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 org.xml.sax.SAXException;
023    
024    import javax.swing.*;
025    import java.awt.*;
026    import java.util.Map;
027    
028    /**
029     * @since v0.3.1a
030     * @author Francois Beausoleil, <a href="mailto:fbos@users.sourceforge.net">fbos@users.sourceforge.net</a>
031     */
032    public class GlueTagHandler extends AbstractControlTagHandler {
033        /**
034         * The name of the orientation attribute.
035         */
036        protected static final String ATTR_ORIENTATION = "orientation";
037    
038        /**
039         * The search key that means the user wants a horizontal glue.
040         */
041        protected static final String HORIZ_PREFIX = "horiz";
042    
043        /**
044         * The search key that means the user wants a horizontal glue.
045         */
046        protected static final String VERT_PREFIX = "vert";
047    
048        protected void enterElement(Map atts) throws SAXException {
049            Component comp = null;
050            final String orientation = ((String)atts.get(ATTR_ORIENTATION));
051            if (orientation.startsWith(HORIZ_PREFIX)) {
052                comp = Box.createHorizontalGlue();
053            } else if (orientation.startsWith(VERT_PREFIX)) {
054                comp = Box.createVerticalGlue();
055            } else {
056                Exception e = new IllegalArgumentException(
057                        ATTR_ORIENTATION + " attribute does not accept " +
058                        "value '" + atts.get(ATTR_ORIENTATION) + "'");
059                throwParsingException(e);
060            }
061    
062            // This also adds the control to the parent
063            pushCurrentControl(comp);
064        }
065    
066        protected void exitElement() throws SAXException {
067            popCurrentControl();
068        }
069    
070        protected String getDefaultPackagePrefix() {
071            throw new IllegalStateException();
072        }
073    }