1 /*
2 * Copyright (c) 2011, 2018, 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
26 package javax.lang.model.util;
27
28 import javax.annotation.processing.SupportedSourceVersion;
29 import javax.lang.model.SourceVersion;
30 import static javax.lang.model.SourceVersion.*;
31
32 /**
33 * A simple visitor for annotation values with default behavior
34 * appropriate for the {@link SourceVersion#RELEASE_8 RELEASE_8}
35 * source version. Visit methods call {@link #defaultAction
36 * defaultAction} passing their arguments to {@code defaultAction}'s
37 * corresponding parameters.
38 *
39 * <p> Methods in this class may be overridden subject to their
40 * general contract. Note that annotating methods in concrete
41 * subclasses with {@link java.lang.Override @Override} will help
42 * ensure that methods are overridden as intended.
43 *
44 * <p> <b>WARNING:</b> The {@code AnnotationValueVisitor} interface
45 * implemented by this class may have methods added to it in the
46 * future to accommodate new, currently unknown, language structures
47 * added to future versions of the Java™ programming language.
48 * Therefore, methods whose names begin with {@code "visit"} may be
49 * added to this class in the future; to avoid incompatibilities,
50 * classes which extend this class should not declare any instance
51 * methods with names beginning with {@code "visit"}.
52 *
53 * <p>When such a new visit method is added, the default
54 * implementation in this class will be to call the {@link
55 * #visitUnknown visitUnknown} method. A new simple annotation
56 * value visitor class will also be introduced to correspond to the
57 * new language level; this visitor will have different default
58 * behavior for the visit method in question. When the new visitor is
59 * introduced, all or portions of this visitor may be deprecated.
60 *
61 * @param <R> the return type of this visitor's methods
62 * @param <P> the type of the additional parameter to this visitor's methods.
63 *
64 * @see SimpleAnnotationValueVisitor6
65 * @see SimpleAnnotationValueVisitor7
66 * @see SimpleAnnotationValueVisitor8
67 * @since 1.8
68 */
69 @SupportedSourceVersion(RELEASE_8)
70 public class SimpleAnnotationValueVisitor8<R, P> extends SimpleAnnotationValueVisitor7<R, P> {
71 /**
72 * Constructor for concrete subclasses; uses {@code null} for the
73 * default value.
74 */
75 @SuppressWarnings("deprecation") // Superclass constructor deprecated
76 protected SimpleAnnotationValueVisitor8() {
77 super(null);
78 }
79
80 /**
81 * Constructor for concrete subclasses; uses the argument for the
82 * default value.
83 *
84 * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
85 */
86 @SuppressWarnings("deprecation") // Superclass constructor deprecated
87 protected SimpleAnnotationValueVisitor8(R defaultValue) {
88 super(defaultValue);
89 }
90 }