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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2004, 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.print.attribute; | ||
| 27 | |||
| 28 | import java.io.IOException; | ||
| 29 | import java.io.ObjectInputStream; | ||
| 30 | import java.io.ObjectOutputStream; | ||
| 31 | import java.io.Serializable; | ||
| 32 | import java.util.HashMap; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * Class HashAttributeSet provides an <code>AttributeSet</code> | ||
| 36 | * implementation with characteristics of a hash map. | ||
| 37 | * <P> | ||
| 38 | * | ||
| 39 | * @author Alan Kaminsky | ||
| 40 | */ | ||
| 41 | public class HashAttributeSet implements AttributeSet, Serializable { | ||
| 42 | |||
| 43 | private static final long serialVersionUID = 5311560590283707917L; | ||
| 44 | |||
| 45 | /** | ||
| 46 | * The interface of which all members of this attribute set must be an | ||
| 47 | * instance. It is assumed to be interface {@link Attribute Attribute} | ||
| 48 | * or a subinterface thereof. | ||
| 49 | * @serial | ||
| 50 | */ | ||
| 51 | private Class myInterface; | ||
| 52 | |||
| 53 | /* | ||
| 54 | * A HashMap used by the implementation. | ||
| 55 | * The serialised form doesn't include this instance variable. | ||
| 56 | */ | ||
| 57 | private transient HashMap attrMap = new HashMap(); | ||
| 58 | |||
| 59 | /** | ||
| 60 | * Write the instance to a stream (ie serialize the object) | ||
| 61 | * | ||
| 62 | * @serialData | ||
| 63 | * The serialized form of an attribute set explicitly writes the | ||
| 64 | * number of attributes in the set, and each of the attributes. | ||
| 65 | * This does not guarantee equality of serialized forms since | ||
| 66 | * the order in which the attributes are written is not defined. | ||
| 67 | */ | ||
| 68 | private void writeObject(ObjectOutputStream s) throws IOException { | ||
| 69 | |||
| 70 | s.defaultWriteObject(); | ||
| 71 | Attribute [] attrs = toArray(); | ||
| 72 | s.writeInt(attrs.length); | ||
| 73 | for (int i = 0; i < attrs.length; i++) { | ||
| 74 | s.writeObject(attrs[i]); | ||
| 75 | } | ||
| 76 | } | ||
| 77 | |||
| 78 | /** | ||
| 79 | * Reconstitute an instance from a stream that is, deserialize it). | ||
| 80 | */ | ||
| 81 | private void readObject(ObjectInputStream s) | ||
| 82 | throws ClassNotFoundException, IOException { | ||
| 83 | |||
| 84 | s.defaultReadObject(); | ||
| 85 | attrMap = new HashMap(); | ||
| 86 | int count = s.readInt(); | ||
| 87 | Attribute attr; | ||
| 88 | for (int i = 0; i < count; i++) { | ||
| 89 | attr = (Attribute)s.readObject(); | ||
| 90 | add(attr); | ||
| 91 | } | ||
| 92 | } | ||
| 93 | |||
| 94 | /** | ||
| 95 | * Construct a new, empty attribute set. | ||
| 96 | */ | ||
| 97 | public HashAttributeSet() { | ||
| 98 | this(Attribute.class); | ||
| 99 | } | ||
| 100 | |||
| 101 | /** | ||
| 102 | * Construct a new attribute set, | ||
| 103 | * initially populated with the given attribute. | ||
| 104 | * | ||
| 105 | * @param attribute Attribute value to add to the set. | ||
| 106 | * | ||
| 107 | * @exception NullPointerException | ||
| 108 | * (unchecked exception) Thrown if <CODE>attribute</CODE> is null. | ||
| 109 | */ | ||
| 110 | public HashAttributeSet(Attribute attribute) { | ||
| 111 | this (attribute, Attribute.class); | ||
| 112 | } | ||
| 113 | |||
| 114 | /** | ||
| 115 | * Construct a new attribute set, | ||
| 116 | * initially populated with the values from the | ||
| 117 | * given array. The new attribute set is populated by | ||
| 118 | * adding the elements of <CODE>attributes</CODE> array to the set in | ||
| 119 | * sequence, starting at index 0. Thus, later array elements may replace | ||
| 120 | * earlier array elements if the array contains duplicate attribute | ||
| 121 | * values or attribute categories. | ||
| 122 | * | ||
| 123 | * @param attributes Array of attribute values to add to the set. | ||
| 124 | * If null, an empty attribute set is constructed. | ||
| 125 | * | ||
| 126 | * @exception NullPointerException | ||
| 127 | * (unchecked exception) Thrown if any element of | ||
| 128 | * <CODE>attributes</CODE> is null. | ||
| 129 | */ | ||
| 130 | public HashAttributeSet(Attribute[] attributes) { | ||
| 131 | this (attributes, Attribute.class); | ||
| 132 | } | ||
| 133 | |||
| 134 | /** | ||
| 135 | * Construct a new attribute set, | ||
| 136 | * initially populated with the values from the given set. | ||
| 137 | * | ||
| 138 | * @param attributes Set of attributes from which to initialise this set. | ||
| 139 | * If null, an empty attribute set is constructed. | ||
| 140 | * | ||
| 141 | */ | ||
| 142 | public HashAttributeSet(AttributeSet attributes) { | ||
| 143 | this (attributes, Attribute.class); | ||
| 144 | } | ||
| 145 | |||
| 146 | /** | ||
| 147 | * Construct a new, empty attribute set, where the members of | ||
| 148 | * the attribute set are restricted to the given interface. | ||
| 149 | * | ||
| 150 | * @param interfaceName The interface of which all members of this | ||
| 151 | * attribute set must be an instance. It is assumed to | ||
| 152 | * be interface {@link Attribute Attribute} or a | ||
| 153 | * subinterface thereof. | ||
| 154 | * @exception NullPointerException if interfaceName is null. | ||
| 155 | */ | ||
| 156 | protected HashAttributeSet(Class<?> interfaceName) { | ||
| 157 | if (interfaceName == null) { | ||
| 158 | throw new NullPointerException("null interface"); | ||
| 159 | } | ||
| 160 | myInterface = interfaceName; | ||
| 161 | } | ||
| 162 | |||
| 163 | /** | ||
| 164 | * Construct a new attribute set, initially populated with the given | ||
| 165 | * attribute, where the members of the attribute set are restricted to the | ||
| 166 | * given interface. | ||
| 167 | * | ||
| 168 | * @param attribute Attribute value to add to the set. | ||
| 169 | * @param interfaceName The interface of which all members of this | ||
| 170 | * attribute set must be an instance. It is assumed to | ||
| 171 | * be interface {@link Attribute Attribute} or a | ||
| 172 | * subinterface thereof. | ||
| 173 | * | ||
| 174 | * @exception NullPointerException | ||
| 175 | * (unchecked exception) Thrown if <CODE>attribute</CODE> is null. | ||
| 176 | * @exception NullPointerException if interfaceName is null. | ||
| 177 | * @exception ClassCastException | ||
| 178 | * (unchecked exception) Thrown if <CODE>attribute</CODE> is not an | ||
| 179 | * instance of <CODE>interfaceName</CODE>. | ||
| 180 | */ | ||
| 181 | protected HashAttributeSet(Attribute attribute, Class<?> interfaceName) { | ||
| 182 | if (interfaceName == null) { | ||
| 183 | throw new NullPointerException("null interface"); | ||
| 184 | } | ||
| 185 | myInterface = interfaceName; | ||
| 186 | add (attribute); | ||
| 187 | } | ||
| 188 | |||
| 189 | /** | ||
| 190 | * Construct a new attribute set, where the members of the attribute | ||
| 191 | * set are restricted to the given interface. | ||
| 192 | * The new attribute set is populated | ||
| 193 | * by adding the elements of <CODE>attributes</CODE> array to the set in | ||
| 194 | * sequence, starting at index 0. Thus, later array elements may replace | ||
| 195 | * earlier array elements if the array contains duplicate attribute | ||
| 196 | * values or attribute categories. | ||
| 197 | * | ||
| 198 | * @param attributes Array of attribute values to add to the set. If | ||
| 199 | * null, an empty attribute set is constructed. | ||
| 200 | * @param interfaceName The interface of which all members of this | ||
| 201 | * attribute set must be an instance. It is assumed to | ||
| 202 | * be interface {@link Attribute Attribute} or a | ||
| 203 | * subinterface thereof. | ||
| 204 | * | ||
| 205 | * @exception NullPointerException | ||
| 206 | * (unchecked exception) Thrown if any element of | ||
| 207 | * <CODE>attributes</CODE> is null. | ||
| 208 | * @exception NullPointerException if interfaceName is null. | ||
| 209 | * @exception ClassCastException | ||
| 210 | * (unchecked exception) Thrown if any element of | ||
| 211 | * <CODE>attributes</CODE> is not an instance of | ||
| 212 | * <CODE>interfaceName</CODE>. | ||
| 213 | */ | ||
| 214 | protected HashAttributeSet(Attribute[] attributes, Class<?> interfaceName) { | ||
| 215 | if (interfaceName == null) { | ||
| 216 | throw new NullPointerException("null interface"); | ||
| 217 | } | ||
| 218 | myInterface = interfaceName; | ||
| 219 | int n = attributes == null ? 0 : attributes.length; | ||
| 220 | for (int i = 0; i < n; ++ i) { | ||
| 221 | add (attributes[i]); | ||
| 222 | } | ||
| 223 | } | ||
| 224 | |||
| 225 | /** | ||
| 226 | * Construct a new attribute set, initially populated with the | ||
| 227 | * values from the given set where the members of the attribute | ||
| 228 | * set are restricted to the given interface. | ||
| 229 | * | ||
| 230 | * @param attributes set of attribute values to initialise the set. If | ||
| 231 | * null, an empty attribute set is constructed. | ||
| 232 | * @param interfaceName The interface of which all members of this | ||
| 233 | * attribute set must be an instance. It is assumed to | ||
| 234 | * be interface {@link Attribute Attribute} or a | ||
| 235 | * subinterface thereof. | ||
| 236 | * | ||
| 237 | * @exception ClassCastException | ||
| 238 | * (unchecked exception) Thrown if any element of | ||
| 239 | * <CODE>attributes</CODE> is not an instance of | ||
| 240 | * <CODE>interfaceName</CODE>. | ||
| 241 | */ | ||
| 242 | protected HashAttributeSet(AttributeSet attributes, Class<?> interfaceName) { | ||
| 243 | myInterface = interfaceName; | ||
| 244 | if (attributes != null) { | ||
| 245 | Attribute[] attribArray = attributes.toArray(); | ||
| 246 | int n = attribArray == null ? 0 : attribArray.length; | ||
| 247 | for (int i = 0; i < n; ++ i) { | ||
| 248 | add (attribArray[i]); | ||
| 249 | } | ||
| 250 | } | ||
| 251 | } | ||
| 252 | |||
| 253 | /** | ||
| 254 | * Returns the attribute value which this attribute set contains in the | ||
| 255 | * given attribute category. Returns <tt>null</tt> if this attribute set | ||
| 256 | * does not contain any attribute value in the given attribute category. | ||
| 257 | * | ||
| 258 | * @param category Attribute category whose associated attribute value | ||
| 259 | * is to be returned. It must be a | ||
| 260 | * {@link java.lang.Class Class} | ||
| 261 | * that implements interface {@link Attribute | ||
| 262 | * Attribute}. | ||
| 263 | * | ||
| 264 | * @return The attribute value in the given attribute category contained | ||
| 265 | * in this attribute set, or <tt>null</tt> if this attribute set | ||
| 266 | * does not contain any attribute value in the given attribute | ||
| 267 | * category. | ||
| 268 | * | ||
| 269 | * @throws NullPointerException | ||
| 270 | * (unchecked exception) Thrown if the <CODE>category</CODE> is null. | ||
| 271 | * @throws ClassCastException | ||
| 272 | * (unchecked exception) Thrown if the <CODE>category</CODE> is not a | ||
| 273 | * {@link java.lang.Class Class} that implements interface {@link | ||
| 274 | * Attribute Attribute}. | ||
| 275 | */ | ||
| 276 | public Attribute get(Class<?> category) { | ||
| 277 | return (Attribute) | ||
| 278 | attrMap.get(AttributeSetUtilities. | ||
| 279 | verifyAttributeCategory(category, | ||
| 280 | Attribute.class)); | ||
| 281 | } | ||
| 282 | |||
| 283 | /** | ||
| 284 | * Adds the specified attribute to this attribute set if it is not | ||
| 285 | * already present, first removing any existing in the same | ||
| 286 | * attribute category as the specified attribute value. | ||
| 287 | * | ||
| 288 | * @param attribute Attribute value to be added to this attribute set. | ||
| 289 | * | ||
| 290 | * @return <tt>true</tt> if this attribute set changed as a result of the | ||
| 291 | * call, i.e., the given attribute value was not already a | ||
| 292 | * member of this attribute set. | ||
| 293 | * | ||
| 294 | * @throws NullPointerException | ||
| 295 | * (unchecked exception) Thrown if the <CODE>attribute</CODE> is null. | ||
| 296 | * @throws UnmodifiableSetException | ||
| 297 | * (unchecked exception) Thrown if this attribute set does not support | ||
| 298 | * the <CODE>add()</CODE> operation. | ||
| 299 | */ | ||
| 300 | public boolean add(Attribute attribute) { | ||
| 301 | Object oldAttribute = | ||
| 302 | attrMap.put(attribute.getCategory(), | ||
| 303 | AttributeSetUtilities. | ||
| 304 | verifyAttributeValue(attribute, myInterface)); | ||
| 305 | return (!attribute.equals(oldAttribute)); | ||
| 306 | } | ||
| 307 | |||
| 308 | /** | ||
| 309 | * Removes any attribute for this category from this attribute set if | ||
| 310 | * present. If <CODE>category</CODE> is null, then | ||
| 311 | * <CODE>remove()</CODE> does nothing and returns <tt>false</tt>. | ||
| 312 | * | ||
| 313 | * @param category Attribute category to be removed from this | ||
| 314 | * attribute set. | ||
| 315 | * | ||
| 316 | * @return <tt>true</tt> if this attribute set changed as a result of the | ||
| 317 | * call, i.e., the given attribute category had been a member of | ||
| 318 | * this attribute set. | ||
| 319 | * | ||
| 320 | * @throws UnmodifiableSetException | ||
| 321 | * (unchecked exception) Thrown if this attribute set does not | ||
| 322 | * support the <CODE>remove()</CODE> operation. | ||
| 323 | */ | ||
| 324 | public boolean remove(Class<?> category) { | ||
| 325 | return | ||
| 326 | category != null && | ||
| 327 | AttributeSetUtilities. | ||
| 328 | verifyAttributeCategory(category, Attribute.class) != null && | ||
| 329 | attrMap.remove(category) != null; | ||
| 330 | } | ||
| 331 | |||
| 332 | /** | ||
| 333 | * Removes the specified attribute from this attribute set if | ||
| 334 | * present. If <CODE>attribute</CODE> is null, then | ||
| 335 | * <CODE>remove()</CODE> does nothing and returns <tt>false</tt>. | ||
| 336 | * | ||
| 337 | * @param attribute Attribute value to be removed from this attribute set. | ||
| 338 | * | ||
| 339 | * @return <tt>true</tt> if this attribute set changed as a result of the | ||
| 340 | * call, i.e., the given attribute value had been a member of | ||
| 341 | * this attribute set. | ||
| 342 | * | ||
| 343 | * @throws UnmodifiableSetException | ||
| 344 | * (unchecked exception) Thrown if this attribute set does not | ||
| 345 | * support the <CODE>remove()</CODE> operation. | ||
| 346 | */ | ||
| 347 | public boolean remove(Attribute attribute) { | ||
| 348 | return | ||
| 349 | attribute != null && | ||
| 350 | attrMap.remove(attribute.getCategory()) != null; | ||
| 351 | } | ||
| 352 | |||
| 353 | /** | ||
| 354 | * Returns <tt>true</tt> if this attribute set contains an | ||
| 355 | * attribute for the specified category. | ||
| 356 | * | ||
| 357 | * @param category whose presence in this attribute set is | ||
| 358 | * to be tested. | ||
| 359 | * | ||
| 360 | * @return <tt>true</tt> if this attribute set contains an attribute | ||
| 361 | * value for the specified category. | ||
| 362 | */ | ||
| 363 | public boolean containsKey(Class<?> category) { | ||
| 364 | return | ||
| 365 | category != null && | ||
| 366 | AttributeSetUtilities. | ||
| 367 | verifyAttributeCategory(category, Attribute.class) != null && | ||
| 368 | attrMap.get(category) != null; | ||
| 369 | } | ||
| 370 | |||
| 371 | /** | ||
| 372 | * Returns <tt>true</tt> if this attribute set contains the given | ||
| 373 | * attribute. | ||
| 374 | * | ||
| 375 | * @param attribute value whose presence in this attribute set is | ||
| 376 | * to be tested. | ||
| 377 | * | ||
| 378 | * @return <tt>true</tt> if this attribute set contains the given | ||
| 379 | * attribute value. | ||
| 380 | */ | ||
| 381 | public boolean containsValue(Attribute attribute) { | ||
| 382 | return | ||
| 383 | attribute != null && | ||
| 384 | attribute instanceof Attribute && | ||
| 385 | attribute.equals(attrMap.get(((Attribute)attribute).getCategory())); | ||
| 386 | } | ||
| 387 | |||
| 388 | /** | ||
| 389 | * Adds all of the elements in the specified set to this attribute. | ||
| 390 | * The outcome is the same as if the | ||
| 391 | * {@link #add(Attribute) <CODE>add(Attribute)</CODE>} | ||
| 392 | * operation had been applied to this attribute set successively with | ||
| 393 | * each element from the specified set. | ||
| 394 | * The behavior of the <CODE>addAll(AttributeSet)</CODE> | ||
| 395 | * operation is unspecified if the specified set is modified while | ||
| 396 | * the operation is in progress. | ||
| 397 | * <P> | ||
| 398 | * If the <CODE>addAll(AttributeSet)</CODE> operation throws an exception, | ||
| 399 | * the effect on this attribute set's state is implementation dependent; | ||
| 400 | * elements from the specified set before the point of the exception may | ||
| 401 | * or may not have been added to this attribute set. | ||
| 402 | * | ||
| 403 | * @param attributes whose elements are to be added to this attribute | ||
| 404 | * set. | ||
| 405 | * | ||
| 406 | * @return <tt>true</tt> if this attribute set changed as a result of the | ||
| 407 | * call. | ||
| 408 | * | ||
| 409 | * @throws UnmodifiableSetException | ||
| 410 | * (Unchecked exception) Thrown if this attribute set does not | ||
| 411 | * support the <tt>addAll(AttributeSet)</tt> method. | ||
| 412 | * @throws NullPointerException | ||
| 413 | * (Unchecked exception) Thrown if some element in the specified | ||
| 414 | * set is null, or the set is null. | ||
| 415 | * | ||
| 416 | * @see #add(Attribute) | ||
| 417 | */ | ||
| 418 | public boolean addAll(AttributeSet attributes) { | ||
| 419 | |||
| 420 | Attribute []attrs = attributes.toArray(); | ||
| 421 | boolean result = false; | ||
| 422 | for (int i=0; i<attrs.length; i++) { | ||
| 423 | Attribute newValue = | ||
| 424 | AttributeSetUtilities.verifyAttributeValue(attrs[i], | ||
| 425 | myInterface); | ||
| 426 | Object oldValue = attrMap.put(newValue.getCategory(), newValue); | ||
| 427 | result = (! newValue.equals(oldValue)) || result; | ||
| 428 | } | ||
| 429 | return result; | ||
| 430 | } | ||
| 431 | |||
| 432 | /** | ||
| 433 | * Returns the number of attributes in this attribute set. If this | ||
| 434 | * attribute set contains more than <tt>Integer.MAX_VALUE</tt> elements, | ||
| 435 | * returns <tt>Integer.MAX_VALUE</tt>. | ||
| 436 | * | ||
| 437 | * @return The number of attributes in this attribute set. | ||
| 438 | */ | ||
| 439 | public int size() { | ||
| 440 | return attrMap.size(); | ||
| 441 | } | ||
| 442 | |||
| 443 | /** | ||
| 444 | * | ||
| 445 | * @return the Attributes contained in this set as an array, zero length | ||
| 446 | * if the AttributeSet is empty. | ||
| 447 | */ | ||
| 448 | public Attribute[] toArray() { | ||
| 449 | Attribute []attrs = new Attribute[size()]; | ||
| 450 | attrMap.values().toArray(attrs); | ||
| 451 | return attrs; | ||
| 452 | } | ||
| 453 | |||
| 454 | |||
| 455 | /** | ||
| 456 | * Removes all attributes from this attribute set. | ||
| 457 | * | ||
| 458 | * @throws UnmodifiableSetException | ||
| 459 | * (unchecked exception) Thrown if this attribute set does not support | ||
| 460 | * the <CODE>clear()</CODE> operation. | ||
| 461 | */ | ||
| 462 | public void clear() { | ||
| 463 | attrMap.clear(); | ||
| 464 | } | ||
| 465 | |||
| 466 | /** | ||
| 467 | * Returns true if this attribute set contains no attributes. | ||
| 468 | * | ||
| 469 | * @return true if this attribute set contains no attributes. | ||
| 470 | */ | ||
| 471 | public boolean isEmpty() { | ||
| 472 | return attrMap.isEmpty(); | ||
| 473 | } | ||
| 474 | |||
| 475 | /** | ||
| 476 | * Compares the specified object with this attribute set for equality. | ||
| 477 | * Returns <tt>true</tt> if the given object is also an attribute set and | ||
| 478 | * the two attribute sets contain the same attribute category-attribute | ||
| 479 | * value mappings. This ensures that the | ||
| 480 | * <tt>equals()</tt> method works properly across different | ||
| 481 | * implementations of the AttributeSet interface. | ||
| 482 | * | ||
| 483 | * @param object to be compared for equality with this attribute set. | ||
| 484 | * | ||
| 485 | * @return <tt>true</tt> if the specified object is equal to this | ||
| 486 | * attribute set. | ||
| 487 | */ | ||
| 488 | |||
| 489 | public boolean equals(Object object) { | ||
| 490 | if (object == null || !(object instanceof AttributeSet)) { | ||
| 491 | return false; | ||
| 492 | } | ||
| 493 | |||
| 494 | AttributeSet aset = (AttributeSet)object; | ||
| 495 | if (aset.size() != size()) { | ||
| 496 | return false; | ||
| 497 | } | ||
| 498 | |||
| 499 | Attribute[] attrs = toArray(); | ||
| 500 | for (int i=0;i<attrs.length; i++) { | ||
| 501 | if (!aset.containsValue(attrs[i])) { | ||
| 502 | return false; | ||
| 503 | } | ||
| 504 | } | ||
| 505 | return true; | ||
| 506 | } | ||
| 507 | |||
| 508 | /** | ||
| 509 | * Returns the hash code value for this attribute set. | ||
| 510 | * The hash code of an attribute set is defined to be the sum | ||
| 511 | * of the hash codes of each entry in the AttributeSet. | ||
| 512 | * This ensures that <tt>t1.equals(t2)</tt> implies that | ||
| 513 | * <tt>t1.hashCode()==t2.hashCode()</tt> for any two attribute sets | ||
| 514 | * <tt>t1</tt> and <tt>t2</tt>, as required by the general contract of | ||
| 515 | * {@link java.lang.Object#hashCode() <CODE>Object.hashCode()</CODE>}. | ||
| 516 | * | ||
| 517 | * @return The hash code value for this attribute set. | ||
| 518 | */ | ||
| 519 | public int hashCode() { | ||
| 520 | int hcode = 0; | ||
| 521 | Attribute[] attrs = toArray(); | ||
| 522 | for (int i=0;i<attrs.length; i++) { | ||
| 523 | hcode += attrs[i].hashCode(); | ||
| 524 | } | ||
| 525 | return hcode; | ||
| 526 | } | ||
| 527 | |||
| 528 | } | ||