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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2006, 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 sun.reflect.annotation; | |
| 27 | + | |
| 28 | +import java.lang.annotation.*; | |
| 29 | +import java.lang.reflect.*; | |
| 30 | +import java.util.*; | |
| 31 | +import java.security.AccessController; | |
| 32 | +import java.security.PrivilegedAction; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * Represents an annotation type at run time. Used to type-check annotations | |
| 36 | + * and apply member defaults. | |
| 37 | + * | |
| 38 | + * @author Josh Bloch | |
| 39 | + * @since 1.5 | |
| 40 | + */ | |
| 41 | +public class AnnotationType { | |
| 42 | + /** | |
| 43 | + * Member name -> type mapping. Note that primitive types | |
| 44 | + * are represented by the class objects for the corresponding wrapper | |
| 45 | + * types. This matches the return value that must be used for a | |
| 46 | + * dynamic proxy, allowing for a simple isInstance test. | |
| 47 | + */ | |
| 48 | + private final Map<String, Class<?>> memberTypes = new HashMap<String,Class<?>>(); | |
| 49 | + | |
| 50 | + /** | |
| 51 | + * Member name -> default value mapping. | |
| 52 | + */ | |
| 53 | + private final Map<String, Object> memberDefaults = | |
| 54 | + new HashMap<String, Object>(); | |
| 55 | + | |
| 56 | + /** | |
| 57 | + * Member name -> Method object mapping. This (and its assoicated | |
| 58 | + * accessor) are used only to generate AnnotationTypeMismatchExceptions. | |
| 59 | + */ | |
| 60 | + private final Map<String, Method> members = new HashMap<String, Method>(); | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * The retention policy for this annotation type. | |
| 64 | + */ | |
| 65 | + private RetentionPolicy retention = RetentionPolicy.RUNTIME;; | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Whether this annotation type is inherited. | |
| 69 | + */ | |
| 70 | + private boolean inherited = false; | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Returns an AnnotationType instance for the specified annotation type. | |
| 74 | + * | |
| 75 | + * @throw IllegalArgumentException if the specified class object for | |
| 76 | + * does not represent a valid annotation type | |
| 77 | + */ | |
| 78 | + public static synchronized AnnotationType getInstance( | |
| 79 | + Class<? extends Annotation> annotationClass) | |
| 80 | + { | |
| 81 | + AnnotationType result = sun.misc.SharedSecrets.getJavaLangAccess(). | |
| 82 | + getAnnotationType(annotationClass); | |
| 83 | + if (result == null) | |
| 84 | + result = new AnnotationType((Class<? extends Annotation>) annotationClass); | |
| 85 | + | |
| 86 | + return result; | |
| 87 | + } | |
| 88 | + | |
| 89 | + /** | |
| 90 | + * Sole constructor. | |
| 91 | + * | |
| 92 | + * @param annotationClass the class object for the annotation type | |
| 93 | + * @throw IllegalArgumentException if the specified class object for | |
| 94 | + * does not represent a valid annotation type | |
| 95 | + */ | |
| 96 | + private AnnotationType(final Class<? extends Annotation> annotationClass) { | |
| 97 | + if (!annotationClass.isAnnotation()) | |
| 98 | + throw new IllegalArgumentException("Not an annotation type"); | |
| 99 | + | |
| 100 | + Method[] methods = | |
| 101 | + AccessController.doPrivileged(new PrivilegedAction<Method[]>() { | |
| 102 | + public Method[] run() { | |
| 103 | + // Initialize memberTypes and defaultValues | |
| 104 | + return annotationClass.getDeclaredMethods(); | |
| 105 | + } | |
| 106 | + }); | |
| 107 | + | |
| 108 | + | |
| 109 | + for (Method method : methods) { | |
| 110 | + if (method.getParameterTypes().length != 0) | |
| 111 | + throw new IllegalArgumentException(method + " has params"); | |
| 112 | + String name = method.getName(); | |
| 113 | + Class<?> type = method.getReturnType(); | |
| 114 | + memberTypes.put(name, invocationHandlerReturnType(type)); | |
| 115 | + members.put(name, method); | |
| 116 | + | |
| 117 | + Object defaultValue = method.getDefaultValue(); | |
| 118 | + if (defaultValue != null) | |
| 119 | + memberDefaults.put(name, defaultValue); | |
| 120 | + | |
| 121 | + members.put(name, method); | |
| 122 | + } | |
| 123 | + | |
| 124 | + sun.misc.SharedSecrets.getJavaLangAccess(). | |
| 125 | + setAnnotationType(annotationClass, this); | |
| 126 | + | |
| 127 | + // Initialize retention, & inherited fields. Special treatment | |
| 128 | + // of the corresponding annotation types breaks infinite recursion. | |
| 129 | + if (annotationClass != Retention.class && | |
| 130 | + annotationClass != Inherited.class) { | |
| 131 | + Retention ret = annotationClass.getAnnotation(Retention.class); | |
| 132 | + retention = (ret == null ? RetentionPolicy.CLASS : ret.value()); | |
| 133 | + inherited = annotationClass.isAnnotationPresent(Inherited.class); | |
| 134 | + } | |
| 135 | + } | |
| 136 | + | |
| 137 | + /** | |
| 138 | + * Returns the type that must be returned by the invocation handler | |
| 139 | + * of a dynamic proxy in order to have the dynamic proxy return | |
| 140 | + * the specified type (which is assumed to be a legal member type | |
| 141 | + * for an annotation). | |
| 142 | + */ | |
| 143 | + public static Class<?> invocationHandlerReturnType(Class<?> type) { | |
| 144 | + // Translate primitives to wrappers | |
| 145 | + if (type == byte.class) | |
| 146 | + return Byte.class; | |
| 147 | + if (type == char.class) | |
| 148 | + return Character.class; | |
| 149 | + if (type == double.class) | |
| 150 | + return Double.class; | |
| 151 | + if (type == float.class) | |
| 152 | + return Float.class; | |
| 153 | + if (type == int.class) | |
| 154 | + return Integer.class; | |
| 155 | + if (type == long.class) | |
| 156 | + return Long.class; | |
| 157 | + if (type == short.class) | |
| 158 | + return Short.class; | |
| 159 | + if (type == boolean.class) | |
| 160 | + return Boolean.class; | |
| 161 | + | |
| 162 | + // Otherwise, just return declared type | |
| 163 | + return type; | |
| 164 | + } | |
| 165 | + | |
| 166 | + /** | |
| 167 | + * Returns member types for this annotation type | |
| 168 | + * (member name -> type mapping). | |
| 169 | + */ | |
| 170 | + public Map<String, Class<?>> memberTypes() { | |
| 171 | + return memberTypes; | |
| 172 | + } | |
| 173 | + | |
| 174 | + /** | |
| 175 | + * Returns members of this annotation type | |
| 176 | + * (member name -> associated Method object mapping). | |
| 177 | + */ | |
| 178 | + public Map<String, Method> members() { | |
| 179 | + return members; | |
| 180 | + } | |
| 181 | + | |
| 182 | + /** | |
| 183 | + * Returns the default values for this annotation type | |
| 184 | + * (Member name -> default value mapping). | |
| 185 | + */ | |
| 186 | + public Map<String, Object> memberDefaults() { | |
| 187 | + return memberDefaults; | |
| 188 | + } | |
| 189 | + | |
| 190 | + /** | |
| 191 | + * Returns the retention policy for this annotation type. | |
| 192 | + */ | |
| 193 | + public RetentionPolicy retention() { | |
| 194 | + return retention; | |
| 195 | + } | |
| 196 | + | |
| 197 | + /** | |
| 198 | + * Returns true if this this annotation type is inherited. | |
| 199 | + */ | |
| 200 | + public boolean isInherited() { | |
| 201 | + return inherited; | |
| 202 | + } | |
| 203 | + | |
| 204 | + /** | |
| 205 | + * For debugging. | |
| 206 | + */ | |
| 207 | + public String toString() { | |
| 208 | + StringBuffer s = new StringBuffer("Annotation Type:" + "\n"); | |
| 209 | + s.append(" Member types: " + memberTypes + "\n"); | |
| 210 | + s.append(" Member defaults: " + memberDefaults + "\n"); | |
| 211 | + s.append(" Retention policy: " + retention + "\n"); | |
| 212 | + s.append(" Inherited: " + inherited); | |
| 213 | + return s.toString(); | |
| 214 | + } | |
| 215 | +} | |