J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.reflect.annotation; |
| 27 | |
| 28 | import java.lang.annotation.*; |
| 29 | import java.lang.reflect.*; |
| 30 | import java.io.Serializable; |
| 31 | import java.util.*; |
| 32 | import java.lang.annotation.*; |
| 33 | import java.security.AccessController; |
| 34 | import java.security.PrivilegedAction; |
| 35 | |
| 36 | /** |
| 37 | * InvocationHandler for dynamic proxy implementation of Annotation. |
| 38 | * |
| 39 | * @author Josh Bloch |
| 40 | * @since 1.5 |
| 41 | */ |
| 42 | class AnnotationInvocationHandler implements InvocationHandler, Serializable { |
| 43 | private final Class type; |
| 44 | private final Map<String, Object> memberValues; |
| 45 | |
| 46 | AnnotationInvocationHandler(Class type, Map<String, Object> memberValues) { |
| 47 | this.type = type; |
| 48 | this.memberValues = memberValues; |
| 49 | } |
| 50 | |
| 51 | public Object invoke(Object proxy, Method method, Object[] args) { |
| 52 | String member = method.getName(); |
| 53 | Class[] paramTypes = method.getParameterTypes(); |
| 54 | |
| 55 | // Handle Object and Annotation methods |
| 56 | if (member.equals("equals") && paramTypes.length == 1 && |
| 57 | paramTypes[0] == Object.class) |
| 58 | return equalsImpl(args[0]); |
| 59 | assert paramTypes.length == 0; |
| 60 | if (member.equals("toString")) |
| 61 | return toStringImpl(); |
| 62 | if (member.equals("hashCode")) |
| 63 | return hashCodeImpl(); |
| 64 | if (member.equals("annotationType")) |
| 65 | return type; |
| 66 | |
| 67 | // Handle annotation member accessors |
| 68 | Object result = memberValues.get(member); |
| 69 | |
| 70 | if (result == null) |
| 71 | throw new IncompleteAnnotationException(type, member); |
| 72 | |
| 73 | if (result instanceof ExceptionProxy) |
| 74 | throw ((ExceptionProxy) result).generateException(); |
| 75 | |
| 76 | if (result.getClass().isArray() && Array.getLength(result) != 0) |
| 77 | result = cloneArray(result); |
| 78 | |
| 79 | return result; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * This method, which clones its array argument, would not be necessary |
| 84 | * if Cloneable had a public clone method. |
| 85 | */ |
| 86 | private Object cloneArray(Object array) { |
| 87 | Class type = array.getClass(); |
| 88 | |
| 89 | if (type == byte[].class) { |
| 90 | byte[] byteArray = (byte[])array; |
| 91 | return byteArray.clone(); |
| 92 | } |
| 93 | if (type == char[].class) { |
| 94 | char[] charArray = (char[])array; |
| 95 | return charArray.clone(); |
| 96 | } |
| 97 | if (type == double[].class) { |
| 98 | double[] doubleArray = (double[])array; |
| 99 | return doubleArray.clone(); |
| 100 | } |
| 101 | if (type == float[].class) { |
| 102 | float[] floatArray = (float[])array; |
| 103 | return floatArray.clone(); |
| 104 | } |
| 105 | if (type == int[].class) { |
| 106 | int[] intArray = (int[])array; |
| 107 | return intArray.clone(); |
| 108 | } |
| 109 | if (type == long[].class) { |
| 110 | long[] longArray = (long[])array; |
| 111 | return longArray.clone(); |
| 112 | } |
| 113 | if (type == short[].class) { |
| 114 | short[] shortArray = (short[])array; |
| 115 | return shortArray.clone(); |
| 116 | } |
| 117 | if (type == boolean[].class) { |
| 118 | boolean[] booleanArray = (boolean[])array; |
| 119 | return booleanArray.clone(); |
| 120 | } |
| 121 | |
| 122 | Object[] objectArray = (Object[])array; |
| 123 | return objectArray.clone(); |
| 124 | } |
| 125 | |
| 126 | |
| 127 | /** |
| 128 | * Implementation of dynamicProxy.toString() |
| 129 | */ |
| 130 | private String toStringImpl() { |
| 131 | StringBuffer result = new StringBuffer(128); |
| 132 | result.append('@'); |
| 133 | result.append(type.getName()); |
| 134 | result.append('('); |
| 135 | boolean firstMember = true; |
| 136 | for (Map.Entry<String, Object> e : memberValues.entrySet()) { |
| 137 | if (firstMember) |
| 138 | firstMember = false; |
| 139 | else |
| 140 | result.append(", "); |
| 141 | |
| 142 | result.append(e.getKey()); |
| 143 | result.append('='); |
| 144 | result.append(memberValueToString(e.getValue())); |
| 145 | } |
| 146 | result.append(')'); |
| 147 | return result.toString(); |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Translates a member value (in "dynamic proxy return form") into a string |
| 152 | */ |
| 153 | private static String memberValueToString(Object value) { |
| 154 | Class type = value.getClass(); |
| 155 | if (!type.isArray()) // primitive, string, class, enum const, |
| 156 | // or annotation |
| 157 | return value.toString(); |
| 158 | |
| 159 | if (type == byte[].class) |
| 160 | return Arrays.toString((byte[]) value); |
| 161 | if (type == char[].class) |
| 162 | return Arrays.toString((char[]) value); |
| 163 | if (type == double[].class) |
| 164 | return Arrays.toString((double[]) value); |
| 165 | if (type == float[].class) |
| 166 | return Arrays.toString((float[]) value); |
| 167 | if (type == int[].class) |
| 168 | return Arrays.toString((int[]) value); |
| 169 | if (type == long[].class) |
| 170 | return Arrays.toString((long[]) value); |
| 171 | if (type == short[].class) |
| 172 | return Arrays.toString((short[]) value); |
| 173 | if (type == boolean[].class) |
| 174 | return Arrays.toString((boolean[]) value); |
| 175 | return Arrays.toString((Object[]) value); |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Implementation of dynamicProxy.equals(Object o) |
| 180 | */ |
| 181 | private Boolean equalsImpl(Object o) { |
| 182 | if (o == this) |
| 183 | return true; |
| 184 | |
| 185 | if (!type.isInstance(o)) |
| 186 | return false; |
| 187 | for (Method memberMethod : getMemberMethods()) { |
| 188 | String member = memberMethod.getName(); |
| 189 | Object ourValue = memberValues.get(member); |
| 190 | Object hisValue = null; |
| 191 | AnnotationInvocationHandler hisHandler = asOneOfUs(o); |
| 192 | if (hisHandler != null) { |
| 193 | hisValue = hisHandler.memberValues.get(member); |
| 194 | } else { |
| 195 | try { |
| 196 | hisValue = memberMethod.invoke(o); |
| 197 | } catch (InvocationTargetException e) { |
| 198 | return false; |
| 199 | } catch (IllegalAccessException e) { |
| 200 | throw new AssertionError(e); |
| 201 | } |
| 202 | } |
| 203 | if (!memberValueEquals(ourValue, hisValue)) |
| 204 | return false; |
| 205 | } |
| 206 | return true; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Returns an object's invocation handler if that object is a dynamic |
| 211 | * proxy with a handler of type AnnotationInvocationHandler. |
| 212 | * Returns null otherwise. |
| 213 | */ |
| 214 | private AnnotationInvocationHandler asOneOfUs(Object o) { |
| 215 | if (Proxy.isProxyClass(o.getClass())) { |
| 216 | InvocationHandler handler = Proxy.getInvocationHandler(o); |
| 217 | if (handler instanceof AnnotationInvocationHandler) |
| 218 | return (AnnotationInvocationHandler) handler; |
| 219 | } |
| 220 | return null; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Returns true iff the two member values in "dynamic proxy return form" |
| 225 | * are equal using the appropriate equality function depending on the |
| 226 | * member type. The two values will be of the same type unless one of |
| 227 | * the containing annotations is ill-formed. If one of the containing |
| 228 | * annotations is ill-formed, this method will return false unless the |
| 229 | * two members are identical object references. |
| 230 | */ |
| 231 | private static boolean memberValueEquals(Object v1, Object v2) { |
| 232 | Class type = v1.getClass(); |
| 233 | |
| 234 | // Check for primitive, string, class, enum const, annotation, |
| 235 | // or ExceptionProxy |
| 236 | if (!type.isArray()) |
| 237 | return v1.equals(v2); |
| 238 | |
| 239 | // Check for array of string, class, enum const, annotation, |
| 240 | // or ExceptionProxy |
| 241 | if (v1 instanceof Object[] && v2 instanceof Object[]) |
| 242 | return Arrays.equals((Object[]) v1, (Object[]) v2); |
| 243 | |
| 244 | // Check for ill formed annotation(s) |
| 245 | if (v2.getClass() != type) |
| 246 | return false; |
| 247 | |
| 248 | // Deal with array of primitives |
| 249 | if (type == byte[].class) |
| 250 | return Arrays.equals((byte[]) v1, (byte[]) v2); |
| 251 | if (type == char[].class) |
| 252 | return Arrays.equals((char[]) v1, (char[]) v2); |
| 253 | if (type == double[].class) |
| 254 | return Arrays.equals((double[]) v1, (double[]) v2); |
| 255 | if (type == float[].class) |
| 256 | return Arrays.equals((float[]) v1, (float[]) v2); |
| 257 | if (type == int[].class) |
| 258 | return Arrays.equals((int[]) v1, (int[]) v2); |
| 259 | if (type == long[].class) |
| 260 | return Arrays.equals((long[]) v1, (long[]) v2); |
| 261 | if (type == short[].class) |
| 262 | return Arrays.equals((short[]) v1, (short[]) v2); |
| 263 | assert type == boolean[].class; |
| 264 | return Arrays.equals((boolean[]) v1, (boolean[]) v2); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Returns the member methods for our annotation type. These are |
| 269 | * obtained lazily and cached, as they're expensive to obtain |
| 270 | * and we only need them if our equals method is invoked (which should |
| 271 | * be rare). |
| 272 | */ |
| 273 | private Method[] getMemberMethods() { |
| 274 | if (memberMethods == null) { |
| 275 | final Method[] mm = type.getDeclaredMethods(); |
| 276 | AccessController.doPrivileged(new PrivilegedAction() { |
| 277 | public Object run() { |
| 278 | AccessibleObject.setAccessible(mm, true); |
| 279 | return null; |
| 280 | } |
| 281 | }); |
| 282 | memberMethods = mm; |
| 283 | } |
| 284 | return memberMethods; |
| 285 | } |
| 286 | private transient volatile Method[] memberMethods = null; |
| 287 | |
| 288 | /** |
| 289 | * Implementation of dynamicProxy.hashCode() |
| 290 | */ |
| 291 | private int hashCodeImpl() { |
| 292 | int result = 0; |
| 293 | for (Map.Entry<String, Object> e : memberValues.entrySet()) { |
| 294 | result += (127 * e.getKey().hashCode()) ^ |
| 295 | memberValueHashCode(e.getValue()); |
| 296 | } |
| 297 | return result; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Computes hashCode of a member value (in "dynamic proxy return form") |
| 302 | */ |
| 303 | private static int memberValueHashCode(Object value) { |
| 304 | Class type = value.getClass(); |
| 305 | if (!type.isArray()) // primitive, string, class, enum const, |
| 306 | // or annotation |
| 307 | return value.hashCode(); |
| 308 | |
| 309 | if (type == byte[].class) |
| 310 | return Arrays.hashCode((byte[]) value); |
| 311 | if (type == char[].class) |
| 312 | return Arrays.hashCode((char[]) value); |
| 313 | if (type == double[].class) |
| 314 | return Arrays.hashCode((double[]) value); |
| 315 | if (type == float[].class) |
| 316 | return Arrays.hashCode((float[]) value); |
| 317 | if (type == int[].class) |
| 318 | return Arrays.hashCode((int[]) value); |
| 319 | if (type == long[].class) |
| 320 | return Arrays.hashCode((long[]) value); |
| 321 | if (type == short[].class) |
| 322 | return Arrays.hashCode((short[]) value); |
| 323 | if (type == boolean[].class) |
| 324 | return Arrays.hashCode((boolean[]) value); |
| 325 | return Arrays.hashCode((Object[]) value); |
| 326 | } |
| 327 | |
| 328 | private void readObject(java.io.ObjectInputStream s) |
| 329 | throws java.io.IOException, ClassNotFoundException { |
| 330 | s.defaultReadObject(); |
| 331 | |
| 332 | |
| 333 | // Check to make sure that types have not evolved incompatibly |
| 334 | |
| 335 | AnnotationType annotationType = null; |
| 336 | try { |
| 337 | annotationType = AnnotationType.getInstance(type); |
| 338 | } catch(IllegalArgumentException e) { |
| 339 | // Class is no longer an annotation type; all bets are off |
| 340 | return; |
| 341 | } |
| 342 | |
| 343 | Map<String, Class> memberTypes = annotationType.memberTypes(); |
| 344 | |
| 345 | for (Map.Entry<String, Object> memberValue : memberValues.entrySet()) { |
| 346 | String name = memberValue.getKey(); |
| 347 | Class memberType = memberTypes.get(name); |
| 348 | if (memberType != null) { // i.e. member still exists |
| 349 | Object value = memberValue.getValue(); |
| 350 | if (!(memberType.isInstance(value) || |
| 351 | value instanceof ExceptionProxy)) { |
| 352 | memberValue.setValue( |
| 353 | new AnnotationTypeMismatchExceptionProxy( |
| 354 | value.getClass() + "[" + value + "]").setMember( |
| 355 | annotationType.members().get(name))); |
| 356 | } |
| 357 | } |
| 358 | } |
| 359 | } |
| 360 | } |