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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2010, 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.ConstructorAccessor; | ||
| 29 | import sun.reflect.Reflection; | ||
| 30 | import sun.reflect.generics.repository.ConstructorRepository; | ||
| 31 | import sun.reflect.generics.factory.CoreReflectionFactory; | ||
| 32 | import sun.reflect.generics.factory.GenericsFactory; | ||
| 33 | import sun.reflect.generics.scope.ConstructorScope; | ||
| 34 | import java.lang.annotation.Annotation; | ||
| 35 | import java.util.Map; | ||
| 36 | import sun.reflect.annotation.AnnotationParser; | ||
| 37 | import java.lang.annotation.AnnotationFormatError; | ||
| 38 | import java.lang.reflect.Modifier; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * {@code Constructor} provides information about, and access to, a single | ||
| 42 | * constructor for a class. | ||
| 43 | * | ||
| 44 | * <p>{@code Constructor} permits widening conversions to occur when matching the | ||
| 45 | * actual parameters to newInstance() with the underlying | ||
| 46 | * constructor's formal parameters, but throws an | ||
| 47 | * {@code IllegalArgumentException} if a narrowing conversion would occur. | ||
| 48 | * | ||
| 49 | * @param <T> the class in which the constructor is declared | ||
| 50 | * | ||
| 51 | * @see Member | ||
| 52 | * @see java.lang.Class | ||
| 53 | * @see java.lang.Class#getConstructors() | ||
| 54 | * @see java.lang.Class#getConstructor(Class[]) | ||
| 55 | * @see java.lang.Class#getDeclaredConstructors() | ||
| 56 | * | ||
| 57 | * @author Kenneth Russell | ||
| 58 | * @author Nakul Saraiya | ||
| 59 | */ | ||
| 60 | public final | ||
| 61 | class Constructor<T> extends AccessibleObject implements | ||
| 62 | GenericDeclaration, | ||
| 63 | Member { | ||
| 64 | |||
| 65 | private Class<T> clazz; | ||
| 66 | private int slot; | ||
| 67 | private Class<?>[] parameterTypes; | ||
| 68 | private Class<?>[] exceptionTypes; | ||
| 69 | private int modifiers; | ||
| 70 | // Generics and annotations support | ||
| 71 | private transient String signature; | ||
| 72 | // generic info repository; lazily initialized | ||
| 73 | private transient ConstructorRepository genericInfo; | ||
| 74 | private byte[] annotations; | ||
| 75 | private byte[] parameterAnnotations; | ||
| 76 | |||
| 77 | // Generics infrastructure | ||
| 78 | // Accessor for factory | ||
| 79 | private GenericsFactory getFactory() { | ||
| 80 | // create scope and factory | ||
| 81 | return CoreReflectionFactory.make(this, ConstructorScope.make(this)); | ||
| 82 | } | ||
| 83 | |||
| 84 | // Accessor for generic info repository | ||
| 85 | private ConstructorRepository getGenericInfo() { | ||
| 86 | // lazily initialize repository if necessary | ||
| 87 | if (genericInfo == null) { | ||
| 88 | // create and cache generic info repository | ||
| 89 | genericInfo = | ||
| 90 | ConstructorRepository.make(getSignature(), | ||
| 91 | getFactory()); | ||
| 92 | } | ||
| 93 | return genericInfo; //return cached repository | ||
| 94 | } | ||
| 95 | |||
| 96 | private volatile ConstructorAccessor constructorAccessor; | ||
| 97 | // For sharing of ConstructorAccessors. This branching structure | ||
| 98 | // is currently only two levels deep (i.e., one root Constructor | ||
| 99 | // and potentially many Constructor objects pointing to it.) | ||
| 100 | private Constructor<T> root; | ||
| 101 | |||
| 102 | /** | ||
| 103 | * Package-private constructor used by ReflectAccess to enable | ||
| 104 | * instantiation of these objects in Java code from the java.lang | ||
| 105 | * package via sun.reflect.LangReflectAccess. | ||
| 106 | */ | ||
| 107 | Constructor(Class<T> declaringClass, | ||
| 108 | Class<?>[] parameterTypes, | ||
| 109 | Class<?>[] checkedExceptions, | ||
| 110 | int modifiers, | ||
| 111 | int slot, | ||
| 112 | String signature, | ||
| 113 | byte[] annotations, | ||
| 114 | byte[] parameterAnnotations) | ||
| 115 | { | ||
| 116 | this.clazz = declaringClass; | ||
| 117 | this.parameterTypes = parameterTypes; | ||
| 118 | this.exceptionTypes = checkedExceptions; | ||
| 119 | this.modifiers = modifiers; | ||
| 120 | this.slot = slot; | ||
| 121 | this.signature = signature; | ||
| 122 | this.annotations = annotations; | ||
| 123 | this.parameterAnnotations = parameterAnnotations; | ||
| 124 | } | ||
| 125 | |||
| 126 | /** | ||
| 127 | * Package-private routine (exposed to java.lang.Class via | ||
| 128 | * ReflectAccess) which returns a copy of this Constructor. The copy's | ||
| 129 | * "root" field points to this Constructor. | ||
| 130 | */ | ||
| 131 | Constructor<T> copy() { | ||
| 132 | // This routine enables sharing of ConstructorAccessor objects | ||
| 133 | // among Constructor objects which refer to the same underlying | ||
| 134 | // method in the VM. (All of this contortion is only necessary | ||
| 135 | // because of the "accessibility" bit in AccessibleObject, | ||
| 136 | // which implicitly requires that new java.lang.reflect | ||
| 137 | // objects be fabricated for each reflective call on Class | ||
| 138 | // objects.) | ||
| 139 | Constructor<T> res = new Constructor<>(clazz, | ||
| 140 | parameterTypes, | ||
| 141 | exceptionTypes, modifiers, slot, | ||
| 142 | signature, | ||
| 143 | annotations, | ||
| 144 | parameterAnnotations); | ||
| 145 | res.root = this; | ||
| 146 | // Might as well eagerly propagate this if already present | ||
| 147 | res.constructorAccessor = constructorAccessor; | ||
| 148 | return res; | ||
| 149 | } | ||
| 150 | |||
| 151 | /** | ||
| 152 | * Returns the {@code Class} object representing the class that declares | ||
| 153 | * the constructor represented by this {@code Constructor} object. | ||
| 154 | */ | ||
| 155 | public Class<T> getDeclaringClass() { | ||
| 156 | return clazz; | ||
| 157 | } | ||
| 158 | |||
| 159 | /** | ||
| 160 | * Returns the name of this constructor, as a string. This is | ||
| 161 | * the binary name of the constructor's declaring class. | ||
| 162 | */ | ||
| 163 | public String getName() { | ||
| 164 | return getDeclaringClass().getName(); | ||
| 165 | } | ||
| 166 | |||
| 167 | /** | ||
| 168 | * Returns the Java language modifiers for the constructor | ||
| 169 | * represented by this {@code Constructor} object, as an integer. The | ||
| 170 | * {@code Modifier} class should be used to decode the modifiers. | ||
| 171 | * | ||
| 172 | * @see Modifier | ||
| 173 | */ | ||
| 174 | public int getModifiers() { | ||
| 175 | return modifiers; | ||
| 176 | } | ||
| 177 | |||
| 178 | /** | ||
| 179 | * Returns an array of {@code TypeVariable} objects that represent the | ||
| 180 | * type variables declared by the generic declaration represented by this | ||
| 181 | * {@code GenericDeclaration} object, in declaration order. Returns an | ||
| 182 | * array of length 0 if the underlying generic declaration declares no type | ||
| 183 | * variables. | ||
| 184 | * | ||
| 185 | * @return an array of {@code TypeVariable} objects that represent | ||
| 186 | * the type variables declared by this generic declaration | ||
| 187 | * @throws GenericSignatureFormatError if the generic | ||
| 188 | * signature of this generic declaration does not conform to | ||
| 189 | * the format specified in | ||
| 190 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 191 | * @since 1.5 | ||
| 192 | */ | ||
| 193 | public TypeVariable<Constructor<T>>[] getTypeParameters() { | ||
| 194 | if (getSignature() != null) { | ||
| 195 | return (TypeVariable<Constructor<T>>[])getGenericInfo().getTypeParameters(); | ||
| 196 | } else | ||
| 197 | return (TypeVariable<Constructor<T>>[])new TypeVariable[0]; | ||
| 198 | } | ||
| 199 | |||
| 200 | |||
| 201 | /** | ||
| 202 | * Returns an array of {@code Class} objects that represent the formal | ||
| 203 | * parameter types, in declaration order, of the constructor | ||
| 204 | * represented by this {@code Constructor} object. Returns an array of | ||
| 205 | * length 0 if the underlying constructor takes no parameters. | ||
| 206 | * | ||
| 207 | * @return the parameter types for the constructor this object | ||
| 208 | * represents | ||
| 209 | */ | ||
| 210 | public Class<?>[] getParameterTypes() { | ||
| 211 | return (Class<?>[]) parameterTypes.clone(); | ||
| 212 | } | ||
| 213 | |||
| 214 | |||
| 215 | /** | ||
| 216 | * Returns an array of {@code Type} objects that represent the formal | ||
| 217 | * parameter types, in declaration order, of the method represented by | ||
| 218 | * this {@code Constructor} object. Returns an array of length 0 if the | ||
| 219 | * underlying method takes no parameters. | ||
| 220 | * | ||
| 221 | * <p>If a formal parameter type is a parameterized type, | ||
| 222 | * the {@code Type} object returned for it must accurately reflect | ||
| 223 | * the actual type parameters used in the source code. | ||
| 224 | * | ||
| 225 | * <p>If a formal parameter type is a type variable or a parameterized | ||
| 226 | * type, it is created. Otherwise, it is resolved. | ||
| 227 | * | ||
| 228 | * @return an array of {@code Type}s that represent the formal | ||
| 229 | * parameter types of the underlying method, in declaration order | ||
| 230 | * @throws GenericSignatureFormatError | ||
| 231 | * if the generic method signature does not conform to the format | ||
| 232 | * specified in | ||
| 233 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 234 | * @throws TypeNotPresentException if any of the parameter | ||
| 235 | * types of the underlying method refers to a non-existent type | ||
| 236 | * declaration | ||
| 237 | * @throws MalformedParameterizedTypeException if any of | ||
| 238 | * the underlying method's parameter types refer to a parameterized | ||
| 239 | * type that cannot be instantiated for any reason | ||
| 240 | * @since 1.5 | ||
| 241 | */ | ||
| 242 | public Type[] getGenericParameterTypes() { | ||
| 243 | if (getSignature() != null) | ||
| 244 | return getGenericInfo().getParameterTypes(); | ||
| 245 | else | ||
| 246 | return getParameterTypes(); | ||
| 247 | } | ||
| 248 | |||
| 249 | |||
| 250 | /** | ||
| 251 | * Returns an array of {@code Class} objects that represent the types | ||
| 252 | * of exceptions declared to be thrown by the underlying constructor | ||
| 253 | * represented by this {@code Constructor} object. Returns an array of | ||
| 254 | * length 0 if the constructor declares no exceptions in its {@code throws} clause. | ||
| 255 | * | ||
| 256 | * @return the exception types declared as being thrown by the | ||
| 257 | * constructor this object represents | ||
| 258 | */ | ||
| 259 | public Class<?>[] getExceptionTypes() { | ||
| 260 | return (Class<?>[])exceptionTypes.clone(); | ||
| 261 | } | ||
| 262 | |||
| 263 | |||
| 264 | /** | ||
| 265 | * Returns an array of {@code Type} objects that represent the | ||
| 266 | * exceptions declared to be thrown by this {@code Constructor} object. | ||
| 267 | * Returns an array of length 0 if the underlying method declares | ||
| 268 | * no exceptions in its {@code throws} clause. | ||
| 269 | * | ||
| 270 | * <p>If an exception type is a type variable or a parameterized | ||
| 271 | * type, it is created. Otherwise, it is resolved. | ||
| 272 | * | ||
| 273 | * @return an array of Types that represent the exception types | ||
| 274 | * thrown by the underlying method | ||
| 275 | * @throws GenericSignatureFormatError | ||
| 276 | * if the generic method signature does not conform to the format | ||
| 277 | * specified in | ||
| 278 | * <cite>The Java™ Virtual Machine Specification</cite> | ||
| 279 | * @throws TypeNotPresentException if the underlying method's | ||
| 280 | * {@code throws} clause refers to a non-existent type declaration | ||
| 281 | * @throws MalformedParameterizedTypeException if | ||
| 282 | * the underlying method's {@code throws} clause refers to a | ||
| 283 | * parameterized type that cannot be instantiated for any reason | ||
| 284 | * @since 1.5 | ||
| 285 | */ | ||
| 286 | public Type[] getGenericExceptionTypes() { | ||
| 287 | Type[] result; | ||
| 288 | if (getSignature() != null && | ||
| 289 | ( (result = getGenericInfo().getExceptionTypes()).length > 0 )) | ||
| 290 | return result; | ||
| 291 | else | ||
| 292 | return getExceptionTypes(); | ||
| 293 | } | ||
| 294 | |||
| 295 | /** | ||
| 296 | * Compares this {@code Constructor} against the specified object. | ||
| 297 | * Returns true if the objects are the same. Two {@code Constructor} objects are | ||
| 298 | * the same if they were declared by the same class and have the | ||
| 299 | * same formal parameter types. | ||
| 300 | */ | ||
| 301 | public boolean equals(Object obj) { | ||
| 302 | if (obj != null && obj instanceof Constructor) { | ||
| 303 | Constructor<?> other = (Constructor<?>)obj; | ||
| 304 | if (getDeclaringClass() == other.getDeclaringClass()) { | ||
| 305 | /* Avoid unnecessary cloning */ | ||
| 306 | Class<?>[] params1 = parameterTypes; | ||
| 307 | Class<?>[] params2 = other.parameterTypes; | ||
| 308 | if (params1.length == params2.length) { | ||
| 309 | for (int i = 0; i < params1.length; i++) { | ||
| 310 | if (params1[i] != params2[i]) | ||
| 311 | return false; | ||
| 312 | } | ||
| 313 | return true; | ||
| 314 | } | ||
| 315 | } | ||
| 316 | } | ||
| 317 | return false; | ||
| 318 | } | ||
| 319 | |||
| 320 | /** | ||
| 321 | * Returns a hashcode for this {@code Constructor}. The hashcode is | ||
| 322 | * the same as the hashcode for the underlying constructor's | ||
| 323 | * declaring class name. | ||
| 324 | */ | ||
| 325 | public int hashCode() { | ||
| 326 | return getDeclaringClass().getName().hashCode(); | ||
| 327 | } | ||
| 328 | |||
| 329 | /** | ||
| 330 | * Returns a string describing this {@code Constructor}. The string is | ||
| 331 | * formatted as the constructor access modifiers, if any, | ||
| 332 | * followed by the fully-qualified name of the declaring class, | ||
| 333 | * followed by a parenthesized, comma-separated list of the | ||
| 334 | * constructor's formal parameter types. For example: | ||
| 335 | * <pre> | ||
| 336 | * public java.util.Hashtable(int,float) | ||
| 337 | * </pre> | ||
| 338 | * | ||
| 339 | * <p>The only possible modifiers for constructors are the access | ||
| 340 | * modifiers {@code public}, {@code protected} or | ||
| 341 | * {@code private}. Only one of these may appear, or none if the | ||
| 342 | * constructor has default (package) access. | ||
| 343 | */ | ||
| 344 | public String toString() { | ||
| 345 | try { | ||
| 346 | StringBuffer sb = new StringBuffer(); | ||
| 347 | int mod = getModifiers() & Modifier.constructorModifiers(); | ||
| 348 | if (mod != 0) { | ||
| 349 | sb.append(Modifier.toString(mod) + " "); | ||
| 350 | } | ||
| 351 | sb.append(Field.getTypeName(getDeclaringClass())); | ||
| 352 | sb.append("("); | ||
| 353 | Class<?>[] params = parameterTypes; // avoid clone | ||
| 354 | for (int j = 0; j < params.length; j++) { | ||
| 355 | sb.append(Field.getTypeName(params[j])); | ||
| 356 | if (j < (params.length - 1)) | ||
| 357 | sb.append(","); | ||
| 358 | } | ||
| 359 | sb.append(")"); | ||
| 360 | Class<?>[] exceptions = exceptionTypes; // avoid clone | ||
| 361 | if (exceptions.length > 0) { | ||
| 362 | sb.append(" throws "); | ||
| 363 | for (int k = 0; k < exceptions.length; k++) { | ||
| 364 | sb.append(exceptions[k].getName()); | ||
| 365 | if (k < (exceptions.length - 1)) | ||
| 366 | sb.append(","); | ||
| 367 | } | ||
| 368 | } | ||
| 369 | return sb.toString(); | ||
| 370 | } catch (Exception e) { | ||
| 371 | return "<" + e + ">"; | ||
| 372 | } | ||
| 373 | } | ||
| 374 | |||
| 375 | /** | ||
| 376 | * Returns a string describing this {@code Constructor}, | ||
| 377 | * including type parameters. The string is formatted as the | ||
| 378 | * constructor access modifiers, if any, followed by an | ||
| 379 | * angle-bracketed comma separated list of the constructor's type | ||
| 380 | * parameters, if any, followed by the fully-qualified name of the | ||
| 381 | * declaring class, followed by a parenthesized, comma-separated | ||
| 382 | * list of the constructor's generic formal parameter types. | ||
| 383 | * | ||
| 384 | * If this constructor was declared to take a variable number of | ||
| 385 | * arguments, instead of denoting the last parameter as | ||
| 386 | * "<tt><i>Type</i>[]</tt>", it is denoted as | ||
| 387 | * "<tt><i>Type</i>...</tt>". | ||
| 388 | * | ||
| 389 | * A space is used to separate access modifiers from one another | ||
| 390 | * and from the type parameters or return type. If there are no | ||
| 391 | * type parameters, the type parameter list is elided; if the type | ||
| 392 | * parameter list is present, a space separates the list from the | ||
| 393 | * class name. If the constructor is declared to throw | ||
| 394 | * exceptions, the parameter list is followed by a space, followed | ||
| 395 | * by the word "{@code throws}" followed by a | ||
| 396 | * comma-separated list of the thrown exception types. | ||
| 397 | * | ||
| 398 | * <p>The only possible modifiers for constructors are the access | ||
| 399 | * modifiers {@code public}, {@code protected} or | ||
| 400 | * {@code private}. Only one of these may appear, or none if the | ||
| 401 | * constructor has default (package) access. | ||
| 402 | * | ||
| 403 | * @return a string describing this {@code Constructor}, | ||
| 404 | * include type parameters | ||
| 405 | * | ||
| 406 | * @since 1.5 | ||
| 407 | */ | ||
| 408 | public String toGenericString() { | ||
| 409 | try { | ||
| 410 | StringBuilder sb = new StringBuilder(); | ||
| 411 | int mod = getModifiers() & Modifier.constructorModifiers(); | ||
| 412 | if (mod != 0) { | ||
| 413 | sb.append(Modifier.toString(mod) + " "); | ||
| 414 | } | ||
| 415 | TypeVariable<?>[] typeparms = getTypeParameters(); | ||
| 416 | if (typeparms.length > 0) { | ||
| 417 | boolean first = true; | ||
| 418 | sb.append("<"); | ||
| 419 | for(TypeVariable<?> typeparm: typeparms) { | ||
| 420 | if (!first) | ||
| 421 | sb.append(","); | ||
| 422 | // Class objects can't occur here; no need to test | ||
| 423 | // and call Class.getName(). | ||
| 424 | sb.append(typeparm.toString()); | ||
| 425 | first = false; | ||
| 426 | } | ||
| 427 | sb.append("> "); | ||
| 428 | } | ||
| 429 | sb.append(Field.getTypeName(getDeclaringClass())); | ||
| 430 | sb.append("("); | ||
| 431 | Type[] params = getGenericParameterTypes(); | ||
| 432 | for (int j = 0; j < params.length; j++) { | ||
| 433 | String param = (params[j] instanceof Class<?>)? | ||
| 434 | Field.getTypeName((Class<?>)params[j]): | ||
| 435 | (params[j].toString()); | ||
| 436 | if (isVarArgs() && (j == params.length - 1)) // replace T[] with T... | ||
| 437 | param = param.replaceFirst("\\[\\]$", "..."); | ||
| 438 | sb.append(param); | ||
| 439 | if (j < (params.length - 1)) | ||
| 440 | sb.append(","); | ||
| 441 | } | ||
| 442 | sb.append(")"); | ||
| 443 | Type[] exceptions = getGenericExceptionTypes(); | ||
| 444 | if (exceptions.length > 0) { | ||
| 445 | sb.append(" throws "); | ||
| 446 | for (int k = 0; k < exceptions.length; k++) { | ||
| 447 | sb.append((exceptions[k] instanceof Class)? | ||
| 448 | ((Class<?>)exceptions[k]).getName(): | ||
| 449 | exceptions[k].toString()); | ||
| 450 | if (k < (exceptions.length - 1)) | ||
| 451 | sb.append(","); | ||
| 452 | } | ||
| 453 | } | ||
| 454 | return sb.toString(); | ||
| 455 | } catch (Exception e) { | ||
| 456 | return "<" + e + ">"; | ||
| 457 | } | ||
| 458 | } | ||
| 459 | |||
| 460 | /** | ||
| 461 | * Uses the constructor represented by this {@code Constructor} object to | ||
| 462 | * create and initialize a new instance of the constructor's | ||
| 463 | * declaring class, with the specified initialization parameters. | ||
| 464 | * Individual parameters are automatically unwrapped to match | ||
| 465 | * primitive formal parameters, and both primitive and reference | ||
| 466 | * parameters are subject to method invocation conversions as necessary. | ||
| 467 | * | ||
| 468 | * <p>If the number of formal parameters required by the underlying constructor | ||
| 469 | * is 0, the supplied {@code initargs} array may be of length 0 or null. | ||
| 470 | * | ||
| 471 | * <p>If the constructor's declaring class is an inner class in a | ||
| 472 | * non-static context, the first argument to the constructor needs | ||
| 473 | * to be the enclosing instance; see section 15.9.3 of | ||
| 474 | * <cite>The Java™ Language Specification</cite>. | ||
| 475 | * | ||
| 476 | * <p>If the required access and argument checks succeed and the | ||
| 477 | * instantiation will proceed, the constructor's declaring class | ||
| 478 | * is initialized if it has not already been initialized. | ||
| 479 | * | ||
| 480 | * <p>If the constructor completes normally, returns the newly | ||
| 481 | * created and initialized instance. | ||
| 482 | * | ||
| 483 | * @param initargs array of objects to be passed as arguments to | ||
| 484 | * the constructor call; values of primitive types are wrapped in | ||
| 485 | * a wrapper object of the appropriate type (e.g. a {@code float} | ||
| 486 | * in a {@link java.lang.Float Float}) | ||
| 487 | * | ||
| 488 | * @return a new object created by calling the constructor | ||
| 489 | * this object represents | ||
| 490 | * | ||
| 491 | * @exception IllegalAccessException if this {@code Constructor} object | ||
| 492 | * is enforcing Java language access control and the underlying | ||
| 493 | * constructor is inaccessible. | ||
| 494 | * @exception IllegalArgumentException if the number of actual | ||
| 495 | * and formal parameters differ; if an unwrapping | ||
| 496 | * conversion for primitive arguments fails; or if, | ||
| 497 | * after possible unwrapping, a parameter value | ||
| 498 | * cannot be converted to the corresponding formal | ||
| 499 | * parameter type by a method invocation conversion; if | ||
| 500 | * this constructor pertains to an enum type. | ||
| 501 | * @exception InstantiationException if the class that declares the | ||
| 502 | * underlying constructor represents an abstract class. | ||
| 503 | * @exception InvocationTargetException if the underlying constructor | ||
| 504 | * throws an exception. | ||
| 505 | * @exception ExceptionInInitializerError if the initialization provoked | ||
| 506 | * by this method fails. | ||
| 507 | */ | ||
| 508 | public T newInstance(Object ... initargs) | ||
| 509 | throws InstantiationException, IllegalAccessException, | ||
| 510 | IllegalArgumentException, InvocationTargetException | ||
| 511 | { | ||
| 512 | if (!override) { | ||
| 513 | if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { | ||
| 514 | Class<?> caller = Reflection.getCallerClass(2); | ||
| 515 | |||
| 516 | checkAccess(caller, clazz, null, modifiers); | ||
| 517 | } | ||
| 518 | } | ||
| 519 | if ((clazz.getModifiers() & Modifier.ENUM) != 0) | ||
| 520 | throw new IllegalArgumentException("Cannot reflectively create enum objects"); | ||
| 521 | ConstructorAccessor ca = constructorAccessor; // read volatile | ||
| 522 | if (ca == null) { | ||
| 523 | ca = acquireConstructorAccessor(); | ||
| 524 | } | ||
| 525 | return (T) ca.newInstance(initargs); | ||
| 526 | } | ||
| 527 | |||
| 528 | /** | ||
| 529 | * Returns {@code true} if this constructor was declared to take | ||
| 530 | * a variable number of arguments; returns {@code false} | ||
| 531 | * otherwise. | ||
| 532 | * | ||
| 533 | * @return {@code true} if an only if this constructor was declared to | ||
| 534 | * take a variable number of arguments. | ||
| 535 | * @since 1.5 | ||
| 536 | */ | ||
| 537 | public boolean isVarArgs() { | ||
| 538 | return (getModifiers() & Modifier.VARARGS) != 0; | ||
| 539 | } | ||
| 540 | |||
| 541 | /** | ||
| 542 | * Returns {@code true} if this constructor is a synthetic | ||
| 543 | * constructor; returns {@code false} otherwise. | ||
| 544 | * | ||
| 545 | * @return true if and only if this constructor is a synthetic | ||
| 546 | * constructor as defined by | ||
| 547 | * <cite>The Java™ Language Specification</cite>. | ||
| 548 | * @since 1.5 | ||
| 549 | */ | ||
| 550 | public boolean isSynthetic() { | ||
| 551 | return Modifier.isSynthetic(getModifiers()); | ||
| 552 | } | ||
| 553 | |||
| 554 | // NOTE that there is no synchronization used here. It is correct | ||
| 555 | // (though not efficient) to generate more than one | ||
| 556 | // ConstructorAccessor for a given Constructor. However, avoiding | ||
| 557 | // synchronization will probably make the implementation more | ||
| 558 | // scalable. | ||
| 559 | private ConstructorAccessor acquireConstructorAccessor() { | ||
| 560 | // First check to see if one has been created yet, and take it | ||
| 561 | // if so. | ||
| 562 | ConstructorAccessor tmp = null; | ||
| 563 | if (root != null) tmp = root.getConstructorAccessor(); | ||
| 564 | if (tmp != null) { | ||
| 565 | constructorAccessor = tmp; | ||
| 566 | } else { | ||
| 567 | // Otherwise fabricate one and propagate it up to the root | ||
| 568 | tmp = reflectionFactory.newConstructorAccessor(this); | ||
| 569 | setConstructorAccessor(tmp); | ||
| 570 | } | ||
| 571 | |||
| 572 | return tmp; | ||
| 573 | } | ||
| 574 | |||
| 575 | // Returns ConstructorAccessor for this Constructor object, not | ||
| 576 | // looking up the chain to the root | ||
| 577 | ConstructorAccessor getConstructorAccessor() { | ||
| 578 | return constructorAccessor; | ||
| 579 | } | ||
| 580 | |||
| 581 | // Sets the ConstructorAccessor for this Constructor object and | ||
| 582 | // (recursively) its root | ||
| 583 | void setConstructorAccessor(ConstructorAccessor accessor) { | ||
| 584 | constructorAccessor = accessor; | ||
| 585 | // Propagate up | ||
| 586 | if (root != null) { | ||
| 587 | root.setConstructorAccessor(accessor); | ||
| 588 | } | ||
| 589 | } | ||
| 590 | |||
| 591 | int getSlot() { | ||
| 592 | return slot; | ||
| 593 | } | ||
| 594 | |||
| 595 | String getSignature() { | ||
| 596 | return signature; | ||
| 597 | } | ||
| 598 | |||
| 599 | byte[] getRawAnnotations() { | ||
| 600 | return annotations; | ||
| 601 | } | ||
| 602 | |||
| 603 | byte[] getRawParameterAnnotations() { | ||
| 604 | return parameterAnnotations; | ||
| 605 | } | ||
| 606 | |||
| 607 | /** | ||
| 608 | * @throws NullPointerException {@inheritDoc} | ||
| 609 | * @since 1.5 | ||
| 610 | */ | ||
| 611 | public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { | ||
| 612 | if (annotationClass == null) | ||
| 613 | throw new NullPointerException(); | ||
| 614 | |||
| 615 | return (T) declaredAnnotations().get(annotationClass); | ||
| 616 | } | ||
| 617 | |||
| 618 | /** | ||
| 619 | * @since 1.5 | ||
| 620 | */ | ||
| 621 | public Annotation[] getDeclaredAnnotations() { | ||
| 622 | return AnnotationParser.toArray(declaredAnnotations()); | ||
| 623 | } | ||
| 624 | |||
| 625 | private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations; | ||
| 626 | |||
| 627 | private synchronized Map<Class<? extends Annotation>, Annotation> declaredAnnotations() { | ||
| 628 | if (declaredAnnotations == null) { | ||
| 629 | declaredAnnotations = AnnotationParser.parseAnnotations( | ||
| 630 | annotations, sun.misc.SharedSecrets.getJavaLangAccess(). | ||
| 631 | getConstantPool(getDeclaringClass()), | ||
| 632 | getDeclaringClass()); | ||
| 633 | } | ||
| 634 | return declaredAnnotations; | ||
| 635 | } | ||
| 636 | |||
| 637 | /** | ||
| 638 | * Returns an array of arrays that represent the annotations on the formal | ||
| 639 | * parameters, in declaration order, of the method represented by | ||
| 640 | * this {@code Constructor} object. (Returns an array of length zero if the | ||
| 641 | * underlying method is parameterless. If the method has one or more | ||
| 642 | * parameters, a nested array of length zero is returned for each parameter | ||
| 643 | * with no annotations.) The annotation objects contained in the returned | ||
| 644 | * arrays are serializable. The caller of this method is free to modify | ||
| 645 | * the returned arrays; it will have no effect on the arrays returned to | ||
| 646 | * other callers. | ||
| 647 | * | ||
| 648 | * @return an array of arrays that represent the annotations on the formal | ||
| 649 | * parameters, in declaration order, of the method represented by this | ||
| 650 | * Constructor object | ||
| 651 | * @since 1.5 | ||
| 652 | */ | ||
| 653 | public Annotation[][] getParameterAnnotations() { | ||
| 654 | int numParameters = parameterTypes.length; | ||
| 655 | if (parameterAnnotations == null) | ||
| 656 | return new Annotation[numParameters][0]; | ||
| 657 | |||
| 658 | Annotation[][] result = AnnotationParser.parseParameterAnnotations( | ||
| 659 | parameterAnnotations, | ||
| 660 | sun.misc.SharedSecrets.getJavaLangAccess(). | ||
| 661 | getConstantPool(getDeclaringClass()), | ||
| 662 | getDeclaringClass()); | ||
| 663 | if (result.length != numParameters) { | ||
| 664 | Class<?> declaringClass = getDeclaringClass(); | ||
| 665 | if (declaringClass.isEnum() || | ||
| 666 | declaringClass.isAnonymousClass() || | ||
| 667 | declaringClass.isLocalClass() ) | ||
| 668 | ; // Can't do reliable parameter counting | ||
| 669 | else { | ||
| 670 | if (!declaringClass.isMemberClass() || // top-level | ||
| 671 | // Check for the enclosing instance parameter for | ||
| 672 | // non-static member classes | ||
| 673 | (declaringClass.isMemberClass() && | ||
| 674 | ((declaringClass.getModifiers() & Modifier.STATIC) == 0) && | ||
| 675 | result.length + 1 != numParameters) ) { | ||
| 676 | throw new AnnotationFormatError( | ||
| 677 | "Parameter annotations don't match number of parameters"); | ||
| 678 | } | ||
| 679 | } | ||
| 680 | } | ||
| 681 | return result; | ||
| 682 | } | ||
| 683 | } | ||