1 /* 2 * Copyright (c) 2011, 2013, 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 static javax.lang.model.SourceVersion.*; 29 import javax.lang.model.SourceVersion; 30 import javax.annotation.processing.SupportedSourceVersion; 31 32 /** 33 * A skeletal visitor for annotation values with default behavior 34 * appropriate for the {@link SourceVersion#RELEASE_8 RELEASE_8} 35 * source version. 36 * 37 * <p> <b>WARNING:</b> The {@code AnnotationValueVisitor} interface 38 * implemented by this class may have methods added to it in the 39 * future to accommodate new, currently unknown, language structures 40 * added to future versions of the Java™ programming language. 41 * Therefore, methods whose names begin with {@code "visit"} may be 42 * added to this class in the future; to avoid incompatibilities, 43 * classes which extend this class should not declare any instance 44 * methods with names beginning with {@code "visit"}. 45 * 46 * <p>When such a new visit method is added, the default 47 * implementation in this class will be to call the {@link 48 * #visitUnknown visitUnknown} method. A new abstract annotation 49 * value visitor class will also be introduced to correspond to the 50 * new language level; this visitor will have different default 51 * behavior for the visit method in question. When the new visitor is 52 * introduced, all or portions of this visitor may be deprecated. 53 * 54 * <p>Note that adding a default implementation of a new visit method 55 * in a visitor class will occur instead of adding a <em>default 56 * method</em> directly in the visitor interface since a Java SE 8 57 * language feature cannot be used to this version of the API since 58 * this version is required to be runnable on Java SE 7 59 * implementations. Future versions of the API that are only required 60 * to run on Java SE 8 and later may take advantage of default methods 61 * in this situation. 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 AbstractAnnotationValueVisitor6 67 * @see AbstractAnnotationValueVisitor7 68 * @since 1.8 69 */ 70 @SupportedSourceVersion(RELEASE_8) 71 public abstract class AbstractAnnotationValueVisitor8<R, P> extends AbstractAnnotationValueVisitor7<R, P> { 72 73 /** 74 * Constructor for concrete subclasses to call. 75 */ 76 protected AbstractAnnotationValueVisitor8() { 77 super(); 78 } 79 }