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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 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 java.lang.reflect; | ||
| 27 | |||
| 28 | import sun.reflect.MethodAccessor; | ||
| 29 | import sun.reflect.Reflection; | ||
| 30 | import sun.reflect.generics.repository.MethodRepository; | ||
| 31 | import sun.reflect.generics.factory.CoreReflectionFactory; | ||
| 32 | import sun.reflect.generics.factory.GenericsFactory; | ||
| 33 | import sun.reflect.generics.scope.MethodScope; | ||
| 34 | import sun.reflect.annotation.AnnotationType; | ||
| 35 | import sun.reflect.annotation.AnnotationParser; | ||
| 36 | import java.lang.annotation.Annotation; | ||
| 37 | import java.lang.annotation.AnnotationFormatError; | ||
| 38 | import java.nio.ByteBuffer; | ||
| 39 | import java.util.Map; | ||
| 40 | |||
| 41 | /** | ||
| 42 | * A {@code Method} provides information about, and access to, a single method | ||
| 43 | * on a class or interface. The reflected method may be a class method | ||
| 44 | * or an instance method (including an abstract method). | ||
| 45 | * | ||
| 46 | * <p>A {@code Method} permits widening conversions to occur when matching the | ||
| 47 | * actual parameters to invoke with the underlying method's formal | ||
| 48 | * parameters, but it throws an {@code IllegalArgumentException} if a | ||
| 49 | * narrowing conversion would occur. | ||
| 50 | * | ||
| 51 | * @see Member | ||
| 52 | * @see java.lang.Class | ||
| 53 | * @see java.lang.Class#getMethods() | ||
| 54 | * @see java.lang.Class#getMethod(String, Class[]) | ||
| 55 | * @see java.lang.Class#getDeclaredMethods() | ||
| 56 | * @see java.lang.Class#getDeclaredMethod(String, Class[]) | ||
| 57 | * | ||
| 58 | * @author Kenneth Russell | ||
| 59 | * @author Nakul Saraiya | ||
| 60 | */ | ||
| 61 | public final | ||
| 62 | class Method extends AccessibleObject implements GenericDeclaration, | ||
| 63 | Member { | ||
| 64 | private Class<?> clazz; | ||
| 65 | private int slot; | ||
| 66 | // This is guaranteed to be interned by the VM in the 1.4 | ||
| 67 | // reflection implementation | ||
| 68 | private String name; | ||
| 69 | private Class<?> returnType; | ||
| 70 | private Class<?>[] parameterTypes; | ||
| 71 | private Class<?>[] exceptionTypes; | ||
| 72 | private int modifiers; | ||
| 73 | // Generics and annotations support | ||
| 74 | private transient String signature; | ||
| 75 | // generic info repository; lazily initialized | ||
| 76 | private transient MethodRepository genericInfo; | ||
| 77 | private byte[] annotations; | ||
| 78 | private byte[] parameterAnnotations; | ||
| 79 | private byte[] annotationDefault; | ||
| 80 | private volatile MethodAccessor methodAccessor; | ||
| 81 | // For sharing of MethodAccessors. This branching structure is | ||
| 82 | // currently only two levels deep (i.e., one root Method and | ||
| 83 | // potentially many Method objects pointing to it.) | ||
| 84 | private Method root; | ||
| 85 | |||
| 86 | // Generics infrastructure | ||
| 87 | |||
| 88 | private String getGenericSignature() {return signature;} | ||
| 89 | |||
| 90 | // Accessor for factory | ||
| 91 | private GenericsFactory getFactory() { | ||
| 92 | // create scope and factory | ||
| 93 | return CoreReflectionFactory.make(this, MethodScope.make(this)); | ||
| 94 | } | ||
| 95 | |||
| 96 | // Accessor for generic info repository | ||
| 97 | private MethodRepository getGenericInfo() { | ||
| 98 | // lazily initialize repository if necessary | ||
| 99 | if (genericInfo == null) { | ||
| 100 | // create and cache generic info repository | ||
| 101 | genericInfo = MethodRepository.make(getGenericSignature(), | ||
| 102 | getFactory()); | ||
| 103 | } | ||
| 104 | return genericInfo; //return cached repository | ||
| 105 | } | ||
| 106 | |||
| 107 | /** | ||
| 108 | * Package-private constructor used by ReflectAccess to enable | ||
| 109 | * instantiation of these objects in Java code from the java.lang | ||
| 110 | * package via sun.reflect.LangReflectAccess. | ||
| 111 | */ | ||
| 112 | Method(Class<?> declaringClass, | ||
| 113 | String name, | ||
| 114 | Class<?>[] parameterTypes, | ||
| 115 | Class<?> returnType, | ||
| 116 | Class<?>[] checkedExceptions, | ||
| 117 | int modifiers, | ||
| 118 | int slot, | ||
| 119 | String signature, | ||
| 120 | byte[] annotations, | ||
| 121 | byte[] parameterAnnotations, | ||
| 122 | byte[] annotationDefault) | ||
| 123 | { | ||
| 124 | this.clazz = declaringClass; | ||
| 125 | this.name = name; | ||
| 126 | this.parameterTypes = parameterTypes; | ||
| 127 | this.returnType = returnType; | ||
| 128 | this.exceptionTypes = checkedExceptions; | ||
| 129 | this.modifiers = modifiers; | ||
| 130 | this.slot = slot; | ||
| 131 | this.signature = signature; | ||
| 132 | this.annotations = annotations; | ||
| 133 | this.parameterAnnotations = parameterAnnotations; | ||
| 134 | this.annotationDefault = annotationDefault; | ||
| 135 | } | ||
| 136 | |||
| 137 | /** | ||
| 138 | * Package-private routine (exposed to java.lang.Class via | ||
| 139 | * ReflectAccess) which returns a copy of this Method. The copy's | ||
| 140 | * "root" field points to this Method. | ||
| 141 | */ | ||
| 142 | Method copy() { | ||
| 143 | // This routine enables sharing of MethodAccessor objects | ||
| 144 | // among Method objects which refer to the same underlying | ||
| 145 | // method in the VM. (All of this contortion is only necessary | ||
| 146 | // because of the "accessibility" bit in AccessibleObject, | ||
| 147 | // which implicitly requires that new java.lang.reflect | ||
| 148 | // objects be fabricated for each reflective call on Class | ||
| 149 | // objects.) | ||
| 150 | Method res = new Method(clazz, name, parameterTypes, returnType, | ||
| 151 | exceptionTypes, modifiers, slot, signature, | ||
| 152 | annotations, parameterAnnotations, annotationDefault); | ||
| 153 | res.root = this; | ||
| 154 | // Might as well eagerly propagate this if already present | ||
| 155 | res.methodAccessor = methodAccessor; | ||
| 156 | return res; | ||
| 157 | } | ||
| 158 | |||
| 159 | /** | ||
| 160 | * Returns the {@code Class} object representing the class or interface | ||
| 161 | * that declares the method represented by this {@code Method} object. | ||
| 162 | */ | ||
| 163 | public Class<?> getDeclaringClass() { | ||
| 164 | return clazz; | ||
| 165 | } | ||
| 166 | |||
| 167 | /** | ||
| 168 | * Returns the name of the method represented by this {@code Method} | ||
| 169 | * object, as a {@code String}. | ||
| 170 | */ | ||
| 171 | public String getName() { | ||
| 172 | return name; | ||
| 173 | } | ||
| 174 | |||
| 175 | /** | ||
| 176 | * Returns the Java language modifiers for the method represented | ||
| 177 | * by this {@code Method} object, as an integer. The {@code Modifier} class should | ||
| 178 | * be used to decode the modifiers. | ||
| 179 | * | ||
| 180 | * @see Modifier | ||
| 181 | */ | ||
| 182 | public int getModifiers() { | ||
| 183 | return modifiers; | ||
| 184 | } | ||
| 185 | |||
| 186 | /** | ||
| 187 | * Returns an array of {@code TypeVariable} objects that represent the | ||
| 188 | * type variables declared by the generic declaration represented by this | ||
| 189 | * {@code GenericDeclaration} object, in declaration order. Returns an | ||
| 190 | * array of length 0 if the underlying generic declaration declares no type | ||
| 191 | * variables. | ||
| 192 | * | ||
| 193 | * @return an array of {@code TypeVariable} objects that represent | ||
| 194 | * the type variables declared by this generic declaration | ||
| 195 | * @throws GenericSignatureFormatError if the generic | ||
| 196 | * signature of this generic declaration does not conform to | ||
| 197 | * the format specified in | ||
| 198 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 199 | * @since 1.5 | ||
| 200 | */ | ||
| 201 | public TypeVariable<Method>[] getTypeParameters() { | ||
| 202 | if (getGenericSignature() != null) | ||
| 203 | return (TypeVariable<Method>[])getGenericInfo().getTypeParameters(); | ||
| 204 | else | ||
| 205 | return (TypeVariable<Method>[])new TypeVariable[0]; | ||
| 206 | } | ||
| 207 | |||
| 208 | /** | ||
| 209 | * Returns a {@code Class} object that represents the formal return type | ||
| 210 | * of the method represented by this {@code Method} object. | ||
| 211 | * | ||
| 212 | * @return the return type for the method this object represents | ||
| 213 | */ | ||
| 214 | public Class<?> getReturnType() { | ||
| 215 | return returnType; | ||
| 216 | } | ||
| 217 | |||
| 218 | /** | ||
| 219 | * Returns a {@code Type} object that represents the formal return | ||
| 220 | * type of the method represented by this {@code Method} object. | ||
| 221 | * | ||
| 222 | * <p>If the return type is a parameterized type, | ||
| 223 | * the {@code Type} object returned must accurately reflect | ||
| 224 | * the actual type parameters used in the source code. | ||
| 225 | * | ||
| 226 | * <p>If the return type is a type variable or a parameterized type, it | ||
| 227 | * is created. Otherwise, it is resolved. | ||
| 228 | * | ||
| 229 | * @return a {@code Type} object that represents the formal return | ||
| 230 | * type of the underlying method | ||
| 231 | * @throws GenericSignatureFormatError | ||
| 232 | * if the generic method signature does not conform to the format | ||
| 233 | * specified in | ||
| 234 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 235 | * @throws TypeNotPresentException if the underlying method's | ||
| 236 | * return type refers to a non-existent type declaration | ||
| 237 | * @throws MalformedParameterizedTypeException if the | ||
| 238 | * underlying method's return typed refers to a parameterized | ||
| 239 | * type that cannot be instantiated for any reason | ||
| 240 | * @since 1.5 | ||
| 241 | */ | ||
| 242 | public Type getGenericReturnType() { | ||
| 243 | if (getGenericSignature() != null) { | ||
| 244 | return getGenericInfo().getReturnType(); | ||
| 245 | } else { return getReturnType();} | ||
| 246 | } | ||
| 247 | |||
| 248 | |||
| 249 | /** | ||
| 250 | * Returns an array of {@code Class} objects that represent the formal | ||
| 251 | * parameter types, in declaration order, of the method | ||
| 252 | * represented by this {@code Method} object. Returns an array of length | ||
| 253 | * 0 if the underlying method takes no parameters. | ||
| 254 | * | ||
| 255 | * @return the parameter types for the method this object | ||
| 256 | * represents | ||
| 257 | */ | ||
| 258 | public Class<?>[] getParameterTypes() { | ||
| 259 | return (Class<?>[]) parameterTypes.clone(); | ||
| 260 | } | ||
| 261 | |||
| 262 | /** | ||
| 263 | * Returns an array of {@code Type} objects that represent the formal | ||
| 264 | * parameter types, in declaration order, of the method represented by | ||
| 265 | * this {@code Method} object. Returns an array of length 0 if the | ||
| 266 | * underlying method takes no parameters. | ||
| 267 | * | ||
| 268 | * <p>If a formal parameter type is a parameterized type, | ||
| 269 | * the {@code Type} object returned for it must accurately reflect | ||
| 270 | * the actual type parameters used in the source code. | ||
| 271 | * | ||
| 272 | * <p>If a formal parameter type is a type variable or a parameterized | ||
| 273 | * type, it is created. Otherwise, it is resolved. | ||
| 274 | * | ||
| 275 | * @return an array of Types that represent the formal | ||
| 276 | * parameter types of the underlying method, in declaration order | ||
| 277 | * @throws GenericSignatureFormatError | ||
| 278 | * if the generic method signature does not conform to the format | ||
| 279 | * specified in | ||
| 280 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 281 | * @throws TypeNotPresentException if any of the parameter | ||
| 282 | * types of the underlying method refers to a non-existent type | ||
| 283 | * declaration | ||
| 284 | * @throws MalformedParameterizedTypeException if any of | ||
| 285 | * the underlying method's parameter types refer to a parameterized | ||
| 286 | * type that cannot be instantiated for any reason | ||
| 287 | * @since 1.5 | ||
| 288 | */ | ||
| 289 | public Type[] getGenericParameterTypes() { | ||
| 290 | if (getGenericSignature() != null) | ||
| 291 | return getGenericInfo().getParameterTypes(); | ||
| 292 | else | ||
| 293 | return getParameterTypes(); | ||
| 294 | } | ||
| 295 | |||
| 296 | |||
| 297 | /** | ||
| 298 | * Returns an array of {@code Class} objects that represent | ||
| 299 | * the types of the exceptions declared to be thrown | ||
| 300 | * by the underlying method | ||
| 301 | * represented by this {@code Method} object. Returns an array of length | ||
| 302 | * 0 if the method declares no exceptions in its {@code throws} clause. | ||
| 303 | * | ||
| 304 | * @return the exception types declared as being thrown by the | ||
| 305 | * method this object represents | ||
| 306 | */ | ||
| 307 | public Class<?>[] getExceptionTypes() { | ||
| 308 | return (Class<?>[]) exceptionTypes.clone(); | ||
| 309 | } | ||
| 310 | |||
| 311 | /** | ||
| 312 | * Returns an array of {@code Type} objects that represent the | ||
| 313 | * exceptions declared to be thrown by this {@code Method} object. | ||
| 314 | * Returns an array of length 0 if the underlying method declares | ||
| 315 | * no exceptions in its {@code throws} clause. | ||
| 316 | * | ||
| 317 | * <p>If an exception type is a type variable or a parameterized | ||
| 318 | * type, it is created. Otherwise, it is resolved. | ||
| 319 | * | ||
| 320 | * @return an array of Types that represent the exception types | ||
| 321 | * thrown by the underlying method | ||
| 322 | * @throws GenericSignatureFormatError | ||
| 323 | * if the generic method signature does not conform to the format | ||
| 324 | * specified in | ||
| 325 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 326 | * @throws TypeNotPresentException if the underlying method's | ||
| 327 | * {@code throws} clause refers to a non-existent type declaration | ||
| 328 | * @throws MalformedParameterizedTypeException if | ||
| 329 | * the underlying method's {@code throws} clause refers to a | ||
| 330 | * parameterized type that cannot be instantiated for any reason | ||
| 331 | * @since 1.5 | ||
| 332 | */ | ||
| 333 | public Type[] getGenericExceptionTypes() { | ||
| 334 | Type[] result; | ||
| 335 | if (getGenericSignature() != null && | ||
| 336 | ((result = getGenericInfo().getExceptionTypes()).length > 0)) | ||
| 337 | return result; | ||
| 338 | else | ||
| 339 | return getExceptionTypes(); | ||
| 340 | } | ||
| 341 | |||
| 342 | /** | ||
| 343 | * Compares this {@code Method} against the specified object. Returns | ||
| 344 | * true if the objects are the same. Two {@code Methods} are the same if | ||
| 345 | * they were declared by the same class and have the same name | ||
| 346 | * and formal parameter types and return type. | ||
| 347 | */ | ||
| 348 | public boolean equals(Object obj) { | ||
| 349 | if (obj != null && obj instanceof Method) { | ||
| 350 | Method other = (Method)obj; | ||
| 351 | if ((getDeclaringClass() == other.getDeclaringClass()) | ||
| 352 | && (getName() == other.getName())) { | ||
| 353 | if (!returnType.equals(other.getReturnType())) | ||
| 354 | return false; | ||
| 355 | /* Avoid unnecessary cloning */ | ||
| 356 | Class<?>[] params1 = parameterTypes; | ||
| 357 | Class<?>[] params2 = other.parameterTypes; | ||
| 358 | if (params1.length == params2.length) { | ||
| 359 | for (int i = 0; i < params1.length; i++) { | ||
| 360 | if (params1[i] != params2[i]) | ||
| 361 | return false; | ||
| 362 | } | ||
| 363 | return true; | ||
| 364 | } | ||
| 365 | } | ||
| 366 | } | ||
| 367 | return false; | ||
| 368 | } | ||
| 369 | |||
| 370 | /** | ||
| 371 | * Returns a hashcode for this {@code Method}. The hashcode is computed | ||
| 372 | * as the exclusive-or of the hashcodes for the underlying | ||
| 373 | * method's declaring class name and the method's name. | ||
| 374 | */ | ||
| 375 | public int hashCode() { | ||
| 376 | return getDeclaringClass().getName().hashCode() ^ getName().hashCode(); | ||
| 377 | } | ||
| 378 | |||
| 379 | /** | ||
| 380 | * Returns a string describing this {@code Method}. The string is | ||
| 381 | * formatted as the method access modifiers, if any, followed by | ||
| 382 | * the method return type, followed by a space, followed by the | ||
| 383 | * class declaring the method, followed by a period, followed by | ||
| 384 | * the method name, followed by a parenthesized, comma-separated | ||
| 385 | * list of the method's formal parameter types. If the method | ||
| 386 | * throws checked exceptions, the parameter list is followed by a | ||
| 387 | * space, followed by the word throws followed by a | ||
| 388 | * comma-separated list of the thrown exception types. | ||
| 389 | * For example: | ||
| 390 | * <pre> | ||
| 391 | * public boolean java.lang.Object.equals(java.lang.Object) | ||
| 392 | * </pre> | ||
| 393 | * | ||
| 394 | * <p>The access modifiers are placed in canonical order as | ||
| 395 | * specified by "The Java Language Specification". This is | ||
| 396 | * {@code public}, {@code protected} or {@code private} first, | ||
| 397 | * and then other modifiers in the following order: | ||
| 398 | * {@code abstract}, {@code static}, {@code final}, | ||
| 399 | * {@code synchronized}, {@code native}, {@code strictfp}. | ||
| 400 | */ | ||
| 401 | public String toString() { | ||
| 402 | try { | ||
| 403 | StringBuilder sb = new StringBuilder(); | ||
| 404 | int mod = getModifiers() & Modifier.methodModifiers(); | ||
| 405 | if (mod != 0) { | ||
| 406 | sb.append(Modifier.toString(mod)).append(' '); | ||
| 407 | } | ||
| 408 | sb.append(Field.getTypeName(getReturnType())).append(' '); | ||
| 409 | sb.append(Field.getTypeName(getDeclaringClass())).append('.'); | ||
| 410 | sb.append(getName()).append('('); | ||
| 411 | Class<?>[] params = parameterTypes; // avoid clone | ||
| 412 | for (int j = 0; j < params.length; j++) { | ||
| 413 | sb.append(Field.getTypeName(params[j])); | ||
| 414 | if (j < (params.length - 1)) | ||
| 415 | sb.append(','); | ||
| 416 | } | ||
| 417 | sb.append(')'); | ||
| 418 | Class<?>[] exceptions = exceptionTypes; // avoid clone | ||
| 419 | if (exceptions.length > 0) { | ||
| 420 | sb.append(" throws "); | ||
| 421 | for (int k = 0; k < exceptions.length; k++) { | ||
| 422 | sb.append(exceptions[k].getName()); | ||
| 423 | if (k < (exceptions.length - 1)) | ||
| 424 | sb.append(','); | ||
| 425 | } | ||
| 426 | } | ||
| 427 | return sb.toString(); | ||
| 428 | } catch (Exception e) { | ||
| 429 | return "<" + e + ">"; | ||
| 430 | } | ||
| 431 | } | ||
| 432 | |||
| 433 | /** | ||
| 434 | * Returns a string describing this {@code Method}, including | ||
| 435 | * type parameters. The string is formatted as the method access | ||
| 436 | * modifiers, if any, followed by an angle-bracketed | ||
| 437 | * comma-separated list of the method's type parameters, if any, | ||
| 438 | * followed by the method's generic return type, followed by a | ||
| 439 | * space, followed by the class declaring the method, followed by | ||
| 440 | * a period, followed by the method name, followed by a | ||
| 441 | * parenthesized, comma-separated list of the method's generic | ||
| 442 | * formal parameter types. | ||
| 443 | * | ||
| 444 | * If this method was declared to take a variable number of | ||
| 445 | * arguments, instead of denoting the last parameter as | ||
| 446 | * "<tt><i>Type</i>[]</tt>", it is denoted as | ||
| 447 | * "<tt><i>Type</i>...</tt>". | ||
| 448 | * | ||
| 449 | * A space is used to separate access modifiers from one another | ||
| 450 | * and from the type parameters or return type. If there are no | ||
| 451 | * type parameters, the type parameter list is elided; if the type | ||
| 452 | * parameter list is present, a space separates the list from the | ||
| 453 | * class name. If the method is declared to throw exceptions, the | ||
| 454 | * parameter list is followed by a space, followed by the word | ||
| 455 | * throws followed by a comma-separated list of the generic thrown | ||
| 456 | * exception types. If there are no type parameters, the type | ||
| 457 | * parameter list is elided. | ||
| 458 | * | ||
| 459 | * <p>The access modifiers are placed in canonical order as | ||
| 460 | * specified by "The Java Language Specification". This is | ||
| 461 | * {@code public}, {@code protected} or {@code private} first, | ||
| 462 | * and then other modifiers in the following order: | ||
| 463 | * {@code abstract}, {@code static}, {@code final}, | ||
| 464 | * {@code synchronized}, {@code native}, {@code strictfp}. | ||
| 465 | * | ||
| 466 | * @return a string describing this {@code Method}, | ||
| 467 | * include type parameters | ||
| 468 | * | ||
| 469 | * @since 1.5 | ||
| 470 | */ | ||
| 471 | public String toGenericString() { | ||
| 472 | try { | ||
| 473 | StringBuilder sb = new StringBuilder(); | ||
| 474 | int mod = getModifiers() & Modifier.methodModifiers(); | ||
| 475 | if (mod != 0) { | ||
| 476 | sb.append(Modifier.toString(mod)).append(' '); | ||
| 477 | } | ||
| 478 | TypeVariable<?>[] typeparms = getTypeParameters(); | ||
| 479 | if (typeparms.length > 0) { | ||
| 480 | boolean first = true; | ||
| 481 | sb.append('<'); | ||
| 482 | for(TypeVariable<?> typeparm: typeparms) { | ||
| 483 | if (!first) | ||
| 484 | sb.append(','); | ||
| 485 | // Class objects can't occur here; no need to test | ||
| 486 | // and call Class.getName(). | ||
| 487 | sb.append(typeparm.toString()); | ||
| 488 | first = false; | ||
| 489 | } | ||
| 490 | sb.append("> "); | ||
| 491 | } | ||
| 492 | |||
| 493 | Type genRetType = getGenericReturnType(); | ||
| 494 | sb.append( ((genRetType instanceof Class<?>)? | ||
| 495 | Field.getTypeName((Class<?>)genRetType):genRetType.toString())) | ||
| 496 | .append(' '); | ||
| 497 | |||
| 498 | sb.append(Field.getTypeName(getDeclaringClass())).append('.'); | ||
| 499 | sb.append(getName()).append('('); | ||
| 500 | Type[] params = getGenericParameterTypes(); | ||
| 501 | for (int j = 0; j < params.length; j++) { | ||
| 502 | String param = (params[j] instanceof Class)? | ||
| 503 | Field.getTypeName((Class)params[j]): | ||
| 504 | (params[j].toString()); | ||
| 505 | if (isVarArgs() && (j == params.length - 1)) // replace T[] with T... | ||
| 506 | param = param.replaceFirst("\\[\\]$", "..."); | ||
| 507 | sb.append(param); | ||
| 508 | if (j < (params.length - 1)) | ||
| 509 | sb.append(','); | ||
| 510 | } | ||
| 511 | sb.append(')'); | ||
| 512 | Type[] exceptions = getGenericExceptionTypes(); | ||
| 513 | if (exceptions.length > 0) { | ||
| 514 | sb.append(" throws "); | ||
| 515 | for (int k = 0; k < exceptions.length; k++) { | ||
| 516 | sb.append((exceptions[k] instanceof Class)? | ||
| 517 | ((Class)exceptions[k]).getName(): | ||
| 518 | exceptions[k].toString()); | ||
| 519 | if (k < (exceptions.length - 1)) | ||
| 520 | sb.append(','); | ||
| 521 | } | ||
| 522 | } | ||
| 523 | return sb.toString(); | ||
| 524 | } catch (Exception e) { | ||
| 525 | return "<" + e + ">"; | ||
| 526 | } | ||
| 527 | } | ||
| 528 | |||
| 529 | /** | ||
| 530 | * Invokes the underlying method represented by this {@code Method} | ||
| 531 | * object, on the specified object with the specified parameters. | ||
| 532 | * Individual parameters are automatically unwrapped to match | ||
| 533 | * primitive formal parameters, and both primitive and reference | ||
| 534 | * parameters are subject to method invocation conversions as | ||
| 535 | * necessary. | ||
| 536 | * | ||
| 537 | * <p>If the underlying method is static, then the specified {@code obj} | ||
| 538 | * argument is ignored. It may be null. | ||
| 539 | * | ||
| 540 | * <p>If the number of formal parameters required by the underlying method is | ||
| 541 | * 0, the supplied {@code args} array may be of length 0 or null. | ||
| 542 | * | ||
| 543 | * <p>If the underlying method is an instance method, it is invoked | ||
| 544 | * using dynamic method lookup as documented in The Java Language | ||
| 545 | * Specification, Second Edition, section 15.12.4.4; in particular, | ||
| 546 | * overriding based on the runtime type of the target object will occur. | ||
| 547 | * | ||
| 548 | * <p>If the underlying method is static, the class that declared | ||
| 549 | * the method is initialized if it has not already been initialized. | ||
| 550 | * | ||
| 551 | * <p>If the method completes normally, the value it returns is | ||
| 552 | * returned to the caller of invoke; if the value has a primitive | ||
| 553 | * type, it is first appropriately wrapped in an object. However, | ||
| 554 | * if the value has the type of an array of a primitive type, the | ||
| 555 | * elements of the array are <i>not</i> wrapped in objects; in | ||
| 556 | * other words, an array of primitive type is returned. If the | ||
| 557 | * underlying method return type is void, the invocation returns | ||
| 558 | * null. | ||
| 559 | * | ||
| 560 | * @param obj the object the underlying method is invoked from | ||
| 561 | * @param args the arguments used for the method call | ||
| 562 | * @return the result of dispatching the method represented by | ||
| 563 | * this object on {@code obj} with parameters | ||
| 564 | * {@code args} | ||
| 565 | * | ||
| 566 | * @exception IllegalAccessException if this {@code Method} object | ||
| 567 | * is enforcing Java language access control and the underlying | ||
| 568 | * method is inaccessible. | ||
| 569 | * @exception IllegalArgumentException if the method is an | ||
| 570 | * instance method and the specified object argument | ||
| 571 | * is not an instance of the class or interface | ||
| 572 | * declaring the underlying method (or of a subclass | ||
| 573 | * or implementor thereof); if the number of actual | ||
| 574 | * and formal parameters differ; if an unwrapping | ||
| 575 | * conversion for primitive arguments fails; or if, | ||
| 576 | * after possible unwrapping, a parameter value | ||
| 577 | * cannot be converted to the corresponding formal | ||
| 578 | * parameter type by a method invocation conversion. | ||
| 579 | * @exception InvocationTargetException if the underlying method | ||
| 580 | * throws an exception. | ||
| 581 | * @exception NullPointerException if the specified object is null | ||
| 582 | * and the method is an instance method. | ||
| 583 | * @exception ExceptionInInitializerError if the initialization | ||
| 584 | * provoked by this method fails. | ||
| 585 | */ | ||
| 586 | public Object invoke(Object obj, Object... args) | ||
| 587 | throws IllegalAccessException, IllegalArgumentException, | ||
| 588 | InvocationTargetException | ||
| 589 | { | ||
| 590 | if (!override) { | ||
| 591 | if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { | ||
| 592 | Class<?> caller = Reflection.getCallerClass(1); | ||
| 593 | |||
| 594 | checkAccess(caller, clazz, obj, modifiers); | ||
| 595 | } | ||
| 596 | } | ||
| 597 | MethodAccessor ma = methodAccessor; // read volatile | ||
| 598 | if (ma == null) { | ||
| 599 | ma = acquireMethodAccessor(); | ||
| 600 | } | ||
| 601 | return ma.invoke(obj, args); | ||
| 602 | } | ||
| 603 | |||
| 604 | /** | ||
| 605 | * Returns {@code true} if this method is a bridge | ||
| 606 | * method; returns {@code false} otherwise. | ||
| 607 | * | ||
| 608 | * @return true if and only if this method is a bridge | ||
| 609 | * method as defined by the Java Language Specification. | ||
| 610 | * @since 1.5 | ||
| 611 | */ | ||
| 612 | public boolean isBridge() { | ||
| 613 | return (getModifiers() & Modifier.BRIDGE) != 0; | ||
| 614 | } | ||
| 615 | |||
| 616 | /** | ||
| 617 | * Returns {@code true} if this method was declared to take | ||
| 618 | * a variable number of arguments; returns {@code false} | ||
| 619 | * otherwise. | ||
| 620 | * | ||
| 621 | * @return {@code true} if an only if this method was declared to | ||
| 622 | * take a variable number of arguments. | ||
| 623 | * @since 1.5 | ||
| 624 | */ | ||
| 625 | public boolean isVarArgs() { | ||
| 626 | return (getModifiers() & Modifier.VARARGS) != 0; | ||
| 627 | } | ||
| 628 | |||
| 629 | /** | ||
| 630 | * Returns {@code true} if this method is a synthetic | ||
| 631 | * method; returns {@code false} otherwise. | ||
| 632 | * | ||
| 633 | * @return true if and only if this method is a synthetic | ||
| 634 | * method as defined by the Java Language Specification. | ||
| 635 | * @since 1.5 | ||
| 636 | */ | ||
| 637 | public boolean isSynthetic() { | ||
| 638 | return Modifier.isSynthetic(getModifiers()); | ||
| 639 | } | ||
| 640 | |||
| 641 | // NOTE that there is no synchronization used here. It is correct | ||
| 642 | // (though not efficient) to generate more than one MethodAccessor | ||
| 643 | // for a given Method. However, avoiding synchronization will | ||
| 644 | // probably make the implementation more scalable. | ||
| 645 | private MethodAccessor acquireMethodAccessor() { | ||
| 646 | // First check to see if one has been created yet, and take it | ||
| 647 | // if so | ||
| 648 | MethodAccessor tmp = null; | ||
| 649 | if (root != null) tmp = root.getMethodAccessor(); | ||
| 650 | if (tmp != null) { | ||
| 651 | methodAccessor = tmp; | ||
| 652 | } else { | ||
| 653 | // Otherwise fabricate one and propagate it up to the root | ||
| 654 | tmp = reflectionFactory.newMethodAccessor(this); | ||
| 655 | setMethodAccessor(tmp); | ||
| 656 | } | ||
| 657 | |||
| 658 | return tmp; | ||
| 659 | } | ||
| 660 | |||
| 661 | // Returns MethodAccessor for this Method object, not looking up | ||
| 662 | // the chain to the root | ||
| 663 | MethodAccessor getMethodAccessor() { | ||
| 664 | return methodAccessor; | ||
| 665 | } | ||
| 666 | |||
| 667 | // Sets the MethodAccessor for this Method object and | ||
| 668 | // (recursively) its root | ||
| 669 | void setMethodAccessor(MethodAccessor accessor) { | ||
| 670 | methodAccessor = accessor; | ||
| 671 | // Propagate up | ||
| 672 | if (root != null) { | ||
| 673 | root.setMethodAccessor(accessor); | ||
| 674 | } | ||
| 675 | } | ||
| 676 | |||
| 677 | /** | ||
| 678 | * @throws NullPointerException {@inheritDoc} | ||
| 679 | * @since 1.5 | ||
| 680 | */ | ||
| 681 | public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { | ||
| 682 | if (annotationClass == null) | ||
| 683 | throw new NullPointerException(); | ||
| 684 | |||
| 685 | return (T) declaredAnnotations().get(annotationClass); | ||
| 686 | } | ||
| 687 | |||
| 688 | /** | ||
| 689 | * @since 1.5 | ||
| 690 | */ | ||
| 691 | public Annotation[] getDeclaredAnnotations() { | ||
| 692 | return AnnotationParser.toArray(declaredAnnotations()); | ||
| 693 | } | ||
| 694 | |||
| 695 | private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations; | ||
| 696 | |||
| 697 | private synchronized Map<Class<? extends Annotation>, Annotation> declaredAnnotations() { | ||
| 698 | if (declaredAnnotations == null) { | ||
| 699 | declaredAnnotations = AnnotationParser.parseAnnotations( | ||
| 700 | annotations, sun.misc.SharedSecrets.getJavaLangAccess(). | ||
| 701 | getConstantPool(getDeclaringClass()), | ||
| 702 | getDeclaringClass()); | ||
| 703 | } | ||
| 704 | return declaredAnnotations; | ||
| 705 | } | ||
| 706 | |||
| 707 | /** | ||
| 708 | * Returns the default value for the annotation member represented by | ||
| 709 | * this {@code Method} instance. If the member is of a primitive type, | ||
| 710 | * an instance of the corresponding wrapper type is returned. Returns | ||
| 711 | * null if no default is associated with the member, or if the method | ||
| 712 | * instance does not represent a declared member of an annotation type. | ||
| 713 | * | ||
| 714 | * @return the default value for the annotation member represented | ||
| 715 | * by this {@code Method} instance. | ||
| 716 | * @throws TypeNotPresentException if the annotation is of type | ||
| 717 | * {@link Class} and no definition can be found for the | ||
| 718 | * default class value. | ||
| 719 | * @since 1.5 | ||
| 720 | */ | ||
| 721 | public Object getDefaultValue() { | ||
| 722 | if (annotationDefault == null) | ||
| 723 | return null; | ||
| 724 | Class<?> memberType = AnnotationType.invocationHandlerReturnType( | ||
| 725 | getReturnType()); | ||
| 726 | Object result = AnnotationParser.parseMemberValue( | ||
| 727 | memberType, ByteBuffer.wrap(annotationDefault), | ||
| 728 | sun.misc.SharedSecrets.getJavaLangAccess(). | ||
| 729 | getConstantPool(getDeclaringClass()), | ||
| 730 | getDeclaringClass()); | ||
| 731 | if (result instanceof sun.reflect.annotation.ExceptionProxy) | ||
| 732 | throw new AnnotationFormatError("Invalid default: " + this); | ||
| 733 | return result; | ||
| 734 | } | ||
| 735 | |||
| 736 | /** | ||
| 737 | * Returns an array of arrays that represent the annotations on the formal | ||
| 738 | * parameters, in declaration order, of the method represented by | ||
| 739 | * this {@code Method} object. (Returns an array of length zero if the | ||
| 740 | * underlying method is parameterless. If the method has one or more | ||
| 741 | * parameters, a nested array of length zero is returned for each parameter | ||
| 742 | * with no annotations.) The annotation objects contained in the returned | ||
| 743 | * arrays are serializable. The caller of this method is free to modify | ||
| 744 | * the returned arrays; it will have no effect on the arrays returned to | ||
| 745 | * other callers. | ||
| 746 | * | ||
| 747 | * @return an array of arrays that represent the annotations on the formal | ||
| 748 | * parameters, in declaration order, of the method represented by this | ||
| 749 | * Method object | ||
| 750 | * @since 1.5 | ||
| 751 | */ | ||
| 752 | public Annotation[][] getParameterAnnotations() { | ||
| 753 | int numParameters = parameterTypes.length; | ||
| 754 | if (parameterAnnotations == null) | ||
| 755 | return new Annotation[numParameters][0]; | ||
| 756 | |||
| 757 | Annotation[][] result = AnnotationParser.parseParameterAnnotations( | ||
| 758 | parameterAnnotations, | ||
| 759 | sun.misc.SharedSecrets.getJavaLangAccess(). | ||
| 760 | getConstantPool(getDeclaringClass()), | ||
| 761 | getDeclaringClass()); | ||
| 762 | if (result.length != numParameters) | ||
| 763 | throw new java.lang.annotation.AnnotationFormatError( | ||
| 764 | "Parameter annotations don't match number of parameters"); | ||
| 765 | return result; | ||
| 766 | } | ||
| 767 | } | ||