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| 1 | /* | ||
| 2 | * Copyright (c) 2004, 2008, 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 javax.management; | ||
| 27 | |||
| 28 | import com.sun.jmx.mbeanserver.Util; | ||
| 29 | import java.io.InvalidObjectException; | ||
| 30 | import java.lang.reflect.Array; | ||
| 31 | import java.util.Arrays; | ||
| 32 | import java.util.Comparator; | ||
| 33 | import java.util.Map; | ||
| 34 | import java.util.SortedMap; | ||
| 35 | import java.util.TreeMap; | ||
| 36 | |||
| 37 | /** | ||
| 38 | * An immutable descriptor. | ||
| 39 | * @since 1.6 | ||
| 40 | */ | ||
| 41 | public class ImmutableDescriptor implements Descriptor { | ||
| 42 | private static final long serialVersionUID = 8853308591080540165L; | ||
| 43 | |||
| 44 | /** | ||
| 45 | * The names of the fields in this ImmutableDescriptor with their | ||
| 46 | * original case. The names must be in alphabetical order as determined | ||
| 47 | * by {@link String#CASE_INSENSITIVE_ORDER}. | ||
| 48 | */ | ||
| 49 | private final String[] names; | ||
| 50 | /** | ||
| 51 | * The values of the fields in this ImmutableDescriptor. The | ||
| 52 | * elements in this array match the corresponding elements in the | ||
| 53 | * {@code names} array. | ||
| 54 | */ | ||
| 55 | private final Object[] values; | ||
| 56 | |||
| 57 | private transient int hashCode = -1; | ||
| 58 | |||
| 59 | /** | ||
| 60 | * An empty descriptor. | ||
| 61 | */ | ||
| 62 | public static final ImmutableDescriptor EMPTY_DESCRIPTOR = | ||
| 63 | new ImmutableDescriptor(); | ||
| 64 | |||
| 65 | /** | ||
| 66 | * Construct a descriptor containing the given fields and values. | ||
| 67 | * | ||
| 68 | * @throws IllegalArgumentException if either array is null, or | ||
| 69 | * if the arrays have different sizes, or | ||
| 70 | * if a field name is null or empty, or if the same field name | ||
| 71 | * appears more than once. | ||
| 72 | */ | ||
| 73 | public ImmutableDescriptor(String[] fieldNames, Object[] fieldValues) { | ||
| 74 | this(makeMap(fieldNames, fieldValues)); | ||
| 75 | } | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Construct a descriptor containing the given fields. Each String | ||
| 79 | * must be of the form {@code fieldName=fieldValue}. The field name | ||
| 80 | * ends at the first {@code =} character; for example if the String | ||
| 81 | * is {@code a=b=c} then the field name is {@code a} and its value | ||
| 82 | * is {@code b=c}. | ||
| 83 | * | ||
| 84 | * @throws IllegalArgumentException if the parameter is null, or | ||
| 85 | * if a field name is empty, or if the same field name appears | ||
| 86 | * more than once, or if one of the strings does not contain | ||
| 87 | * an {@code =} character. | ||
| 88 | */ | ||
| 89 | public ImmutableDescriptor(String... fields) { | ||
| 90 | this(makeMap(fields)); | ||
| 91 | } | ||
| 92 | |||
| 93 | /** | ||
| 94 | * <p>Construct a descriptor where the names and values of the fields | ||
| 95 | * are the keys and values of the given Map.</p> | ||
| 96 | * | ||
| 97 | * @throws IllegalArgumentException if the parameter is null, or | ||
| 98 | * if a field name is null or empty, or if the same field name appears | ||
| 99 | * more than once (which can happen because field names are not case | ||
| 100 | * sensitive). | ||
| 101 | */ | ||
| 102 | public ImmutableDescriptor(Map<String, ?> fields) { | ||
| 103 | if (fields == null) | ||
| 104 | throw new IllegalArgumentException("Null Map"); | ||
| 105 | SortedMap<String, Object> map = | ||
| 106 | new TreeMap<String, Object>(String.CASE_INSENSITIVE_ORDER); | ||
| 107 | for (Map.Entry<String, ?> entry : fields.entrySet()) { | ||
| 108 | String name = entry.getKey(); | ||
| 109 | if (name == null || name.equals("")) | ||
| 110 | throw new IllegalArgumentException("Empty or null field name"); | ||
| 111 | if (map.containsKey(name)) | ||
| 112 | throw new IllegalArgumentException("Duplicate name: " + name); | ||
| 113 | map.put(name, entry.getValue()); | ||
| 114 | } | ||
| 115 | int size = map.size(); | ||
| 116 | this.names = map.keySet().toArray(new String[size]); | ||
| 117 | this.values = map.values().toArray(new Object[size]); | ||
| 118 | } | ||
| 119 | |||
| 120 | /** | ||
| 121 | * This method can replace a deserialized instance of this | ||
| 122 | * class with another instance. For example, it might replace | ||
| 123 | * a deserialized empty ImmutableDescriptor with | ||
| 124 | * {@link #EMPTY_DESCRIPTOR}. | ||
| 125 | * | ||
| 126 | * @return the replacement object, which may be {@code this}. | ||
| 127 | * | ||
| 128 | * @throws InvalidObjectException if the read object has invalid fields. | ||
| 129 | */ | ||
| 130 | private Object readResolve() throws InvalidObjectException { | ||
| 131 | |||
| 132 | boolean bad = false; | ||
| 133 | if (names == null || values == null || names.length != values.length) | ||
| 134 | bad = true; | ||
| 135 | if (!bad) { | ||
| 136 | if (names.length == 0 && getClass() == ImmutableDescriptor.class) | ||
| 137 | return EMPTY_DESCRIPTOR; | ||
| 138 | final Comparator<String> compare = String.CASE_INSENSITIVE_ORDER; | ||
| 139 | String lastName = ""; // also catches illegal null name | ||
| 140 | for (int i = 0; i < names.length; i++) { | ||
| 141 | if (names[i] == null || | ||
| 142 | compare.compare(lastName, names[i]) >= 0) { | ||
| 143 | bad = true; | ||
| 144 | break; | ||
| 145 | } | ||
| 146 | lastName = names[i]; | ||
| 147 | } | ||
| 148 | } | ||
| 149 | if (bad) | ||
| 150 | throw new InvalidObjectException("Bad names or values"); | ||
| 151 | |||
| 152 | return this; | ||
| 153 | } | ||
| 154 | |||
| 155 | private static SortedMap<String, ?> makeMap(String[] fieldNames, | ||
| 156 | Object[] fieldValues) { | ||
| 157 | if (fieldNames == null || fieldValues == null) | ||
| 158 | throw new IllegalArgumentException("Null array parameter"); | ||
| 159 | if (fieldNames.length != fieldValues.length) | ||
| 160 | throw new IllegalArgumentException("Different size arrays"); | ||
| 161 | SortedMap<String, Object> map = | ||
| 162 | new TreeMap<String, Object>(String.CASE_INSENSITIVE_ORDER); | ||
| 163 | for (int i = 0; i < fieldNames.length; i++) { | ||
| 164 | String name = fieldNames[i]; | ||
| 165 | if (name == null || name.equals("")) | ||
| 166 | throw new IllegalArgumentException("Empty or null field name"); | ||
| 167 | Object old = map.put(name, fieldValues[i]); | ||
| 168 | if (old != null) { | ||
| 169 | throw new IllegalArgumentException("Duplicate field name: " + | ||
| 170 | name); | ||
| 171 | } | ||
| 172 | } | ||
| 173 | return map; | ||
| 174 | } | ||
| 175 | |||
| 176 | private static SortedMap<String, ?> makeMap(String[] fields) { | ||
| 177 | if (fields == null) | ||
| 178 | throw new IllegalArgumentException("Null fields parameter"); | ||
| 179 | String[] fieldNames = new String[fields.length]; | ||
| 180 | String[] fieldValues = new String[fields.length]; | ||
| 181 | for (int i = 0; i < fields.length; i++) { | ||
| 182 | String field = fields[i]; | ||
| 183 | int eq = field.indexOf('='); | ||
| 184 | if (eq < 0) { | ||
| 185 | throw new IllegalArgumentException("Missing = character: " + | ||
| 186 | field); | ||
| 187 | } | ||
| 188 | fieldNames[i] = field.substring(0, eq); | ||
| 189 | // makeMap will catch the case where the name is empty | ||
| 190 | fieldValues[i] = field.substring(eq + 1); | ||
| 191 | } | ||
| 192 | return makeMap(fieldNames, fieldValues); | ||
| 193 | } | ||
| 194 | |||
| 195 | /** | ||
| 196 | * <p>Return an {@code ImmutableDescriptor} whose contents are the union of | ||
| 197 | * the given descriptors. Every field name that appears in any of | ||
| 198 | * the descriptors will appear in the result with the | ||
| 199 | * value that it has when the method is called. Subsequent changes | ||
| 200 | * to any of the descriptors do not affect the ImmutableDescriptor | ||
| 201 | * returned here.</p> | ||
| 202 | * | ||
| 203 | * <p>In the simplest case, there is only one descriptor and the | ||
| 204 | * returned {@code ImmutableDescriptor} is a copy of its fields at the | ||
| 205 | * time this method is called:</p> | ||
| 206 | * | ||
| 207 | * <pre> | ||
| 208 | * Descriptor d = something(); | ||
| 209 | * ImmutableDescriptor copy = ImmutableDescriptor.union(d); | ||
| 210 | * </pre> | ||
| 211 | * | ||
| 212 | * @param descriptors the descriptors to be combined. Any of the | ||
| 213 | * descriptors can be null, in which case it is skipped. | ||
| 214 | * | ||
| 215 | * @return an {@code ImmutableDescriptor} that is the union of the given | ||
| 216 | * descriptors. The returned object may be identical to one of the | ||
| 217 | * input descriptors if it is an ImmutableDescriptor that contains all of | ||
| 218 | * the required fields. | ||
| 219 | * | ||
| 220 | * @throws IllegalArgumentException if two Descriptors contain the | ||
| 221 | * same field name with different associated values. Primitive array | ||
| 222 | * values are considered the same if they are of the same type with | ||
| 223 | * the same elements. Object array values are considered the same if | ||
| 224 | * {@link Arrays#deepEquals(Object[],Object[])} returns true. | ||
| 225 | */ | ||
| 226 | public static ImmutableDescriptor union(Descriptor... descriptors) { | ||
| 227 | // Optimize the case where exactly one Descriptor is non-Empty | ||
| 228 | // and it is immutable - we can just return it. | ||
| 229 | int index = findNonEmpty(descriptors, 0); | ||
| 230 | if (index < 0) | ||
| 231 | return EMPTY_DESCRIPTOR; | ||
| 232 | if (descriptors[index] instanceof ImmutableDescriptor | ||
| 233 | && findNonEmpty(descriptors, index + 1) < 0) | ||
| 234 | return (ImmutableDescriptor) descriptors[index]; | ||
| 235 | |||
| 236 | Map<String, Object> map = | ||
| 237 | new TreeMap<String, Object>(String.CASE_INSENSITIVE_ORDER); | ||
| 238 | ImmutableDescriptor biggestImmutable = EMPTY_DESCRIPTOR; | ||
| 239 | for (Descriptor d : descriptors) { | ||
| 240 | if (d != null) { | ||
| 241 | String[] names; | ||
| 242 | if (d instanceof ImmutableDescriptor) { | ||
| 243 | ImmutableDescriptor id = (ImmutableDescriptor) d; | ||
| 244 | names = id.names; | ||
| 245 | if (id.getClass() == ImmutableDescriptor.class | ||
| 246 | && names.length > biggestImmutable.names.length) | ||
| 247 | biggestImmutable = id; | ||
| 248 | } else | ||
| 249 | names = d.getFieldNames(); | ||
| 250 | for (String n : names) { | ||
| 251 | Object v = d.getFieldValue(n); | ||
| 252 | Object old = map.put(n, v); | ||
| 253 | if (old != null) { | ||
| 254 | boolean equal; | ||
| 255 | if (old.getClass().isArray()) { | ||
| 256 | equal = Arrays.deepEquals(new Object[] {old}, | ||
| 257 | new Object[] {v}); | ||
| 258 | } else | ||
| 259 | equal = old.equals(v); | ||
| 260 | if (!equal) { | ||
| 261 | final String msg = | ||
| 262 | "Inconsistent values for descriptor field " + | ||
| 263 | n + ": " + old + " :: " + v; | ||
| 264 | throw new IllegalArgumentException(msg); | ||
| 265 | } | ||
| 266 | } | ||
| 267 | } | ||
| 268 | } | ||
| 269 | } | ||
| 270 | if (biggestImmutable.names.length == map.size()) | ||
| 271 | return biggestImmutable; | ||
| 272 | return new ImmutableDescriptor(map); | ||
| 273 | } | ||
| 274 | |||
| 275 | private static boolean isEmpty(Descriptor d) { | ||
| 276 | if (d == null) | ||
| 277 | return true; | ||
| 278 | else if (d instanceof ImmutableDescriptor) | ||
| 279 | return ((ImmutableDescriptor) d).names.length == 0; | ||
| 280 | else | ||
| 281 | return (d.getFieldNames().length == 0); | ||
| 282 | } | ||
| 283 | |||
| 284 | private static int findNonEmpty(Descriptor[] ds, int start) { | ||
| 285 | for (int i = start; i < ds.length; i++) { | ||
| 286 | if (!isEmpty(ds[i])) | ||
| 287 | return i; | ||
| 288 | } | ||
| 289 | return -1; | ||
| 290 | } | ||
| 291 | |||
| 292 | private int fieldIndex(String name) { | ||
| 293 | return Arrays.binarySearch(names, name, String.CASE_INSENSITIVE_ORDER); | ||
| 294 | } | ||
| 295 | |||
| 296 | public final Object getFieldValue(String fieldName) { | ||
| 297 | checkIllegalFieldName(fieldName); | ||
| 298 | int i = fieldIndex(fieldName); | ||
| 299 | if (i < 0) | ||
| 300 | return null; | ||
| 301 | Object v = values[i]; | ||
| 302 | if (v == null || !v.getClass().isArray()) | ||
| 303 | return v; | ||
| 304 | if (v instanceof Object[]) | ||
| 305 | return ((Object[]) v).clone(); | ||
| 306 | // clone the primitive array, could use an 8-way if/else here | ||
| 307 | int len = Array.getLength(v); | ||
| 308 | Object a = Array.newInstance(v.getClass().getComponentType(), len); | ||
| 309 | System.arraycopy(v, 0, a, 0, len); | ||
| 310 | return a; | ||
| 311 | } | ||
| 312 | |||
| 313 | public final String[] getFields() { | ||
| 314 | String[] result = new String[names.length]; | ||
| 315 | for (int i = 0; i < result.length; i++) { | ||
| 316 | Object value = values[i]; | ||
| 317 | if (value == null) | ||
| 318 | value = ""; | ||
| 319 | else if (!(value instanceof String)) | ||
| 320 | value = "(" + value + ")"; | ||
| 321 | result[i] = names[i] + "=" + value; | ||
| 322 | } | ||
| 323 | return result; | ||
| 324 | } | ||
| 325 | |||
| 326 | public final Object[] getFieldValues(String... fieldNames) { | ||
| 327 | if (fieldNames == null) | ||
| 328 | return values.clone(); | ||
| 329 | Object[] result = new Object[fieldNames.length]; | ||
| 330 | for (int i = 0; i < fieldNames.length; i++) { | ||
| 331 | String name = fieldNames[i]; | ||
| 332 | if (name != null && !name.equals("")) | ||
| 333 | result[i] = getFieldValue(name); | ||
| 334 | } | ||
| 335 | return result; | ||
| 336 | } | ||
| 337 | |||
| 338 | public final String[] getFieldNames() { | ||
| 339 | return names.clone(); | ||
| 340 | } | ||
| 341 | |||
| 342 | /** | ||
| 343 | * Compares this descriptor to the given object. The objects are equal if | ||
| 344 | * the given object is also a Descriptor, and if the two Descriptors have | ||
| 345 | * the same field names (possibly differing in case) and the same | ||
| 346 | * associated values. The respective values for a field in the two | ||
| 347 | * Descriptors are equal if the following conditions hold:</p> | ||
| 348 | * | ||
| 349 | * <ul> | ||
| 350 | * <li>If one value is null then the other must be too.</li> | ||
| 351 | * <li>If one value is a primitive array then the other must be a primitive | ||
| 352 | * array of the same type with the same elements.</li> | ||
| 353 | * <li>If one value is an object array then the other must be too and | ||
| 354 | * {@link Arrays#deepEquals(Object[],Object[])} must return true.</li> | ||
| 355 | * <li>Otherwise {@link Object#equals(Object)} must return true.</li> | ||
| 356 | * </ul> | ||
| 357 | * | ||
| 358 | * @param o the object to compare with. | ||
| 359 | * | ||
| 360 | * @return {@code true} if the objects are the same; {@code false} | ||
| 361 | * otherwise. | ||
| 362 | * | ||
| 363 | */ | ||
| 364 | // Note: this Javadoc is copied from javax.management.Descriptor | ||
| 365 | // due to 6369229. | ||
| 366 | @Override | ||
| 367 | public boolean equals(Object o) { | ||
| 368 | if (o == this) | ||
| 369 | return true; | ||
| 370 | if (!(o instanceof Descriptor)) | ||
| 371 | return false; | ||
| 372 | String[] onames; | ||
| 373 | if (o instanceof ImmutableDescriptor) { | ||
| 374 | onames = ((ImmutableDescriptor) o).names; | ||
| 375 | } else { | ||
| 376 | onames = ((Descriptor) o).getFieldNames(); | ||
| 377 | Arrays.sort(onames, String.CASE_INSENSITIVE_ORDER); | ||
| 378 | } | ||
| 379 | if (names.length != onames.length) | ||
| 380 | return false; | ||
| 381 | for (int i = 0; i < names.length; i++) { | ||
| 382 | if (!names[i].equalsIgnoreCase(onames[i])) | ||
| 383 | return false; | ||
| 384 | } | ||
| 385 | Object[] ovalues; | ||
| 386 | if (o instanceof ImmutableDescriptor) | ||
| 387 | ovalues = ((ImmutableDescriptor) o).values; | ||
| 388 | else | ||
| 389 | ovalues = ((Descriptor) o).getFieldValues(onames); | ||
| 390 | return Arrays.deepEquals(values, ovalues); | ||
| 391 | } | ||
| 392 | |||
| 393 | /** | ||
| 394 | * <p>Returns the hash code value for this descriptor. The hash | ||
| 395 | * code is computed as the sum of the hash codes for each field in | ||
| 396 | * the descriptor. The hash code of a field with name {@code n} | ||
| 397 | * and value {@code v} is {@code n.toLowerCase().hashCode() ^ h}. | ||
| 398 | * Here {@code h} is the hash code of {@code v}, computed as | ||
| 399 | * follows:</p> | ||
| 400 | * | ||
| 401 | * <ul> | ||
| 402 | * <li>If {@code v} is null then {@code h} is 0.</li> | ||
| 403 | * <li>If {@code v} is a primitive array then {@code h} is computed using | ||
| 404 | * the appropriate overloading of {@code java.util.Arrays.hashCode}.</li> | ||
| 405 | * <li>If {@code v} is an object array then {@code h} is computed using | ||
| 406 | * {@link Arrays#deepHashCode(Object[])}.</li> | ||
| 407 | * <li>Otherwise {@code h} is {@code v.hashCode()}.</li> | ||
| 408 | * </ul> | ||
| 409 | * | ||
| 410 | * @return A hash code value for this object. | ||
| 411 | * | ||
| 412 | */ | ||
| 413 | // Note: this Javadoc is copied from javax.management.Descriptor | ||
| 414 | // due to 6369229. | ||
| 415 | @Override | ||
| 416 | public int hashCode() { | ||
| 417 | if (hashCode == -1) { | ||
| 418 | hashCode = Util.hashCode(names, values); | ||
| 419 | } | ||
| 420 | return hashCode; | ||
| 421 | } | ||
| 422 | |||
| 423 | @Override | ||
| 424 | public String toString() { | ||
| 425 | StringBuilder sb = new StringBuilder("{"); | ||
| 426 | for (int i = 0; i < names.length; i++) { | ||
| 427 | if (i > 0) | ||
| 428 | sb.append(", "); | ||
| 429 | sb.append(names[i]).append("="); | ||
| 430 | Object v = values[i]; | ||
| 431 | if (v != null && v.getClass().isArray()) { | ||
| 432 | String s = Arrays.deepToString(new Object[] {v}); | ||
| 433 | s = s.substring(1, s.length() - 1); // remove [...] | ||
| 434 | v = s; | ||
| 435 | } | ||
| 436 | sb.append(String.valueOf(v)); | ||
| 437 | } | ||
| 438 | return sb.append("}").toString(); | ||
| 439 | } | ||
| 440 | |||
| 441 | /** | ||
| 442 | * Returns true if all of the fields have legal values given their | ||
| 443 | * names. This method always returns true, but a subclass can | ||
| 444 | * override it to return false when appropriate. | ||
| 445 | * | ||
| 446 | * @return true if the values are legal. | ||
| 447 | * | ||
| 448 | * @exception RuntimeOperationsException if the validity checking fails. | ||
| 449 | * The method returns false if the descriptor is not valid, but throws | ||
| 450 | * this exception if the attempt to determine validity fails. | ||
| 451 | */ | ||
| 452 | public boolean isValid() { | ||
| 453 | return true; | ||
| 454 | } | ||
| 455 | |||
| 456 | /** | ||
| 457 | * <p>Returns a descriptor which is equal to this descriptor. | ||
| 458 | * Changes to the returned descriptor will have no effect on this | ||
| 459 | * descriptor, and vice versa.</p> | ||
| 460 | * | ||
| 461 | * <p>This method returns the object on which it is called. | ||
| 462 | * A subclass can override it | ||
| 463 | * to return another object provided the contract is respected. | ||
| 464 | * | ||
| 465 | * @exception RuntimeOperationsException for illegal value for field Names | ||
| 466 | * or field Values. | ||
| 467 | * If the descriptor construction fails for any reason, this exception will | ||
| 468 | * be thrown. | ||
| 469 | */ | ||
| 470 | @Override | ||
| 471 | public Descriptor clone() { | ||
| 472 | return this; | ||
| 473 | } | ||
| 474 | |||
| 475 | /** | ||
| 476 | * This operation is unsupported since this class is immutable. If | ||
| 477 | * this call would change a mutable descriptor with the same contents, | ||
| 478 | * then a {@link RuntimeOperationsException} wrapping an | ||
| 479 | * {@link UnsupportedOperationException} is thrown. Otherwise, | ||
| 480 | * the behavior is the same as it would be for a mutable descriptor: | ||
| 481 | * either an exception is thrown because of illegal parameters, or | ||
| 482 | * there is no effect. | ||
| 483 | */ | ||
| 484 | public final void setFields(String[] fieldNames, Object[] fieldValues) | ||
| 485 | throws RuntimeOperationsException { | ||
| 486 | if (fieldNames == null || fieldValues == null) | ||
| 487 | illegal("Null argument"); | ||
| 488 | if (fieldNames.length != fieldValues.length) | ||
| 489 | illegal("Different array sizes"); | ||
| 490 | for (int i = 0; i < fieldNames.length; i++) | ||
| 491 | checkIllegalFieldName(fieldNames[i]); | ||
| 492 | for (int i = 0; i < fieldNames.length; i++) | ||
| 493 | setField(fieldNames[i], fieldValues[i]); | ||
| 494 | } | ||
| 495 | |||
| 496 | /** | ||
| 497 | * This operation is unsupported since this class is immutable. If | ||
| 498 | * this call would change a mutable descriptor with the same contents, | ||
| 499 | * then a {@link RuntimeOperationsException} wrapping an | ||
| 500 | * {@link UnsupportedOperationException} is thrown. Otherwise, | ||
| 501 | * the behavior is the same as it would be for a mutable descriptor: | ||
| 502 | * either an exception is thrown because of illegal parameters, or | ||
| 503 | * there is no effect. | ||
| 504 | */ | ||
| 505 | public final void setField(String fieldName, Object fieldValue) | ||
| 506 | throws RuntimeOperationsException { | ||
| 507 | checkIllegalFieldName(fieldName); | ||
| 508 | int i = fieldIndex(fieldName); | ||
| 509 | if (i < 0) | ||
| 510 | unsupported(); | ||
| 511 | Object value = values[i]; | ||
| 512 | if ((value == null) ? | ||
| 513 | (fieldValue != null) : | ||
| 514 | !value.equals(fieldValue)) | ||
| 515 | unsupported(); | ||
| 516 | } | ||
| 517 | |||
| 518 | /** | ||
| 519 | * Removes a field from the descriptor. | ||
| 520 | * | ||
| 521 | * @param fieldName String name of the field to be removed. | ||
| 522 | * If the field name is illegal or the field is not found, | ||
| 523 | * no exception is thrown. | ||
| 524 | * | ||
| 525 | * @exception RuntimeOperationsException if a field of the given name | ||
| 526 | * exists and the descriptor is immutable. The wrapped exception will | ||
| 527 | * be an {@link UnsupportedOperationException}. | ||
| 528 | */ | ||
| 529 | public final void removeField(String fieldName) { | ||
| 530 | if (fieldName != null && fieldIndex(fieldName) >= 0) | ||
| 531 | unsupported(); | ||
| 532 | } | ||
| 533 | |||
| 534 | static Descriptor nonNullDescriptor(Descriptor d) { | ||
| 535 | if (d == null) | ||
| 536 | return EMPTY_DESCRIPTOR; | ||
| 537 | else | ||
| 538 | return d; | ||
| 539 | } | ||
| 540 | |||
| 541 | private static void checkIllegalFieldName(String name) { | ||
| 542 | if (name == null || name.equals("")) | ||
| 543 | illegal("Null or empty field name"); | ||
| 544 | } | ||
| 545 | |||
| 546 | private static void unsupported() { | ||
| 547 | UnsupportedOperationException uoe = | ||
| 548 | new UnsupportedOperationException("Descriptor is read-only"); | ||
| 549 | throw new RuntimeOperationsException(uoe); | ||
| 550 | } | ||
| 551 | |||
| 552 | private static void illegal(String message) { | ||
| 553 | IllegalArgumentException iae = new IllegalArgumentException(message); | ||
| 554 | throw new RuntimeOperationsException(iae); | ||
| 555 | } | ||
| 556 | } | ||