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 source versions {@link SourceVersion#RELEASE_9 35 * RELEASE_9} through {@link SourceVersion#RELEASE_12 RELEASE_12}. 36 * 37 * Visit methods call {@link #defaultAction 38 * defaultAction} passing their arguments to {@code defaultAction}'s 39 * corresponding parameters. 40 * 41 * <p> Methods in this class may be overridden subject to their 42 * general contract. Note that annotating methods in concrete 43 * subclasses with {@link java.lang.Override @Override} will help 44 * ensure that methods are overridden as intended. 45 * 46 * <p> <b>WARNING:</b> The {@code AnnotationValueVisitor} interface 47 * implemented by this class may have methods added to it in the 48 * future to accommodate new, currently unknown, language structures 49 * added to future versions of the Java™ programming language. 50 * Therefore, methods whose names begin with {@code "visit"} may be 51 * added to this class in the future; to avoid incompatibilities, 52 * classes which extend this class should not declare any instance 53 * methods with names beginning with {@code "visit"}. 54 * 55 * <p>When such a new visit method is added, the default 56 * implementation in this class will be to call the {@link 57 * #visitUnknown visitUnknown} method. A new simple annotation 58 * value visitor class will also be introduced to correspond to the 59 * new language level; this visitor will have different default 60 * behavior for the visit method in question. When the new visitor is 61 * introduced, all or portions of this visitor may be deprecated. 62 * 63 * @param <R> the return type of this visitor's methods 64 * @param <P> the type of the additional parameter to this visitor's methods. 65 * 66 * @see SimpleAnnotationValueVisitor6 67 * @see SimpleAnnotationValueVisitor7 68 * @see SimpleAnnotationValueVisitor8 69 * @since 9 70 */ 71 @SupportedSourceVersion(RELEASE_12) 72 public class SimpleAnnotationValueVisitor9<R, P> extends SimpleAnnotationValueVisitor8<R, P> { 73 /** 74 * Constructor for concrete subclasses; uses {@code null} for the 75 * default value. 76 */ 77 protected SimpleAnnotationValueVisitor9() { 78 super(null); 79 } 80 81 /** 82 * Constructor for concrete subclasses; uses the argument for the 83 * default value. 84 * 85 * @param defaultValue the value to assign to {@link #DEFAULT_VALUE} 86 */ 87 protected SimpleAnnotationValueVisitor9(R defaultValue) { 88 super(defaultValue); 89 } 90 }