1 /*
2 * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
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10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
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24 */
25
26 package javax.xml.parsers;
27
28 import com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl;
29 import javax.xml.validation.Schema;
30
31 /**
32 * Defines a factory API that enables applications to obtain a
33 * parser that produces DOM object trees from XML documents.
34 *
35 * @author Jeff Suttor
36 * @author Neeraj Bajaj
37 *
38 * @since 1.4
39 */
40
41 public abstract class DocumentBuilderFactory {
42 private static final String DEFAULT_IMPL =
43 "com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl";
44 private boolean validating = false;
45 private boolean namespaceAware = false;
46 private boolean whitespace = false;
47 private boolean expandEntityRef = true;
48 private boolean ignoreComments = false;
49 private boolean coalescing = false;
50
51 /**
52 * Protected constructor to prevent instantiation.
53 * Use {@link #newInstance()}.
54 */
55 protected DocumentBuilderFactory () {
56 }
57
58 /**
59 * Creates a new NamespaceAware instance of the {@code DocumentBuilderFactory}
60 * builtin system-default implementation. Parsers produced by the factory
61 * instance provides support for XML namespaces by default.
62 *
63 * @implSpec
64 * In addition to creating a factory instance using the same process as
65 * {@link #newDefaultInstance()}, this method must set NamespaceAware to true.
66 *
67 * @return a new instance of the {@code DocumentBuilderFactory} builtin
68 * system-default implementation.
69 *
70 * @since 13
71 */
72 public static DocumentBuilderFactory newDefaultNSInstance() {
73 return makeNSAware(new DocumentBuilderFactoryImpl());
74 }
75
76 /**
77 * Creates a new NamespaceAware instance of a {@code DocumentBuilderFactory}.
78 * Parsers produced by the factory instance provides support for XML namespaces
79 * by default.
80 *
81 * @implSpec
82 * In addition to creating a factory instance using the same process as
83 * {@link #newInstance()}, this method must set NamespaceAware to true.
84 *
85 * @return a new instance of a {@code DocumentBuilderFactory}
86 *
87 * @throws FactoryConfigurationError in case of {@linkplain
88 * java.util.ServiceConfigurationError service configuration error}
89 * or if the implementation is not available or cannot be instantiated.
90 *
91 * @since 13
92 */
93 public static DocumentBuilderFactory newNSInstance() {
94 return makeNSAware(FactoryFinder.find(DocumentBuilderFactory.class, DEFAULT_IMPL));
95 }
96
97 /**
98 * Creates a new NamespaceAware instance of a {@code DocumentBuilderFactory}
99 * from the class name. Parsers produced by the factory instance provides
100 * support for XML namespaces by default.
101 *
102 * @implSpec
103 * In addition to creating a factory instance using the same process as
104 * {@link #newInstance(java.lang.String, java.lang.ClassLoader)}, this method
105 * must set NamespaceAware to true.
106 *
107 * @param factoryClassName a fully qualified factory class name that provides
108 * implementation of
109 * {@code javax.xml.parsers.DocumentBuilderFactory}.
110 *
111 * @param classLoader the {@code ClassLoader} used to load the factory class.
112 * If it is {@code null}, the current {@code Thread}'s
113 * context classLoader is used to load the factory class.
114 *
115 * @return a new instance of a {@code DocumentBuilderFactory}
116 *
117 * @throws FactoryConfigurationError if {@code factoryClassName} is {@code null}, or
118 * the factory class cannot be loaded, instantiated.
119 *
120 * @since 13
121 */
122 public static DocumentBuilderFactory newNSInstance(String factoryClassName,
123 ClassLoader classLoader) {
124 return makeNSAware(FactoryFinder.newInstance(
125 DocumentBuilderFactory.class, factoryClassName, classLoader, false));
126 }
127
128 /**
129 * Creates a new instance of the {@code DocumentBuilderFactory} builtin
130 * system-default implementation.
131 *
132 * @return A new instance of the {@code DocumentBuilderFactory} builtin
133 * system-default implementation.
134 *
135 * @since 9
136 */
137 public static DocumentBuilderFactory newDefaultInstance() {
138 return new DocumentBuilderFactoryImpl();
139 }
140
141 /**
142 * Obtain a new instance of a
143 * {@code DocumentBuilderFactory}. This static method creates
144 * a new factory instance.
145 * This method uses the following ordered lookup procedure to determine
146 * the {@code DocumentBuilderFactory} implementation class to
147 * load:
148 * <ul>
149 * <li>
150 * Use the {@code javax.xml.parsers.DocumentBuilderFactory} system
151 * property.
152 * </li>
153 * <li>
154 * <p>
155 * Use the configuration file "jaxp.properties". The file is in standard
156 * {@link java.util.Properties} format and typically located in the
157 * {@code conf} directory of the Java installation. It contains the fully qualified
158 * name of the implementation class with the key being the system property
159 * defined above.
160 * <p>
161 * The jaxp.properties file is read only once by the JAXP implementation
162 * and its values are then cached for future use. If the file does not exist
163 * when the first attempt is made to read from it, no further attempts are
164 * made to check for its existence. It is not possible to change the value
165 * of any property in jaxp.properties after it has been read for the first time.
166 * </li>
167 * <li>
168 * <p>
169 * Use the service-provider loading facility, defined by the
170 * {@link java.util.ServiceLoader} class, to attempt to locate and load an
171 * implementation of the service using the {@linkplain
172 * java.util.ServiceLoader#load(java.lang.Class) default loading mechanism}:
173 * the service-provider loading facility will use the {@linkplain
174 * java.lang.Thread#getContextClassLoader() current thread's context class loader}
175 * to attempt to load the service. If the context class
176 * loader is null, the {@linkplain
177 * ClassLoader#getSystemClassLoader() system class loader} will be used.
178 * </li>
179 * <li>
180 * <p>
181 * Otherwise, the {@linkplain #newDefaultInstance() system-default}
182 * implementation is returned.
183 * </li>
184 * </ul>
185 *
186 * <p>
187 * Once an application has obtained a reference to a
188 * {@code DocumentBuilderFactory} it can use the factory to
189 * configure and obtain parser instances.
190 *
191 *
192 * <h4>Tip for Trouble-shooting</h4>
193 * <p>
194 * Setting the {@code jaxp.debug} system property will cause
195 * this method to print a lot of debug messages
196 * to {@code System.err} about what it is doing and where it is looking at.
197 *
198 * <p>
199 * If you have problems loading {@link DocumentBuilder}s, try:
200 * <pre>
201 * java -Djaxp.debug=1 YourProgram ....
202 * </pre>
203 *
204 * @return New instance of a {@code DocumentBuilderFactory}
205 *
206 * @throws FactoryConfigurationError in case of {@linkplain
207 * java.util.ServiceConfigurationError service configuration error} or if
208 * the implementation is not available or cannot be instantiated.
209 */
210 public static DocumentBuilderFactory newInstance() {
211 return FactoryFinder.find(
212 /* The default property name according to the JAXP spec */
213 DocumentBuilderFactory.class, // "javax.xml.parsers.DocumentBuilderFactory"
214 /* The fallback implementation class name */
215 DEFAULT_IMPL);
216 }
217
218 /**
219 * Obtain a new instance of a {@code DocumentBuilderFactory} from class name.
220 * This function is useful when there are multiple providers in the classpath.
221 * It gives more control to the application as it can specify which provider
222 * should be loaded.
223 *
224 * <p>Once an application has obtained a reference to a {@code DocumentBuilderFactory}
225 * it can use the factory to configure and obtain parser instances.
226 *
227 *
228 * <h4>Tip for Trouble-shooting</h4>
229 * <p>Setting the {@code jaxp.debug} system property will cause
230 * this method to print a lot of debug messages
231 * to {@code System.err} about what it is doing and where it is looking at.
232 *
233 * <p> If you have problems try:
234 * <pre>
235 * java -Djaxp.debug=1 YourProgram ....
236 * </pre>
237 *
238 * @param factoryClassName fully qualified factory class name that provides
239 * implementation of {@code javax.xml.parsers.DocumentBuilderFactory}.
240 *
241 * @param classLoader {@code ClassLoader} used to load the factory class. If {@code null}
242 * current {@code Thread}'s context classLoader is used to load the factory class.
243 *
244 * @return New instance of a {@code DocumentBuilderFactory}
245 *
246 * @throws FactoryConfigurationError if {@code factoryClassName} is {@code null}, or
247 * the factory class cannot be loaded, instantiated.
248 *
249 * @see #newInstance()
250 *
251 * @since 1.6
252 */
253 public static DocumentBuilderFactory newInstance(String factoryClassName, ClassLoader classLoader){
254 //do not fallback if given classloader can't find the class, throw exception
255 return FactoryFinder.newInstance(DocumentBuilderFactory.class,
256 factoryClassName, classLoader, false);
257 }
258
259 private static DocumentBuilderFactory makeNSAware(DocumentBuilderFactory dbf) {
260 dbf.setNamespaceAware(true);
261 return dbf;
262 }
263
264 /**
265 * Creates a new instance of a {@link javax.xml.parsers.DocumentBuilder}
266 * using the currently configured parameters.
267 *
268 * @return A new instance of a DocumentBuilder.
269 *
270 * @throws ParserConfigurationException if a DocumentBuilder
271 * cannot be created which satisfies the configuration requested.
272 */
273
274 public abstract DocumentBuilder newDocumentBuilder()
275 throws ParserConfigurationException;
276
277
278 /**
279 * Specifies that the parser produced by this code will
280 * provide support for XML namespaces. By default the value of this is set
281 * to {@code false}
282 *
283 * @param awareness true if the parser produced will provide support
284 * for XML namespaces; false otherwise.
285 */
286
287 public void setNamespaceAware(boolean awareness) {
288 this.namespaceAware = awareness;
289 }
290
291 /**
292 * Specifies that the parser produced by this code will
293 * validate documents as they are parsed. By default the value of this
294 * is set to {@code false}.
295 *
296 * <p>
297 * Note that "the validation" here means
298 * <a href="http://www.w3.org/TR/REC-xml#proc-types">a validating
299 * parser</a> as defined in the XML recommendation.
300 * In other words, it essentially just controls the DTD validation.
301 * (except the legacy two properties defined in JAXP 1.2.)
302 *
303 * <p>
304 * To use modern schema languages such as W3C XML Schema or
305 * RELAX NG instead of DTD, you can configure your parser to be
306 * a non-validating parser by leaving the {@link #setValidating(boolean)}
307 * method {@code false}, then use the {@link #setSchema(Schema)}
308 * method to associate a schema to a parser.
309 *
310 * @param validating true if the parser produced will validate documents
311 * as they are parsed; false otherwise.
312 */
313
314 public void setValidating(boolean validating) {
315 this.validating = validating;
316 }
317
318 /**
319 * Specifies that the parsers created by this factory must eliminate
320 * whitespace in element content (sometimes known loosely as
321 * 'ignorable whitespace') when parsing XML documents (see XML Rec
322 * 2.10). Note that only whitespace which is directly contained within
323 * element content that has an element only content model (see XML
324 * Rec 3.2.1) will be eliminated. Due to reliance on the content model
325 * this setting requires the parser to be in validating mode. By default
326 * the value of this is set to {@code false}.
327 *
328 * @param whitespace true if the parser created must eliminate whitespace
329 * in the element content when parsing XML documents;
330 * false otherwise.
331 */
332
333 public void setIgnoringElementContentWhitespace(boolean whitespace) {
334 this.whitespace = whitespace;
335 }
336
337 /**
338 * Specifies that the parser produced by this code will
339 * expand entity reference nodes. By default the value of this is set to
340 * {@code true}
341 *
342 * @param expandEntityRef true if the parser produced will expand entity
343 * reference nodes; false otherwise.
344 */
345
346 public void setExpandEntityReferences(boolean expandEntityRef) {
347 this.expandEntityRef = expandEntityRef;
348 }
349
350 /**
351 * Specifies that the parser produced by this code will
352 * ignore comments. By default the value of this is set to {@code false}.
353 *
354 * @param ignoreComments {@code boolean} value to ignore comments during processing
355 */
356
357 public void setIgnoringComments(boolean ignoreComments) {
358 this.ignoreComments = ignoreComments;
359 }
360
361 /**
362 * Specifies that the parser produced by this code will
363 * convert CDATA nodes to Text nodes and append it to the
364 * adjacent (if any) text node. By default the value of this is set to
365 * {@code false}
366 *
367 * @param coalescing true if the parser produced will convert CDATA nodes
368 * to Text nodes and append it to the adjacent (if any)
369 * text node; false otherwise.
370 */
371
372 public void setCoalescing(boolean coalescing) {
373 this.coalescing = coalescing;
374 }
375
376 /**
377 * Indicates whether or not the factory is configured to produce
378 * parsers which are namespace aware.
379 *
380 * @return true if the factory is configured to produce parsers which
381 * are namespace aware; false otherwise.
382 */
383
384 public boolean isNamespaceAware() {
385 return namespaceAware;
386 }
387
388 /**
389 * Indicates whether or not the factory is configured to produce
390 * parsers which validate the XML content during parse.
391 *
392 * @return true if the factory is configured to produce parsers
393 * which validate the XML content during parse; false otherwise.
394 */
395
396 public boolean isValidating() {
397 return validating;
398 }
399
400 /**
401 * Indicates whether or not the factory is configured to produce
402 * parsers which ignore ignorable whitespace in element content.
403 *
404 * @return true if the factory is configured to produce parsers
405 * which ignore ignorable whitespace in element content;
406 * false otherwise.
407 */
408
409 public boolean isIgnoringElementContentWhitespace() {
410 return whitespace;
411 }
412
413 /**
414 * Indicates whether or not the factory is configured to produce
415 * parsers which expand entity reference nodes.
416 *
417 * @return true if the factory is configured to produce parsers
418 * which expand entity reference nodes; false otherwise.
419 */
420
421 public boolean isExpandEntityReferences() {
422 return expandEntityRef;
423 }
424
425 /**
426 * Indicates whether or not the factory is configured to produce
427 * parsers which ignores comments.
428 *
429 * @return true if the factory is configured to produce parsers
430 * which ignores comments; false otherwise.
431 */
432
433 public boolean isIgnoringComments() {
434 return ignoreComments;
435 }
436
437 /**
438 * Indicates whether or not the factory is configured to produce
439 * parsers which converts CDATA nodes to Text nodes and appends it to
440 * the adjacent (if any) Text node.
441 *
442 * @return true if the factory is configured to produce parsers
443 * which converts CDATA nodes to Text nodes and appends it to
444 * the adjacent (if any) Text node; false otherwise.
445 */
446
447 public boolean isCoalescing() {
448 return coalescing;
449 }
450
451 /**
452 * Allows the user to set specific attributes on the underlying
453 * implementation.
454 * <p>
455 * All implementations that implement JAXP 1.5 or newer are required to
456 * support the {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_DTD} and
457 * {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_SCHEMA} properties.
458 *
459 * <ul>
460 * <li>
461 * Setting the {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_DTD} property
462 * restricts the access to external DTDs, external Entity References to the
463 * protocols specified by the property.
464 * If access is denied during parsing due to the restriction of this property,
465 * {@link org.xml.sax.SAXException} will be thrown by the parse methods defined by
466 * {@link javax.xml.parsers.DocumentBuilder}.
467 * </li>
468 * <li>
469 * Setting the {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_SCHEMA} property
470 * restricts the access to external Schema set by the schemaLocation attribute to
471 * the protocols specified by the property. If access is denied during parsing
472 * due to the restriction of this property, {@link org.xml.sax.SAXException}
473 * will be thrown by the parse methods defined by
474 * {@link javax.xml.parsers.DocumentBuilder}.
475 * </li>
476 * </ul>
477 *
478 * @param name The name of the attribute.
479 * @param value The value of the attribute.
480 *
481 * @throws IllegalArgumentException thrown if the underlying
482 * implementation doesn't recognize the attribute.
483 */
484 public abstract void setAttribute(String name, Object value)
485 throws IllegalArgumentException;
486
487 /**
488 * Allows the user to retrieve specific attributes on the underlying
489 * implementation.
490 *
491 * @param name The name of the attribute.
492 *
493 * @return value The value of the attribute.
494 *
495 * @throws IllegalArgumentException thrown if the underlying
496 * implementation doesn't recognize the attribute.
497 */
498 public abstract Object getAttribute(String name)
499 throws IllegalArgumentException;
500
501 /**
502 * Set a feature for this {@code DocumentBuilderFactory}
503 * and {@code DocumentBuilder}s created by this factory.
504 *
505 * <p>
506 * Feature names are fully qualified {@link java.net.URI}s.
507 * Implementations may define their own features.
508 * A {@link ParserConfigurationException} is thrown if this {@code DocumentBuilderFactory} or the
509 * {@code DocumentBuilder}s it creates cannot support the feature.
510 * It is possible for a {@code DocumentBuilderFactory} to expose a feature value but be unable to change its state.
511 *
512 *
513 * <p>
514 * All implementations are required to support the {@link javax.xml.XMLConstants#FEATURE_SECURE_PROCESSING} feature.
515 * When the feature is:
516 * <ul>
517 * <li>
518 * {@code true}: the implementation will limit XML processing to conform to implementation limits.
519 * Examples include entity expansion limits and XML Schema constructs that would consume large amounts of resources.
520 * If XML processing is limited for security reasons, it will be reported via a call to the registered
521 * {@link org.xml.sax.ErrorHandler#fatalError(SAXParseException exception)}.
522 * See {@link DocumentBuilder#setErrorHandler(org.xml.sax.ErrorHandler errorHandler)}.
523 * </li>
524 * <li>
525 * {@code false}: the implementation will processing XML according to the XML specifications without
526 * regard to possible implementation limits.
527 * </li>
528 * </ul>
529 *
530 * @param name Feature name.
531 * @param value Is feature state {@code true} or {@code false}.
532 *
533 * @throws ParserConfigurationException if this {@code DocumentBuilderFactory} or the {@code DocumentBuilder}s
534 * it creates cannot support this feature.
535 * @throws NullPointerException If the {@code name} parameter is null.
536 * @since 1.5
537 */
538 public abstract void setFeature(String name, boolean value)
539 throws ParserConfigurationException;
540
541 /**
542 * Get the state of the named feature.
543 *
544 * <p>
545 * Feature names are fully qualified {@link java.net.URI}s.
546 * Implementations may define their own features.
547 * An {@link ParserConfigurationException} is thrown if this {@code DocumentBuilderFactory} or the
548 * {@code DocumentBuilder}s it creates cannot support the feature.
549 * It is possible for an {@code DocumentBuilderFactory} to expose a feature value but be unable to change its state.
550 *
551 * @param name Feature name.
552 *
553 * @return State of the named feature.
554 *
555 * @throws ParserConfigurationException if this {@code DocumentBuilderFactory}
556 * or the {@code DocumentBuilder}s it creates cannot support this feature.
557 * @since 1.5
558 */
559 public abstract boolean getFeature(String name)
560 throws ParserConfigurationException;
561
562
563 /**
564 * Gets the {@link Schema} object specified through
565 * the {@link #setSchema(Schema schema)} method.
566 *
567 * @return
568 * the {@link Schema} object that was last set through
569 * the {@link #setSchema(Schema)} method, or null
570 * if the method was not invoked since a {@link DocumentBuilderFactory}
571 * is created.
572 *
573 * @throws UnsupportedOperationException When implementation does not
574 * override this method.
575 *
576 * @since 1.5
577 */
578 public Schema getSchema() {
579 throw new UnsupportedOperationException(
580 "This parser does not support specification \""
581 + this.getClass().getPackage().getSpecificationTitle()
582 + "\" version \""
583 + this.getClass().getPackage().getSpecificationVersion()
584 + "\""
585 );
586
587 }
588
589 /**
590 * Set the {@link Schema} to be used by parsers created
591 * from this factory.
592 *
593 * <p>
594 * When a {@link Schema} is non-null, a parser will use a validator
595 * created from it to validate documents before it passes information
596 * down to the application.
597 *
598 * <p>When errors are found by the validator, the parser is responsible
599 * to report them to the user-specified {@link org.xml.sax.ErrorHandler}
600 * (or if the error handler is not set, ignore them or throw them), just
601 * like any other errors found by the parser itself.
602 * In other words, if the user-specified {@link org.xml.sax.ErrorHandler}
603 * is set, it must receive those errors, and if not, they must be
604 * treated according to the implementation specific
605 * default error handling rules.
606 *
607 * <p>
608 * A validator may modify the outcome of a parse (for example by
609 * adding default values that were missing in documents), and a parser
610 * is responsible to make sure that the application will receive
611 * modified DOM trees.
612 *
613 * <p>
614 * Initially, null is set as the {@link Schema}.
615 *
616 * <p>
617 * This processing will take effect even if
618 * the {@link #isValidating()} method returns {@code false}.
619 *
620 * <p>It is an error to use
621 * the {@code http://java.sun.com/xml/jaxp/properties/schemaSource}
622 * property and/or the {@code http://java.sun.com/xml/jaxp/properties/schemaLanguage}
623 * property in conjunction with a {@link Schema} object.
624 * Such configuration will cause a {@link ParserConfigurationException}
625 * exception when the {@link #newDocumentBuilder()} is invoked.
626 *
627 *
628 * <h4>Note for implementors</h4>
629 *
630 * <p>
631 * A parser must be able to work with any {@link Schema}
632 * implementation. However, parsers and schemas are allowed
633 * to use implementation-specific custom mechanisms
634 * as long as they yield the result described in the specification.
635 *
636 *
637 * @param schema {@code Schema} to use or {@code null}
638 * to remove a schema.
639 *
640 * @throws UnsupportedOperationException When implementation does not
641 * override this method.
642 *
643 * @since 1.5
644 */
645 public void setSchema(Schema schema) {
646 throw new UnsupportedOperationException(
647 "This parser does not support specification \""
648 + this.getClass().getPackage().getSpecificationTitle()
649 + "\" version \""
650 + this.getClass().getPackage().getSpecificationVersion()
651 + "\""
652 );
653 }
654
655
656
657 /**
658 * Set state of XInclude processing.
659 *
660 * <p>If XInclude markup is found in the document instance, should it be
661 * processed as specified in <a href="http://www.w3.org/TR/xinclude/">
662 * XML Inclusions (XInclude) Version 1.0</a>.
663 *
664 * <p>XInclude processing defaults to {@code false}.
665 *
666 * @param state Set XInclude processing to {@code true} or
667 * {@code false}
668 *
669 * @throws UnsupportedOperationException When implementation does not
670 * override this method.
671 *
672 * @since 1.5
673 */
674 public void setXIncludeAware(final boolean state) {
675 if (state) {
676 throw new UnsupportedOperationException(" setXIncludeAware " +
677 "is not supported on this JAXP" +
678 " implementation or earlier: " + this.getClass());
679 }
680 }
681
682 /**
683 * Get state of XInclude processing.
684 *
685 * @return current state of XInclude processing
686 *
687 * @throws UnsupportedOperationException When implementation does not
688 * override this method.
689 *
690 * @since 1.5
691 */
692 public boolean isXIncludeAware() {
693 throw new UnsupportedOperationException(
694 "This parser does not support specification \""
695 + this.getClass().getPackage().getSpecificationTitle()
696 + "\" version \""
697 + this.getClass().getPackage().getSpecificationVersion()
698 + "\""
699 );
700 }
701 }