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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 | +} | |