Thu, 31 Aug 2017 15:17:03 +0800
merge
1 /*
2 * Copyright (c) 2005, 2009, 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 javax.lang.model.element;
28 import javax.lang.model.UnknownEntityException;
30 /**
31 * Indicates that an unknown kind of element was encountered. This
32 * can occur if the language evolves and new kinds of elements are
33 * added to the {@code Element} hierarchy. May be thrown by an
34 * {@linkplain ElementVisitor element visitor} to indicate that the
35 * visitor was created for a prior version of the language.
36 *
37 * @author Joseph D. Darcy
38 * @author Scott Seligman
39 * @author Peter von der Ahé
40 * @see ElementVisitor#visitUnknown
41 * @since 1.6
42 */
43 public class UnknownElementException extends UnknownEntityException {
45 private static final long serialVersionUID = 269L;
47 private transient Element element;
48 private transient Object parameter;
50 /**
51 * Creates a new {@code UnknownElementException}. The {@code p}
52 * parameter may be used to pass in an additional argument with
53 * information about the context in which the unknown element was
54 * encountered; for example, the visit methods of {@link
55 * ElementVisitor} may pass in their additional parameter.
56 *
57 * @param e the unknown element, may be {@code null}
58 * @param p an additional parameter, may be {@code null}
59 */
60 public UnknownElementException(Element e, Object p) {
61 super("Unknown element: " + e);
62 element = e;
63 this.parameter = p;
64 }
66 /**
67 * Returns the unknown element.
68 * The value may be unavailable if this exception has been
69 * serialized and then read back in.
70 *
71 * @return the unknown element, or {@code null} if unavailable
72 */
73 public Element getUnknownElement() {
74 return element;
75 }
77 /**
78 * Returns the additional argument.
79 *
80 * @return the additional argument
81 */
82 public Object getArgument() {
83 return parameter;
84 }
85 }