001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.lang3; 018 019import java.lang.reflect.Method; 020import java.lang.reflect.Modifier; 021import java.util.ArrayList; 022import java.util.Collections; 023import java.util.HashMap; 024import java.util.HashSet; 025import java.util.Iterator; 026import java.util.LinkedHashSet; 027import java.util.List; 028import java.util.Map; 029import java.util.Set; 030 031import org.apache.commons.lang3.mutable.MutableObject; 032 033/** 034 * <p>Operates on classes without using reflection.</p> 035 * 036 * <p>This class handles invalid {@code null} inputs as best it can. 037 * Each method documents its behaviour in more detail.</p> 038 * 039 * <p>The notion of a {@code canonical name} includes the human 040 * readable name for the type, for example {@code int[]}. The 041 * non-canonical method variants work with the JVM names, such as 042 * {@code [I}. </p> 043 * 044 * @since 2.0 045 */ 046public class ClassUtils { 047 /** 048 * Inclusivity literals for {@link #hierarchy(Class, Interfaces)}. 049 * @since 3.2 050 */ 051 public enum Interfaces { 052 INCLUDE, EXCLUDE 053 } 054 055 /** 056 * The package separator character: <code>'.' == {@value}</code>. 057 */ 058 public static final char PACKAGE_SEPARATOR_CHAR = '.'; 059 060 /** 061 * The package separator String: <code>"."</code>. 062 */ 063 public static final String PACKAGE_SEPARATOR = String.valueOf(PACKAGE_SEPARATOR_CHAR); 064 065 /** 066 * The inner class separator character: <code>'$' == {@value}</code>. 067 */ 068 public static final char INNER_CLASS_SEPARATOR_CHAR = '$'; 069 070 /** 071 * The inner class separator String: {@code "$"}. 072 */ 073 public static final String INNER_CLASS_SEPARATOR = String.valueOf(INNER_CLASS_SEPARATOR_CHAR); 074 075 /** 076 * Maps names of primitives to their corresponding primitive {@code Class}es. 077 */ 078 private static final Map<String, Class<?>> namePrimitiveMap = new HashMap<String, Class<?>>(); 079 static { 080 namePrimitiveMap.put("boolean", Boolean.TYPE); 081 namePrimitiveMap.put("byte", Byte.TYPE); 082 namePrimitiveMap.put("char", Character.TYPE); 083 namePrimitiveMap.put("short", Short.TYPE); 084 namePrimitiveMap.put("int", Integer.TYPE); 085 namePrimitiveMap.put("long", Long.TYPE); 086 namePrimitiveMap.put("double", Double.TYPE); 087 namePrimitiveMap.put("float", Float.TYPE); 088 namePrimitiveMap.put("void", Void.TYPE); 089 } 090 091 /** 092 * Maps primitive {@code Class}es to their corresponding wrapper {@code Class}. 093 */ 094 private static final Map<Class<?>, Class<?>> primitiveWrapperMap = new HashMap<Class<?>, Class<?>>(); 095 static { 096 primitiveWrapperMap.put(Boolean.TYPE, Boolean.class); 097 primitiveWrapperMap.put(Byte.TYPE, Byte.class); 098 primitiveWrapperMap.put(Character.TYPE, Character.class); 099 primitiveWrapperMap.put(Short.TYPE, Short.class); 100 primitiveWrapperMap.put(Integer.TYPE, Integer.class); 101 primitiveWrapperMap.put(Long.TYPE, Long.class); 102 primitiveWrapperMap.put(Double.TYPE, Double.class); 103 primitiveWrapperMap.put(Float.TYPE, Float.class); 104 primitiveWrapperMap.put(Void.TYPE, Void.TYPE); 105 } 106 107 /** 108 * Maps wrapper {@code Class}es to their corresponding primitive types. 109 */ 110 private static final Map<Class<?>, Class<?>> wrapperPrimitiveMap = new HashMap<Class<?>, Class<?>>(); 111 static { 112 for (final Map.Entry<Class<?>, Class<?>> entry : primitiveWrapperMap.entrySet()) { 113 final Class<?> primitiveClass = entry.getKey(); 114 final Class<?> wrapperClass = entry.getValue(); 115 if (!primitiveClass.equals(wrapperClass)) { 116 wrapperPrimitiveMap.put(wrapperClass, primitiveClass); 117 } 118 } 119 } 120 121 /** 122 * Maps a primitive class name to its corresponding abbreviation used in array class names. 123 */ 124 private static final Map<String, String> abbreviationMap; 125 126 /** 127 * Maps an abbreviation used in array class names to corresponding primitive class name. 128 */ 129 private static final Map<String, String> reverseAbbreviationMap; 130 131 /** 132 * Feed abbreviation maps 133 */ 134 static { 135 final Map<String, String> m = new HashMap<String, String>(); 136 m.put("int", "I"); 137 m.put("boolean", "Z"); 138 m.put("float", "F"); 139 m.put("long", "J"); 140 m.put("short", "S"); 141 m.put("byte", "B"); 142 m.put("double", "D"); 143 m.put("char", "C"); 144 final Map<String, String> r = new HashMap<String, String>(); 145 for (final Map.Entry<String, String> e : m.entrySet()) { 146 r.put(e.getValue(), e.getKey()); 147 } 148 abbreviationMap = Collections.unmodifiableMap(m); 149 reverseAbbreviationMap = Collections.unmodifiableMap(r); 150 } 151 152 /** 153 * <p>ClassUtils instances should NOT be constructed in standard programming. 154 * Instead, the class should be used as 155 * {@code ClassUtils.getShortClassName(cls)}.</p> 156 * 157 * <p>This constructor is public to permit tools that require a JavaBean 158 * instance to operate.</p> 159 */ 160 public ClassUtils() { 161 super(); 162 } 163 164 // Short class name 165 // ---------------------------------------------------------------------- 166 /** 167 * <p>Gets the class name minus the package name for an {@code Object}.</p> 168 * 169 * @param object the class to get the short name for, may be null 170 * @param valueIfNull the value to return if null 171 * @return the class name of the object without the package name, or the null value 172 */ 173 public static String getShortClassName(final Object object, final String valueIfNull) { 174 if (object == null) { 175 return valueIfNull; 176 } 177 return getShortClassName(object.getClass()); 178 } 179 180 /** 181 * <p>Gets the class name minus the package name from a {@code Class}.</p> 182 * 183 * <p>Consider using the Java 5 API {@link Class#getSimpleName()} instead. 184 * The one known difference is that this code will return {@code "Map.Entry"} while 185 * the {@code java.lang.Class} variant will simply return {@code "Entry"}. </p> 186 * 187 * @param cls the class to get the short name for. 188 * @return the class name without the package name or an empty string 189 */ 190 public static String getShortClassName(final Class<?> cls) { 191 if (cls == null) { 192 return StringUtils.EMPTY; 193 } 194 return getShortClassName(cls.getName()); 195 } 196 197 /** 198 * <p>Gets the class name minus the package name from a String.</p> 199 * 200 * <p>The string passed in is assumed to be a class name - it is not checked.</p> 201 202 * <p>Note that this method differs from Class.getSimpleName() in that this will 203 * return {@code "Map.Entry"} whilst the {@code java.lang.Class} variant will simply 204 * return {@code "Entry"}. </p> 205 * 206 * @param className the className to get the short name for 207 * @return the class name of the class without the package name or an empty string 208 */ 209 public static String getShortClassName(String className) { 210 if (StringUtils.isEmpty(className)) { 211 return StringUtils.EMPTY; 212 } 213 214 final StringBuilder arrayPrefix = new StringBuilder(); 215 216 // Handle array encoding 217 if (className.startsWith("[")) { 218 while (className.charAt(0) == '[') { 219 className = className.substring(1); 220 arrayPrefix.append("[]"); 221 } 222 // Strip Object type encoding 223 if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') { 224 className = className.substring(1, className.length() - 1); 225 } 226 227 if (reverseAbbreviationMap.containsKey(className)) { 228 className = reverseAbbreviationMap.get(className); 229 } 230 } 231 232 final int lastDotIdx = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR); 233 final int innerIdx = className.indexOf( 234 INNER_CLASS_SEPARATOR_CHAR, lastDotIdx == -1 ? 0 : lastDotIdx + 1); 235 String out = className.substring(lastDotIdx + 1); 236 if (innerIdx != -1) { 237 out = out.replace(INNER_CLASS_SEPARATOR_CHAR, PACKAGE_SEPARATOR_CHAR); 238 } 239 return out + arrayPrefix; 240 } 241 242 /** 243 * <p>Null-safe version of <code>aClass.getSimpleName()</code></p> 244 * 245 * @param cls the class for which to get the simple name. 246 * @return the simple class name. 247 * @since 3.0 248 * @see Class#getSimpleName() 249 */ 250 public static String getSimpleName(final Class<?> cls) { 251 if (cls == null) { 252 return StringUtils.EMPTY; 253 } 254 return cls.getSimpleName(); 255 } 256 257 /** 258 * <p>Null-safe version of <code>aClass.getSimpleName()</code></p> 259 * 260 * @param object the object for which to get the simple class name. 261 * @param valueIfNull the value to return if <code>object</code> is <code>null</code> 262 * @return the simple class name. 263 * @since 3.0 264 * @see Class#getSimpleName() 265 */ 266 public static String getSimpleName(final Object object, final String valueIfNull) { 267 if (object == null) { 268 return valueIfNull; 269 } 270 return getSimpleName(object.getClass()); 271 } 272 273 // Package name 274 // ---------------------------------------------------------------------- 275 /** 276 * <p>Gets the package name of an {@code Object}.</p> 277 * 278 * @param object the class to get the package name for, may be null 279 * @param valueIfNull the value to return if null 280 * @return the package name of the object, or the null value 281 */ 282 public static String getPackageName(final Object object, final String valueIfNull) { 283 if (object == null) { 284 return valueIfNull; 285 } 286 return getPackageName(object.getClass()); 287 } 288 289 /** 290 * <p>Gets the package name of a {@code Class}.</p> 291 * 292 * @param cls the class to get the package name for, may be {@code null}. 293 * @return the package name or an empty string 294 */ 295 public static String getPackageName(final Class<?> cls) { 296 if (cls == null) { 297 return StringUtils.EMPTY; 298 } 299 return getPackageName(cls.getName()); 300 } 301 302 /** 303 * <p>Gets the package name from a {@code String}.</p> 304 * 305 * <p>The string passed in is assumed to be a class name - it is not checked.</p> 306 * <p>If the class is unpackaged, return an empty string.</p> 307 * 308 * @param className the className to get the package name for, may be {@code null} 309 * @return the package name or an empty string 310 */ 311 public static String getPackageName(String className) { 312 if (StringUtils.isEmpty(className)) { 313 return StringUtils.EMPTY; 314 } 315 316 // Strip array encoding 317 while (className.charAt(0) == '[') { 318 className = className.substring(1); 319 } 320 // Strip Object type encoding 321 if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') { 322 className = className.substring(1); 323 } 324 325 final int i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR); 326 if (i == -1) { 327 return StringUtils.EMPTY; 328 } 329 return className.substring(0, i); 330 } 331 332 // Abbreviated name 333 // ---------------------------------------------------------------------- 334 /** 335 * <p>Gets the abbreviated name of a {@code Class}.</p> 336 * 337 * @param cls the class to get the abbreviated name for, may be {@code null} 338 * @param len the desired length of the abbreviated name 339 * @return the abbreviated name or an empty string 340 * @throws IllegalArgumentException if len <= 0 341 * @see #getAbbreviatedName(String, int) 342 * @since 3.4 343 */ 344 public static String getAbbreviatedName(final Class<?> cls, int len) { 345 if (cls == null) { 346 return StringUtils.EMPTY; 347 } 348 return getAbbreviatedName(cls.getName(), len); 349 } 350 351 /** 352 * <p>Gets the abbreviated class name from a {@code String}.</p> 353 * 354 * <p>The string passed in is assumed to be a class name - it is not checked.</p> 355 * 356 * <p>The abbreviation algorithm will shorten the class name, usually without 357 * significant loss of meaning.</p> 358 * <p>The abbreviated class name will always include the complete package hierarchy. 359 * If enough space is available, rightmost sub-packages will be displayed in full 360 * length.</p> 361 * 362 * <p>The following table illustrates the algorithm:</p> 363 * <table summary="abbreviation examples"> 364 * <tr><td>className</td><td>len</td><td>return</td></tr> 365 * <tr><td> null</td><td> 1</td><td>""</td></tr> 366 * <tr><td>"java.lang.String"</td><td> 5</td><td>"j.l.String"</td></tr> 367 * <tr><td>"java.lang.String"</td><td>15</td><td>"j.lang.String"</td></tr> 368 * <tr><td>"java.lang.String"</td><td>30</td><td>"java.lang.String"</td></tr> 369 * </table> 370 * @param className the className to get the abbreviated name for, may be {@code null} 371 * @param len the desired length of the abbreviated name 372 * @return the abbreviated name or an empty string 373 * @throws IllegalArgumentException if len <= 0 374 * @since 3.4 375 */ 376 public static String getAbbreviatedName(String className, int len) { 377 if (len <= 0) { 378 throw new IllegalArgumentException("len must be > 0"); 379 } 380 if (className == null) { 381 return StringUtils.EMPTY; 382 } 383 384 int availableSpace = len; 385 int packageLevels = StringUtils.countMatches(className, '.'); 386 String[] output = new String[packageLevels + 1]; 387 int endIndex = className.length() - 1; 388 for (int level = packageLevels; level >= 0; level--) { 389 int startIndex = className.lastIndexOf('.', endIndex); 390 String part = className.substring(startIndex + 1, endIndex + 1); 391 availableSpace -= part.length(); 392 if (level > 0) { 393 // all elements except top level require an additional char space 394 availableSpace--; 395 } 396 if (level == packageLevels) { 397 // ClassName is always complete 398 output[level] = part; 399 } else { 400 if (availableSpace > 0) { 401 output[level] = part; 402 } else { 403 // if no space is left still the first char is used 404 output[level] = part.substring(0, 1); 405 } 406 } 407 endIndex = startIndex - 1; 408 } 409 410 return StringUtils.join(output, '.'); 411 } 412 413 // Superclasses/Superinterfaces 414 // ---------------------------------------------------------------------- 415 /** 416 * <p>Gets a {@code List} of superclasses for the given class.</p> 417 * 418 * @param cls the class to look up, may be {@code null} 419 * @return the {@code List} of superclasses in order going up from this one 420 * {@code null} if null input 421 */ 422 public static List<Class<?>> getAllSuperclasses(final Class<?> cls) { 423 if (cls == null) { 424 return null; 425 } 426 final List<Class<?>> classes = new ArrayList<Class<?>>(); 427 Class<?> superclass = cls.getSuperclass(); 428 while (superclass != null) { 429 classes.add(superclass); 430 superclass = superclass.getSuperclass(); 431 } 432 return classes; 433 } 434 435 /** 436 * <p>Gets a {@code List} of all interfaces implemented by the given 437 * class and its superclasses.</p> 438 * 439 * <p>The order is determined by looking through each interface in turn as 440 * declared in the source file and following its hierarchy up. Then each 441 * superclass is considered in the same way. Later duplicates are ignored, 442 * so the order is maintained.</p> 443 * 444 * @param cls the class to look up, may be {@code null} 445 * @return the {@code List} of interfaces in order, 446 * {@code null} if null input 447 */ 448 public static List<Class<?>> getAllInterfaces(final Class<?> cls) { 449 if (cls == null) { 450 return null; 451 } 452 453 final LinkedHashSet<Class<?>> interfacesFound = new LinkedHashSet<Class<?>>(); 454 getAllInterfaces(cls, interfacesFound); 455 456 return new ArrayList<Class<?>>(interfacesFound); 457 } 458 459 /** 460 * Get the interfaces for the specified class. 461 * 462 * @param cls the class to look up, may be {@code null} 463 * @param interfacesFound the {@code Set} of interfaces for the class 464 */ 465 private static void getAllInterfaces(Class<?> cls, final HashSet<Class<?>> interfacesFound) { 466 while (cls != null) { 467 final Class<?>[] interfaces = cls.getInterfaces(); 468 469 for (final Class<?> i : interfaces) { 470 if (interfacesFound.add(i)) { 471 getAllInterfaces(i, interfacesFound); 472 } 473 } 474 475 cls = cls.getSuperclass(); 476 } 477 } 478 479 // Convert list 480 // ---------------------------------------------------------------------- 481 /** 482 * <p>Given a {@code List} of class names, this method converts them into classes.</p> 483 * 484 * <p>A new {@code List} is returned. If the class name cannot be found, {@code null} 485 * is stored in the {@code List}. If the class name in the {@code List} is 486 * {@code null}, {@code null} is stored in the output {@code List}.</p> 487 * 488 * @param classNames the classNames to change 489 * @return a {@code List} of Class objects corresponding to the class names, 490 * {@code null} if null input 491 * @throws ClassCastException if classNames contains a non String entry 492 */ 493 public static List<Class<?>> convertClassNamesToClasses(final List<String> classNames) { 494 if (classNames == null) { 495 return null; 496 } 497 final List<Class<?>> classes = new ArrayList<Class<?>>(classNames.size()); 498 for (final String className : classNames) { 499 try { 500 classes.add(Class.forName(className)); 501 } catch (final Exception ex) { 502 classes.add(null); 503 } 504 } 505 return classes; 506 } 507 508 /** 509 * <p>Given a {@code List} of {@code Class} objects, this method converts 510 * them into class names.</p> 511 * 512 * <p>A new {@code List} is returned. {@code null} objects will be copied into 513 * the returned list as {@code null}.</p> 514 * 515 * @param classes the classes to change 516 * @return a {@code List} of class names corresponding to the Class objects, 517 * {@code null} if null input 518 * @throws ClassCastException if {@code classes} contains a non-{@code Class} entry 519 */ 520 public static List<String> convertClassesToClassNames(final List<Class<?>> classes) { 521 if (classes == null) { 522 return null; 523 } 524 final List<String> classNames = new ArrayList<String>(classes.size()); 525 for (final Class<?> cls : classes) { 526 if (cls == null) { 527 classNames.add(null); 528 } else { 529 classNames.add(cls.getName()); 530 } 531 } 532 return classNames; 533 } 534 535 // Is assignable 536 // ---------------------------------------------------------------------- 537 /** 538 * <p>Checks if an array of Classes can be assigned to another array of Classes.</p> 539 * 540 * <p>This method calls {@link #isAssignable(Class, Class) isAssignable} for each 541 * Class pair in the input arrays. It can be used to check if a set of arguments 542 * (the first parameter) are suitably compatible with a set of method parameter types 543 * (the second parameter).</p> 544 * 545 * <p>Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this 546 * method takes into account widenings of primitive classes and 547 * {@code null}s.</p> 548 * 549 * <p>Primitive widenings allow an int to be assigned to a {@code long}, 550 * {@code float} or {@code double}. This method returns the correct 551 * result for these cases.</p> 552 * 553 * <p>{@code Null} may be assigned to any reference type. This method will 554 * return {@code true} if {@code null} is passed in and the toClass is 555 * non-primitive.</p> 556 * 557 * <p>Specifically, this method tests whether the type represented by the 558 * specified {@code Class} parameter can be converted to the type 559 * represented by this {@code Class} object via an identity conversion 560 * widening primitive or widening reference conversion. See 561 * <em><a href="http://docs.oracle.com/javase/specs/">The Java Language Specification</a></em>, 562 * sections 5.1.1, 5.1.2 and 5.1.4 for details.</p> 563 * 564 * <p><strong>Since Lang 3.0,</strong> this method will default behavior for 565 * calculating assignability between primitive and wrapper types <em>corresponding 566 * to the running Java version</em>; i.e. autoboxing will be the default 567 * behavior in VMs running Java versions > 1.5.</p> 568 * 569 * @param classArray the array of Classes to check, may be {@code null} 570 * @param toClassArray the array of Classes to try to assign into, may be {@code null} 571 * @return {@code true} if assignment possible 572 */ 573 public static boolean isAssignable(final Class<?>[] classArray, final Class<?>... toClassArray) { 574 return isAssignable(classArray, toClassArray, SystemUtils.isJavaVersionAtLeast(JavaVersion.JAVA_1_5)); 575 } 576 577 /** 578 * <p>Checks if an array of Classes can be assigned to another array of Classes.</p> 579 * 580 * <p>This method calls {@link #isAssignable(Class, Class) isAssignable} for each 581 * Class pair in the input arrays. It can be used to check if a set of arguments 582 * (the first parameter) are suitably compatible with a set of method parameter types 583 * (the second parameter).</p> 584 * 585 * <p>Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this 586 * method takes into account widenings of primitive classes and 587 * {@code null}s.</p> 588 * 589 * <p>Primitive widenings allow an int to be assigned to a {@code long}, 590 * {@code float} or {@code double}. This method returns the correct 591 * result for these cases.</p> 592 * 593 * <p>{@code Null} may be assigned to any reference type. This method will 594 * return {@code true} if {@code null} is passed in and the toClass is 595 * non-primitive.</p> 596 * 597 * <p>Specifically, this method tests whether the type represented by the 598 * specified {@code Class} parameter can be converted to the type 599 * represented by this {@code Class} object via an identity conversion 600 * widening primitive or widening reference conversion. See 601 * <em><a href="http://docs.oracle.com/javase/specs/">The Java Language Specification</a></em>, 602 * sections 5.1.1, 5.1.2 and 5.1.4 for details.</p> 603 * 604 * @param classArray the array of Classes to check, may be {@code null} 605 * @param toClassArray the array of Classes to try to assign into, may be {@code null} 606 * @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers 607 * @return {@code true} if assignment possible 608 */ 609 public static boolean isAssignable(Class<?>[] classArray, Class<?>[] toClassArray, final boolean autoboxing) { 610 if (ArrayUtils.isSameLength(classArray, toClassArray) == false) { 611 return false; 612 } 613 if (classArray == null) { 614 classArray = ArrayUtils.EMPTY_CLASS_ARRAY; 615 } 616 if (toClassArray == null) { 617 toClassArray = ArrayUtils.EMPTY_CLASS_ARRAY; 618 } 619 for (int i = 0; i < classArray.length; i++) { 620 if (isAssignable(classArray[i], toClassArray[i], autoboxing) == false) { 621 return false; 622 } 623 } 624 return true; 625 } 626 627 /** 628 * Returns whether the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character}, 629 * {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}). 630 * 631 * @param type 632 * The class to query or null. 633 * @return true if the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character}, 634 * {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}). 635 * @since 3.1 636 */ 637 public static boolean isPrimitiveOrWrapper(final Class<?> type) { 638 if (type == null) { 639 return false; 640 } 641 return type.isPrimitive() || isPrimitiveWrapper(type); 642 } 643 644 /** 645 * Returns whether the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character}, {@link Short}, 646 * {@link Integer}, {@link Long}, {@link Double}, {@link Float}). 647 * 648 * @param type 649 * The class to query or null. 650 * @return true if the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character}, {@link Short}, 651 * {@link Integer}, {@link Long}, {@link Double}, {@link Float}). 652 * @since 3.1 653 */ 654 public static boolean isPrimitiveWrapper(final Class<?> type) { 655 return wrapperPrimitiveMap.containsKey(type); 656 } 657 658 /** 659 * <p>Checks if one {@code Class} can be assigned to a variable of 660 * another {@code Class}.</p> 661 * 662 * <p>Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, 663 * this method takes into account widenings of primitive classes and 664 * {@code null}s.</p> 665 * 666 * <p>Primitive widenings allow an int to be assigned to a long, float or 667 * double. This method returns the correct result for these cases.</p> 668 * 669 * <p>{@code Null} may be assigned to any reference type. This method 670 * will return {@code true} if {@code null} is passed in and the 671 * toClass is non-primitive.</p> 672 * 673 * <p>Specifically, this method tests whether the type represented by the 674 * specified {@code Class} parameter can be converted to the type 675 * represented by this {@code Class} object via an identity conversion 676 * widening primitive or widening reference conversion. See 677 * <em><a href="http://docs.oracle.com/javase/specs/">The Java Language Specification</a></em>, 678 * sections 5.1.1, 5.1.2 and 5.1.4 for details.</p> 679 * 680 * <p><strong>Since Lang 3.0,</strong> this method will default behavior for 681 * calculating assignability between primitive and wrapper types <em>corresponding 682 * to the running Java version</em>; i.e. autoboxing will be the default 683 * behavior in VMs running Java versions > 1.5.</p> 684 * 685 * @param cls the Class to check, may be null 686 * @param toClass the Class to try to assign into, returns false if null 687 * @return {@code true} if assignment possible 688 */ 689 public static boolean isAssignable(final Class<?> cls, final Class<?> toClass) { 690 return isAssignable(cls, toClass, SystemUtils.isJavaVersionAtLeast(JavaVersion.JAVA_1_5)); 691 } 692 693 /** 694 * <p>Checks if one {@code Class} can be assigned to a variable of 695 * another {@code Class}.</p> 696 * 697 * <p>Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, 698 * this method takes into account widenings of primitive classes and 699 * {@code null}s.</p> 700 * 701 * <p>Primitive widenings allow an int to be assigned to a long, float or 702 * double. This method returns the correct result for these cases.</p> 703 * 704 * <p>{@code Null} may be assigned to any reference type. This method 705 * will return {@code true} if {@code null} is passed in and the 706 * toClass is non-primitive.</p> 707 * 708 * <p>Specifically, this method tests whether the type represented by the 709 * specified {@code Class} parameter can be converted to the type 710 * represented by this {@code Class} object via an identity conversion 711 * widening primitive or widening reference conversion. See 712 * <em><a href="http://docs.oracle.com/javase/specs/">The Java Language Specification</a></em>, 713 * sections 5.1.1, 5.1.2 and 5.1.4 for details.</p> 714 * 715 * @param cls the Class to check, may be null 716 * @param toClass the Class to try to assign into, returns false if null 717 * @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers 718 * @return {@code true} if assignment possible 719 */ 720 public static boolean isAssignable(Class<?> cls, final Class<?> toClass, final boolean autoboxing) { 721 if (toClass == null) { 722 return false; 723 } 724 // have to check for null, as isAssignableFrom doesn't 725 if (cls == null) { 726 return !toClass.isPrimitive(); 727 } 728 //autoboxing: 729 if (autoboxing) { 730 if (cls.isPrimitive() && !toClass.isPrimitive()) { 731 cls = primitiveToWrapper(cls); 732 if (cls == null) { 733 return false; 734 } 735 } 736 if (toClass.isPrimitive() && !cls.isPrimitive()) { 737 cls = wrapperToPrimitive(cls); 738 if (cls == null) { 739 return false; 740 } 741 } 742 } 743 if (cls.equals(toClass)) { 744 return true; 745 } 746 if (cls.isPrimitive()) { 747 if (toClass.isPrimitive() == false) { 748 return false; 749 } 750 if (Integer.TYPE.equals(cls)) { 751 return Long.TYPE.equals(toClass) 752 || Float.TYPE.equals(toClass) 753 || Double.TYPE.equals(toClass); 754 } 755 if (Long.TYPE.equals(cls)) { 756 return Float.TYPE.equals(toClass) 757 || Double.TYPE.equals(toClass); 758 } 759 if (Boolean.TYPE.equals(cls)) { 760 return false; 761 } 762 if (Double.TYPE.equals(cls)) { 763 return false; 764 } 765 if (Float.TYPE.equals(cls)) { 766 return Double.TYPE.equals(toClass); 767 } 768 if (Character.TYPE.equals(cls)) { 769 return Integer.TYPE.equals(toClass) 770 || Long.TYPE.equals(toClass) 771 || Float.TYPE.equals(toClass) 772 || Double.TYPE.equals(toClass); 773 } 774 if (Short.TYPE.equals(cls)) { 775 return Integer.TYPE.equals(toClass) 776 || Long.TYPE.equals(toClass) 777 || Float.TYPE.equals(toClass) 778 || Double.TYPE.equals(toClass); 779 } 780 if (Byte.TYPE.equals(cls)) { 781 return Short.TYPE.equals(toClass) 782 || Integer.TYPE.equals(toClass) 783 || Long.TYPE.equals(toClass) 784 || Float.TYPE.equals(toClass) 785 || Double.TYPE.equals(toClass); 786 } 787 // should never get here 788 return false; 789 } 790 return toClass.isAssignableFrom(cls); 791 } 792 793 /** 794 * <p>Converts the specified primitive Class object to its corresponding 795 * wrapper Class object.</p> 796 * 797 * <p>NOTE: From v2.2, this method handles {@code Void.TYPE}, 798 * returning {@code Void.TYPE}.</p> 799 * 800 * @param cls the class to convert, may be null 801 * @return the wrapper class for {@code cls} or {@code cls} if 802 * {@code cls} is not a primitive. {@code null} if null input. 803 * @since 2.1 804 */ 805 public static Class<?> primitiveToWrapper(final Class<?> cls) { 806 Class<?> convertedClass = cls; 807 if (cls != null && cls.isPrimitive()) { 808 convertedClass = primitiveWrapperMap.get(cls); 809 } 810 return convertedClass; 811 } 812 813 /** 814 * <p>Converts the specified array of primitive Class objects to an array of 815 * its corresponding wrapper Class objects.</p> 816 * 817 * @param classes the class array to convert, may be null or empty 818 * @return an array which contains for each given class, the wrapper class or 819 * the original class if class is not a primitive. {@code null} if null input. 820 * Empty array if an empty array passed in. 821 * @since 2.1 822 */ 823 public static Class<?>[] primitivesToWrappers(final Class<?>... classes) { 824 if (classes == null) { 825 return null; 826 } 827 828 if (classes.length == 0) { 829 return classes; 830 } 831 832 final Class<?>[] convertedClasses = new Class[classes.length]; 833 for (int i = 0; i < classes.length; i++) { 834 convertedClasses[i] = primitiveToWrapper(classes[i]); 835 } 836 return convertedClasses; 837 } 838 839 /** 840 * <p>Converts the specified wrapper class to its corresponding primitive 841 * class.</p> 842 * 843 * <p>This method is the counter part of {@code primitiveToWrapper()}. 844 * If the passed in class is a wrapper class for a primitive type, this 845 * primitive type will be returned (e.g. {@code Integer.TYPE} for 846 * {@code Integer.class}). For other classes, or if the parameter is 847 * <b>null</b>, the return value is <b>null</b>.</p> 848 * 849 * @param cls the class to convert, may be <b>null</b> 850 * @return the corresponding primitive type if {@code cls} is a 851 * wrapper class, <b>null</b> otherwise 852 * @see #primitiveToWrapper(Class) 853 * @since 2.4 854 */ 855 public static Class<?> wrapperToPrimitive(final Class<?> cls) { 856 return wrapperPrimitiveMap.get(cls); 857 } 858 859 /** 860 * <p>Converts the specified array of wrapper Class objects to an array of 861 * its corresponding primitive Class objects.</p> 862 * 863 * <p>This method invokes {@code wrapperToPrimitive()} for each element 864 * of the passed in array.</p> 865 * 866 * @param classes the class array to convert, may be null or empty 867 * @return an array which contains for each given class, the primitive class or 868 * <b>null</b> if the original class is not a wrapper class. {@code null} if null input. 869 * Empty array if an empty array passed in. 870 * @see #wrapperToPrimitive(Class) 871 * @since 2.4 872 */ 873 public static Class<?>[] wrappersToPrimitives(final Class<?>... classes) { 874 if (classes == null) { 875 return null; 876 } 877 878 if (classes.length == 0) { 879 return classes; 880 } 881 882 final Class<?>[] convertedClasses = new Class[classes.length]; 883 for (int i = 0; i < classes.length; i++) { 884 convertedClasses[i] = wrapperToPrimitive(classes[i]); 885 } 886 return convertedClasses; 887 } 888 889 // Inner class 890 // ---------------------------------------------------------------------- 891 /** 892 * <p>Is the specified class an inner class or static nested class.</p> 893 * 894 * @param cls the class to check, may be null 895 * @return {@code true} if the class is an inner or static nested class, 896 * false if not or {@code null} 897 */ 898 public static boolean isInnerClass(final Class<?> cls) { 899 return cls != null && cls.getEnclosingClass() != null; 900 } 901 902 // Class loading 903 // ---------------------------------------------------------------------- 904 /** 905 * Returns the class represented by {@code className} using the 906 * {@code classLoader}. This implementation supports the syntaxes 907 * "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}", 908 * "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}". 909 * 910 * @param classLoader the class loader to use to load the class 911 * @param className the class name 912 * @param initialize whether the class must be initialized 913 * @return the class represented by {@code className} using the {@code classLoader} 914 * @throws ClassNotFoundException if the class is not found 915 */ 916 public static Class<?> getClass( 917 final ClassLoader classLoader, final String className, final boolean initialize) throws ClassNotFoundException { 918 try { 919 Class<?> clazz; 920 if (namePrimitiveMap.containsKey(className)) { 921 clazz = namePrimitiveMap.get(className); 922 } else { 923 clazz = Class.forName(toCanonicalName(className), initialize, classLoader); 924 } 925 return clazz; 926 } catch (final ClassNotFoundException ex) { 927 // allow path separators (.) as inner class name separators 928 final int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR); 929 930 if (lastDotIndex != -1) { 931 try { 932 return getClass(classLoader, className.substring(0, lastDotIndex) + 933 INNER_CLASS_SEPARATOR_CHAR + className.substring(lastDotIndex + 1), 934 initialize); 935 } catch (final ClassNotFoundException ex2) { // NOPMD 936 // ignore exception 937 } 938 } 939 940 throw ex; 941 } 942 } 943 944 /** 945 * Returns the (initialized) class represented by {@code className} 946 * using the {@code classLoader}. This implementation supports 947 * the syntaxes "{@code java.util.Map.Entry[]}", 948 * "{@code java.util.Map$Entry[]}", "{@code [Ljava.util.Map.Entry;}", 949 * and "{@code [Ljava.util.Map$Entry;}". 950 * 951 * @param classLoader the class loader to use to load the class 952 * @param className the class name 953 * @return the class represented by {@code className} using the {@code classLoader} 954 * @throws ClassNotFoundException if the class is not found 955 */ 956 public static Class<?> getClass(final ClassLoader classLoader, final String className) throws ClassNotFoundException { 957 return getClass(classLoader, className, true); 958 } 959 960 /** 961 * Returns the (initialized) class represented by {@code className} 962 * using the current thread's context class loader. This implementation 963 * supports the syntaxes "{@code java.util.Map.Entry[]}", 964 * "{@code java.util.Map$Entry[]}", "{@code [Ljava.util.Map.Entry;}", 965 * and "{@code [Ljava.util.Map$Entry;}". 966 * 967 * @param className the class name 968 * @return the class represented by {@code className} using the current thread's context class loader 969 * @throws ClassNotFoundException if the class is not found 970 */ 971 public static Class<?> getClass(final String className) throws ClassNotFoundException { 972 return getClass(className, true); 973 } 974 975 /** 976 * Returns the class represented by {@code className} using the 977 * current thread's context class loader. This implementation supports the 978 * syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}", 979 * "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}". 980 * 981 * @param className the class name 982 * @param initialize whether the class must be initialized 983 * @return the class represented by {@code className} using the current thread's context class loader 984 * @throws ClassNotFoundException if the class is not found 985 */ 986 public static Class<?> getClass(final String className, final boolean initialize) throws ClassNotFoundException { 987 final ClassLoader contextCL = Thread.currentThread().getContextClassLoader(); 988 final ClassLoader loader = contextCL == null ? ClassUtils.class.getClassLoader() : contextCL; 989 return getClass(loader, className, initialize); 990 } 991 992 // Public method 993 // ---------------------------------------------------------------------- 994 /** 995 * <p>Returns the desired Method much like {@code Class.getMethod}, however 996 * it ensures that the returned Method is from a public class or interface and not 997 * from an anonymous inner class. This means that the Method is invokable and 998 * doesn't fall foul of Java bug 999 * <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4071957">4071957</a>).</p> 1000 * 1001 * <pre> 1002 * <code>Set set = Collections.unmodifiableSet(...); 1003 * Method method = ClassUtils.getPublicMethod(set.getClass(), "isEmpty", new Class[0]); 1004 * Object result = method.invoke(set, new Object[]);</code> 1005 * </pre> 1006 * 1007 * @param cls the class to check, not null 1008 * @param methodName the name of the method 1009 * @param parameterTypes the list of parameters 1010 * @return the method 1011 * @throws NullPointerException if the class is null 1012 * @throws SecurityException if a security violation occurred 1013 * @throws NoSuchMethodException if the method is not found in the given class 1014 * or if the method doesn't conform with the requirements 1015 */ 1016 public static Method getPublicMethod(final Class<?> cls, final String methodName, final Class<?>... parameterTypes) 1017 throws SecurityException, NoSuchMethodException { 1018 1019 final Method declaredMethod = cls.getMethod(methodName, parameterTypes); 1020 if (Modifier.isPublic(declaredMethod.getDeclaringClass().getModifiers())) { 1021 return declaredMethod; 1022 } 1023 1024 final List<Class<?>> candidateClasses = new ArrayList<Class<?>>(); 1025 candidateClasses.addAll(getAllInterfaces(cls)); 1026 candidateClasses.addAll(getAllSuperclasses(cls)); 1027 1028 for (final Class<?> candidateClass : candidateClasses) { 1029 if (!Modifier.isPublic(candidateClass.getModifiers())) { 1030 continue; 1031 } 1032 Method candidateMethod; 1033 try { 1034 candidateMethod = candidateClass.getMethod(methodName, parameterTypes); 1035 } catch (final NoSuchMethodException ex) { 1036 continue; 1037 } 1038 if (Modifier.isPublic(candidateMethod.getDeclaringClass().getModifiers())) { 1039 return candidateMethod; 1040 } 1041 } 1042 1043 throw new NoSuchMethodException("Can't find a public method for " + 1044 methodName + " " + ArrayUtils.toString(parameterTypes)); 1045 } 1046 1047 // ---------------------------------------------------------------------- 1048 /** 1049 * Converts a class name to a JLS style class name. 1050 * 1051 * @param className the class name 1052 * @return the converted name 1053 */ 1054 private static String toCanonicalName(String className) { 1055 className = StringUtils.deleteWhitespace(className); 1056 if (className == null) { 1057 throw new NullPointerException("className must not be null."); 1058 } else if (className.endsWith("[]")) { 1059 final StringBuilder classNameBuffer = new StringBuilder(); 1060 while (className.endsWith("[]")) { 1061 className = className.substring(0, className.length() - 2); 1062 classNameBuffer.append("["); 1063 } 1064 final String abbreviation = abbreviationMap.get(className); 1065 if (abbreviation != null) { 1066 classNameBuffer.append(abbreviation); 1067 } else { 1068 classNameBuffer.append("L").append(className).append(";"); 1069 } 1070 className = classNameBuffer.toString(); 1071 } 1072 return className; 1073 } 1074 1075 /** 1076 * <p>Converts an array of {@code Object} in to an array of {@code Class} objects. 1077 * If any of these objects is null, a null element will be inserted into the array.</p> 1078 * 1079 * <p>This method returns {@code null} for a {@code null} input array.</p> 1080 * 1081 * @param array an {@code Object} array 1082 * @return a {@code Class} array, {@code null} if null array input 1083 * @since 2.4 1084 */ 1085 public static Class<?>[] toClass(final Object... array) { 1086 if (array == null) { 1087 return null; 1088 } else if (array.length == 0) { 1089 return ArrayUtils.EMPTY_CLASS_ARRAY; 1090 } 1091 final Class<?>[] classes = new Class[array.length]; 1092 for (int i = 0; i < array.length; i++) { 1093 classes[i] = array[i] == null ? null : array[i].getClass(); 1094 } 1095 return classes; 1096 } 1097 1098 // Short canonical name 1099 // ---------------------------------------------------------------------- 1100 /** 1101 * <p>Gets the canonical name minus the package name for an {@code Object}.</p> 1102 * 1103 * @param object the class to get the short name for, may be null 1104 * @param valueIfNull the value to return if null 1105 * @return the canonical name of the object without the package name, or the null value 1106 * @since 2.4 1107 */ 1108 public static String getShortCanonicalName(final Object object, final String valueIfNull) { 1109 if (object == null) { 1110 return valueIfNull; 1111 } 1112 return getShortCanonicalName(object.getClass().getName()); 1113 } 1114 1115 /** 1116 * <p>Gets the canonical name minus the package name from a {@code Class}.</p> 1117 * 1118 * @param cls the class to get the short name for. 1119 * @return the canonical name without the package name or an empty string 1120 * @since 2.4 1121 */ 1122 public static String getShortCanonicalName(final Class<?> cls) { 1123 if (cls == null) { 1124 return StringUtils.EMPTY; 1125 } 1126 return getShortCanonicalName(cls.getName()); 1127 } 1128 1129 /** 1130 * <p>Gets the canonical name minus the package name from a String.</p> 1131 * 1132 * <p>The string passed in is assumed to be a canonical name - it is not checked.</p> 1133 * 1134 * @param canonicalName the class name to get the short name for 1135 * @return the canonical name of the class without the package name or an empty string 1136 * @since 2.4 1137 */ 1138 public static String getShortCanonicalName(final String canonicalName) { 1139 return ClassUtils.getShortClassName(getCanonicalName(canonicalName)); 1140 } 1141 1142 // Package name 1143 // ---------------------------------------------------------------------- 1144 /** 1145 * <p>Gets the package name from the canonical name of an {@code Object}.</p> 1146 * 1147 * @param object the class to get the package name for, may be null 1148 * @param valueIfNull the value to return if null 1149 * @return the package name of the object, or the null value 1150 * @since 2.4 1151 */ 1152 public static String getPackageCanonicalName(final Object object, final String valueIfNull) { 1153 if (object == null) { 1154 return valueIfNull; 1155 } 1156 return getPackageCanonicalName(object.getClass().getName()); 1157 } 1158 1159 /** 1160 * <p>Gets the package name from the canonical name of a {@code Class}.</p> 1161 * 1162 * @param cls the class to get the package name for, may be {@code null}. 1163 * @return the package name or an empty string 1164 * @since 2.4 1165 */ 1166 public static String getPackageCanonicalName(final Class<?> cls) { 1167 if (cls == null) { 1168 return StringUtils.EMPTY; 1169 } 1170 return getPackageCanonicalName(cls.getName()); 1171 } 1172 1173 /** 1174 * <p>Gets the package name from the canonical name. </p> 1175 * 1176 * <p>The string passed in is assumed to be a canonical name - it is not checked.</p> 1177 * <p>If the class is unpackaged, return an empty string.</p> 1178 * 1179 * @param canonicalName the canonical name to get the package name for, may be {@code null} 1180 * @return the package name or an empty string 1181 * @since 2.4 1182 */ 1183 public static String getPackageCanonicalName(final String canonicalName) { 1184 return ClassUtils.getPackageName(getCanonicalName(canonicalName)); 1185 } 1186 1187 /** 1188 * <p>Converts a given name of class into canonical format. 1189 * If name of class is not a name of array class it returns 1190 * unchanged name.</p> 1191 * <p>Example: 1192 * <ul> 1193 * <li>{@code getCanonicalName("[I") = "int[]"}</li> 1194 * <li>{@code getCanonicalName("[Ljava.lang.String;") = "java.lang.String[]"}</li> 1195 * <li>{@code getCanonicalName("java.lang.String") = "java.lang.String"}</li> 1196 * </ul> 1197 * </p> 1198 * 1199 * @param className the name of class 1200 * @return canonical form of class name 1201 * @since 2.4 1202 */ 1203 private static String getCanonicalName(String className) { 1204 className = StringUtils.deleteWhitespace(className); 1205 if (className == null) { 1206 return null; 1207 } 1208 int dim = 0; 1209 while (className.startsWith("[")) { 1210 dim++; 1211 className = className.substring(1); 1212 } 1213 if (dim < 1) { 1214 return className; 1215 } 1216 if (className.startsWith("L")) { 1217 className = className.substring( 1218 1, 1219 className.endsWith(";") 1220 ? className.length() - 1 1221 : className.length()); 1222 } else { 1223 if (className.length() > 0) { 1224 className = reverseAbbreviationMap.get(className.substring(0, 1)); 1225 } 1226 } 1227 final StringBuilder canonicalClassNameBuffer = new StringBuilder(className); 1228 for (int i = 0; i < dim; i++) { 1229 canonicalClassNameBuffer.append("[]"); 1230 } 1231 return canonicalClassNameBuffer.toString(); 1232 } 1233 1234 /** 1235 * Get an {@link Iterable} that can iterate over a class hierarchy in ascending (subclass to superclass) order, 1236 * excluding interfaces. 1237 * 1238 * @param type the type to get the class hierarchy from 1239 * @return Iterable an Iterable over the class hierarchy of the given class 1240 * @since 3.2 1241 */ 1242 public static Iterable<Class<?>> hierarchy(final Class<?> type) { 1243 return hierarchy(type, Interfaces.EXCLUDE); 1244 } 1245 1246 /** 1247 * Get an {@link Iterable} that can iterate over a class hierarchy in ascending (subclass to superclass) order. 1248 * 1249 * @param type the type to get the class hierarchy from 1250 * @param interfacesBehavior switch indicating whether to include or exclude interfaces 1251 * @return Iterable an Iterable over the class hierarchy of the given class 1252 * @since 3.2 1253 */ 1254 public static Iterable<Class<?>> hierarchy(final Class<?> type, final Interfaces interfacesBehavior) { 1255 final Iterable<Class<?>> classes = new Iterable<Class<?>>() { 1256 1257 @Override 1258 public Iterator<Class<?>> iterator() { 1259 final MutableObject<Class<?>> next = new MutableObject<Class<?>>(type); 1260 return new Iterator<Class<?>>() { 1261 1262 @Override 1263 public boolean hasNext() { 1264 return next.getValue() != null; 1265 } 1266 1267 @Override 1268 public Class<?> next() { 1269 final Class<?> result = next.getValue(); 1270 next.setValue(result.getSuperclass()); 1271 return result; 1272 } 1273 1274 @Override 1275 public void remove() { 1276 throw new UnsupportedOperationException(); 1277 } 1278 1279 }; 1280 } 1281 1282 }; 1283 if (interfacesBehavior != Interfaces.INCLUDE) { 1284 return classes; 1285 } 1286 return new Iterable<Class<?>>() { 1287 1288 @Override 1289 public Iterator<Class<?>> iterator() { 1290 final Set<Class<?>> seenInterfaces = new HashSet<Class<?>>(); 1291 final Iterator<Class<?>> wrapped = classes.iterator(); 1292 1293 return new Iterator<Class<?>>() { 1294 Iterator<Class<?>> interfaces = Collections.<Class<?>> emptySet().iterator(); 1295 1296 @Override 1297 public boolean hasNext() { 1298 return interfaces.hasNext() || wrapped.hasNext(); 1299 } 1300 1301 @Override 1302 public Class<?> next() { 1303 if (interfaces.hasNext()) { 1304 final Class<?> nextInterface = interfaces.next(); 1305 seenInterfaces.add(nextInterface); 1306 return nextInterface; 1307 } 1308 final Class<?> nextSuperclass = wrapped.next(); 1309 final Set<Class<?>> currentInterfaces = new LinkedHashSet<Class<?>>(); 1310 walkInterfaces(currentInterfaces, nextSuperclass); 1311 interfaces = currentInterfaces.iterator(); 1312 return nextSuperclass; 1313 } 1314 1315 private void walkInterfaces(final Set<Class<?>> addTo, final Class<?> c) { 1316 for (final Class<?> iface : c.getInterfaces()) { 1317 if (!seenInterfaces.contains(iface)) { 1318 addTo.add(iface); 1319 } 1320 walkInterfaces(addTo, iface); 1321 } 1322 } 1323 1324 @Override 1325 public void remove() { 1326 throw new UnsupportedOperationException(); 1327 } 1328 1329 }; 1330 } 1331 }; 1332 } 1333 1334}