001/* ObjectView.java -- A view for HTML object tags
002   Copyright (C) 2006 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.swing.text.html;
040
041import java.awt.Component;
042
043import javax.swing.text.AttributeSet;
044import javax.swing.text.ComponentView;
045import javax.swing.text.Element;
046
047/**
048 * A view for HTML <code>&lt;object&gt;</code> tags.
049 *
050 * This is a {@link ComponentView} that creates special components depending
051 * on the object specification. If the object tag has a classid attribute, then
052 * this view will try to load the class specified by this attribute using the
053 * classloader that loaded the associated document. If the class could be
054 * loaded, an instance is created and the type narrowed to {@link Component}.
055 *
056 * It is also possible to set bean properties on the created component using
057 * nested <code>&lt;param&gt;</code> tags. For example:
058 * <pre>
059 * <object classid="javax.swing.JLabel">
060 *   <param name="text" value="sample text">
061 * </object>
062 * </pre>
063 *
064 * @author Roman Kennke (kennke@aicas.com)
065 */
066public class ObjectView extends ComponentView
067{
068
069  /**
070   * Creates a new <code>ObjectView</code>.
071   *
072   * @param el the element for which to create a view
073   */
074  public ObjectView(Element el)
075  {
076    super(el);
077  }
078
079  /**
080   * Creates a component based on the specification in the element of this
081   * view. See the class description for details.
082   */
083  protected Component createComponent()
084  {
085    Component comp = null;
086    Element el = getElement();
087    AttributeSet atts = el.getAttributes();
088    String classId = (String) atts.getAttribute("classid");
089    try
090      {
091        Class objectClass = Class.forName(classId);
092        Object instance = objectClass.newInstance();
093        comp = (Component) instance;
094      }
095    catch (ClassNotFoundException ex)
096      {
097        // Ignored.
098      }
099    catch (IllegalAccessException ex)
100      {
101        // Ignored.
102      }
103    catch (InstantiationException ex)
104      {
105        // Ignored.
106      }
107    // FIXME: Handle param tags and set bean properties accordingly.
108    return comp;
109  }
110}