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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 | } | ||