Sat, 01 Dec 2007 00:00:00 +0000
Initial load
duke@1 | 1 | /* |
duke@1 | 2 | * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@1 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@1 | 4 | * |
duke@1 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@1 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@1 | 7 | * published by the Free Software Foundation. Sun designates this |
duke@1 | 8 | * particular file as subject to the "Classpath" exception as provided |
duke@1 | 9 | * by Sun in the LICENSE file that accompanied this code. |
duke@1 | 10 | * |
duke@1 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@1 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@1 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@1 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@1 | 15 | * accompanied this code). |
duke@1 | 16 | * |
duke@1 | 17 | * You should have received a copy of the GNU General Public License version |
duke@1 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@1 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@1 | 20 | * |
duke@1 | 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@1 | 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@1 | 23 | * have any questions. |
duke@1 | 24 | */ |
duke@1 | 25 | |
duke@1 | 26 | package javax.annotation.processing; |
duke@1 | 27 | |
duke@1 | 28 | import java.util.Set; |
duke@1 | 29 | import java.util.HashSet; |
duke@1 | 30 | import java.util.Collections; |
duke@1 | 31 | import javax.lang.model.element.*; |
duke@1 | 32 | import javax.lang.model.SourceVersion; |
duke@1 | 33 | import javax.tools.Diagnostic; |
duke@1 | 34 | |
duke@1 | 35 | /** |
duke@1 | 36 | * An abstract annotation processor designed to be a convenient |
duke@1 | 37 | * superclass for most concrete annotation processors. This class |
duke@1 | 38 | * examines annotation values to compute the {@linkplain |
duke@1 | 39 | * #getSupportedOptions options}, {@linkplain |
duke@1 | 40 | * #getSupportedAnnotationTypes annotations}, and {@linkplain |
duke@1 | 41 | * #getSupportedSourceVersion source version} supported by its |
duke@1 | 42 | * subtypes. |
duke@1 | 43 | * |
duke@1 | 44 | * <p>The getter methods may {@linkplain Messager#printMessage issue |
duke@1 | 45 | * warnings} about noteworthy conditions using the facilities available |
duke@1 | 46 | * after the processor has been {@linkplain #isInitialized |
duke@1 | 47 | * initialized}. |
duke@1 | 48 | * |
duke@1 | 49 | * <p>Subclasses are free to override the implementation and |
duke@1 | 50 | * specification of any of the methods in this class as long as the |
duke@1 | 51 | * general {@link javax.annotation.processing.Processor Processor} |
duke@1 | 52 | * contract for that method is obeyed. |
duke@1 | 53 | * |
duke@1 | 54 | * @author Joseph D. Darcy |
duke@1 | 55 | * @author Scott Seligman |
duke@1 | 56 | * @author Peter von der Ahé |
duke@1 | 57 | * @since 1.6 |
duke@1 | 58 | */ |
duke@1 | 59 | public abstract class AbstractProcessor implements Processor { |
duke@1 | 60 | /** |
duke@1 | 61 | * Processing environment providing by the tool framework. |
duke@1 | 62 | */ |
duke@1 | 63 | protected ProcessingEnvironment processingEnv; |
duke@1 | 64 | private boolean initialized = false; |
duke@1 | 65 | |
duke@1 | 66 | /** |
duke@1 | 67 | * Constructor for subclasses to call. |
duke@1 | 68 | */ |
duke@1 | 69 | protected AbstractProcessor() {} |
duke@1 | 70 | |
duke@1 | 71 | /** |
duke@1 | 72 | * If the processor class is annotated with {@link |
duke@1 | 73 | * SupportedOptions}, return an unmodifiable set with the same set |
duke@1 | 74 | * of strings as the annotation. If the class is not so |
duke@1 | 75 | * annotated, an empty set is returned. |
duke@1 | 76 | * |
duke@1 | 77 | * @return the options recognized by this processor, or an empty |
duke@1 | 78 | * set if none |
duke@1 | 79 | */ |
duke@1 | 80 | public Set<String> getSupportedOptions() { |
duke@1 | 81 | SupportedOptions so = this.getClass().getAnnotation(SupportedOptions.class); |
duke@1 | 82 | if (so == null) |
duke@1 | 83 | return Collections.emptySet(); |
duke@1 | 84 | else |
duke@1 | 85 | return arrayToSet(so.value()); |
duke@1 | 86 | } |
duke@1 | 87 | |
duke@1 | 88 | /** |
duke@1 | 89 | * If the processor class is annotated with {@link |
duke@1 | 90 | * SupportedAnnotationTypes}, return an unmodifiable set with the |
duke@1 | 91 | * same set of strings as the annotation. If the class is not so |
duke@1 | 92 | * annotated, an empty set is returned. |
duke@1 | 93 | * |
duke@1 | 94 | * @return the names of the annotation types supported by this |
duke@1 | 95 | * processor, or an empty set if none |
duke@1 | 96 | */ |
duke@1 | 97 | public Set<String> getSupportedAnnotationTypes() { |
duke@1 | 98 | SupportedAnnotationTypes sat = this.getClass().getAnnotation(SupportedAnnotationTypes.class); |
duke@1 | 99 | if (sat == null) { |
duke@1 | 100 | if (isInitialized()) |
duke@1 | 101 | processingEnv.getMessager().printMessage(Diagnostic.Kind.WARNING, |
duke@1 | 102 | "No SupportedAnnotationTypes annotation " + |
duke@1 | 103 | "found on " + this.getClass().getName() + |
duke@1 | 104 | ", returning an empty set."); |
duke@1 | 105 | return Collections.emptySet(); |
duke@1 | 106 | } |
duke@1 | 107 | else |
duke@1 | 108 | return arrayToSet(sat.value()); |
duke@1 | 109 | } |
duke@1 | 110 | |
duke@1 | 111 | /** |
duke@1 | 112 | * If the processor class is annotated with {@link |
duke@1 | 113 | * SupportedSourceVersion}, return the source version in the |
duke@1 | 114 | * annotation. If the class is not so annotated, {@link |
duke@1 | 115 | * SourceVersion#RELEASE_6} is returned. |
duke@1 | 116 | * |
duke@1 | 117 | * @return the latest source version supported by this processor |
duke@1 | 118 | */ |
duke@1 | 119 | public SourceVersion getSupportedSourceVersion() { |
duke@1 | 120 | SupportedSourceVersion ssv = this.getClass().getAnnotation(SupportedSourceVersion.class); |
duke@1 | 121 | SourceVersion sv = null; |
duke@1 | 122 | if (ssv == null) { |
duke@1 | 123 | sv = SourceVersion.RELEASE_6; |
duke@1 | 124 | if (isInitialized()) |
duke@1 | 125 | processingEnv.getMessager().printMessage(Diagnostic.Kind.WARNING, |
duke@1 | 126 | "No SupportedSourceVersion annotation " + |
duke@1 | 127 | "found on " + this.getClass().getName() + |
duke@1 | 128 | ", returning " + sv + "."); |
duke@1 | 129 | } else |
duke@1 | 130 | sv = ssv.value(); |
duke@1 | 131 | return sv; |
duke@1 | 132 | } |
duke@1 | 133 | |
duke@1 | 134 | |
duke@1 | 135 | /** |
duke@1 | 136 | * Initializes the processor with the processing environment by |
duke@1 | 137 | * setting the {@code processingEnv} field to the value of the |
duke@1 | 138 | * {@code processingEnv} argument. An {@code |
duke@1 | 139 | * IllegalStateException} will be thrown if this method is called |
duke@1 | 140 | * more than once on the same object. |
duke@1 | 141 | * |
duke@1 | 142 | * @param processingEnv environment to access facilities the tool framework |
duke@1 | 143 | * provides to the processor |
duke@1 | 144 | * @throws IllegalStateException if this method is called more than once. |
duke@1 | 145 | */ |
duke@1 | 146 | public synchronized void init(ProcessingEnvironment processingEnv) { |
duke@1 | 147 | if (initialized) |
duke@1 | 148 | throw new IllegalStateException("Cannot call init more than once."); |
duke@1 | 149 | if (processingEnv == null) |
duke@1 | 150 | throw new NullPointerException("Tool provided null ProcessingEnvironment"); |
duke@1 | 151 | |
duke@1 | 152 | this.processingEnv = processingEnv; |
duke@1 | 153 | initialized = true; |
duke@1 | 154 | } |
duke@1 | 155 | |
duke@1 | 156 | /** |
duke@1 | 157 | * {@inheritDoc} |
duke@1 | 158 | */ |
duke@1 | 159 | public abstract boolean process(Set<? extends TypeElement> annotations, |
duke@1 | 160 | RoundEnvironment roundEnv); |
duke@1 | 161 | |
duke@1 | 162 | /** |
duke@1 | 163 | * Returns an empty iterable of completions. |
duke@1 | 164 | * |
duke@1 | 165 | * @param element {@inheritDoc} |
duke@1 | 166 | * @param annotation {@inheritDoc} |
duke@1 | 167 | * @param member {@inheritDoc} |
duke@1 | 168 | * @param userText {@inheritDoc} |
duke@1 | 169 | */ |
duke@1 | 170 | public Iterable<? extends Completion> getCompletions(Element element, |
duke@1 | 171 | AnnotationMirror annotation, |
duke@1 | 172 | ExecutableElement member, |
duke@1 | 173 | String userText) { |
duke@1 | 174 | return Collections.emptyList(); |
duke@1 | 175 | } |
duke@1 | 176 | |
duke@1 | 177 | /** |
duke@1 | 178 | * Returns {@code true} if this object has been {@linkplain #init |
duke@1 | 179 | * initialized}, {@code false} otherwise. |
duke@1 | 180 | * |
duke@1 | 181 | * @return {@code true} if this object has been initialized, |
duke@1 | 182 | * {@code false} otherwise. |
duke@1 | 183 | */ |
duke@1 | 184 | protected synchronized boolean isInitialized() { |
duke@1 | 185 | return initialized; |
duke@1 | 186 | } |
duke@1 | 187 | |
duke@1 | 188 | private static Set<String> arrayToSet(String[] array) { |
duke@1 | 189 | assert array != null; |
duke@1 | 190 | Set<String> set = new HashSet<String>(array.length); |
duke@1 | 191 | for (String s : array) |
duke@1 | 192 | set.add(s); |
duke@1 | 193 | return Collections.unmodifiableSet(set); |
duke@1 | 194 | } |
duke@1 | 195 | } |