001    /**
002     * Java Gui Builder - A library to build GUIs using an XML file.
003     * Copyright 2002, 2003 (C) François Beausoleil
004     *
005     * This library is free software; you can redistribute it and/or
006     * modify it under the terms of the GNU Lesser General Public
007     * License as published by the Free Software Foundation; either
008     * version 2.1 of the License, or (at your option) any later version.
009     *
010     * This library is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
013     * Lesser General Public License for more details.
014     *
015     * You should have received a copy of the GNU Lesser General Public
016     * License along with this library; if not, write to the Free Software
017     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
018     */
019    
020    package jgb.handlers.swing;
021    
022    import jgb.builder.TagHandler;
023    import org.xml.sax.SAXException;
024    
025    import java.util.Map;
026    
027    /**
028     * @since 0.1a
029     * @author Francois Beausoleil, <a href="mailto:fbos@users.sourceforge.net">fbos@users.sourceforge.net</a>
030     */
031    public class ConstraintsTagHandler extends AbstractTagHandler {
032        /**
033         * The name of the reset attribute.
034         */
035        protected static final String ATTR_RESET = "reset";
036    
037        private static final String EMPTY_KEY = TagHandler.CURRENT_CONSTRAINTS_KEY + ".empty";
038    
039        protected void enterElement(Map atts) throws SAXException {
040            if (atts.containsKey(ATTR_RESET)) {
041                tagContext.remove(TagHandler.CURRENT_CONSTRAINTS_KEY);
042                tagContext.put(EMPTY_KEY, "true");
043            }
044        }
045    
046        public void exitElement() throws SAXException {
047            if (tagContext.containsKey(EMPTY_KEY)) {
048                tagContext.remove(EMPTY_KEY);
049            } else {
050                tagContext.put(TagHandler.CURRENT_CONSTRAINTS_KEY,
051                        tagContext.get(TagHandler.PARAMETER_VALUE_KEY));
052            }
053    
054            tagContext.remove(TagHandler.PARAMETER_CLASS_KEY);
055            tagContext.remove(TagHandler.PARAMETER_VALUE_KEY);
056        }
057    }