.xml.parser;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

/**
 * A handler for reading an XML element.
 */
public interface XmlReadHandler {
    
    /**
     * This method is called at the start of an element.
     * 
     * @param tagName  the tag name.
     * @param attrs  the attributes.
     * 
     * @throws SAXException if there is a parsing error.
     * @throws XmlReaderException if there is a reader error.
     */
    public void startElement(String tagName, Attributes attrs)
        throws SAXException, XmlReaderException;
    
    /**
     * This method is called to process the character data between element tags.
     * 
     * @param ch  the character buffer.
     * @param start  the start index.
     * @param length  the length.
     * 
     * @throws SAXException if there is a parsing error.
     */
    public void characters(char[] ch, int start, int length)
        throws SAXException;
    
    /**
     * This method is called at the end of an element.
     * 
     * @param tagName  the tag name.
     * 
     * @throws SAXException if there is a parsing error.
     * @throws XmlReaderException if there is a reader error.
     */
    public void endElement(String tagName)
        throws SAXException, XmlReaderException;
    
    /**
     * Returns the object for this element or null, if this element does
     * not create an object.
     * 
     * @return the object.
     * 
     * @throws XmlReaderException if there is a parsing error.
     */
    public Object getObject() throws XmlReaderException;
    
    /**
     * Initialise.
     * 
     * @param rootHandler  the root handler.
     * @param tagName  the tag name.
     */
    public void init(RootXmlReadHandler rootHandler, String tagName);

}