1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/classes/javax/lang/model/util/ElementKindVisitor6.java Sat Dec 01 00:00:00 2007 +0000 1.3 @@ -0,0 +1,384 @@ 1.4 +/* 1.5 + * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this 1.11 + * particular file as subject to the "Classpath" exception as provided 1.12 + * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 1.25 + * CA 95054 USA or visit www.sun.com if you need additional information or 1.26 + * have any 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 + * @param <R> the return type of this visitor's methods. Use {@link 1.74 + * Void} for visitors that do not need to return results. 1.75 + * @param <P> the type of the additional parameter to this visitor's 1.76 + * methods. Use {@code Void} for visitors that do not need an 1.77 + * additional parameter. 1.78 + * 1.79 + * @author Joseph D. Darcy 1.80 + * @author Scott Seligman 1.81 + * @author Peter von der Ahé 1.82 + * @since 1.6 1.83 + */ 1.84 +@SupportedSourceVersion(RELEASE_6) 1.85 +public class ElementKindVisitor6<R, P> 1.86 + extends SimpleElementVisitor6<R, P> { 1.87 + /** 1.88 + * Constructor for concrete subclasses; uses {@code null} for the 1.89 + * default value. 1.90 + */ 1.91 + protected ElementKindVisitor6() { 1.92 + super(null); 1.93 + } 1.94 + 1.95 + /** 1.96 + * Constructor for concrete subclasses; uses the argument for the 1.97 + * default value. 1.98 + * 1.99 + * @param defaultValue the value to assign to {@link #DEFAULT_VALUE} 1.100 + */ 1.101 + protected ElementKindVisitor6(R defaultValue) { 1.102 + super(defaultValue); 1.103 + } 1.104 + 1.105 + /** 1.106 + * {@inheritDoc} 1.107 + * 1.108 + * The element argument has kind {@code PACKAGE}. 1.109 + * 1.110 + * @param e {@inheritDoc} 1.111 + * @param p {@inheritDoc} 1.112 + * @return {@inheritDoc} 1.113 + */ 1.114 + @Override 1.115 + public R visitPackage(PackageElement e, P p) { 1.116 + assert e.getKind() == PACKAGE: "Bad kind on PackageElement"; 1.117 + return defaultAction(e, p); 1.118 + } 1.119 + 1.120 + /** 1.121 + * Visits a type element, dispatching to the visit method for the 1.122 + * specific {@linkplain ElementKind kind} of type, {@code 1.123 + * ANNOTATION_TYPE}, {@code CLASS}, {@code ENUM}, or {@code 1.124 + * INTERFACE}. 1.125 + * 1.126 + * @param e {@inheritDoc} 1.127 + * @param p {@inheritDoc} 1.128 + * @return the result of the kind-specific visit method 1.129 + */ 1.130 + @Override 1.131 + public R visitType(TypeElement e, P p) { 1.132 + ElementKind k = e.getKind(); 1.133 + switch(k) { 1.134 + case ANNOTATION_TYPE: 1.135 + return visitTypeAsAnnotationType(e, p); 1.136 + 1.137 + case CLASS: 1.138 + return visitTypeAsClass(e, p); 1.139 + 1.140 + case ENUM: 1.141 + return visitTypeAsEnum(e, p); 1.142 + 1.143 + case INTERFACE: 1.144 + return visitTypeAsInterface(e, p); 1.145 + 1.146 + default: 1.147 + throw new AssertionError("Bad kind " + k + " for TypeElement" + e); 1.148 + } 1.149 + } 1.150 + 1.151 + /** 1.152 + * Visits an {@code ANNOTATION_TYPE} type element by calling 1.153 + * {@code defaultAction}. 1.154 + * 1.155 + * @param e the element to visit 1.156 + * @param p a visitor-specified parameter 1.157 + * @return the result of {@code defaultAction} 1.158 + */ 1.159 + public R visitTypeAsAnnotationType(TypeElement e, P p) { 1.160 + return defaultAction(e, p); 1.161 + } 1.162 + 1.163 + /** 1.164 + * Visits a {@code CLASS} type element by calling {@code 1.165 + * 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 visitTypeAsClass(TypeElement e, P p) { 1.172 + return defaultAction(e, p); 1.173 + } 1.174 + 1.175 + /** 1.176 + * Visits an {@code ENUM} 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 visitTypeAsEnum(TypeElement e, P p) { 1.184 + return defaultAction(e, p); 1.185 + } 1.186 + 1.187 + /** 1.188 + * Visits an {@code INTERFACE} 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 visitTypeAsInterface(TypeElement e, P p) { 1.196 + return defaultAction(e, p); 1.197 + } 1.198 + 1.199 + /** 1.200 + * Visits a variable element, dispatching to the visit method for 1.201 + * the specific {@linkplain ElementKind kind} of variable, {@code 1.202 + * ENUM_CONSTANT}, {@code EXCEPTION_PARAMETER}, {@code FIELD}, 1.203 + * {@code LOCAL_VARIABLE}, or {@code PARAMETER}. 1.204 + * @param e {@inheritDoc} 1.205 + * @param p {@inheritDoc} 1.206 + * @return the result of the kind-specific visit method 1.207 + */ 1.208 + @Override 1.209 + public R visitVariable(VariableElement e, P p) { 1.210 + ElementKind k = e.getKind(); 1.211 + switch(k) { 1.212 + case ENUM_CONSTANT: 1.213 + return visitVariableAsEnumConstant(e, p); 1.214 + 1.215 + case EXCEPTION_PARAMETER: 1.216 + return visitVariableAsExceptionParameter(e, p); 1.217 + 1.218 + case FIELD: 1.219 + return visitVariableAsField(e, p); 1.220 + 1.221 + case LOCAL_VARIABLE: 1.222 + return visitVariableAsLocalVariable(e, p); 1.223 + 1.224 + case PARAMETER: 1.225 + return visitVariableAsParameter(e, p); 1.226 + 1.227 + default: 1.228 + throw new AssertionError("Bad kind " + k + " for VariableElement" + e); 1.229 + } 1.230 + 1.231 + } 1.232 + 1.233 + /** 1.234 + * Visits an {@code ENUM_CONSTANT} variable element by calling 1.235 + * {@code defaultAction}. 1.236 + * 1.237 + * @param e the element to visit 1.238 + * @param p a visitor-specified parameter 1.239 + * @return the result of {@code defaultAction} 1.240 + */ 1.241 + public R visitVariableAsEnumConstant(VariableElement e, P p) { 1.242 + return defaultAction(e, p); 1.243 + } 1.244 + 1.245 + /** 1.246 + * Visits an {@code EXCEPTION_PARAMETER} variable element by calling 1.247 + * {@code defaultAction}. 1.248 + * 1.249 + * @param e the element to visit 1.250 + * @param p a visitor-specified parameter 1.251 + * @return the result of {@code defaultAction} 1.252 + */ 1.253 + public R visitVariableAsExceptionParameter(VariableElement e, P p) { 1.254 + return defaultAction(e, p); 1.255 + } 1.256 + 1.257 + /** 1.258 + * Visits a {@code FIELD} variable element by calling 1.259 + * {@code defaultAction}. 1.260 + * 1.261 + * @param e the element to visit 1.262 + * @param p a visitor-specified parameter 1.263 + * @return the result of {@code defaultAction} 1.264 + */ 1.265 + public R visitVariableAsField(VariableElement e, P p) { 1.266 + return defaultAction(e, p); 1.267 + } 1.268 + 1.269 + /** 1.270 + * Visits a {@code LOCAL_VARIABLE} variable element by calling 1.271 + * {@code defaultAction}. 1.272 + * 1.273 + * @param e the element to visit 1.274 + * @param p a visitor-specified parameter 1.275 + * @return the result of {@code defaultAction} 1.276 + */ 1.277 + public R visitVariableAsLocalVariable(VariableElement e, P p) { 1.278 + return defaultAction(e, p); 1.279 + } 1.280 + 1.281 + /** 1.282 + * Visits a {@code PARAMETER} variable element by calling 1.283 + * {@code defaultAction}. 1.284 + * 1.285 + * @param e the element to visit 1.286 + * @param p a visitor-specified parameter 1.287 + * @return the result of {@code defaultAction} 1.288 + */ 1.289 + public R visitVariableAsParameter(VariableElement e, P p) { 1.290 + return defaultAction(e, p); 1.291 + } 1.292 + 1.293 + /** 1.294 + * Visits an executable element, dispatching to the visit method 1.295 + * for the specific {@linkplain ElementKind kind} of executable, 1.296 + * {@code CONSTRUCTOR}, {@code INSTANCE_INIT}, {@code METHOD}, or 1.297 + * {@code STATIC_INIT}. 1.298 + * 1.299 + * @param e {@inheritDoc} 1.300 + * @param p {@inheritDoc} 1.301 + * @return the result of the kind-specific visit method 1.302 + */ 1.303 + @Override 1.304 + public R visitExecutable(ExecutableElement e, P p) { 1.305 + ElementKind k = e.getKind(); 1.306 + switch(k) { 1.307 + case CONSTRUCTOR: 1.308 + return visitExecutableAsConstructor(e, p); 1.309 + 1.310 + case INSTANCE_INIT: 1.311 + return visitExecutableAsInstanceInit(e, p); 1.312 + 1.313 + case METHOD: 1.314 + return visitExecutableAsMethod(e, p); 1.315 + 1.316 + case STATIC_INIT: 1.317 + return visitExecutableAsStaticInit(e, p); 1.318 + 1.319 + default: 1.320 + throw new AssertionError("Bad kind " + k + " for ExecutableElement" + e); 1.321 + } 1.322 + } 1.323 + 1.324 + /** 1.325 + * Visits a {@code CONSTRUCTOR} executable element by calling 1.326 + * {@code defaultAction}. 1.327 + * 1.328 + * @param e the element to visit 1.329 + * @param p a visitor-specified parameter 1.330 + * @return the result of {@code defaultAction} 1.331 + */ 1.332 + public R visitExecutableAsConstructor(ExecutableElement e, P p) { 1.333 + return defaultAction(e, p); 1.334 + } 1.335 + 1.336 + /** 1.337 + * Visits an {@code INSTANCE_INIT} executable element by calling 1.338 + * {@code defaultAction}. 1.339 + * 1.340 + * @param e the element to visit 1.341 + * @param p a visitor-specified parameter 1.342 + * @return the result of {@code defaultAction} 1.343 + */ 1.344 + public R visitExecutableAsInstanceInit(ExecutableElement e, P p) { 1.345 + return defaultAction(e, p); 1.346 + } 1.347 + 1.348 + /** 1.349 + * Visits a {@code METHOD} executable element by calling 1.350 + * {@code defaultAction}. 1.351 + * 1.352 + * @param e the element to visit 1.353 + * @param p a visitor-specified parameter 1.354 + * @return the result of {@code defaultAction} 1.355 + */ 1.356 + public R visitExecutableAsMethod(ExecutableElement e, P p) { 1.357 + return defaultAction(e, p); 1.358 + } 1.359 + 1.360 + /** 1.361 + * Visits a {@code STATIC_INIT} executable element by calling 1.362 + * {@code defaultAction}. 1.363 + * 1.364 + * @param e the element to visit 1.365 + * @param p a visitor-specified parameter 1.366 + * @return the result of {@code defaultAction} 1.367 + */ 1.368 + public R visitExecutableAsStaticInit(ExecutableElement e, P p) { 1.369 + return defaultAction(e, p); 1.370 + } 1.371 + 1.372 + 1.373 + /** 1.374 + * {@inheritDoc} 1.375 + * 1.376 + * The element argument has kind {@code TYPE_PARAMETER}. 1.377 + * 1.378 + * @param e {@inheritDoc} 1.379 + * @param p {@inheritDoc} 1.380 + * @return {@inheritDoc} 1.381 + */ 1.382 + @Override 1.383 + public R visitTypeParameter(TypeParameterElement e, P p) { 1.384 + assert e.getKind() == TYPE_PARAMETER: "Bad kind on TypeParameterElement"; 1.385 + return defaultAction(e, p); 1.386 + } 1.387 +}