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 java.awt.*;
025    import java.util.Map;
026    
027    /**
028     * @since 0.1.1a
029     * @author Francois Beausoleil, <a href="mailto:fbos@users.sourceforge.net">fbos@users.sourceforge.net</a>
030     */
031    public class LayoutTagHandler extends AbstractControlTagHandler {
032        private static final String DEFAULT_PACKAGE = "java.awt.";
033    
034        public void enterElement(Map atts) throws SAXException {
035            String className = calcControlClassName((String)atts.get(ATTR_CLASS));
036    
037            LayoutManager layout = null;
038            try {
039                Class layoutClass = Class.forName(className);
040                layout = (LayoutManager)layoutClass.newInstance();
041            } catch (ClassNotFoundException e) {
042                throwParsingException("Layout manager class not found " + className, e);
043            } catch (Exception e) {
044                throwParsingException("Could not instantiate layout manager " + className, e);
045            }
046    
047            Container parentContainer = (Container)getCurrentControl();
048            parentContainer.setLayout(layout);
049    
050            pushCurrentObject(layout);
051        }
052    
053        public void exitElement() throws SAXException {
054            popCurrentControl();
055        }
056    
057        protected String getDefaultPackagePrefix() {
058            return DEFAULT_PACKAGE;
059        }
060    }