Wed, 27 Apr 2016 01:27:09 +0800
Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/jaxws/
changeset: 657:d47a47f961ee
tag: jdk8u25-b17
1 /*
2 * Copyright (c) 1997, 2011, 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
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
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 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.xml.internal.bind.api;
28 import javax.xml.bind.JAXBContext;
29 import javax.xml.bind.Unmarshaller;
30 import javax.xml.bind.ValidationEventHandler;
31 import javax.xml.bind.annotation.XmlAnyElement;
33 import com.sun.istack.internal.NotNull;
34 import com.sun.istack.internal.Nullable;
36 /**
37 * Dynamically locates classes to represent elements discovered during the unmarshalling.
38 *
39 * <p>
40 * <b>THIS INTERFACE IS SUBJECT TO CHANGE WITHOUT NOTICE.</b>
41 *
42 * <h2>Background</h2>
43 * <p>
44 * {@link JAXBContext#newInstance(Class...)} requires that application informs JAXB
45 * about all the classes that it may see in the instance document. While this allows
46 * JAXB to take time to optimize the unmarshalling, it is sometimes inconvenient
47 * for applications.
48 *
49 * <p>
50 * This is where {@link ClassResolver} comes to resucue.
51 *
52 * <p>
53 * A {@link ClassResolver} instance can be specified on {@link Unmarshaller} via
54 * {@link Unmarshaller#setProperty(String, Object)} as follows:
55 *
56 * <pre>
57 * unmarshaller.setProperty( ClassResolver.class.getName(), new MyClassResolverImpl() );
58 * </pre>
59 *
60 * <p>
61 * When an {@link Unmarshaller} encounters (i) an unknown root element or (ii) unknown
62 * elements where unmarshaller is trying to unmarshal into {@link XmlAnyElement} with
63 * <tt>lax=true</tt>, unmarshaller calls {@link #resolveElementName(String, String)}
64 * method to see if the application may be able to supply a class that corresponds
65 * to that class.
66 *
67 * <p>
68 * When a {@link Class} is returned, a new {@link JAXBContext} is created with
69 * all the classes known to it so far, plus a new class returned. This operation
70 * may fail (for example because of some conflicting annotations.) This failure
71 * is handled just like {@link Exception}s thrown from
72 * {@link ClassResolver#resolveElementName(String, String)}.
73 *
74 * @author Kohsuke Kawaguchi
75 * @since 2.1
76 */
77 public abstract class ClassResolver {
78 /**
79 * JAXB calls this method when it sees an unknown element.
80 *
81 * <p>
82 * See the class javadoc for details.
83 *
84 * @param nsUri
85 * Namespace URI of the unknown element. Can be empty but never null.
86 * @param localName
87 * Local name of the unknown element. Never be empty nor null.
88 *
89 * @return
90 * If a non-null class is returned, it will be used to unmarshal this element.
91 * If null is returned, the resolution is assumed to be failed, and
92 * the unmarshaller will behave as if there was no {@link ClassResolver}
93 * to begin with (that is, to report it to {@link ValidationEventHandler},
94 * then move on.)
95 *
96 * @throws Exception
97 * Throwing any {@link RuntimeException} causes the unmarshaller to stop
98 * immediately. The exception will be propagated up the call stack.
99 * Throwing any other checked {@link Exception} results in the error
100 * reproted to {@link ValidationEventHandler} (just like any other error
101 * during the unmarshalling.)
102 */
103 public abstract @Nullable Class<?> resolveElementName(@NotNull String nsUri, @NotNull String localName) throws Exception;
104 }