Source for gnu.javax.swing.text.html.parser.support.parameterDefaulter

   1: /* parameterDefaulter.java --
   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.support;
  40: 
  41: import gnu.javax.swing.text.html.parser.htmlAttributeSet;
  42: 
  43: import java.util.Hashtable;
  44: 
  45: import javax.swing.text.html.parser.AttributeList;
  46: import javax.swing.text.html.parser.DTD;
  47: import javax.swing.text.html.parser.Element;
  48: 
  49: /**
  50:  * Returns an attribute set, containing default
  51:  * parameters for the given element. Caches sets of default
  52:  * parameters.
  53:  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  54:  */
  55: public class parameterDefaulter
  56: {
  57:   public final DTD dtd;
  58:   Hashtable sets = new Hashtable();
  59: 
  60:   /**
  61:    * Create a parameterDefaulter that looks for the default attribute
  62:    * values in the given DTD.
  63:    * @param a_dtd
  64:    */
  65:   public parameterDefaulter(DTD a_dtd)
  66:   {
  67:     dtd = a_dtd;
  68:   }
  69: 
  70:   /**
  71:    * Get the default parameter set for the given element.
  72:    * @param element The element name (case insensitive).
  73:    * @return the default attrbute set.
  74:    */
  75:   public htmlAttributeSet getDefaultParameters(String element)
  76:   {
  77:     String key = element.toLowerCase();
  78:     htmlAttributeSet atts = (htmlAttributeSet) sets.get(key);
  79: 
  80:     if (atts == null)
  81:       {
  82:         htmlAttributeSet set = new htmlAttributeSet();
  83:         Element e = dtd.elementHash.get(element.toLowerCase());
  84: 
  85:         if (e != null)
  86:           {
  87:             AttributeList a = e.getAttributes();
  88: 
  89:             while (a != null)
  90:               {
  91:                 if (a.value != null)
  92:                   set.addAttribute(a.name, a.value);
  93:                 a = a.next;
  94:               }
  95:           }
  96: 
  97:         if (set.getAttributeCount() > 0)
  98:           sets.put(key, set);
  99:         else
 100:           sets.put(key, htmlAttributeSet.EMPTY_HTML_ATTRIBUTE_SET);
 101: 
 102:         atts = set;
 103:       }
 104:     return atts;
 105:   }
 106: }