1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/javax/lang/model/util/ElementKindVisitor6.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,413 @@
1.4 +/*
1.5 + * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package javax.lang.model.util;
1.30 +
1.31 +import javax.lang.model.element.*;
1.32 +import static javax.lang.model.element.ElementKind.*;
1.33 +import javax.annotation.processing.SupportedSourceVersion;
1.34 +import static javax.lang.model.SourceVersion.*;
1.35 +import javax.lang.model.SourceVersion;
1.36 +
1.37 +
1.38 +/**
1.39 + * A visitor of program elements based on their {@linkplain
1.40 + * ElementKind kind} with default behavior appropriate for the {@link
1.41 + * SourceVersion#RELEASE_6 RELEASE_6} source version. For {@linkplain
1.42 + * Element elements} <tt><i>XYZ</i></tt> that may have more than one
1.43 + * kind, the <tt>visit<i>XYZ</i></tt> methods in this class delegate
1.44 + * to the <tt>visit<i>XYZKind</i></tt> method corresponding to the
1.45 + * first argument's kind. The <tt>visit<i>XYZKind</i></tt> methods
1.46 + * call {@link #defaultAction defaultAction}, passing their arguments
1.47 + * to {@code defaultAction}'s corresponding parameters.
1.48 + *
1.49 + * <p> Methods in this class may be overridden subject to their
1.50 + * general contract. Note that annotating methods in concrete
1.51 + * subclasses with {@link java.lang.Override @Override} will help
1.52 + * ensure that methods are overridden as intended.
1.53 + *
1.54 + * <p> <b>WARNING:</b> The {@code ElementVisitor} interface
1.55 + * implemented by this class may have methods added to it or the
1.56 + * {@code ElementKind} {@code enum} used in this case may have
1.57 + * constants added to it in the future to accommodate new, currently
1.58 + * unknown, language structures added to future versions of the
1.59 + * Java™ programming language. Therefore, methods whose names
1.60 + * begin with {@code "visit"} may be added to this class in the
1.61 + * future; to avoid incompatibilities, classes which extend this class
1.62 + * should not declare any instance methods with names beginning with
1.63 + * {@code "visit"}.
1.64 + *
1.65 + * <p>When such a new visit method is added, the default
1.66 + * implementation in this class will be to call the {@link
1.67 + * #visitUnknown visitUnknown} method. A new abstract element kind
1.68 + * visitor class will also be introduced to correspond to the new
1.69 + * language level; this visitor will have different default behavior
1.70 + * for the visit method in question. When the new visitor is
1.71 + * introduced, all or portions of this visitor may be deprecated.
1.72 + *
1.73 + * <p>Note that adding a default implementation of a new visit method
1.74 + * in a visitor class will occur instead of adding a <em>default
1.75 + * method</em> directly in the visitor interface since a Java SE 8
1.76 + * language feature cannot be used to this version of the API since
1.77 + * this version is required to be runnable on Java SE 7
1.78 + * implementations. Future versions of the API that are only required
1.79 + * to run on Java SE 8 and later may take advantage of default methods
1.80 + * in this situation.
1.81 + *
1.82 + * @param <R> the return type of this visitor's methods. Use {@link
1.83 + * Void} for visitors that do not need to return results.
1.84 + * @param <P> the type of the additional parameter to this visitor's
1.85 + * methods. Use {@code Void} for visitors that do not need an
1.86 + * additional parameter.
1.87 + *
1.88 + * @author Joseph D. Darcy
1.89 + * @author Scott Seligman
1.90 + * @author Peter von der Ahé
1.91 + *
1.92 + * @see ElementKindVisitor7
1.93 + * @see ElementKindVisitor8
1.94 + * @since 1.6
1.95 + */
1.96 +@SupportedSourceVersion(RELEASE_6)
1.97 +public class ElementKindVisitor6<R, P>
1.98 + extends SimpleElementVisitor6<R, P> {
1.99 + /**
1.100 + * Constructor for concrete subclasses; uses {@code null} for the
1.101 + * default value.
1.102 + */
1.103 + protected ElementKindVisitor6() {
1.104 + super(null);
1.105 + }
1.106 +
1.107 + /**
1.108 + * Constructor for concrete subclasses; uses the argument for the
1.109 + * default value.
1.110 + *
1.111 + * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
1.112 + */
1.113 + protected ElementKindVisitor6(R defaultValue) {
1.114 + super(defaultValue);
1.115 + }
1.116 +
1.117 + /**
1.118 + * {@inheritDoc}
1.119 + *
1.120 + * The element argument has kind {@code PACKAGE}.
1.121 + *
1.122 + * @param e {@inheritDoc}
1.123 + * @param p {@inheritDoc}
1.124 + * @return {@inheritDoc}
1.125 + */
1.126 + @Override
1.127 + public R visitPackage(PackageElement e, P p) {
1.128 + assert e.getKind() == PACKAGE: "Bad kind on PackageElement";
1.129 + return defaultAction(e, p);
1.130 + }
1.131 +
1.132 + /**
1.133 + * Visits a type element, dispatching to the visit method for the
1.134 + * specific {@linkplain ElementKind kind} of type, {@code
1.135 + * ANNOTATION_TYPE}, {@code CLASS}, {@code ENUM}, or {@code
1.136 + * INTERFACE}.
1.137 + *
1.138 + * @param e {@inheritDoc}
1.139 + * @param p {@inheritDoc}
1.140 + * @return the result of the kind-specific visit method
1.141 + */
1.142 + @Override
1.143 + public R visitType(TypeElement e, P p) {
1.144 + ElementKind k = e.getKind();
1.145 + switch(k) {
1.146 + case ANNOTATION_TYPE:
1.147 + return visitTypeAsAnnotationType(e, p);
1.148 +
1.149 + case CLASS:
1.150 + return visitTypeAsClass(e, p);
1.151 +
1.152 + case ENUM:
1.153 + return visitTypeAsEnum(e, p);
1.154 +
1.155 + case INTERFACE:
1.156 + return visitTypeAsInterface(e, p);
1.157 +
1.158 + default:
1.159 + throw new AssertionError("Bad kind " + k + " for TypeElement" + e);
1.160 + }
1.161 + }
1.162 +
1.163 + /**
1.164 + * Visits an {@code ANNOTATION_TYPE} type element by calling
1.165 + * {@code defaultAction}.
1.166 + *
1.167 + * @param e the element to visit
1.168 + * @param p a visitor-specified parameter
1.169 + * @return the result of {@code defaultAction}
1.170 + */
1.171 + public R visitTypeAsAnnotationType(TypeElement e, P p) {
1.172 + return defaultAction(e, p);
1.173 + }
1.174 +
1.175 + /**
1.176 + * Visits a {@code CLASS} type element by calling {@code
1.177 + * defaultAction}.
1.178 + *
1.179 + * @param e the element to visit
1.180 + * @param p a visitor-specified parameter
1.181 + * @return the result of {@code defaultAction}
1.182 + */
1.183 + public R visitTypeAsClass(TypeElement e, P p) {
1.184 + return defaultAction(e, p);
1.185 + }
1.186 +
1.187 + /**
1.188 + * Visits an {@code ENUM} type element by calling {@code
1.189 + * defaultAction}.
1.190 + *
1.191 + * @param e the element to visit
1.192 + * @param p a visitor-specified parameter
1.193 + * @return the result of {@code defaultAction}
1.194 + */
1.195 + public R visitTypeAsEnum(TypeElement e, P p) {
1.196 + return defaultAction(e, p);
1.197 + }
1.198 +
1.199 + /**
1.200 + * Visits an {@code INTERFACE} type element by calling {@code
1.201 + * defaultAction}.
1.202 + *.
1.203 + * @param e the element to visit
1.204 + * @param p a visitor-specified parameter
1.205 + * @return the result of {@code defaultAction}
1.206 + */
1.207 + public R visitTypeAsInterface(TypeElement e, P p) {
1.208 + return defaultAction(e, p);
1.209 + }
1.210 +
1.211 + /**
1.212 + * Visits a variable element, dispatching to the visit method for
1.213 + * the specific {@linkplain ElementKind kind} of variable, {@code
1.214 + * ENUM_CONSTANT}, {@code EXCEPTION_PARAMETER}, {@code FIELD},
1.215 + * {@code LOCAL_VARIABLE}, {@code PARAMETER}, or {@code RESOURCE_VARIABLE}.
1.216 + *
1.217 + * @param e {@inheritDoc}
1.218 + * @param p {@inheritDoc}
1.219 + * @return the result of the kind-specific visit method
1.220 + */
1.221 + @Override
1.222 + public R visitVariable(VariableElement e, P p) {
1.223 + ElementKind k = e.getKind();
1.224 + switch(k) {
1.225 + case ENUM_CONSTANT:
1.226 + return visitVariableAsEnumConstant(e, p);
1.227 +
1.228 + case EXCEPTION_PARAMETER:
1.229 + return visitVariableAsExceptionParameter(e, p);
1.230 +
1.231 + case FIELD:
1.232 + return visitVariableAsField(e, p);
1.233 +
1.234 + case LOCAL_VARIABLE:
1.235 + return visitVariableAsLocalVariable(e, p);
1.236 +
1.237 + case PARAMETER:
1.238 + return visitVariableAsParameter(e, p);
1.239 +
1.240 + case RESOURCE_VARIABLE:
1.241 + return visitVariableAsResourceVariable(e, p);
1.242 +
1.243 + default:
1.244 + throw new AssertionError("Bad kind " + k + " for VariableElement" + e);
1.245 + }
1.246 + }
1.247 +
1.248 + /**
1.249 + * Visits an {@code ENUM_CONSTANT} variable element by calling
1.250 + * {@code defaultAction}.
1.251 + *
1.252 + * @param e the element to visit
1.253 + * @param p a visitor-specified parameter
1.254 + * @return the result of {@code defaultAction}
1.255 + */
1.256 + public R visitVariableAsEnumConstant(VariableElement e, P p) {
1.257 + return defaultAction(e, p);
1.258 + }
1.259 +
1.260 + /**
1.261 + * Visits an {@code EXCEPTION_PARAMETER} variable element by calling
1.262 + * {@code defaultAction}.
1.263 + *
1.264 + * @param e the element to visit
1.265 + * @param p a visitor-specified parameter
1.266 + * @return the result of {@code defaultAction}
1.267 + */
1.268 + public R visitVariableAsExceptionParameter(VariableElement e, P p) {
1.269 + return defaultAction(e, p);
1.270 + }
1.271 +
1.272 + /**
1.273 + * Visits a {@code FIELD} variable element by calling
1.274 + * {@code defaultAction}.
1.275 + *
1.276 + * @param e the element to visit
1.277 + * @param p a visitor-specified parameter
1.278 + * @return the result of {@code defaultAction}
1.279 + */
1.280 + public R visitVariableAsField(VariableElement e, P p) {
1.281 + return defaultAction(e, p);
1.282 + }
1.283 +
1.284 + /**
1.285 + * Visits a {@code LOCAL_VARIABLE} variable element by calling
1.286 + * {@code defaultAction}.
1.287 + *
1.288 + * @param e the element to visit
1.289 + * @param p a visitor-specified parameter
1.290 + * @return the result of {@code defaultAction}
1.291 + */
1.292 + public R visitVariableAsLocalVariable(VariableElement e, P p) {
1.293 + return defaultAction(e, p);
1.294 + }
1.295 +
1.296 + /**
1.297 + * Visits a {@code PARAMETER} variable element by calling
1.298 + * {@code defaultAction}.
1.299 + *
1.300 + * @param e the element to visit
1.301 + * @param p a visitor-specified parameter
1.302 + * @return the result of {@code defaultAction}
1.303 + */
1.304 + public R visitVariableAsParameter(VariableElement e, P p) {
1.305 + return defaultAction(e, p);
1.306 + }
1.307 +
1.308 + /**
1.309 + * Visits a {@code RESOURCE_VARIABLE} variable element by calling
1.310 + * {@code visitUnknown}.
1.311 + *
1.312 + * @param e the element to visit
1.313 + * @param p a visitor-specified parameter
1.314 + * @return the result of {@code visitUnknown}
1.315 + *
1.316 + * @since 1.7
1.317 + */
1.318 + public R visitVariableAsResourceVariable(VariableElement e, P p) {
1.319 + return visitUnknown(e, p);
1.320 + }
1.321 +
1.322 + /**
1.323 + * Visits an executable element, dispatching to the visit method
1.324 + * for the specific {@linkplain ElementKind kind} of executable,
1.325 + * {@code CONSTRUCTOR}, {@code INSTANCE_INIT}, {@code METHOD}, or
1.326 + * {@code STATIC_INIT}.
1.327 + *
1.328 + * @param e {@inheritDoc}
1.329 + * @param p {@inheritDoc}
1.330 + * @return the result of the kind-specific visit method
1.331 + */
1.332 + @Override
1.333 + public R visitExecutable(ExecutableElement e, P p) {
1.334 + ElementKind k = e.getKind();
1.335 + switch(k) {
1.336 + case CONSTRUCTOR:
1.337 + return visitExecutableAsConstructor(e, p);
1.338 +
1.339 + case INSTANCE_INIT:
1.340 + return visitExecutableAsInstanceInit(e, p);
1.341 +
1.342 + case METHOD:
1.343 + return visitExecutableAsMethod(e, p);
1.344 +
1.345 + case STATIC_INIT:
1.346 + return visitExecutableAsStaticInit(e, p);
1.347 +
1.348 + default:
1.349 + throw new AssertionError("Bad kind " + k + " for ExecutableElement" + e);
1.350 + }
1.351 + }
1.352 +
1.353 + /**
1.354 + * Visits a {@code CONSTRUCTOR} executable element by calling
1.355 + * {@code defaultAction}.
1.356 + *
1.357 + * @param e the element to visit
1.358 + * @param p a visitor-specified parameter
1.359 + * @return the result of {@code defaultAction}
1.360 + */
1.361 + public R visitExecutableAsConstructor(ExecutableElement e, P p) {
1.362 + return defaultAction(e, p);
1.363 + }
1.364 +
1.365 + /**
1.366 + * Visits an {@code INSTANCE_INIT} executable element by calling
1.367 + * {@code defaultAction}.
1.368 + *
1.369 + * @param e the element to visit
1.370 + * @param p a visitor-specified parameter
1.371 + * @return the result of {@code defaultAction}
1.372 + */
1.373 + public R visitExecutableAsInstanceInit(ExecutableElement e, P p) {
1.374 + return defaultAction(e, p);
1.375 + }
1.376 +
1.377 + /**
1.378 + * Visits a {@code METHOD} executable element by calling
1.379 + * {@code defaultAction}.
1.380 + *
1.381 + * @param e the element to visit
1.382 + * @param p a visitor-specified parameter
1.383 + * @return the result of {@code defaultAction}
1.384 + */
1.385 + public R visitExecutableAsMethod(ExecutableElement e, P p) {
1.386 + return defaultAction(e, p);
1.387 + }
1.388 +
1.389 + /**
1.390 + * Visits a {@code STATIC_INIT} executable element by calling
1.391 + * {@code defaultAction}.
1.392 + *
1.393 + * @param e the element to visit
1.394 + * @param p a visitor-specified parameter
1.395 + * @return the result of {@code defaultAction}
1.396 + */
1.397 + public R visitExecutableAsStaticInit(ExecutableElement e, P p) {
1.398 + return defaultAction(e, p);
1.399 + }
1.400 +
1.401 +
1.402 + /**
1.403 + * {@inheritDoc}
1.404 + *
1.405 + * The element argument has kind {@code TYPE_PARAMETER}.
1.406 + *
1.407 + * @param e {@inheritDoc}
1.408 + * @param p {@inheritDoc}
1.409 + * @return {@inheritDoc}
1.410 + */
1.411 + @Override
1.412 + public R visitTypeParameter(TypeParameterElement e, P p) {
1.413 + assert e.getKind() == TYPE_PARAMETER: "Bad kind on TypeParameterElement";
1.414 + return defaultAction(e, p);
1.415 + }
1.416 +}
