Source for gnu.javax.swing.text.html.parser.htmlAttributeSet

   1: /* htmlAttributeSet.java -- A set to store HTML attributes
   2:    Copyright (C) 2005 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 gnu.javax.swing.text.html.parser;
  40: 
  41: import java.util.Enumeration;
  42: 
  43: import javax.swing.text.AttributeSet;
  44: import javax.swing.text.SimpleAttributeSet;
  45: import javax.swing.text.html.HTML;
  46: 
  47: /**
  48:  * A set, adapted to store HTML attributes.
  49:  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  50:  */
  51: public class htmlAttributeSet
  52:   extends SimpleAttributeSet
  53: {
  54:   public static final htmlAttributeSet EMPTY_HTML_ATTRIBUTE_SET =
  55:     new htmlAttributeSet();
  56:   AttributeSet parent;
  57: 
  58:   /**
  59:    * Looks in this set and, if not found, later looks in the parent set.
  60:    * Calls toString(), allowing to pass as HTML.Attribute, as String
  61:    * to this method.
  62:    * @param key A key to search for a value.
  63:    * @return The value, if one is defined.
  64:    */
  65:   public Object getAttribute(Object _key)
  66:   {
  67:     Object key = _key.toString().toLowerCase();
  68: 
  69:     Object v = super.getAttribute(key);
  70:     if (v != null)
  71:       return v;
  72:     else if (parent != null)
  73:       return parent.getAttribute(key);
  74:     else
  75:       return null;
  76:   }
  77: 
  78:   /**
  79:    * The name set must return HTML.Attribute and not a string,
  80:    * where applicable.
  81:    */
  82:   public Enumeration getAttributeNames()
  83:   {
  84:     // Replace the string keys by HTML.attribute, where applicable
  85:     final Enumeration enumeration = super.getAttributeNames();
  86: 
  87:     return new Enumeration()
  88:       {
  89:         public boolean hasMoreElements()
  90:         {
  91:           return enumeration.hasMoreElements();
  92:         }
  93: 
  94:         public Object nextElement()
  95:         {
  96:           Object key = enumeration.nextElement();
  97:           HTML.Attribute hKey = HTML.getAttributeKey((String) key);
  98:           if (hKey != null)
  99:             return hKey;
 100:           else
 101:             return key;
 102:         }
 103:       };
 104:   }
 105: 
 106:   /**
 107:    * Set the parent set, containing the default values.
 108:    * @param a_parent
 109:    */
 110:   public void setResolveParent(AttributeSet a_parent)
 111:   {
 112:     parent = a_parent;
 113:   }
 114: 
 115:   /**
 116:    * Get the parent set, containing the default values.
 117:    * @return
 118:    */
 119:   public AttributeSet getResolveParent()
 120:   {
 121:     return parent;
 122:   }
 123: 
 124:   /**
 125:    * Add the attribute to this attribute set.
 126:    * @param key Attribute key (will be case insensitive)
 127:    * @param value Attribute value
 128:    */
 129:   public void addAttribute(Object key, Object value)
 130:   {
 131:     super.addAttribute(key.toString().toLowerCase(), value);
 132:   }
 133: }