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.lang.model.type.*; 29 30 /** 31 * A skeletal visitor of types with default behavior appropriate for 32 * the {@link javax.lang.model.SourceVersion#RELEASE_8 RELEASE_8} 33 * source version. 34 * 35 * <p> <b>WARNING:</b> The {@code TypeVisitor} interface implemented 36 * by this class may have methods added to it in the future to 37 * accommodate new, currently unknown, language structures added to 38 * future versions of the Java™ programming language. 39 * Therefore, methods whose names begin with {@code "visit"} may be 40 * added to this class in the future; to avoid incompatibilities, 41 * classes which extend this class should not declare any instance 42 * methods with names beginning with {@code "visit"}. 43 * 44 * <p>When such a new visit method is added, the default 45 * implementation in this class will be to call the {@link 46 * #visitUnknown visitUnknown} method. A new abstract type visitor 47 * class will also be introduced to correspond to the new language 48 * level; this visitor will have different default behavior for the 49 * visit method in question. When the new visitor is introduced, all 50 * or portions of this visitor may be deprecated. 51 * 52 * <p>Note that adding a default implementation of a new visit method 53 * in a visitor class will occur instead of adding a <em>default 54 * method</em> directly in the visitor interface since a Java SE 8 55 * language feature cannot be used to this version of the API since 56 * this version is required to be runnable on Java SE 7 57 * implementations. Future versions of the API that are only required 58 * to run on Java SE 8 and later may take advantage of default methods 59 * in this situation. 60 * 61 * @param <R> the return type of this visitor's methods. Use {@link 62 * Void} for visitors that do not need to return results. 63 * @param <P> the type of the additional parameter to this visitor's 64 * methods. Use {@code Void} for visitors that do not need an 65 * additional parameter. 66 * 67 * @see AbstractTypeVisitor6 68 * @see AbstractTypeVisitor7 69 * @since 1.8 70 */ 71 public abstract class AbstractTypeVisitor8<R, P> extends AbstractTypeVisitor7<R, P> { 72 /** 73 * Constructor for concrete subclasses to call. 74 */ AbstractTypeVisitor8()75 protected AbstractTypeVisitor8() { 76 super(); 77 } 78 79 /** 80 * Visits an {@code IntersectionType} in a manner defined by a subclass. 81 * 82 * @param t {@inheritDoc} 83 * @param p {@inheritDoc} 84 * @return the result of the visit as defined by a subclass 85 */ visitIntersection(IntersectionType t, P p)86 public abstract R visitIntersection(IntersectionType t, P p); 87 } 88