1 /* 2 * Copyright (c) 2010, 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.type.*; 29 import javax.annotation.processing.SupportedSourceVersion; 30 import static javax.lang.model.element.ElementKind.*; 31 import static javax.lang.model.SourceVersion.*; 32 import javax.lang.model.SourceVersion; 33 34 /** 35 * A visitor of types based on their {@linkplain TypeKind kind} with 36 * default behavior appropriate for the {@link SourceVersion#RELEASE_7 37 * RELEASE_7} source version. For {@linkplain 38 * TypeMirror types} <tt><i>XYZ</i></tt> that may have more than one 39 * kind, the <tt>visit<i>XYZ</i></tt> methods in this class delegate 40 * to the <tt>visit<i>XYZKind</i></tt> method corresponding to the 41 * first argument's kind. The <tt>visit<i>XYZKind</i></tt> methods 42 * call {@link #defaultAction defaultAction}, passing their arguments 43 * to {@code defaultAction}'s corresponding parameters. 44 * 45 * <p> Methods in this class may be overridden subject to their 46 * general contract. Note that annotating methods in concrete 47 * subclasses with {@link java.lang.Override @Override} will help 48 * ensure that methods are overridden as intended. 49 * 50 * <p> <b>WARNING:</b> The {@code TypeVisitor} interface implemented 51 * by this class may have methods added to it in the future to 52 * accommodate new, currently unknown, language structures added to 53 * future versions of the Java™ programming language. 54 * Therefore, methods whose names begin with {@code "visit"} may be 55 * added to this class in the future; to avoid incompatibilities, 56 * classes which extend this class should not declare any instance 57 * methods with names beginning with {@code "visit"}. 58 * 59 * <p>When such a new visit method is added, the default 60 * implementation in this class will be to call the {@link 61 * #visitUnknown visitUnknown} method. A new type kind visitor class 62 * will also be introduced to correspond to the new language level; 63 * this visitor will have different default behavior for the visit 64 * method in question. When the new visitor is introduced, all or 65 * portions of this visitor may be deprecated. 66 * 67 * @param <R> the return type of this visitor's methods. Use {@link 68 * Void} for visitors that do not need to return results. 69 * @param <P> the type of the additional parameter to this visitor's 70 * methods. Use {@code Void} for visitors that do not need an 71 * additional parameter. 72 * 73 * @see TypeKindVisitor6 74 * @since 1.7 75 */ 76 @SupportedSourceVersion(RELEASE_7) 77 public class TypeKindVisitor7<R, P> extends TypeKindVisitor6<R, P> { 78 /** 79 * Constructor for concrete subclasses to call; uses {@code null} 80 * for the default value. 81 */ 82 protected TypeKindVisitor7() { 83 super(null); 84 } 85 86 /** 87 * Constructor for concrete subclasses to call; uses the argument 88 * for the default value. 89 * 90 * @param defaultValue the value to assign to {@link #DEFAULT_VALUE} 91 */ 92 protected TypeKindVisitor7(R defaultValue) { 93 super(defaultValue); 94 } 95 }