1 /*
2 * Copyright (c) 2003, 2015, 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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7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
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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).
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24 */
25
26 package javax.xml.bind;
27
28 import org.w3c.dom.Node;
29
30 import java.util.Collections;
31 import java.util.Map;
32 import java.util.Properties;
33 import java.io.IOException;
34 import java.io.InputStream;
35
36 /**
37 * The {@code JAXBContext} class provides the client's entry point to the
38 * JAXB API. It provides an abstraction for managing the XML/Java binding
39 * information necessary to implement the JAXB binding framework operations:
40 * unmarshal, marshal and validate.
41 *
42 * <p>A client application normally obtains new instances of this class using
43 * one of these two styles for newInstance methods, although there are other
44 * specialized forms of the method available:
45 *
46 * <ul>
47 * <li>{@link #newInstance(String, ClassLoader) JAXBContext.newInstance( "com.acme.foo:com.acme.bar" )} <br>
48 * The JAXBContext instance is initialized from a list of colon
49 * separated Java package names. Each java package contains
50 * JAXB mapped classes, schema-derived classes and/or user annotated
51 * classes. Additionally, the java package may contain JAXB package annotations
52 * that must be processed. (see JLS, Section 7.4.1 "Named Packages").
53 * </li>
54 * <li>{@link #newInstance(Class...) JAXBContext.newInstance( com.acme.foo.Foo.class )} <br>
55 * The JAXBContext instance is initialized with class(es)
56 * passed as parameter(s) and classes that are statically reachable from
57 * these class(es). See {@link #newInstance(Class...)} for details.
58 * </li>
59 * </ul>
60 *
61 * <p><i>
62 * The following JAXB 1.0 requirement is only required for schema to
63 * java interface/implementation binding. It does not apply to JAXB annotated
64 * classes. JAXB Providers must generate a {@code jaxb.properties} file in
65 * each package containing schema derived classes. The property file must
66 * contain a property named {@code javax.xml.bind.context.factory} whose
67 * value is the name of the class that implements the {@code createContext}
68 * APIs.</i>
69 *
70 * <p><i>
71 * The class supplied by the provider does not have to be assignable to
72 * {@code javax.xml.bind.JAXBContext}, it simply has to provide a class that
73 * implements the {@code createContext} APIs.</i>
74 *
75 * <p><i>
76 * In addition, the provider must call the
77 * {@link DatatypeConverter#setDatatypeConverter(DatatypeConverterInterface)
78 * DatatypeConverter.setDatatypeConverter} api prior to any client
79 * invocations of the marshal and unmarshal methods. This is necessary to
80 * configure the datatype converter that will be used during these operations.</i>
81 *
82 * <a name="Unmarshalling"></a>
83 * <h3>Unmarshalling</h3>
84 * <p>
85 * The {@link Unmarshaller} class provides the client application the ability
86 * to convert XML data into a tree of Java content objects.
87 * The unmarshal method allows for
88 * any global XML element declared in the schema to be unmarshalled as
89 * the root of an instance document.
90 * Additionally, the unmarshal method allows for an unrecognized root element that
91 * has an xsi:type attribute's value that references a type definition declared in
92 * the schema to be unmarshalled as the root of an instance document.
93 * The {@code JAXBContext} object
94 * allows the merging of global elements and type definitions across a set of schemas (listed
95 * in the {@code contextPath}). Since each schema in the schema set can belong
96 * to distinct namespaces, the unification of schemas to an unmarshalling
97 * context should be namespace independent. This means that a client
98 * application is able to unmarshal XML documents that are instances of
99 * any of the schemas listed in the {@code contextPath}. For example:
100 *
101 * <pre>
102 * JAXBContext jc = JAXBContext.newInstance( "com.acme.foo:com.acme.bar" );
103 * Unmarshaller u = jc.createUnmarshaller();
104 * FooObject fooObj = (FooObject)u.unmarshal( new File( "foo.xml" ) ); // ok
105 * BarObject barObj = (BarObject)u.unmarshal( new File( "bar.xml" ) ); // ok
106 * BazObject bazObj = (BazObject)u.unmarshal( new File( "baz.xml" ) ); // error, "com.acme.baz" not in contextPath
107 * </pre>
108 *
109 * <p>
110 * The client application may also generate Java content trees explicitly rather
111 * than unmarshalling existing XML data. For all JAXB-annotated value classes,
112 * an application can create content using constructors.
113 * For schema-derived interface/implementation classes and for the
114 * creation of elements that are not bound to a JAXB-annotated
115 * class, an application needs to have access and knowledge about each of
116 * the schema derived {@code ObjectFactory} classes that exist in each of
117 * java packages contained in the {@code contextPath}. For each schema
118 * derived java class, there is a static factory method that produces objects
119 * of that type. For example,
120 * assume that after compiling a schema, you have a package {@code com.acme.foo}
121 * that contains a schema derived interface named {@code PurchaseOrder}. In
122 * order to create objects of that type, the client application would use the
123 * factory method like this:
124 *
125 * <pre>
126 * com.acme.foo.PurchaseOrder po =
127 * com.acme.foo.ObjectFactory.createPurchaseOrder();
128 * </pre>
129 *
130 * <p>
131 * Once the client application has an instance of the the schema derived object,
132 * it can use the mutator methods to set content on it.
133 *
134 * <p>
135 * For more information on the generated {@code ObjectFactory} classes, see
136 * Section 4.2 <i>Java Package</i> of the specification.
137 *
138 * <p>
139 * <i>The provider must generate a class in each
140 * package that contains all of the necessary object factory methods for that
141 * package named ObjectFactory as well as the static
142 * {@code newInstance( javaContentInterface )} method</i>
143 *
144 * <h3>Marshalling</h3>
145 * <p>
146 * The {@link Marshaller} class provides the client application the ability
147 * to convert a Java content tree back into XML data. There is no difference
148 * between marshalling a content tree that is created manually using the factory
149 * methods and marshalling a content tree that is the result an {@code unmarshal}
150 * operation. Clients can marshal a java content tree back to XML data
151 * to a {@code java.io.OutputStream} or a {@code java.io.Writer}. The
152 * marshalling process can alternatively produce SAX2 event streams to a
153 * registered {@code ContentHandler} or produce a DOM Node object.
154 * Client applications have control over the output encoding as well as
155 * whether or not to marshal the XML data as a complete document or
156 * as a fragment.
157 *
158 * <p>
159 * Here is a simple example that unmarshals an XML document and then marshals
160 * it back out:
161 *
162 * <pre>
163 * JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
164 *
165 * // unmarshal from foo.xml
166 * Unmarshaller u = jc.createUnmarshaller();
167 * FooObject fooObj = (FooObject)u.unmarshal( new File( "foo.xml" ) );
168 *
169 * // marshal to System.out
170 * Marshaller m = jc.createMarshaller();
171 * m.marshal( fooObj, System.out );
172 * </pre>
173 *
174 *
175 * <h3>Validation</h3>
176 * <p>
177 * Validation has been changed significantly since JAXB 1.0. The {@link Validator}
178 * class has been deprecated and made optional. This means that you are advised
179 * not to use this class and, in fact, it may not even be available depending on
180 * your JAXB provider. JAXB 1.0 client applications that rely on {@code Validator}
181 * will still work properly when deployed with the JAXB 1.0 runtime system.
182 *
183 * In JAXB 2.0, the {@link Unmarshaller} has included convenince methods that expose
184 * the JAXP 1.3 {@link javax.xml.validation} framework. Please refer to the
185 * {@link Unmarshaller#setSchema(javax.xml.validation.Schema)} API for more
186 * information.
187 *
188 *
189 * <h3>JAXB Runtime Binding Framework Compatibility</h3>
190 * <p>
191 * The following JAXB 1.0 restriction only applies to binding schema to
192 * interfaces/implementation classes.
193 * Since this binding does not require a common runtime system, a JAXB
194 * client application must not attempt to mix runtime objects ({@code JAXBContext,
195 * Marshaller}, etc. ) from different providers. This does not
196 * mean that the client application isn't portable, it simply means that a
197 * client has to use a runtime system provided by the same provider that was
198 * used to compile the schema.
199 *
200 *
201 * <h3>Discovery of JAXB implementation</h3>
202 * <p>
203 * When one of the {@code newInstance} methods is called, a JAXB implementation is discovered
204 * by the following steps.
205 *
206 * <ol>
207 *
208 * <li>
209 * For each package/class explicitly passed in to the {@link #newInstance} method, in the order they are specified,
210 * {@code jaxb.properties} file is looked up in its package, by using the associated classloader —
211 * this is {@link Class#getClassLoader() the owner class loader} for a {@link Class} argument, and for a package
212 * the specified {@link ClassLoader}.
213 *
214 * <p>
215 * If such a file is discovered, it is {@link Properties#load(InputStream) loaded} as a property file, and
216 * the value of the {@link #JAXB_CONTEXT_FACTORY} key will be assumed to be the provider factory class.
217 * This class is then loaded by the associated class loader discussed above.
218 *
219 * <p>
220 * This phase of the look up allows some packages to force the use of a certain JAXB implementation.
221 * (For example, perhaps the schema compiler has generated some vendor extension in the code.)
222 *
223 * <li>
224 * If the system property {@link #JAXB_CONTEXT_FACTORY} exists, then its value is assumed to be the provider
225 * factory class. This phase of the look up enables per-JVM override of the JAXB implementation.
226 *
227 * <li>
228 * Provider of {@link javax.xml.bind.JAXBContextFactory} is loaded using the service-provider loading
229 * facilities, defined by the {@link java.util.ServiceLoader} class, to attempt
230 * to locate and load an implementation of the service using the {@linkplain
231 * java.util.ServiceLoader#load(java.lang.Class) default loading mechanism}: the service-provider loading facility
232 * will use the {@linkplain java.lang.Thread#getContextClassLoader() current thread's context class loader}
233 * to attempt to load the context factory. If the context class loader is null, the
234 * {@linkplain ClassLoader#getSystemClassLoader() system class loader} will be used.
235 * <br>
236 * In case of {@link java.util.ServiceConfigurationError service
237 * configuration error} a {@link javax.xml.bind.JAXBException} will be thrown.
238 * </li>
239 *
240 * <li>
241 * Look for resource {@code /META-INF/services/javax.xml.bind.JAXBContext} using provided class loader.
242 * Methods without class loader parameter use {@code Thread.currentThread().getContextClassLoader()}.
243 * If such a resource exists, its content is assumed to be the provider factory class and must supply
244 * an implementation class containing the following method signatures:
245 *
246 * <pre>
247 *
248 * public static JAXBContext createContext(
249 * String contextPath,
250 * ClassLoader classLoader,
251 * Map<String,Object> properties throws JAXBException
252 *
253 * public static JAXBContext createContext(
254 * Class[] classes,
255 * Map<String,Object> properties ) throws JAXBException
256 * </pre>
257 * This configuration method is deprecated.
258 *
259 * <li>
260 * Finally, if all the steps above fail, then the rest of the look up is unspecified. That said,
261 * the recommended behavior is to simply look for some hard-coded platform default JAXB implementation.
262 * This phase of the look up is so that JavaSE can have its own JAXB implementation as the last resort.
263 * </ol>
264 *
265 * <p>
266 * Once the provider factory class {@link javax.xml.bind.JAXBContextFactory} is discovered, one of its methods
267 * {@link javax.xml.bind.JAXBContextFactory#createContext(String, ClassLoader, java.util.Map)} or
268 * {@link javax.xml.bind.JAXBContextFactory#createContext(Class[], java.util.Map)} is invoked
269 * to create a {@link JAXBContext}.
270 *
271 * @apiNote
272 * <p>Service discovery method using file /META-INF/services/javax.xml.bind.JAXBContext (described in step 4)
273 * and leveraging provider's static methods is supported only to allow backwards compatibility, but it is strongly
274 * recommended to migrate to standard ServiceLoader mechanism (described in step 3).
275 *
276 * @implNote
277 * Within the last step, if Glassfish AS environment detected, its specific service loader is used to find factory class.
278 *
279 * @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li>
280 * <li>Kohsuke Kawaguchi, Sun Microsystems, Inc.</li>
281 * <li>Joe Fialli, Sun Microsystems, Inc.</li></ul>
282 *
283 * @see Marshaller
284 * @see Unmarshaller
285 * @see <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-7.html#jls-7.4.1">S 7.4.1 "Named Packages"
286 * in Java Language Specification</a>
287 *
288 * @since 1.6, JAXB 1.0
289 */
290 public abstract class JAXBContext {
291
292 /**
293 * The name of the property that contains the name of the class capable
294 * of creating new {@code JAXBContext} objects.
295 */
296 public static final String JAXB_CONTEXT_FACTORY = "javax.xml.bind.JAXBContextFactory";
297
298 protected JAXBContext() {
299 }
300
301
302 /**
303 * Create a new instance of a {@code JAXBContext} class.
304 *
305 * <p>
306 * This is a convenience method to invoke the
307 * {@link #newInstance(String,ClassLoader)} method with
308 * the context class loader of the current thread.
309 *
310 * @throws JAXBException if an error was encountered while creating the
311 * {@code JAXBContext} such as
312 * <ol>
313 * <li>failure to locate either ObjectFactory.class or jaxb.index in the packages</li>
314 * <li>an ambiguity among global elements contained in the contextPath</li>
315 * <li>failure to locate a value for the context factory provider property</li>
316 * <li>mixing schema derived packages from different providers on the same contextPath</li>
317 * </ol>
318 */
319 public static JAXBContext newInstance( String contextPath )
320 throws JAXBException {
321
322 //return newInstance( contextPath, JAXBContext.class.getClassLoader() );
323 return newInstance( contextPath, getContextClassLoader());
324 }
325
326 /**
327 * Create a new instance of a {@code JAXBContext} class.
328 *
329 * <p>
330 * The client application must supply a context path which is a list of
331 * colon (':', \u005Cu003A) separated java package names that contain
332 * schema-derived classes and/or fully qualified JAXB-annotated classes.
333 * Schema-derived
334 * code is registered with the JAXBContext by the
335 * ObjectFactory.class generated per package.
336 * Alternatively than being listed in the context path, programmer
337 * annotated JAXB mapped classes can be listed in a
338 * {@code jaxb.index} resource file, format described below.
339 * Note that a java package can contain both schema-derived classes and
340 * user annotated JAXB classes. Additionally, the java package may
341 * contain JAXB package annotations that must be processed. (see JLS,
342 * Section 7.4.1 "Named Packages").
343 * </p>
344 *
345 * <p>
346 * Every package listed on the contextPath must meet <b>one or both</b> of the
347 * following conditions otherwise a {@code JAXBException} will be thrown:
348 * </p>
349 * <ol>
350 * <li>it must contain ObjectFactory.class</li>
351 * <li>it must contain jaxb.index</li>
352 * </ol>
353 *
354 * <p>
355 * <b>Format for jaxb.index</b>
356 * <p>
357 * The file contains a newline-separated list of class names.
358 * Space and tab characters, as well as blank
359 * lines, are ignored. The comment character
360 * is '#' (0x23); on each line all characters following the first comment
361 * character are ignored. The file must be encoded in UTF-8. Classes that
362 * are reachable, as defined in {@link #newInstance(Class...)}, from the
363 * listed classes are also registered with JAXBContext.
364 * <p>
365 * Constraints on class name occuring in a {@code jaxb.index} file are:
366 * <ul>
367 * <li>Must not end with ".class".</li>
368 * <li>Class names are resolved relative to package containing
369 * {@code jaxb.index} file. Only classes occuring directly in package
370 * containing {@code jaxb.index} file are allowed.</li>
371 * <li>Fully qualified class names are not allowed.
372 * A qualified class name,relative to current package,
373 * is only allowed to specify a nested or inner class.</li>
374 * </ul>
375 *
376 * <p>
377 * To maintain compatibility with JAXB 1.0 schema to java
378 * interface/implementation binding, enabled by schema customization
379 * {@code <jaxb:globalBindings valueClass="false">},
380 * the JAXB provider will ensure that each package on the context path
381 * has a {@code jaxb.properties} file which contains a value for the
382 * {@code javax.xml.bind.context.factory} property and that all values
383 * resolve to the same provider. This requirement does not apply to
384 * JAXB annotated classes.
385 *
386 * <p>
387 * If there are any global XML element name collisions across the various
388 * packages listed on the {@code contextPath}, a {@code JAXBException}
389 * will be thrown.
390 *
391 * <p>
392 * Mixing generated interface/impl bindings from multiple JAXB Providers
393 * in the same context path may result in a {@code JAXBException}
394 * being thrown.
395 *
396 * <p>
397 * The steps involved in discovering the JAXB implementation is discussed in the class javadoc.
398 *
399 * @param contextPath list of java package names that contain schema
400 * derived class and/or java to schema (JAXB-annotated)
401 * mapped classes
402 * @param classLoader
403 * This class loader will be used to locate the implementation
404 * classes.
405 *
406 * @return a new instance of a {@code JAXBContext}
407 * @throws JAXBException if an error was encountered while creating the
408 * {@code JAXBContext} such as
409 * <ol>
410 * <li>failure to locate either ObjectFactory.class or jaxb.index in the packages</li>
411 * <li>an ambiguity among global elements contained in the contextPath</li>
412 * <li>failure to locate a value for the context factory provider property</li>
413 * <li>mixing schema derived packages from different providers on the same contextPath</li>
414 * </ol>
415 */
416 public static JAXBContext newInstance( String contextPath, ClassLoader classLoader ) throws JAXBException {
417
418 return newInstance(contextPath,classLoader,Collections.<String,Object>emptyMap());
419 }
420
421 /**
422 * Create a new instance of a {@code JAXBContext} class.
423 *
424 * <p>
425 * This is mostly the same as {@link JAXBContext#newInstance(String, ClassLoader)},
426 * but this version allows you to pass in provider-specific properties to configure
427 * the instantiation of {@link JAXBContext}.
428 *
429 * <p>
430 * The interpretation of properties is up to implementations. Implementations should
431 * throw {@code JAXBException} if it finds properties that it doesn't understand.
432 *
433 * @param contextPath list of java package names that contain schema derived classes
434 * @param classLoader
435 * This class loader will be used to locate the implementation classes.
436 * @param properties
437 * provider-specific properties. Can be null, which means the same thing as passing
438 * in an empty map.
439 *
440 * @return a new instance of a {@code JAXBContext}
441 * @throws JAXBException if an error was encountered while creating the
442 * {@code JAXBContext} such as
443 * <ol>
444 * <li>failure to locate either ObjectFactory.class or jaxb.index in the packages</li>
445 * <li>an ambiguity among global elements contained in the contextPath</li>
446 * <li>failure to locate a value for the context factory provider property</li>
447 * <li>mixing schema derived packages from different providers on the same contextPath</li>
448 * </ol>
449 * @since 1.6, JAXB 2.0
450 */
451 public static JAXBContext newInstance( String contextPath,
452 ClassLoader classLoader,
453 Map<String,?> properties ) throws JAXBException {
454
455 return ContextFinder.find(
456 /* The default property name according to the JAXB spec */
457 JAXB_CONTEXT_FACTORY,
458
459 /* the context path supplied by the client app */
460 contextPath,
461
462 /* class loader to be used */
463 classLoader,
464 properties );
465 }
466
467 // TODO: resurrect this once we introduce external annotations
468 // /**
469 // * Create a new instance of a {@code JAXBContext} class.
470 // *
471 // * <p>
472 // * The client application must supply a list of classes that the new
473 // * context object needs to recognize.
474 // *
475 // * Not only the new context will recognize all the classes specified,
476 // * but it will also recognize any classes that are directly/indirectly
477 // * referenced statically from the specified classes.
478 // *
479 // * For example, in the following Java code, if you do
480 // * {@code newInstance(Foo.class)}, the newly created {@link JAXBContext}
481 // * will recognize both {@code Foo} and {@code Bar}, but not {@code Zot}:
482 // * <pre>
483 // * class Foo {
484 // * Bar b;
485 // * }
486 // * class Bar { int x; }
487 // * class Zot extends Bar { int y; }
488 // * </pre>
489 // *
490 // * Therefore, a typical client application only needs to specify the
491 // * top-level classes, but it needs to be careful.
492 // *
493 // * TODO: if we are to define other mechanisms, refer to them.
494 // *
495 // * @param externalBindings
496 // * list of external binding files. Can be null or empty if none is used.
497 // * when specified, those files determine how the classes are bound.
498 // *
499 // * @param classesToBeBound
500 // * list of java classes to be recognized by the new {@link JAXBContext}.
501 // * Can be empty, in which case a {@link JAXBContext} that only knows about
502 // * spec-defined classes will be returned.
503 // *
504 // * @return
505 // * A new instance of a {@code JAXBContext}.
506 // *
507 // * @throws JAXBException
508 // * if an error was encountered while creating the
509 // * {@code JAXBContext}, such as (but not limited to):
510 // * <ol>
511 // * <li>No JAXB implementation was discovered
512 // * <li>Classes use JAXB annotations incorrectly
513 // * <li>Classes have colliding annotations (i.e., two classes with the same type name)
514 // * <li>Specified external bindings are incorrect
515 // * <li>The JAXB implementation was unable to locate
516 // * provider-specific out-of-band information (such as additional
517 // * files generated at the development time.)
518 // * </ol>
519 // *
520 // * @throws IllegalArgumentException
521 // * if the parameter contains {@code null} (i.e., {@code newInstance(null);})
522 // *
523 // * @since JAXB 2.0
524 // */
525 // public static JAXBContext newInstance( Source[] externalBindings, Class... classesToBeBound )
526 // throws JAXBException {
527 //
528 // // empty class list is not an error, because the context will still include
529 // // spec-specified classes like String and Integer.
530 // // if(classesToBeBound.length==0)
531 // // throw new IllegalArgumentException();
532 //
533 // // but it is an error to have nulls in it.
534 // for( int i=classesToBeBound.length-1; i>=0; i-- )
535 // if(classesToBeBound[i]==null)
536 // throw new IllegalArgumentException();
537 //
538 // return ContextFinder.find(externalBindings,classesToBeBound);
539 // }
540
541 /**
542 * Create a new instance of a {@code JAXBContext} class.
543 *
544 * <p>
545 * The client application must supply a list of classes that the new
546 * context object needs to recognize.
547 *
548 * Not only the new context will recognize all the classes specified,
549 * but it will also recognize any classes that are directly/indirectly
550 * referenced statically from the specified classes. Subclasses of
551 * referenced classes nor {@code @XmlTransient} referenced classes
552 * are not registered with JAXBContext.
553 *
554 * For example, in the following Java code, if you do
555 * {@code newInstance(Foo.class)}, the newly created {@link JAXBContext}
556 * will recognize both {@code Foo} and {@code Bar}, but not {@code Zot} or {@code FooBar}:
557 * <pre>
558 * class Foo {
559 * @XmlTransient FooBar c;
560 * Bar b;
561 * }
562 * class Bar { int x; }
563 * class Zot extends Bar { int y; }
564 * class FooBar { }
565 * </pre>
566 *
567 * Therefore, a typical client application only needs to specify the
568 * top-level classes, but it needs to be careful.
569 *
570 * <p>
571 * Note that for each java package registered with JAXBContext,
572 * when the optional package annotations exist, they must be processed.
573 * (see JLS, Section 7.4.1 "Named Packages").
574 *
575 * <p>
576 * The steps involved in discovering the JAXB implementation is discussed in the class javadoc.
577 *
578 * @param classesToBeBound
579 * list of java classes to be recognized by the new {@link JAXBContext}.
580 * Can be empty, in which case a {@link JAXBContext} that only knows about
581 * spec-defined classes will be returned.
582 *
583 * @return
584 * A new instance of a {@code JAXBContext}.
585 *
586 * @throws JAXBException
587 * if an error was encountered while creating the
588 * {@code JAXBContext}, such as (but not limited to):
589 * <ol>
590 * <li>No JAXB implementation was discovered
591 * <li>Classes use JAXB annotations incorrectly
592 * <li>Classes have colliding annotations (i.e., two classes with the same type name)
593 * <li>The JAXB implementation was unable to locate
594 * provider-specific out-of-band information (such as additional
595 * files generated at the development time.)
596 * </ol>
597 *
598 * @throws IllegalArgumentException
599 * if the parameter contains {@code null} (i.e., {@code newInstance(null);})
600 *
601 * @since 1.6, JAXB 2.0
602 */
603 public static JAXBContext newInstance( Class<?> ... classesToBeBound )
604 throws JAXBException {
605
606 return newInstance(classesToBeBound,Collections.<String,Object>emptyMap());
607 }
608
609 /**
610 * Create a new instance of a {@code JAXBContext} class.
611 *
612 * <p>
613 * An overloading of {@link JAXBContext#newInstance(Class...)}
614 * to configure 'properties' for this instantiation of {@link JAXBContext}.
615 *
616 * <p>
617 * The interpretation of properties is up to implementations. Implementations should
618 * throw {@code JAXBException} if it finds properties that it doesn't understand.
619 *
620 * @param classesToBeBound
621 * list of java classes to be recognized by the new {@link JAXBContext}.
622 * Can be empty, in which case a {@link JAXBContext} that only knows about
623 * spec-defined classes will be returned.
624 * @param properties
625 * provider-specific properties. Can be null, which means the same thing as passing
626 * in an empty map.
627 *
628 * @return
629 * A new instance of a {@code JAXBContext}.
630 *
631 * @throws JAXBException
632 * if an error was encountered while creating the
633 * {@code JAXBContext}, such as (but not limited to):
634 * <ol>
635 * <li>No JAXB implementation was discovered
636 * <li>Classes use JAXB annotations incorrectly
637 * <li>Classes have colliding annotations (i.e., two classes with the same type name)
638 * <li>The JAXB implementation was unable to locate
639 * provider-specific out-of-band information (such as additional
640 * files generated at the development time.)
641 * </ol>
642 *
643 * @throws IllegalArgumentException
644 * if the parameter contains {@code null} (i.e., {@code newInstance(null,someMap);})
645 *
646 * @since 1.6, JAXB 2.0
647 */
648 public static JAXBContext newInstance( Class<?>[] classesToBeBound, Map<String,?> properties )
649 throws JAXBException {
650
651 if (classesToBeBound == null) {
652 throw new IllegalArgumentException();
653 }
654
655 // but it is an error to have nulls in it.
656 for (int i = classesToBeBound.length - 1; i >= 0; i--) {
657 if (classesToBeBound[i] == null) {
658 throw new IllegalArgumentException();
659 }
660 }
661
662 return ContextFinder.find(classesToBeBound,properties);
663 }
664
665 /**
666 * Create an {@code Unmarshaller} object that can be used to convert XML
667 * data into a java content tree.
668 *
669 * @return an {@code Unmarshaller} object
670 *
671 * @throws JAXBException if an error was encountered while creating the
672 * {@code Unmarshaller} object
673 */
674 public abstract Unmarshaller createUnmarshaller() throws JAXBException;
675
676
677 /**
678 * Create a {@code Marshaller} object that can be used to convert a
679 * java content tree into XML data.
680 *
681 * @return a {@code Marshaller} object
682 *
683 * @throws JAXBException if an error was encountered while creating the
684 * {@code Marshaller} object
685 */
686 public abstract Marshaller createMarshaller() throws JAXBException;
687
688
689 /**
690 * {@link Validator} has been made optional and deprecated in JAXB 2.0. Please
691 * refer to the javadoc for {@link Validator} for more detail.
692 * <p>
693 * Create a {@code Validator} object that can be used to validate a
694 * java content tree against its source schema.
695 *
696 * @return a {@code Validator} object
697 *
698 * @throws JAXBException if an error was encountered while creating the
699 * {@code Validator} object
700 * @deprecated since JAXB2.0
701 */
702 public abstract Validator createValidator() throws JAXBException;
703
704 /**
705 * Creates a {@code Binder} object that can be used for
706 * associative/in-place unmarshalling/marshalling.
707 *
708 * @param domType select the DOM API to use by passing in its DOM Node class.
709 *
710 * @return always a new valid {@code Binder} object.
711 *
712 * @throws UnsupportedOperationException
713 * if DOM API corresponding to {@code domType} is not supported by
714 * the implementation.
715 *
716 * @since 1.6, JAXB 2.0
717 */
718 public <T> Binder<T> createBinder(Class<T> domType) {
719 // to make JAXB 1.0 implementations work, this method must not be
720 // abstract
721 throw new UnsupportedOperationException();
722 }
723
724 /**
725 * Creates a {@code Binder} for W3C DOM.
726 *
727 * @return always a new valid {@code Binder} object.
728 *
729 * @since 1.6, JAXB 2.0
730 */
731 public Binder<Node> createBinder() {
732 return createBinder(Node.class);
733 }
734
735 /**
736 * Creates a {@code JAXBIntrospector} object that can be used to
737 * introspect JAXB objects.
738 *
739 * @return
740 * always return a non-null valid {@code JAXBIntrospector} object.
741 *
742 * @throws UnsupportedOperationException
743 * Calling this method on JAXB 1.0 implementations will throw
744 * an UnsupportedOperationException.
745 *
746 * @since 1.6, JAXB 2.0
747 */
748 public JAXBIntrospector createJAXBIntrospector() {
749 // to make JAXB 1.0 implementations work, this method must not be
750 // abstract
751 throw new UnsupportedOperationException();
752 }
753
754 /**
755 * Generates the schema documents for this context.
756 *
757 * @param outputResolver
758 * this object controls the output to which schemas
759 * will be sent.
760 *
761 * @throws IOException
762 * if {@link SchemaOutputResolver} throws an {@link IOException}.
763 *
764 * @throws UnsupportedOperationException
765 * Calling this method on JAXB 1.0 implementations will throw
766 * an UnsupportedOperationException.
767 *
768 * @since 1.6, JAXB 2.0
769 */
770 public void generateSchema(SchemaOutputResolver outputResolver) throws IOException {
771 // to make JAXB 1.0 implementations work, this method must not be
772 // abstract
773 throw new UnsupportedOperationException();
774 }
775
776 private static ClassLoader getContextClassLoader() {
777 if (System.getSecurityManager() == null) {
778 return Thread.currentThread().getContextClassLoader();
779 } else {
780 return java.security.AccessController.doPrivileged(
781 new java.security.PrivilegedAction<ClassLoader>() {
782 public ClassLoader run() {
783 return Thread.currentThread().getContextClassLoader();
784 }
785 });
786 }
787 }
788
789 }