SimpleElementVisitor9.java revision 3189:70ac078df098 
1/*
2 * Copyright (c) 2011, 2014, 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 */
25
26package javax.lang.model.util;
27
28import javax.annotation.processing.SupportedSourceVersion;
29import javax.lang.model.SourceVersion;
30import static javax.lang.model.SourceVersion.*;
31
32/**
33 * A simple visitor of program elements with default behavior
34 * appropriate for the {@link SourceVersion#RELEASE_9 RELEASE_9}
35 * source version.
36 *
37 * Visit methods corresponding to {@code RELEASE_9} and earlier
38 * language constructs call {@link #defaultAction defaultAction},
39 * passing their arguments to {@code defaultAction}'s corresponding
40 * parameters.
41 *
42 * <p> Methods in this class may be overridden subject to their
43 * general contract.  Note that annotating methods in concrete
44 * subclasses with {@link java.lang.Override @Override} will help
45 * ensure that methods are overridden as intended.
46 *
47 * <p> <b>WARNING:</b> The {@code ElementVisitor} interface
48 * implemented by this class may have methods added to it in the
49 * future to accommodate new, currently unknown, language structures
50 * added to future versions of the Java&trade; programming language.
51 * Therefore, methods whose names begin with {@code "visit"} may be
52 * added to this class in the future; to avoid incompatibilities,
53 * classes which extend this class should not declare any instance
54 * methods with names beginning with {@code "visit"}.
55 *
56 * <p>When such a new visit method is added, the default
57 * implementation in this class will be to call the {@link
58 * #visitUnknown visitUnknown} method.  A new simple element visitor
59 * class will also be introduced to correspond to the new language
60 * level; this visitor will have different default behavior for the
61 * visit method in question.  When the new visitor is introduced, all
62 * or portions of this visitor may be deprecated.
63 *
64 * @param <R> the return type of this visitor's methods.  Use {@code Void}
65 *             for visitors that do not need to return results.
66 * @param <P> the type of the additional parameter to this visitor's methods.  Use {@code Void}
67 *              for visitors that do not need an additional parameter.
68 *
69 * @see SimpleElementVisitor6
70 * @see SimpleElementVisitor7
71 * @see SimpleElementVisitor8
72 * @since 9
73 */
74@SupportedSourceVersion(RELEASE_9)
75public class SimpleElementVisitor9<R, P> extends SimpleElementVisitor8<R, P> {
76    /**
77     * Constructor for concrete subclasses; uses {@code null} for the
78     * default value.
79     */
80    protected SimpleElementVisitor9(){
81        super(null);
82    }
83
84    /**
85     * Constructor for concrete subclasses; uses the argument for the
86     * default value.
87     *
88     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
89     */
90    protected SimpleElementVisitor9(R defaultValue){
91        super(defaultValue);
92    }
93}
94