elementdefinitionhandler.java

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/* ===================================================
 * JCommon : a free general purpose Java class library
 * ===================================================
 *
 * Project Info:  http://www.object-refinery.com/jcommon/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ----------------------------
 * ElementDefinitionHandler.java
 * ----------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: ElementDefinitionHandler.java,v 1.3 2003/06/03 21:56:52 mungady Exp $
 *
 * Changes
 * -------
 * 21-Feb-2003 : Added standard header and Javadocs (DG);
 * 29-Apr-2003 : Destilled from the JFreeReport project and moved into JCommon
 *
 */

package org.jfree.xml;

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

/**
 * A element definition handler. The element definition handler is used to
 * represent a certain parser state. The current state is set in the parser
 * using the pushFactory() method. The parser forwards any incoming SAXEvent
 * to the current handler, until the handler is removed with popFactory().
 *
 * @author Thomas Morgner
 */
public interface ElementDefinitionHandler {

    /**
     * Callback to indicate that an XML element start tag has been read by the parser.
     *
     * @param tagName  the tag name.
     * @param attrs  the attributes.
     *
     * @throws SAXException if a parser error occurs or the validation failed.
     */
    public void startElement(String tagName, Attributes attrs) throws SAXException;

    /**
     * Callback to indicate that some character data has been read.
     *
     * @param ch  the character array.
     * @param start  the start index for the characters.
     * @param length  the length of the character sequence.
     * @throws SAXException if a parser error occurs or the validation failed.
     */
    public void characters(char ch[], int start, int length) throws SAXException;

    /**
     * Callback to indicate that an XML element end tag has been read by the parser.
     *
     * @param tagName  the tag name.
     *
     * @throws SAXException if a parser error occurs or the validation failed.
     */
    public void endElement(String tagName) throws SAXException;

    /**
     * Returns the parser.
     *
     * @return The parser.
     */
    public Parser getParser();

}