| /* |
| * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.lang.model.util; |
| |
| import javax.lang.model.element.*; |
| import javax.annotation.processing.SupportedSourceVersion; |
| import javax.lang.model.SourceVersion; |
| import static javax.lang.model.SourceVersion.*; |
| |
| |
| /** |
| * A simple visitor of program elements with default behavior |
| * appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6} |
| * source version. |
| * |
| * Visit methods corresponding to {@code RELEASE_6} language |
| * constructs call {@link #defaultAction defaultAction}, passing their |
| * arguments to {@code defaultAction}'s corresponding parameters. |
| * |
| * For constructs introduced in {@code RELEASE_7} and later, {@code |
| * visitUnknown} is called instead. |
| * |
| * <p> Methods in this class may be overridden subject to their |
| * general contract. Note that annotating methods in concrete |
| * subclasses with {@link java.lang.Override @Override} will help |
| * ensure that methods are overridden as intended. |
| * |
| * <p> <b>WARNING:</b> The {@code ElementVisitor} interface |
| * implemented by this class may have methods added to it in the |
| * future to accommodate new, currently unknown, language structures |
| * added to future versions of the Java™ programming language. |
| * Therefore, methods whose names begin with {@code "visit"} may be |
| * added to this class in the future; to avoid incompatibilities, |
| * classes which extend this class should not declare any instance |
| * methods with names beginning with {@code "visit"}. |
| * |
| * <p>When such a new visit method is added, the default |
| * implementation in this class will be to call the {@link |
| * #visitUnknown visitUnknown} method. A new simple element visitor |
| * class will also be introduced to correspond to the new language |
| * level; this visitor will have different default behavior for the |
| * visit method in question. When the new visitor is introduced, all |
| * or portions of this visitor may be deprecated. |
| * |
| * <p>Note that adding a default implementation of a new visit method |
| * in a visitor class will occur instead of adding a <em>default |
| * method</em> directly in the visitor interface since a Java SE 8 |
| * language feature cannot be used to this version of the API since |
| * this version is required to be runnable on Java SE 7 |
| * implementations. Future versions of the API that are only required |
| * to run on Java SE 8 and later may take advantage of default methods |
| * in this situation. |
| * |
| * @param <R> the return type of this visitor's methods. Use {@code Void} |
| * for visitors that do not need to return results. |
| * @param <P> the type of the additional parameter to this visitor's methods. Use {@code Void} |
| * for visitors that do not need an additional parameter. |
| * |
| * @author Joseph D. Darcy |
| * @author Scott Seligman |
| * @author Peter von der Ahé |
| * |
| * @see SimpleElementVisitor7 |
| * @see SimpleElementVisitor8 |
| * @see SimpleElementVisitor9 |
| * @since 1.6 |
| * @deprecated Release 6 is obsolete; update to a visitor for a newer |
| * release level. |
| */ |
| @Deprecated |
| @SupportedSourceVersion(RELEASE_6) |
| public class SimpleElementVisitor6<R, P> extends AbstractElementVisitor6<R, P> { |
| /** |
| * Default value to be returned; {@link #defaultAction |
| * defaultAction} returns this value unless the method is |
| * overridden. |
| */ |
| protected final R DEFAULT_VALUE; |
| |
| /** |
| * Constructor for concrete subclasses; uses {@code null} for the |
| * default value. |
| */ |
| protected SimpleElementVisitor6(){ |
| DEFAULT_VALUE = null; |
| } |
| |
| /** |
| * Constructor for concrete subclasses; uses the argument for the |
| * default value. |
| * |
| * @param defaultValue the value to assign to {@link #DEFAULT_VALUE} |
| */ |
| protected SimpleElementVisitor6(R defaultValue){ |
| DEFAULT_VALUE = defaultValue; |
| } |
| /** |
| * The default action for visit methods. The implementation in |
| * this class just returns {@link #DEFAULT_VALUE}; subclasses will |
| * commonly override this method. |
| * |
| * @param e the element to process |
| * @param p a visitor-specified parameter |
| * @return {@code DEFAULT_VALUE} unless overridden |
| */ |
| protected R defaultAction(Element e, P p) { |
| return DEFAULT_VALUE; |
| } |
| |
| /** |
| * {@inheritDoc} This implementation calls {@code defaultAction}. |
| * |
| * @param e {@inheritDoc} |
| * @param p {@inheritDoc} |
| * @return the result of {@code defaultAction} |
| */ |
| public R visitPackage(PackageElement e, P p) { |
| return defaultAction(e, p); |
| } |
| |
| /** |
| * {@inheritDoc} This implementation calls {@code defaultAction}. |
| * |
| * @param e {@inheritDoc} |
| * @param p {@inheritDoc} |
| * @return the result of {@code defaultAction} |
| */ |
| public R visitType(TypeElement e, P p) { |
| return defaultAction(e, p); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * This implementation calls {@code defaultAction}, unless the |
| * element is a {@code RESOURCE_VARIABLE} in which case {@code |
| * visitUnknown} is called. |
| * |
| * @param e {@inheritDoc} |
| * @param p {@inheritDoc} |
| * @return the result of {@code defaultAction} or {@code visitUnknown} |
| */ |
| public R visitVariable(VariableElement e, P p) { |
| if (e.getKind() != ElementKind.RESOURCE_VARIABLE) |
| return defaultAction(e, p); |
| else |
| return visitUnknown(e, p); |
| } |
| |
| /** |
| * {@inheritDoc} This implementation calls {@code defaultAction}. |
| * |
| * @param e {@inheritDoc} |
| * @param p {@inheritDoc} |
| * @return the result of {@code defaultAction} |
| */ |
| public R visitExecutable(ExecutableElement e, P p) { |
| return defaultAction(e, p); |
| } |
| |
| /** |
| * {@inheritDoc} This implementation calls {@code defaultAction}. |
| * |
| * @param e {@inheritDoc} |
| * @param p {@inheritDoc} |
| * @return the result of {@code defaultAction} |
| */ |
| public R visitTypeParameter(TypeParameterElement e, P p) { |
| return defaultAction(e, p); |
| } |
| } |