libjava/gnu/xml/dom/DomCharacterData.java

   1 /* DomCharacterData.java --
   2    Copyright (C) 1999,2000,2001,2004 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 package gnu.xml.dom;
  39
  40 import org.w3c.dom.CharacterData;
  41 import org.w3c.dom.DOMException;
  42 import org.w3c.dom.events.MutationEvent;
  43
  44
  45 /**
  46  * <p> Abstract "CharacterData" implementation.  This
  47  * facilitates reusing code in classes implementing subtypes of that DOM
  48  * interface (Text, Comment, CDATASection).  </p>
  49  *
  50  * @author David Brownell
  51  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  52  */
  53 public abstract class DomCharacterData
  54   extends DomNode
  55   implements CharacterData
  56 {
  57
  58   private String text;
  59
  60   // package private
  61   DomCharacterData(short nodeType, DomDocument doc, String value)
  62   {
  63     super(nodeType, doc);
  64     text = (value == null) ? "" : value;
  65   }
  66
  67   // package private
  68   DomCharacterData(short nodeType, DomDocument doc,
  69                    char[] buf, int offset, int length)
  70   {
  71     super(nodeType, doc);
  72     text = (buf == null) ? "" : new String(buf, offset, length);
  73   }
  74
  75   /**
  76    * <b>DOM L1</b>
  77    * Appends the specified data to the value of this node.
  78    * Causes a DOMCharacterDataModified mutation event to be reported.
  79    */
  80   public void appendData(String arg)
  81   {
  82     if (isReadonly())
  83       {
  84         throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
  85       }
  86     String value = text + arg;
  87     mutating(value);
  88     text = value;
  89   }
  90
  91   /**
  92    * <b>DOM L1</b>
  93    * Modifies the value of this node.
  94    * Causes a DOMCharacterDataModified mutation event to be reported.
  95    */
  96   public void deleteData(int offset, int count)
  97   {
  98     if (isReadonly())
  99       {
 100         throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
 101       }
 102     char[] raw = text.toCharArray();
 103     if (offset < 0 || count < 0 || offset > raw.length)
 104       {
 105         throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
 106       }
 107     if ((offset + count) > raw.length)
 108       {
 109         count = raw.length - offset;
 110       }
 111     if (count == 0)
 112       {
 113         return;
 114       }
 115     try
 116       {
 117         char[] buf = new char[raw.length - count];
 118         System.arraycopy(raw, 0, buf, 0, offset);
 119         System.arraycopy(raw, offset + count, buf, offset,
 120                          raw.length - (offset + count));
 121         String value = new String(buf);
 122         mutating(value);
 123         text = value;
 124       }
 125     catch (IndexOutOfBoundsException x)
 126       {
 127         throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
 128       }
 129   }
 130
 131   /**
 132    * <b>DOM L1</b>
 133    * Returns the value of this node.
 134    */
 135   public String getNodeValue()
 136   {
 137     return text;
 138   }
 139
 140   /**
 141    * <b>DOM L1</b>
 142    * Returns the value of this node; same as getNodeValue.
 143    */
 144   public final String getData()
 145   {
 146     return text;
 147   }
 148
 149   /**
 150    * <b>DOM L1</b>
 151    * Returns the length of the data.
 152    */
 153   public int getLength()
 154   {
 155     return text.length();
 156   }
 157
 158   /**
 159    * <b>DOM L1</b>
 160    * Modifies the value of this node.
 161    */
 162   public void insertData(int offset, String arg)
 163   {
 164     if (isReadonly())
 165       {
 166       throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
 167       }
 168     char[] raw = text.toCharArray();
 169     char[] tmp = arg.toCharArray ();
 170     char[] buf = new char[raw.length + tmp.length];
 171
 172     try
 173       {
 174         System.arraycopy(raw, 0, buf, 0, offset);
 175         System.arraycopy(tmp, 0, buf, offset, tmp.length);
 176         System.arraycopy(raw, offset, buf, offset + tmp.length,
 177                          raw.length - offset);
 178         String value = new String(buf);
 179         mutating(value);
 180         text = value;
 181       }
 182     catch (IndexOutOfBoundsException x)
 183       {
 184         throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
 185       }
 186   }
 187
 188   /**
 189    * <b>DOM L1</b>
 190    * Modifies the value of this node.  Causes DOMCharacterDataModified
 191    * mutation events to be reported (at least one).
 192    */
 193   public void replaceData(int offset, int count, String arg)
 194   {
 195     if (readonly)
 196       {
 197         throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
 198       }
 199     char[] raw = text.toCharArray();
 200
 201     // deleteData
 202     if (offset < 0 || count < 0 || offset > raw.length)
 203       {
 204         throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
 205       }
 206     if ((offset + count) > raw.length)
 207       {
 208         count = raw.length - offset;
 209       }
 210     try
 211       {
 212         char[] buf = new char[raw.length - count];
 213         System.arraycopy(raw, 0, buf, 0, offset);
 214         System.arraycopy(raw, offset + count, buf, offset,
 215                          raw.length - (offset + count));
 216
 217         // insertData
 218         char[] tmp = arg.toCharArray ();
 219         char[] buf2 = new char[buf.length + tmp.length];
 220         System.arraycopy(raw, 0, buf, 0, offset);
 221         System.arraycopy(tmp, 0, buf, offset, tmp.length);
 222         System.arraycopy(raw, offset, buf, offset + tmp.length,
 223                          raw.length - offset);
 224         String value = new String(buf);
 225         mutating(value);
 226         text = value;
 227       }
 228     catch (IndexOutOfBoundsException x)
 229       {
 230         throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
 231       }
 232   }
 233
 234   /**
 235    * <b>DOM L1</b>
 236    * Assigns the value of this node.
 237    * Causes a DOMCharacterDataModified mutation event to be reported.
 238    */
 239   public void setNodeValue(String value)
 240   {
 241     if (isReadonly())
 242       {
 243         throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
 244       }
 245     if (value == null)
 246       {
 247         value = "";
 248       }
 249     mutating(value);
 250     text = value;
 251   }
 252
 253   /**
 254    * <b>DOM L1</b>
 255    * Assigns the value of this node; same as setNodeValue.
 256    */
 257   final public void setData(String data)
 258   {
 259     setNodeValue(data);
 260   }
 261
 262   /**
 263    * <b>DOM L1</b>
 264    * Returns the specified substring.
 265    */
 266   public String substringData(int offset, int count)
 267   {
 268     try
 269       {
 270         return text.substring(offset, count);
 271       }
 272     catch (StringIndexOutOfBoundsException e)
 273       {
 274         if (offset >= 0 && count >= 0 && offset < text.length())
 275           {
 276             return text.substring(offset);
 277           }
 278         throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
 279       }
 280   }
 281
 282   /**
 283    * The base URI for character data is <code>null</code>.
 284    * @since DOM Level 3 Core
 285    */
 286   public final String getBaseURI()
 287   {
 288     return null;
 289   }
 290
 291   private void mutating(String newValue)
 292   {
 293     if (!reportMutations)
 294       {
 295         return;
 296       }
 297
 298     // EVENT:  DOMCharacterDataModified, target = this,
 299     //  prev/new values provided
 300     MutationEvent  event;
 301
 302     event = (MutationEvent) createEvent("MutationEvents");
 303     event.initMutationEvent("DOMCharacterDataModified",
 304                             true /* bubbles */, false /* nocancel */,
 305                             null, text, newValue, null, (short) 0);
 306     dispatchEvent(event);
 307   }
 308
 309 }
 310