libjava/javax/swing/text/SimpleAttributeSet.java

   1 /* SimpleAttributeSet.java --
   2    Copyright (C) 2004 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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;
  40
  41 import java.io.Serializable;
  42 import java.util.Enumeration;
  43 import java.util.Hashtable;
  44
  45 public class SimpleAttributeSet
  46   implements MutableAttributeSet, Serializable, Cloneable
  47 {
  48   public static final AttributeSet EMPTY = new SimpleAttributeSet();
  49
  50   Hashtable tab;
  51
  52   public SimpleAttributeSet()
  53   {
  54     this(null);
  55   }
  56
  57   public SimpleAttributeSet(AttributeSet a)
  58   {
  59     tab = new Hashtable();
  60     if (a != null)
  61       addAttributes(a);
  62   }
  63
  64   public void addAttribute(Object name, Object value)
  65   {
  66     tab.put(name, value);
  67   }
  68
  69   public void addAttributes(AttributeSet attributes)
  70   {
  71     Enumeration e = attributes.getAttributeNames();
  72     while (e.hasMoreElements())
  73       {
  74         Object name = e.nextElement();
  75         Object val = attributes.getAttribute(name);
  76         tab.put(name, val);
  77       }
  78   }
  79
  80   public Object clone()
  81   {
  82     SimpleAttributeSet s = new SimpleAttributeSet();
  83     s.tab = (Hashtable) tab.clone();
  84     return s;
  85   }
  86
  87   public boolean containsAttribute(Object name, Object value)
  88   {
  89     return tab.containsKey(name)
  90       && tab.get(name).equals(value);
  91   }
  92
  93   public boolean containsAttributes(AttributeSet attributes)
  94   {
  95     Enumeration e = attributes.getAttributeNames();
  96     while (e.hasMoreElements())
  97       {
  98         Object name = e.nextElement();
  99         Object val = attributes.getAttribute(name);
 100         if (! containsAttribute(name, val))
 101           return false;
 102       }
 103     return true;
 104   }
 105
 106   public AttributeSet copyAttributes()
 107   {
 108     return (AttributeSet) clone();
 109   }
 110
 111   public boolean equals(Object obj)
 112   {
 113     return (obj != null)
 114       && (obj instanceof SimpleAttributeSet)
 115       && ((SimpleAttributeSet)obj).tab.equals(this.tab);
 116   }
 117
 118   public Object getAttribute(Object name)
 119   {
 120     Object val = tab.get(name);
 121     if (val != null)
 122       return val;
 123
 124     Object p = getResolveParent();
 125     if (p != null && p instanceof AttributeSet)
 126       return (((AttributeSet)p).getAttribute(name));
 127
 128     return null;
 129   }
 130
 131   public int getAttributeCount()
 132   {
 133     return tab.size();
 134   }
 135
 136   public Enumeration getAttributeNames()
 137   {
 138     return tab.keys();
 139   }
 140
 141   public AttributeSet getResolveParent()
 142   {
 143     return (AttributeSet) tab.get(ResolveAttribute);
 144   }
 145
 146   public int hashCode()
 147   {
 148     return tab.hashCode();
 149   }
 150
 151   public boolean isDefined(Object attrName)
 152   {
 153     return tab.containsKey(attrName);
 154   }
 155
 156   public boolean isEmpty()
 157   {
 158     return tab.isEmpty();
 159   }
 160
 161   public boolean isEqual(AttributeSet attr)
 162   {
 163     return this.equals(attr);
 164   }
 165
 166   public void removeAttribute(Object name)
 167   {
 168     tab.remove(name);
 169   }
 170
 171   public void removeAttributes(AttributeSet attributes)
 172   {
 173     removeAttributes(attributes.getAttributeNames());
 174   }
 175
 176   public void removeAttributes(Enumeration names)
 177   {
 178     while (names.hasMoreElements())
 179       {
 180         removeAttribute(names.nextElement());
 181       }
 182   }
 183
 184   public void setResolveParent(AttributeSet parent)
 185   {
 186     addAttribute(ResolveAttribute, parent);
 187   }
 188
 189   public String toString()
 190   {
 191     return tab.toString();
 192   }
 193 }