summaryrefslogtreecommitdiff
path: root/libjava/classpath/gnu/xml/dom/DomElement.java
blob: 429749978a3f9019555c1d7f8f94b0d636d4f9fc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
/* DomElement.java --
   Copyright (C) 1999,2000,2001,2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package gnu.xml.dom;

import java.util.HashSet;
import java.util.Set;
import javax.xml.XMLConstants;

import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.TypeInfo;

/**
 * <p> "Element" implementation.
 *
 * @author David Brownell
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
public class DomElement
  extends DomNsNode
  implements Element
{

  /**
   * User-defined ID attributes.
   * Used by DomAttr.isId and DomDocument.getElementById
   */
  Set userIdAttrs;

  // Attributes are VERY expensive in DOM, and not just for
  // this implementation.  Avoid creating them.
  private DomNamedNodeMap attributes;

  // xml:space cache
  String xmlSpace = "";

  /**
   * Constructs an Element node associated with the specified document.
   *
   * <p>This constructor should only be invoked by a Document as part
   * of its createElement functionality, or through a subclass which is
   * similarly used in a "Sub-DOM" style layer.
   *
   * @param owner The document with which this node is associated
   * @param namespaceURI Combined with the local part of the name,
   *    this is used to uniquely identify a type of element
   * @param name Name of this element, which may include a prefix
   */
  protected DomElement(DomDocument owner, String namespaceURI, String name)
  {
    super(ELEMENT_NODE, owner, namespaceURI, name);
  }

  /**
   * <p>
   * Constructs an Element node associated with the specified document.
   * This constructor should only be invoked by a Document as part
   * of its createElement functionality, or through a subclass which is
   * similarly used in a "Sub-DOM" style layer.
   * </p>
   * <p>
   * With this constructor, the prefix and local part are given explicitly
   * rather than being computed.  This allows them to be explicitly set to
   * {@code null} as required by {@link Document#createElement(String)}.
   * </p>
   *
   * @param owner The document with which this node is associated
   * @param namespaceURI Combined with the local part of the name,
   *    this is used to uniquely identify a type of element
   * @param name Name of this element, which may include a prefix
   * @param prefix the namespace prefix of the name.  May be {@code null}.
   * @param localName the local part of the name.  May be {@code null}.
   */
  protected DomElement(DomDocument owner, String namespaceURI, String name,
                       String prefix, String localName)
  {
    super(ELEMENT_NODE, owner, namespaceURI, name, prefix, localName);
  }

  /**
   * <b>DOM L1</b>
   * Returns the element's attributes
   */
  public NamedNodeMap getAttributes()
  {
    if (attributes == null)
      {
        attributes = new DomNamedNodeMap(this, Node.ATTRIBUTE_NODE);
      }
    return attributes;
  }

  /**
   * <b>DOM L2></b>
   * Returns true iff this is an element node with attributes.
   */
  public boolean hasAttributes()
  {
    return attributes != null && attributes.length != 0;
  }

  /**
   * Shallow clone of the element, except that associated
   * attributes are (deep) cloned.
   */
  public Object clone()
  {
    DomElement node = (DomElement) super.clone();

    if (attributes != null)
      {
        node.attributes = new DomNamedNodeMap(node, Node.ATTRIBUTE_NODE);
        for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
          {
            node.attributes.setNamedItem(ctx.cloneNode(true), true, true);
          }
      }
    return node;
  }

  void setOwner(DomDocument doc)
  {
    if (attributes != null)
      {
        for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
          {
            ctx.setOwner(doc);
          }
      }
    super.setOwner(doc);
  }

  /**
   * Marks this element, its children, and its associated attributes as
   * readonly.
   */
  public void makeReadonly()
  {
    super.makeReadonly();
    if (attributes != null)
      {
        attributes.makeReadonly();
      }
  }

  /**
   * <b>DOM L1</b>
   * Returns the element name (same as getNodeName).
   */
  final public String getTagName()
  {
    return getNodeName();
  }

  /**
   * <b>DOM L1</b>
   * Returns the value of the specified attribute, or an
   * empty string.
   */
  public String getAttribute(String name)
  {
    if ("xml:space" == name) // NB only works on interned string
      {
        // Use cached value
        return xmlSpace;
      }
    Attr attr = getAttributeNode(name);
    return (attr == null) ? "" : attr.getValue();
  }

  /**
   * <b>DOM L2</b>
   * Returns true if the element has an attribute with the
   * specified name (specified or DTD defaulted).
   */
  public boolean hasAttribute(String name)
  {
    return getAttributeNode(name) != null;
  }

  /**
   * <b>DOM L2</b>
   * Returns true if the element has an attribute with the
   * specified name (specified or DTD defaulted).
   */
  public boolean hasAttributeNS(String namespaceURI, String local)
  {
    return getAttributeNodeNS(namespaceURI, local) != null;
  }

  /**
   * <b>DOM L2</b>
   * Returns the value of the specified attribute, or an
   * empty string.
   */
  public String getAttributeNS(String namespaceURI, String local)
  {
    Attr attr = getAttributeNodeNS(namespaceURI, local);
    return (attr == null) ? "" : attr.getValue();
  }

  /**
   * <b>DOM L1</b>
   * Returns the appropriate attribute node; the name is the
   * nodeName property of the attribute.
   */
  public Attr getAttributeNode(String name)
  {
    return (attributes == null) ? null :
      (Attr) attributes.getNamedItem(name);
  }

  /**
   * <b>DOM L2</b>
   * Returns the appropriate attribute node; the name combines
   * the namespace name and the local part.
   */
  public Attr getAttributeNodeNS(String namespace, String localPart)
  {
    return (attributes == null) ? null :
      (Attr) attributes.getNamedItemNS(namespace, localPart);
  }

  /**
   * <b>DOM L1</b>
   * Modifies an existing attribute to have the specified value,
   * or creates a new one with that value.  The name used is the
   * nodeName value.
   */
  public void setAttribute(String name, String value)
  {
    Attr attr = getAttributeNode(name);
    if (attr != null)
      {
        attr.setNodeValue(value);
        ((DomAttr) attr).setSpecified(true);
        return;
      }
    attr = owner.createAttribute(name);
    attr.setNodeValue(value);
    setAttributeNode(attr);
  }

  /**
   * <b>DOM L2</b>
   * Modifies an existing attribute to have the specified value,
   * or creates a new one with that value.
   */
  public void setAttributeNS(String uri, String aname, String value)
  {
    if (("xmlns".equals (aname) || aname.startsWith ("xmlns:"))
        && !XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals (uri))
      {
        throw new DomDOMException(DOMException.NAMESPACE_ERR,
                        "setting xmlns attribute to illegal value", this, 0);
      }

    Attr attr = getAttributeNodeNS(uri, aname);
    if (attr != null)
      {
        attr.setNodeValue(value);
        return;
      }
    attr = owner.createAttributeNS(uri, aname);
    attr.setNodeValue(value);
    setAttributeNodeNS(attr);
  }

  /**
   * <b>DOM L1</b>
   * Stores the specified attribute, optionally overwriting any
   * existing one with that name.
   */
  public Attr setAttributeNode(Attr attr)
  {
    return (Attr) getAttributes().setNamedItem(attr);
  }

  /**
   * <b>DOM L2</b>
   * Stores the specified attribute, optionally overwriting any
   * existing one with that name.
   */
  public Attr setAttributeNodeNS(Attr attr)
  {
    return (Attr) getAttributes().setNamedItemNS(attr);
  }

  /**
   * <b>DOM L1</b>
   * Removes the appropriate attribute node.
   * If there is no such node, this is (bizarrely enough) a NOP so you
   * won't see exceptions if your code deletes non-existent attributes.
   *
   * <p>Note that since there is no portable way for DOM to record
   * DTD information, default values for attributes will never be
   * provided automatically.
   */
  public void removeAttribute(String name)
  {
    if (attributes == null)
      {
        return;
      }

    try
      {
        attributes.removeNamedItem(name);
      }
    catch (DomDOMException e)
      {
        if (e.code != DOMException.NOT_FOUND_ERR)
          {
            throw e;
          }
      }
  }

  /**
   * <b>DOM L1</b>
   * Removes the appropriate attribute node; the name is the
   * nodeName property of the attribute.
   *
   * <p>Note that since there is no portable way for DOM to record
   * DTD information, default values for attributes will never be
   * provided automatically.
   */
  public Attr removeAttributeNode(Attr node)
  {
    if (attributes == null)
      {
        throw new DomDOMException(DOMException.NOT_FOUND_ERR, null, node, 0);
      }
    return (Attr) attributes.removeNamedItem(node.getNodeName());
  }

  /**
   * <b>DOM L2</b>
   * Removes the appropriate attribute node; the name combines
   * the namespace name and the local part.
   *
   * <p>Note that since there is no portable way for DOM to record
   * DTD information, default values for attributes will never be
   * provided automatically.
   */
  public void removeAttributeNS(String namespace, String localPart)
  {
    if (attributes == null)
      {
        throw new DomDOMException(DOMException.NOT_FOUND_ERR, localPart, null, 0);
      }
    attributes.removeNamedItemNS (namespace, localPart);
  }

  // DOM Level 3 methods

  public String lookupPrefix(String namespaceURI)
  {
    if (namespaceURI == null)
      {
        return null;
      }
    String namespace = getNamespaceURI();
    if (namespace != null && namespace.equals(namespaceURI))
      {
        return getPrefix();
      }
    if (attributes != null)
      {
        for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
          {
            if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
                .equals(ctx.getNamespaceURI()))
              {
                String value = ctx.getNodeValue();
                if (value.equals(namespaceURI))
                  {
                    return ctx.getLocalName();
                  }
              }
          }
      }
    return super.lookupPrefix(namespaceURI);
  }

  public boolean isDefaultNamespace(String namespaceURI)
  {
    String namespace = getNamespaceURI();
    if (namespace != null && namespace.equals(namespaceURI))
      {
        return getPrefix() == null;
      }
    if (attributes != null)
      {
        for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
          {
            if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
                .equals(ctx.getNamespaceURI()))
              {
                String qName = ctx.getNodeName();
                return (XMLConstants.XMLNS_ATTRIBUTE.equals(qName));
              }
          }
      }
    return super.isDefaultNamespace(namespaceURI);
  }

  public String lookupNamespaceURI(String prefix)
  {
    String namespace = getNamespaceURI();
    if (namespace != null && equal(prefix, getPrefix()))
      {
        return namespace;
      }
    if (attributes != null)
      {
        for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
          {
            if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
                .equals(ctx.getNamespaceURI()))
              {
                if (prefix == null)
                  {
                    if (XMLConstants.XMLNS_ATTRIBUTE.equals(ctx.getNodeName()))
                      {
                        return ctx.getNodeValue();
                      }
                  }
                else
                  {
                    if (prefix.equals(ctx.getLocalName()))
                      {
                        return ctx.getNodeValue();
                      }
                  }
              }
          }
      }
    return super.lookupNamespaceURI(prefix);
  }

  public String getBaseURI()
  {
    if (attributes != null)
      {
        Node xmlBase =
          attributes.getNamedItemNS(XMLConstants.XML_NS_URI, "base");
        if (xmlBase != null)
          {
            return xmlBase.getNodeValue();
          }
      }
    return super.getBaseURI();
  }

  public TypeInfo getSchemaTypeInfo()
  {
    // DTD implementation
    DomDoctype doctype = (DomDoctype) owner.getDoctype();
    if (doctype != null)
      {
        return doctype.getElementTypeInfo(getNodeName());
      }
    // TODO XML Schema implementation
    return null;
  }

  public void setIdAttribute(String name, boolean isId)
  {
    NamedNodeMap attrs = getAttributes();
    Attr attr = (Attr) attrs.getNamedItem(name);
    setIdAttributeNode(attr, isId);
  }

  public void setIdAttributeNode(Attr attr, boolean isId)
  {
    if (readonly)
      {
        throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
      }
    if (attr == null || attr.getOwnerElement() != this)
      {
        throw new DomDOMException(DOMException.NOT_FOUND_ERR);
      }
    if (isId)
      {
        if (userIdAttrs == null)
          {
            userIdAttrs = new HashSet();
          }
        userIdAttrs.add(attr);
      }
    else if (userIdAttrs != null)
      {
        userIdAttrs.remove(attr);
        if (userIdAttrs.isEmpty())
          {
            userIdAttrs = null;
          }
      }
  }

  public void setIdAttributeNS(String namespaceURI, String localName,
                               boolean isId)
  {
    NamedNodeMap attrs = getAttributes();
    Attr attr = (Attr) attrs.getNamedItemNS(namespaceURI, localName);
    setIdAttributeNode(attr, isId);
  }

  public boolean isEqualNode(Node arg)
  {
    if (!super.isEqualNode(arg))
      return false;
    getAttributes();
    NamedNodeMap argAttrs = arg.getAttributes();
    int len = argAttrs.getLength();
    if (argAttrs == null || (len != attributes.length))
      return false;
    for (int i = 0; i < len; i++)
      {
        Node argCtx = argAttrs.item(i);
        // Don't compare namespace nodes
        if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
            .equals(argCtx.getNamespaceURI()))
          continue;
        // Find corresponding attribute node
        DomNode ctx = attributes.first;
        for (; ctx != null; ctx = ctx.next)
          {
            if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
                .equals(ctx.getNamespaceURI()))
              continue;
            if (!ctx.isEqualNode(argCtx))
              continue;
            break;
          }
        if (ctx == null)
          return false; // not found
      }
    return true;
  }

}