Source for javax.swing.text.html.ObjectView

   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: }