Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: src/share/classes/javax/lang/model/util/SimpleTypeVisitor8.java
src/share/classes/javax/lang/model/util/SimpleTypeVisitor8.java
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| 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 javax.annotation.processing.SupportedSourceVersion; | |
| 29 import javax.lang.model.SourceVersion; | |
| 30 import javax.lang.model.type.IntersectionType; | |
| 31 import static javax.lang.model.SourceVersion.*; | |
| 32 | |
| 33 /** | |
| 34 * A simple visitor of types with default behavior appropriate for the | |
| 35 * {@link SourceVersion#RELEASE_7 RELEASE_7} source version. | |
| 36 * | |
| 37 * Visit methods corresponding to {@code RELEASE_8} and earlier | |
| 38 * language constructs call {@link #defaultAction defaultAction}, | |
| 39 * passing their arguments to {@code defaultAction}'s corresponding | |
| 40 * parameters. | |
| 41 * | |
| 42 * <p> Methods in this class may be overridden subject to their | |
| 43 * general contract. Note that annotating methods in concrete | |
| 44 * subclasses with {@link java.lang.Override @Override} will help | |
| 45 * ensure that methods are overridden as intended. | |
| 46 * | |
| 47 * <p> <b>WARNING:</b> The {@code TypeVisitor} interface implemented | |
| 48 * by this class may have methods added to it in the future to | |
| 49 * accommodate new, currently unknown, language structures added to | |
| 50 * future versions of the Java™ programming language. | |
| 51 * Therefore, methods whose names begin with {@code "visit"} may be | |
| 52 * added to this class in the future; to avoid incompatibilities, | |
| 53 * classes which extend this class should not declare any instance | |
| 54 * methods with names beginning with {@code "visit"}. | |
| 55 * | |
| 56 * <p>When such a new visit method is added, the default | |
| 57 * implementation in this class will be to call the {@link | |
| 58 * #visitUnknown visitUnknown} method. A new simple type visitor | |
| 59 * class will also be introduced to correspond to the new language | |
| 60 * level; this visitor will have different default behavior for the | |
| 61 * visit method in question. When the new visitor is introduced, all | |
| 62 * or portions of this visitor may be deprecated. | |
| 63 * | |
| 64 * <p>Note that adding a default implementation of a new visit method | |
| 65 * in a visitor class will occur instead of adding a <em>default | |
| 66 * method</em> directly in the visitor interface since a Java SE 8 | |
| 67 * language feature cannot be used to this version of the API since | |
| 68 * this version is required to be runnable on Java SE 7 | |
| 69 * implementations. Future versions of the API that are only required | |
| 70 * to run on Java SE 8 and later may take advantage of default methods | |
| 71 * in this situation. | |
| 72 * | |
| 73 * @param <R> the return type of this visitor's methods. Use {@link | |
| 74 * Void} for visitors that do not need to return results. | |
| 75 * @param <P> the type of the additional parameter to this visitor's | |
| 76 * methods. Use {@code Void} for visitors that do not need an | |
| 77 * additional parameter. | |
| 78 * | |
| 79 * @see SimpleTypeVisitor6 | |
| 80 * @see SimpleTypeVisitor7 | |
| 81 * @since 1.8 | |
| 82 */ | |
| 83 @SupportedSourceVersion(RELEASE_8) | |
| 84 public class SimpleTypeVisitor8<R, P> extends SimpleTypeVisitor7<R, P> { | |
| 85 /** | |
| 86 * Constructor for concrete subclasses; uses {@code null} for the | |
| 87 * default value. | |
| 88 */ | |
| 89 protected SimpleTypeVisitor8(){ | |
| 90 super(null); | |
| 91 } | |
| 92 | |
| 93 /** | |
| 94 * Constructor for concrete subclasses; uses the argument for the | |
| 95 * default value. | |
| 96 * | |
| 97 * @param defaultValue the value to assign to {@link #DEFAULT_VALUE} | |
| 98 */ | |
| 99 protected SimpleTypeVisitor8(R defaultValue){ | |
| 100 super(defaultValue); | |
| 101 } | |
| 102 | |
| 103 /** | |
| 104 * This implementation visits an {@code IntersectionType} by calling | |
| 105 * {@code defaultAction}. | |
| 106 * | |
| 107 * @param t {@inheritDoc} | |
| 108 * @param p {@inheritDoc} | |
| 109 * @return the result of {@code defaultAction} | |
| 110 */ | |
| 111 @Override | |
| 112 public R visitIntersection(IntersectionType t, P p){ | |
| 113 return defaultAction(t, p); | |
| 114 } | |
| 115 } |
