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 *
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10 *
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 * <p>
38 * The <tt>JAXBContext</tt> class provides the client's entry point to the
39 * JAXB API. It provides an abstraction for managing the XML/Java binding
40 * information necessary to implement the JAXB binding framework operations:
41 * unmarshal, marshal and validate.
42 *
43 * <p>A client application normally obtains new instances of this class using
44 * one of these two styles for newInstance methods, although there are other
45 * specialized forms of the method available:
46 *
47 * <ul>
48 * <li>{@link #newInstance(String, ClassLoader) JAXBContext.newInstance( "com.acme.foo:com.acme.bar" )} <br>
49 * The JAXBContext instance is initialized from a list of colon
50 * separated Java package names. Each java package contains
51 * JAXB mapped classes, schema-derived classes and/or user annotated
52 * classes. Additionally, the java package may contain JAXB package annotations
53 * that must be processed. (see JLS, Section 7.4.1 "Named Packages").
54 * </li>
55 * <li>{@link #newInstance(Class...) JAXBContext.newInstance( com.acme.foo.Foo.class )} <br>
56 * The JAXBContext instance is initialized with class(es)
57 * passed as parameter(s) and classes that are statically reachable from
58 * these class(es). See {@link #newInstance(Class...)} for details.
59 * </li>
60 * </ul>
61 *
62 * <p><i>
63 * The following JAXB 1.0 requirement is only required for schema to
64 * java interface/implementation binding. It does not apply to JAXB annotated
65 * classes. JAXB Providers must generate a <tt>jaxb.properties</tt> file in
66 * each package containing schema derived classes. The property file must
67 * contain a property named <tt>javax.xml.bind.context.factory</tt> whose
68 * value is the name of the class that implements the <tt>createContext</tt>
69 * APIs.</i>
70 *
71 * <p><i>
72 * The class supplied by the provider does not have to be assignable to
73 * <tt>javax.xml.bind.JAXBContext</tt>, it simply has to provide a class that
74 * implements the <tt>createContext</tt> APIs.</i>
75 *
76 * <p><i>
77 * In addition, the provider must call the
78 * {@link DatatypeConverter#setDatatypeConverter(DatatypeConverterInterface)
79 * DatatypeConverter.setDatatypeConverter} api prior to any client
80 * invocations of the marshal and unmarshal methods. This is necessary to
81 * configure the datatype converter that will be used during these operations.</i>
82 *
83 * <a name="Unmarshalling"></a>
84 * <h3>Unmarshalling</h3>
85 * <p>
86 * The {@link Unmarshaller} class provides the client application the ability
87 * to convert XML data into a tree of Java content objects.
88 * The unmarshal method allows for
89 * any global XML element declared in the schema to be unmarshalled as
90 * the root of an instance document.
91 * Additionally, the unmarshal method allows for an unrecognized root element that
92 * has an xsi:type attribute's value that references a type definition declared in
93 * the schema to be unmarshalled as the root of an instance document.
94 * The <tt>JAXBContext</tt> object
95 * allows the merging of global elements and type definitions across a set of schemas (listed
96 * in the <tt>contextPath</tt>). Since each schema in the schema set can belong
97 * to distinct namespaces, the unification of schemas to an unmarshalling
98 * context should be namespace independent. This means that a client
99 * application is able to unmarshal XML documents that are instances of
100 * any of the schemas listed in the <tt>contextPath</tt>. For example:
101 *
102 * <pre>
103 * JAXBContext jc = JAXBContext.newInstance( "com.acme.foo:com.acme.bar" );
104 * Unmarshaller u = jc.createUnmarshaller();
105 * FooObject fooObj = (FooObject)u.unmarshal( new File( "foo.xml" ) ); // ok
106 * BarObject barObj = (BarObject)u.unmarshal( new File( "bar.xml" ) ); // ok
107 * BazObject bazObj = (BazObject)u.unmarshal( new File( "baz.xml" ) ); // error, "com.acme.baz" not in contextPath
108 * </pre>
109 *
110 * <p>
111 * The client application may also generate Java content trees explicitly rather
112 * than unmarshalling existing XML data. For all JAXB-annotated value classes,
113 * an application can create content using constructors.
114 * For schema-derived interface/implementation classes and for the
115 * creation of elements that are not bound to a JAXB-annotated
116 * class, an application needs to have access and knowledge about each of
117 * the schema derived <tt> ObjectFactory</tt> classes that exist in each of
118 * java packages contained in the <tt>contextPath</tt>. For each schema
119 * derived java class, there is a static factory method that produces objects
120 * of that type. For example,
121 * assume that after compiling a schema, you have a package <tt>com.acme.foo</tt>
122 * that contains a schema derived interface named <tt>PurchaseOrder</tt>. In
123 * order to create objects of that type, the client application would use the
124 * factory method like this:
125 *
126 * <pre>
127 * com.acme.foo.PurchaseOrder po =
128 * com.acme.foo.ObjectFactory.createPurchaseOrder();
129 * </pre>
130 *
131 * <p>
132 * Once the client application has an instance of the the schema derived object,
133 * it can use the mutator methods to set content on it.
134 *
135 * <p>
136 * For more information on the generated <tt>ObjectFactory</tt> classes, see
137 * Section 4.2 <i>Java Package</i> of the specification.
138 *
139 * <p>
140 * <i>The provider must generate a class in each
141 * package that contains all of the necessary object factory methods for that
142 * package named ObjectFactory as well as the static
143 * <tt>newInstance( javaContentInterface )</tt> method</i>
144 *
145 * <h3>Marshalling</h3>
146 * <p>
147 * The {@link Marshaller} class provides the client application the ability
148 * to convert a Java content tree back into XML data. There is no difference
149 * between marshalling a content tree that is created manually using the factory
150 * methods and marshalling a content tree that is the result an <tt>unmarshal
151 * </tt> operation. Clients can marshal a java content tree back to XML data
152 * to a <tt>java.io.OutputStream</tt> or a <tt>java.io.Writer</tt>. The
153 * marshalling process can alternatively produce SAX2 event streams to a
154 * registered <tt>ContentHandler</tt> or produce a DOM Node object.
155 * Client applications have control over the output encoding as well as
156 * whether or not to marshal the XML data as a complete document or
157 * as a fragment.
158 *
159 * <p>
160 * Here is a simple example that unmarshals an XML document and then marshals
161 * it back out:
162 *
163 * <pre>
164 * JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
165 *
166 * // unmarshal from foo.xml
167 * Unmarshaller u = jc.createUnmarshaller();
168 * FooObject fooObj = (FooObject)u.unmarshal( new File( "foo.xml" ) );
169 *
170 * // marshal to System.out
171 * Marshaller m = jc.createMarshaller();
172 * m.marshal( fooObj, System.out );
173 * </pre>
174 *
175 *
176 * <h3>Validation</h3>
177 * <p>
178 * Validation has been changed significantly since JAXB 1.0. The {@link Validator}
179 * class has been deprecated and made optional. This means that you are advised
180 * not to use this class and, in fact, it may not even be available depending on
181 * your JAXB provider. JAXB 1.0 client applications that rely on <tt>Validator</tt>
182 * will still work properly when deployed with the JAXB 1.0 runtime system.
183 *
184 * In JAXB 2.0, the {@link Unmarshaller} has included convenince methods that expose
185 * the JAXP 1.3 {@link javax.xml.validation} framework. Please refer to the
186 * {@link Unmarshaller#setSchema(javax.xml.validation.Schema)} API for more
187 * information.
188 *
189 *
190 * <h3>JAXB Runtime Binding Framework Compatibility</h3>
191 * <p>
192 * The following JAXB 1.0 restriction only applies to binding schema to
193 * interfaces/implementation classes.
194 * Since this binding does not require a common runtime system, a JAXB
195 * client application must not attempt to mix runtime objects (<tt>JAXBContext,
196 * Marshaller</tt>, etc. ) from different providers. This does not
197 * mean that the client application isn't portable, it simply means that a
198 * client has to use a runtime system provided by the same provider that was
199 * used to compile the schema.
200 *
201 *
202 * <h3>Discovery of JAXB implementation</h3>
203 * <p>
204 * When one of the <tt>newInstance</tt> methods is called, a JAXB implementation is discovered
205 * by the following steps.
206 *
207 * <ol>
208 *
209 * <li>
210 * For each package/class explicitly passed in to the {@link #newInstance} method, in the order they are specified,
211 * <tt>jaxb.properties</tt> file is looked up in its package, by using the associated classloader —
212 * this is {@link Class#getClassLoader() the owner class loader} for a {@link Class} argument, and for a package
213 * the specified {@link ClassLoader}.
214 *
215 * <p>
216 * If such a file is discovered, it is {@link Properties#load(InputStream) loaded} as a property file, and
217 * the value of the {@link #JAXB_CONTEXT_FACTORY} key will be assumed to be the provider factory class.
218 * This class is then loaded by the associated class loader discussed above.
219 *
220 * <p>
221 * This phase of the look up allows some packages to force the use of a certain JAXB implementation.
222 * (For example, perhaps the schema compiler has generated some vendor extension in the code.)
223 *
224 * <li>
225 * If the system property {@link #JAXB_CONTEXT_FACTORY} exists, then its value is assumed to be the provider
226 * factory class. This phase of the look up enables per-JVM override of the JAXB implementation.
227 *
228 * <li>
229 * Provider of {@link javax.xml.bind.JAXBContextFactory} is loaded using the service-provider loading
230 * facilities, defined by the {@link java.util.ServiceLoader} class, to attempt
231 * to locate and load an implementation of the service using the {@linkplain
232 * java.util.ServiceLoader#load(java.lang.Class) default loading mechanism}: the service-provider loading facility
233 * will use the {@linkplain java.lang.Thread#getContextClassLoader() current thread's context class loader}
234 * to attempt to load the context factory. If the context class loader is null, the
235 * {@linkplain ClassLoader#getSystemClassLoader() system class loader} will be used.
236 * <br>
237 * In case of {@link java.util.ServiceConfigurationError service
238 * configuration error} a {@link javax.xml.bind.JAXBException} will be thrown.
239 * </li>
240 *
241 * <li>
242 * Look for resource {@code /META-INF/services/javax.xml.bind.JAXBContext} using provided class loader.
243 * Methods without class loader parameter use {@code Thread.currentThread().getContextClassLoader()}.
244 * If such a resource exists, its content is assumed to be the provider factory class and must supply
245 * an implementation class containing the following method signatures:
246 *
247 * <pre>
248 *
249 * public static JAXBContext createContext(
250 * String contextPath,
251 * ClassLoader classLoader,
252 * Map<String,Object> properties throws JAXBException
253 *
254 * public static JAXBContext createContext(
255 * Class[] classes,
256 * Map<String,Object> properties ) throws JAXBException
257 * </pre>
258 * This configuration method is deprecated.
259 *
260 * <li>
261 * Finally, if all the steps above fail, then the rest of the look up is unspecified. That said,
262 * the recommended behavior is to simply look for some hard-coded platform default JAXB implementation.
263 * This phase of the look up is so that JavaSE can have its own JAXB implementation as the last resort.
264 * </ol>
265 *
266 * <p>
267 * Once the provider factory class {@link javax.xml.bind.JAXBContextFactory} is discovered, one of its methods
268 * {@link javax.xml.bind.JAXBContextFactory#createContext(String, ClassLoader, java.util.Map)} or
269 * {@link javax.xml.bind.JAXBContextFactory#createContext(Class[], java.util.Map)} is invoked
270 * to create a {@link JAXBContext}.
271 *
272 * <p/>
273 *
274 * @apiNote
275 * <p>Service discovery method using file /META-INF/services/javax.xml.bind.JAXBContext (described in step 4)
276 * and leveraging provider's static methods is supported only to allow backwards compatibility, but it is strongly
277 * recommended to migrate to standard ServiceLoader mechanism (described in step 3).
278 *
279 * @implNote
280 * Within the last step, if Glassfish AS environment detected, its specific service loader is used to find factory class.
281 *
282 * @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li>
283 * <li>Kohsuke Kawaguchi, Sun Microsystems, Inc.</li>
284 * <li>Joe Fialli, Sun Microsystems, Inc.</li></ul>
285 *
286 * @see Marshaller
287 * @see Unmarshaller
288 * @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"
289 * in Java Language Specification</a>
290 *
291 * @since 1.6, JAXB 1.0
292 */
293 public abstract class JAXBContext {
294
295 /**
296 * The name of the property that contains the name of the class capable
297 * of creating new <tt>JAXBContext</tt> objects.
298 */
299 public static final String JAXB_CONTEXT_FACTORY = "javax.xml.bind.JAXBContextFactory";
300
301 protected JAXBContext() {
302 }
303
304
305 /**
306 * <p>
307 * Create a new instance of a <tt>JAXBContext</tt> class.
308 *
309 * <p>
310 * This is a convenience method to invoke the
311 * {@link #newInstance(String,ClassLoader)} method with
312 * the context class loader of the current thread.
313 *
314 * @throws JAXBException if an error was encountered while creating the
315 * <tt>JAXBContext</tt> such as
316 * <ol>
317 * <li>failure to locate either ObjectFactory.class or jaxb.index in the packages</li>
318 * <li>an ambiguity among global elements contained in the contextPath</li>
319 * <li>failure to locate a value for the context factory provider property</li>
320 * <li>mixing schema derived packages from different providers on the same contextPath</li>
321 * </ol>
322 */
323 public static JAXBContext newInstance( String contextPath )
324 throws JAXBException {
325
326 //return newInstance( contextPath, JAXBContext.class.getClassLoader() );
327 return newInstance( contextPath, getContextClassLoader());
328 }
329
330 /**
331 * <p>
332 * Create a new instance of a <tt>JAXBContext</tt> class.
333 *
334 * <p>
335 * The client application must supply a context path which is a list of
336 * colon (':', \u005Cu003A) separated java package names that contain
337 * schema-derived classes and/or fully qualified JAXB-annotated classes.
338 * Schema-derived
339 * code is registered with the JAXBContext by the
340 * ObjectFactory.class generated per package.
341 * Alternatively than being listed in the context path, programmer
342 * annotated JAXB mapped classes can be listed in a
343 * <tt>jaxb.index</tt> resource file, format described below.
344 * Note that a java package can contain both schema-derived classes and
345 * user annotated JAXB classes. Additionally, the java package may
346 * contain JAXB package annotations that must be processed. (see JLS,
347 * Section 7.4.1 "Named Packages").
348 * </p>
349 *
350 * <p>
351 * Every package listed on the contextPath must meet <b>one or both</b> of the
352 * following conditions otherwise a <tt>JAXBException</tt> will be thrown:
353 * </p>
354 * <ol>
355 * <li>it must contain ObjectFactory.class</li>
356 * <li>it must contain jaxb.index</li>
357 * </ol>
358 *
359 * <p>
360 * <b>Format for jaxb.index</b>
361 * <p>
362 * The file contains a newline-separated list of class names.
363 * Space and tab characters, as well as blank
364 * lines, are ignored. The comment character
365 * is '#' (0x23); on each line all characters following the first comment
366 * character are ignored. The file must be encoded in UTF-8. Classes that
367 * are reachable, as defined in {@link #newInstance(Class...)}, from the
368 * listed classes are also registered with JAXBContext.
369 * <p>
370 * Constraints on class name occuring in a <tt>jaxb.index</tt> file are:
371 * <ul>
372 * <li>Must not end with ".class".</li>
373 * <li>Class names are resolved relative to package containing
374 * <tt>jaxb.index</tt> file. Only classes occuring directly in package
375 * containing <tt>jaxb.index</tt> file are allowed.</li>
376 * <li>Fully qualified class names are not allowed.
377 * A qualified class name,relative to current package,
378 * is only allowed to specify a nested or inner class.</li>
379 * </ul>
380 *
381 * <p>
382 * To maintain compatibility with JAXB 1.0 schema to java
383 * interface/implementation binding, enabled by schema customization
384 * <tt>{@literal <jaxb:globalBindings valueClass="false">}</tt>,
385 * the JAXB provider will ensure that each package on the context path
386 * has a <tt>jaxb.properties</tt> file which contains a value for the
387 * <tt>javax.xml.bind.context.factory</tt> property and that all values
388 * resolve to the same provider. This requirement does not apply to
389 * JAXB annotated classes.
390 *
391 * <p>
392 * If there are any global XML element name collisions across the various
393 * packages listed on the <tt>contextPath</tt>, a <tt>JAXBException</tt>
394 * will be thrown.
395 *
396 * <p>
397 * Mixing generated interface/impl bindings from multiple JAXB Providers
398 * in the same context path may result in a <tt>JAXBException</tt>
399 * being thrown.
400 *
401 * <p>
402 * The steps involved in discovering the JAXB implementation is discussed in the class javadoc.
403 *
404 * @param contextPath list of java package names that contain schema
405 * derived class and/or java to schema (JAXB-annotated)
406 * mapped classes
407 * @param classLoader
408 * This class loader will be used to locate the implementation
409 * classes.
410 *
411 * @return a new instance of a <tt>JAXBContext</tt>
412 * @throws JAXBException if an error was encountered while creating the
413 * <tt>JAXBContext</tt> such as
414 * <ol>
415 * <li>failure to locate either ObjectFactory.class or jaxb.index in the packages</li>
416 * <li>an ambiguity among global elements contained in the contextPath</li>
417 * <li>failure to locate a value for the context factory provider property</li>
418 * <li>mixing schema derived packages from different providers on the same contextPath</li>
419 * </ol>
420 */
421 public static JAXBContext newInstance( String contextPath, ClassLoader classLoader ) throws JAXBException {
422
423 return newInstance(contextPath,classLoader,Collections.<String,Object>emptyMap());
424 }
425
426 /**
427 * <p>
428 * Create a new instance of a <tt>JAXBContext</tt> class.
429 *
430 * <p>
431 * This is mostly the same as {@link JAXBContext#newInstance(String, ClassLoader)},
432 * but this version allows you to pass in provider-specific properties to configure
433 * the instantiation of {@link JAXBContext}.
434 *
435 * <p>
436 * The interpretation of properties is up to implementations. Implementations should
437 * throw <tt>JAXBException</tt> if it finds properties that it doesn't understand.
438 *
439 * @param contextPath list of java package names that contain schema derived classes
440 * @param classLoader
441 * This class loader will be used to locate the implementation classes.
442 * @param properties
443 * provider-specific properties. Can be null, which means the same thing as passing
444 * in an empty map.
445 *
446 * @return a new instance of a <tt>JAXBContext</tt>
447 * @throws JAXBException if an error was encountered while creating the
448 * <tt>JAXBContext</tt> such as
449 * <ol>
450 * <li>failure to locate either ObjectFactory.class or jaxb.index in the packages</li>
451 * <li>an ambiguity among global elements contained in the contextPath</li>
452 * <li>failure to locate a value for the context factory provider property</li>
453 * <li>mixing schema derived packages from different providers on the same contextPath</li>
454 * </ol>
455 * @since 1.6, JAXB 2.0
456 */
457 public static JAXBContext newInstance( String contextPath,
458 ClassLoader classLoader,
459 Map<String,?> properties ) throws JAXBException {
460
461 return ContextFinder.find(
462 /* The default property name according to the JAXB spec */
463 JAXB_CONTEXT_FACTORY,
464
465 /* the context path supplied by the client app */
466 contextPath,
467
468 /* class loader to be used */
469 classLoader,
470 properties );
471 }
472
473 // TODO: resurrect this once we introduce external annotations
474 // /**
475 // * <p>
476 // * Create a new instance of a <tt>JAXBContext</tt> class.
477 // *
478 // * <p>
479 // * The client application must supply a list of classes that the new
480 // * context object needs to recognize.
481 // *
482 // * Not only the new context will recognize all the classes specified,
483 // * but it will also recognize any classes that are directly/indirectly
484 // * referenced statically from the specified classes.
485 // *
486 // * For example, in the following Java code, if you do
487 // * <tt>newInstance(Foo.class)</tt>, the newly created {@link JAXBContext}
488 // * will recognize both <tt>Foo</tt> and <tt>Bar</tt>, but not <tt>Zot</tt>:
489 // * <pre>
490 // * class Foo {
491 // * Bar b;
492 // * }
493 // * class Bar { int x; }
494 // * class Zot extends Bar { int y; }
495 // * </pre>
496 // *
497 // * Therefore, a typical client application only needs to specify the
498 // * top-level classes, but it needs to be careful.
499 // *
500 // * TODO: if we are to define other mechanisms, refer to them.
501 // *
502 // * @param externalBindings
503 // * list of external binding files. Can be null or empty if none is used.
504 // * when specified, those files determine how the classes are bound.
505 // *
506 // * @param classesToBeBound
507 // * list of java classes to be recognized by the new {@link JAXBContext}.
508 // * Can be empty, in which case a {@link JAXBContext} that only knows about
509 // * spec-defined classes will be returned.
510 // *
511 // * @return
512 // * A new instance of a <tt>JAXBContext</tt>.
513 // *
514 // * @throws JAXBException
515 // * if an error was encountered while creating the
516 // * <tt>JAXBContext</tt>, such as (but not limited to):
517 // * <ol>
518 // * <li>No JAXB implementation was discovered
519 // * <li>Classes use JAXB annotations incorrectly
520 // * <li>Classes have colliding annotations (i.e., two classes with the same type name)
521 // * <li>Specified external bindings are incorrect
522 // * <li>The JAXB implementation was unable to locate
523 // * provider-specific out-of-band information (such as additional
524 // * files generated at the development time.)
525 // * </ol>
526 // *
527 // * @throws IllegalArgumentException
528 // * if the parameter contains {@code null} (i.e., {@code newInstance(null);})
529 // *
530 // * @since JAXB 2.0
531 // */
532 // public static JAXBContext newInstance( Source[] externalBindings, Class... classesToBeBound )
533 // throws JAXBException {
534 //
535 // // empty class list is not an error, because the context will still include
536 // // spec-specified classes like String and Integer.
537 // // if(classesToBeBound.length==0)
538 // // throw new IllegalArgumentException();
539 //
540 // // but it is an error to have nulls in it.
541 // for( int i=classesToBeBound.length-1; i>=0; i-- )
542 // if(classesToBeBound[i]==null)
543 // throw new IllegalArgumentException();
544 //
545 // return ContextFinder.find(externalBindings,classesToBeBound);
546 // }
547
548 /**
549 * <p>
550 * Create a new instance of a <tt>JAXBContext</tt> class.
551 *
552 * <p>
553 * The client application must supply a list of classes that the new
554 * context object needs to recognize.
555 *
556 * Not only the new context will recognize all the classes specified,
557 * but it will also recognize any classes that are directly/indirectly
558 * referenced statically from the specified classes. Subclasses of
559 * referenced classes nor <tt>@XmlTransient</tt> referenced classes
560 * are not registered with JAXBContext.
561 *
562 * For example, in the following Java code, if you do
563 * <tt>newInstance(Foo.class)</tt>, the newly created {@link JAXBContext}
564 * will recognize both <tt>Foo</tt> and <tt>Bar</tt>, but not <tt>Zot</tt> or <tt>FooBar</tt>:
565 * <pre>
566 * class Foo {
567 * @XmlTransient FooBar c;
568 * Bar b;
569 * }
570 * class Bar { int x; }
571 * class Zot extends Bar { int y; }
572 * class FooBar { }
573 * </pre>
574 *
575 * Therefore, a typical client application only needs to specify the
576 * top-level classes, but it needs to be careful.
577 *
578 * <p>
579 * Note that for each java package registered with JAXBContext,
580 * when the optional package annotations exist, they must be processed.
581 * (see JLS, Section 7.4.1 "Named Packages").
582 *
583 * <p>
584 * The steps involved in discovering the JAXB implementation is discussed in the class javadoc.
585 *
586 * @param classesToBeBound
587 * list of java classes to be recognized by the new {@link JAXBContext}.
588 * Can be empty, in which case a {@link JAXBContext} that only knows about
589 * spec-defined classes will be returned.
590 *
591 * @return
592 * A new instance of a <tt>JAXBContext</tt>.
593 *
594 * @throws JAXBException
595 * if an error was encountered while creating the
596 * <tt>JAXBContext</tt>, such as (but not limited to):
597 * <ol>
598 * <li>No JAXB implementation was discovered
599 * <li>Classes use JAXB annotations incorrectly
600 * <li>Classes have colliding annotations (i.e., two classes with the same type name)
601 * <li>The JAXB implementation was unable to locate
602 * provider-specific out-of-band information (such as additional
603 * files generated at the development time.)
604 * </ol>
605 *
606 * @throws IllegalArgumentException
607 * if the parameter contains {@code null} (i.e., {@code newInstance(null);})
608 *
609 * @since 1.6, JAXB 2.0
610 */
611 public static JAXBContext newInstance( Class<?> ... classesToBeBound )
612 throws JAXBException {
613
614 return newInstance(classesToBeBound,Collections.<String,Object>emptyMap());
615 }
616
617 /**
618 * <p>
619 * Create a new instance of a <tt>JAXBContext</tt> class.
620 *
621 * <p>
622 * An overloading of {@link JAXBContext#newInstance(Class...)}
623 * to configure 'properties' for this instantiation of {@link JAXBContext}.
624 *
625 * <p>
626 * The interpretation of properties is up to implementations. Implementations should
627 * throw <tt>JAXBException</tt> if it finds properties that it doesn't understand.
628 *
629 * @param classesToBeBound
630 * list of java classes to be recognized by the new {@link JAXBContext}.
631 * Can be empty, in which case a {@link JAXBContext} that only knows about
632 * spec-defined classes will be returned.
633 * @param properties
634 * provider-specific properties. Can be null, which means the same thing as passing
635 * in an empty map.
636 *
637 * @return
638 * A new instance of a <tt>JAXBContext</tt>.
639 *
640 * @throws JAXBException
641 * if an error was encountered while creating the
642 * <tt>JAXBContext</tt>, such as (but not limited to):
643 * <ol>
644 * <li>No JAXB implementation was discovered
645 * <li>Classes use JAXB annotations incorrectly
646 * <li>Classes have colliding annotations (i.e., two classes with the same type name)
647 * <li>The JAXB implementation was unable to locate
648 * provider-specific out-of-band information (such as additional
649 * files generated at the development time.)
650 * </ol>
651 *
652 * @throws IllegalArgumentException
653 * if the parameter contains {@code null} (i.e., {@code newInstance(null,someMap);})
654 *
655 * @since 1.6, JAXB 2.0
656 */
657 public static JAXBContext newInstance( Class<?>[] classesToBeBound, Map<String,?> properties )
658 throws JAXBException {
659
660 if (classesToBeBound == null) {
661 throw new IllegalArgumentException();
662 }
663
664 // but it is an error to have nulls in it.
665 for (int i = classesToBeBound.length - 1; i >= 0; i--) {
666 if (classesToBeBound[i] == null) {
667 throw new IllegalArgumentException();
668 }
669 }
670
671 return ContextFinder.find(classesToBeBound,properties);
672 }
673
674 /**
675 * Create an <tt>Unmarshaller</tt> object that can be used to convert XML
676 * data into a java content tree.
677 *
678 * @return an <tt>Unmarshaller</tt> object
679 *
680 * @throws JAXBException if an error was encountered while creating the
681 * <tt>Unmarshaller</tt> object
682 */
683 public abstract Unmarshaller createUnmarshaller() throws JAXBException;
684
685
686 /**
687 * Create a <tt>Marshaller</tt> object that can be used to convert a
688 * java content tree into XML data.
689 *
690 * @return a <tt>Marshaller</tt> object
691 *
692 * @throws JAXBException if an error was encountered while creating the
693 * <tt>Marshaller</tt> object
694 */
695 public abstract Marshaller createMarshaller() throws JAXBException;
696
697
698 /**
699 * {@link Validator} has been made optional and deprecated in JAXB 2.0. Please
700 * refer to the javadoc for {@link Validator} for more detail.
701 * <p>
702 * Create a <tt>Validator</tt> object that can be used to validate a
703 * java content tree against its source schema.
704 *
705 * @return a <tt>Validator</tt> object
706 *
707 * @throws JAXBException if an error was encountered while creating the
708 * <tt>Validator</tt> object
709 * @deprecated since JAXB2.0
710 */
711 public abstract Validator createValidator() throws JAXBException;
712
713 /**
714 * Creates a <tt>Binder</tt> object that can be used for
715 * associative/in-place unmarshalling/marshalling.
716 *
717 * @param domType select the DOM API to use by passing in its DOM Node class.
718 *
719 * @return always a new valid <tt>Binder</tt> object.
720 *
721 * @throws UnsupportedOperationException
722 * if DOM API corresponding to <tt>domType</tt> is not supported by
723 * the implementation.
724 *
725 * @since 1.6, JAXB 2.0
726 */
727 public <T> Binder<T> createBinder(Class<T> domType) {
728 // to make JAXB 1.0 implementations work, this method must not be
729 // abstract
730 throw new UnsupportedOperationException();
731 }
732
733 /**
734 * Creates a <tt>Binder</tt> for W3C DOM.
735 *
736 * @return always a new valid <tt>Binder</tt> object.
737 *
738 * @since 1.6, JAXB 2.0
739 */
740 public Binder<Node> createBinder() {
741 return createBinder(Node.class);
742 }
743
744 /**
745 * Creates a <tt>JAXBIntrospector</tt> object that can be used to
746 * introspect JAXB objects.
747 *
748 * @return
749 * always return a non-null valid <tt>JAXBIntrospector</tt> object.
750 *
751 * @throws UnsupportedOperationException
752 * Calling this method on JAXB 1.0 implementations will throw
753 * an UnsupportedOperationException.
754 *
755 * @since 1.6, JAXB 2.0
756 */
757 public JAXBIntrospector createJAXBIntrospector() {
758 // to make JAXB 1.0 implementations work, this method must not be
759 // abstract
760 throw new UnsupportedOperationException();
761 }
762
763 /**
764 * Generates the schema documents for this context.
765 *
766 * @param outputResolver
767 * this object controls the output to which schemas
768 * will be sent.
769 *
770 * @throws IOException
771 * if {@link SchemaOutputResolver} throws an {@link IOException}.
772 *
773 * @throws UnsupportedOperationException
774 * Calling this method on JAXB 1.0 implementations will throw
775 * an UnsupportedOperationException.
776 *
777 * @since 1.6, JAXB 2.0
778 */
779 public void generateSchema(SchemaOutputResolver outputResolver) throws IOException {
780 // to make JAXB 1.0 implementations work, this method must not be
781 // abstract
782 throw new UnsupportedOperationException();
783 }
784
785 private static ClassLoader getContextClassLoader() {
786 if (System.getSecurityManager() == null) {
787 return Thread.currentThread().getContextClassLoader();
788 } else {
789 return java.security.AccessController.doPrivileged(
790 new java.security.PrivilegedAction<ClassLoader>() {
791 public ClassLoader run() {
792 return Thread.currentThread().getContextClassLoader();
793 }
794 });
795 }
796 }
797
798 }