1 /* 2 * Copyright (c) 2010, 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 */ 25 26 package javax.lang.model.util; 27 28 import javax.lang.model.element.*; 29 import javax.annotation.processing.SupportedSourceVersion; 30 import static javax.lang.model.element.ElementKind.*; 31 import javax.lang.model.SourceVersion; 32 import static javax.lang.model.SourceVersion.*; 33 34 /** 35 * A simple visitor of program elements with default behavior 36 * appropriate for the {@link SourceVersion#RELEASE_7 RELEASE_7} 37 * source version. 38 * 39 * Visit methods corresponding to {@code RELEASE_7} and earlier 40 * language constructs call {@link #defaultAction defaultAction}, 41 * passing their arguments to {@code defaultAction}'s corresponding 42 * 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 in the 51 * future to accommodate new, currently unknown, language structures 52 * added to future versions of the Java™ programming language. 53 * Therefore, methods whose names begin with {@code "visit"} may be 54 * added to this class in the future; to avoid incompatibilities, 55 * classes which extend this class should not declare any instance 56 * methods with names beginning with {@code "visit"}. 57 * 58 * <p>When such a new visit method is added, the default 59 * implementation in this class will be to call the {@link 60 * #visitUnknown visitUnknown} method. A new simple element visitor 61 * class will also be introduced to correspond to the new language 62 * level; this visitor will have different default behavior for the 63 * visit method in question. When the new visitor is introduced, all 64 * or portions of this visitor may be deprecated. 65 * 66 * @param <R> the return type of this visitor's methods. Use {@code Void} 67 * for visitors that do not need to return results. 68 * @param <P> the type of the additional parameter to this visitor's methods. Use {@code Void} 69 * for visitors that do not need an additional parameter. 70 * 71 * @see SimpleElementVisitor6 72 * @since 1.7 73 */ 74 @SupportedSourceVersion(RELEASE_7) 75 public class SimpleElementVisitor7<R, P> extends SimpleElementVisitor6<R, P> { 76 /** 77 * Constructor for concrete subclasses; uses {@code null} for the 78 * default value. 79 */ 80 protected SimpleElementVisitor7(){ 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 SimpleElementVisitor7(R defaultValue){ 91 super(defaultValue); 92 } 93 94 /** 95 * This implementation calls {@code defaultAction}. 96 * 97 * @param e {@inheritDoc} 98 * @param p {@inheritDoc} 99 * @return the result of {@code defaultAction} 100 */ 101 @Override 102 public R visitVariable(VariableElement e, P p) { 103 return defaultAction(e, p); 104 } 105 }