01 /*
02 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
03 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04 *
05 * This code is free software; you can redistribute it and/or modify it
06 * under the terms of the GNU General Public License version 2 only, as
07 * published by the Free Software Foundation. Sun designates this
08 * particular file as subject to the "Classpath" exception as provided
09 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package javax.lang.model.element;
27
28 /**
29 * Indicates that an unknown kind of element was encountered. This
30 * can occur if the language evolves and new kinds of elements are
31 * added to the {@code Element} hierarchy. May be thrown by an
32 * {@linkplain ElementVisitor element visitor} to indicate that the
33 * visitor was created for a prior version of the language.
34 *
35 * @author Joseph D. Darcy
36 * @author Scott Seligman
37 * @author Peter von der Ahé
38 * @version 1.9 07/05/05
39 * @see ElementVisitor#visitUnknown
40 * @since 1.6
41 */
42 public class UnknownElementException extends RuntimeException {
43
44 private static final long serialVersionUID = 269L;
45
46 private transient Element element;
47 private transient Object parameter;
48
49 /**
50 * Creates a new {@code UnknownElementException}. The {@code p}
51 * parameter may be used to pass in an additional argument with
52 * information about the context in which the unknown element was
53 * encountered; for example, the visit methods of {@link
54 * ElementVisitor} may pass in their additional parameter.
55 *
56 * @param e the unknown element, may be {@code null}
57 * @param p an additional parameter, may be {@code null}
58 */
59 public UnknownElementException(Element e, Object p) {
60 super ("Unknown element: " + e);
61 element = e;
62 this .parameter = p;
63 }
64
65 /**
66 * Returns the unknown element.
67 * The value may be unavailable if this exception has been
68 * serialized and then read back in.
69 *
70 * @return the unknown element, or {@code null} if unavailable
71 */
72 public Element getUnknownElement() {
73 return element;
74 }
75
76 /**
77 * Returns the additional argument.
78 *
79 * @return the additional argument
80 */
81 public Object getArgument() {
82 return parameter;
83 }
84 }
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