Tue, 09 Oct 2012 19:10:00 -0700
8000663: clean up langtools imports
Reviewed-by: darcy
1 /*
2 * Copyright (c) 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 javax.lang.model.util;
28 import javax.lang.model.element.*;
29 import javax.annotation.processing.SupportedSourceVersion;
30 import static javax.lang.model.SourceVersion.*;
31 import javax.lang.model.SourceVersion;
33 /**
34 * A visitor of program elements based on their {@linkplain
35 * ElementKind kind} with default behavior appropriate for the {@link
36 * SourceVersion#RELEASE_8 RELEASE_8} source version. For {@linkplain
37 * Element elements} <tt><i>XYZ</i></tt> that may have more than one
38 * kind, the <tt>visit<i>XYZ</i></tt> methods in this class delegate
39 * to the <tt>visit<i>XYZKind</i></tt> method corresponding to the
40 * first argument's kind. The <tt>visit<i>XYZKind</i></tt> methods
41 * call {@link #defaultAction defaultAction}, passing their arguments
42 * to {@code defaultAction}'s corresponding parameters.
43 *
44 * <p> Methods in this class may be overridden subject to their
45 * general contract. Note that annotating methods in concrete
46 * subclasses with {@link java.lang.Override @Override} will help
47 * ensure that methods are overridden as intended.
48 *
49 * <p> <b>WARNING:</b> The {@code ElementVisitor} interface
50 * implemented by this class may have methods added to it or the
51 * {@code ElementKind} {@code enum} used in this case may have
52 * constants added to it in the future to accommodate new, currently
53 * unknown, language structures added to future versions of the
54 * Java™ programming language. Therefore, methods whose names
55 * begin with {@code "visit"} may be added to this class in the
56 * future; to avoid incompatibilities, classes which extend this class
57 * should not declare any instance methods with names beginning with
58 * {@code "visit"}.
59 *
60 * <p>When such a new visit method is added, the default
61 * implementation in this class will be to call the {@link
62 * #visitUnknown visitUnknown} method. A new abstract element kind
63 * visitor class will also be introduced to correspond to the new
64 * language level; this visitor will have different default behavior
65 * for the visit method in question. When the new visitor is
66 * introduced, all or portions of this visitor may be deprecated.
67 *
68 * @param <R> the return type of this visitor's methods. Use {@link
69 * Void} for visitors that do not need to return results.
70 * @param <P> the type of the additional parameter to this visitor's
71 * methods. Use {@code Void} for visitors that do not need an
72 * additional parameter.
73 *
74 * @see ElementKindVisitor6
75 * @see ElementKindVisitor7
76 * @since 1.8
77 */
78 @SupportedSourceVersion(RELEASE_8)
79 public class ElementKindVisitor8<R, P> extends ElementKindVisitor7<R, P> {
80 /**
81 * Constructor for concrete subclasses; uses {@code null} for the
82 * default value.
83 */
84 protected ElementKindVisitor8() {
85 super(null);
86 }
88 /**
89 * Constructor for concrete subclasses; uses the argument for the
90 * default value.
91 *
92 * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
93 */
94 protected ElementKindVisitor8(R defaultValue) {
95 super(defaultValue);
96 }
97 }