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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 | +} | |