libjava/classpath/javax/swing/text/html/ObjectView.java

   1 /* ObjectView.java -- A view for HTML object tags
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.swing.text.html;
  40
  41 import java.awt.Component;
  42
  43 import javax.swing.text.AttributeSet;
  44 import javax.swing.text.ComponentView;
  45 import javax.swing.text.Element;
  46
  47 /**
  48  * A view for HTML <code>&lt;object&gt;</code> tags.
  49  *
  50  * This is a {@link ComponentView} that creates special components depending
  51  * on the object specification. If the object tag has a classid attribute, then
  52  * this view will try to load the class specified by this attribute using the
  53  * classloader that loaded the associated document. If the class could be
  54  * loaded, an instance is created and the type narrowed to {@link Component}.
  55  *
  56  * It is also possible to set bean properties on the created component using
  57  * nested <code>&lt;param&gt;</code> tags. For example:
  58  * <pre>
  59  * <object classid="javax.swing.JLabel">
  60  *   <param name="text" value="sample text">
  61  * </object>
  62  * </pre>
  63  *
  64  * @author Roman Kennke (kennke@aicas.com)
  65  */
  66 public class ObjectView extends ComponentView
  67 {
  68
  69   /**
  70    * Creates a new <code>ObjectView</code>.
  71    *
  72    * @param el the element for which to create a view
  73    */
  74   public ObjectView(Element el)
  75   {
  76     super(el);
  77   }
  78
  79   /**
  80    * Creates a component based on the specification in the element of this
  81    * view. See the class description for details.
  82    */
  83   protected Component createComponent()
  84   {
  85     Component comp = null;
  86     Element el = getElement();
  87     AttributeSet atts = el.getAttributes();
  88     String classId = (String) atts.getAttribute("classid");
  89     try
  90       {
  91         Class objectClass = Class.forName(classId);
  92         Object instance = objectClass.newInstance();
  93         comp = (Component) instance;
  94       }
  95     catch (ClassNotFoundException ex)
  96       {
  97         // Ignored.
  98       }
  99     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 }