001/* 002 * Copyright (C) 2009 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.google.common.collect; 018 019import static com.google.common.base.Preconditions.checkNotNull; 020import static java.util.Objects.requireNonNull; 021 022import com.google.common.annotations.GwtCompatible; 023import com.google.common.annotations.GwtIncompatible; 024import com.google.common.annotations.J2ktIncompatible; 025import com.google.common.base.MoreObjects; 026import com.google.errorprone.annotations.CanIgnoreReturnValue; 027import com.google.errorprone.annotations.DoNotCall; 028import com.google.errorprone.annotations.concurrent.LazyInit; 029import com.google.j2objc.annotations.RetainedWith; 030import com.google.j2objc.annotations.Weak; 031import java.io.IOException; 032import java.io.InvalidObjectException; 033import java.io.ObjectInputStream; 034import java.io.ObjectOutputStream; 035import java.util.Arrays; 036import java.util.Collection; 037import java.util.Comparator; 038import java.util.Map; 039import java.util.Map.Entry; 040import java.util.function.Function; 041import java.util.stream.Collector; 042import java.util.stream.Stream; 043import javax.annotation.CheckForNull; 044import org.checkerframework.checker.nullness.qual.Nullable; 045 046/** 047 * A {@link SetMultimap} whose contents will never change, with many other important properties 048 * detailed at {@link ImmutableCollection}. 049 * 050 * <p><b>Warning:</b> As in all {@link SetMultimap}s, do not modify either a key <i>or a value</i> 051 * of a {@code ImmutableSetMultimap} in a way that affects its {@link Object#equals} behavior. 052 * Undefined behavior and bugs will result. 053 * 054 * <p>See the Guava User Guide article on <a href= 055 * "https://github.com/google/guava/wiki/ImmutableCollectionsExplained">immutable collections</a>. 056 * 057 * @author Mike Ward 058 * @since 2.0 059 */ 060@GwtCompatible(serializable = true, emulated = true) 061@ElementTypesAreNonnullByDefault 062public class ImmutableSetMultimap<K, V> extends ImmutableMultimap<K, V> 063 implements SetMultimap<K, V> { 064 /** 065 * Returns a {@link Collector} that accumulates elements into an {@code ImmutableSetMultimap} 066 * whose keys and values are the result of applying the provided mapping functions to the input 067 * elements. 068 * 069 * <p>For streams with defined encounter order (as defined in the Ordering section of the {@link 070 * java.util.stream} Javadoc), that order is preserved, but entries are <a 071 * href="ImmutableMultimap.html#iteration">grouped by key</a>. 072 * 073 * <p>Example: 074 * 075 * <pre>{@code 076 * static final Multimap<Character, String> FIRST_LETTER_MULTIMAP = 077 * Stream.of("banana", "apple", "carrot", "asparagus", "cherry") 078 * .collect(toImmutableSetMultimap(str -> str.charAt(0), str -> str.substring(1))); 079 * 080 * // is equivalent to 081 * 082 * static final Multimap<Character, String> FIRST_LETTER_MULTIMAP = 083 * new ImmutableSetMultimap.Builder<Character, String>() 084 * .put('b', "anana") 085 * .putAll('a', "pple", "sparagus") 086 * .putAll('c', "arrot", "herry") 087 * .build(); 088 * }</pre> 089 * 090 * @since 21.0 091 */ 092 public static <T extends @Nullable Object, K, V> 093 Collector<T, ?, ImmutableSetMultimap<K, V>> toImmutableSetMultimap( 094 Function<? super T, ? extends K> keyFunction, 095 Function<? super T, ? extends V> valueFunction) { 096 return CollectCollectors.toImmutableSetMultimap(keyFunction, valueFunction); 097 } 098 099 /** 100 * Returns a {@code Collector} accumulating entries into an {@code ImmutableSetMultimap}. Each 101 * input element is mapped to a key and a stream of values, each of which are put into the 102 * resulting {@code Multimap}, in the encounter order of the stream and the encounter order of the 103 * streams of values. 104 * 105 * <p>Example: 106 * 107 * <pre>{@code 108 * static final ImmutableSetMultimap<Character, Character> FIRST_LETTER_MULTIMAP = 109 * Stream.of("banana", "apple", "carrot", "asparagus", "cherry") 110 * .collect( 111 * flatteningToImmutableSetMultimap( 112 * str -> str.charAt(0), 113 * str -> str.substring(1).chars().mapToObj(c -> (char) c)); 114 * 115 * // is equivalent to 116 * 117 * static final ImmutableSetMultimap<Character, Character> FIRST_LETTER_MULTIMAP = 118 * ImmutableSetMultimap.<Character, Character>builder() 119 * .putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a')) 120 * .putAll('a', Arrays.asList('p', 'p', 'l', 'e')) 121 * .putAll('c', Arrays.asList('a', 'r', 'r', 'o', 't')) 122 * .putAll('a', Arrays.asList('s', 'p', 'a', 'r', 'a', 'g', 'u', 's')) 123 * .putAll('c', Arrays.asList('h', 'e', 'r', 'r', 'y')) 124 * .build(); 125 * 126 * // after deduplication, the resulting multimap is equivalent to 127 * 128 * static final ImmutableSetMultimap<Character, Character> FIRST_LETTER_MULTIMAP = 129 * ImmutableSetMultimap.<Character, Character>builder() 130 * .putAll('b', Arrays.asList('a', 'n')) 131 * .putAll('a', Arrays.asList('p', 'l', 'e', 's', 'a', 'r', 'g', 'u')) 132 * .putAll('c', Arrays.asList('a', 'r', 'o', 't', 'h', 'e', 'y')) 133 * .build(); 134 * } 135 * }</pre> 136 * 137 * @since 21.0 138 */ 139 public static <T extends @Nullable Object, K, V> 140 Collector<T, ?, ImmutableSetMultimap<K, V>> flatteningToImmutableSetMultimap( 141 Function<? super T, ? extends K> keyFunction, 142 Function<? super T, ? extends Stream<? extends V>> valuesFunction) { 143 return CollectCollectors.flatteningToImmutableSetMultimap(keyFunction, valuesFunction); 144 } 145 146 /** 147 * Returns the empty multimap. 148 * 149 * <p><b>Performance note:</b> the instance returned is a singleton. 150 */ 151 // Casting is safe because the multimap will never hold any elements. 152 @SuppressWarnings("unchecked") 153 public static <K, V> ImmutableSetMultimap<K, V> of() { 154 return (ImmutableSetMultimap<K, V>) EmptyImmutableSetMultimap.INSTANCE; 155 } 156 157 /** Returns an immutable multimap containing a single entry. */ 158 public static <K, V> ImmutableSetMultimap<K, V> of(K k1, V v1) { 159 ImmutableSetMultimap.Builder<K, V> builder = ImmutableSetMultimap.builder(); 160 builder.put(k1, v1); 161 return builder.build(); 162 } 163 164 /** 165 * Returns an immutable multimap containing the given entries, in order. Repeated occurrences of 166 * an entry (according to {@link Object#equals}) after the first are ignored. 167 */ 168 public static <K, V> ImmutableSetMultimap<K, V> of(K k1, V v1, K k2, V v2) { 169 ImmutableSetMultimap.Builder<K, V> builder = ImmutableSetMultimap.builder(); 170 builder.put(k1, v1); 171 builder.put(k2, v2); 172 return builder.build(); 173 } 174 175 /** 176 * Returns an immutable multimap containing the given entries, in order. Repeated occurrences of 177 * an entry (according to {@link Object#equals}) after the first are ignored. 178 */ 179 public static <K, V> ImmutableSetMultimap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) { 180 ImmutableSetMultimap.Builder<K, V> builder = ImmutableSetMultimap.builder(); 181 builder.put(k1, v1); 182 builder.put(k2, v2); 183 builder.put(k3, v3); 184 return builder.build(); 185 } 186 187 /** 188 * Returns an immutable multimap containing the given entries, in order. Repeated occurrences of 189 * an entry (according to {@link Object#equals}) after the first are ignored. 190 */ 191 public static <K, V> ImmutableSetMultimap<K, V> of( 192 K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) { 193 ImmutableSetMultimap.Builder<K, V> builder = ImmutableSetMultimap.builder(); 194 builder.put(k1, v1); 195 builder.put(k2, v2); 196 builder.put(k3, v3); 197 builder.put(k4, v4); 198 return builder.build(); 199 } 200 201 /** 202 * Returns an immutable multimap containing the given entries, in order. Repeated occurrences of 203 * an entry (according to {@link Object#equals}) after the first are ignored. 204 */ 205 public static <K, V> ImmutableSetMultimap<K, V> of( 206 K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) { 207 ImmutableSetMultimap.Builder<K, V> builder = ImmutableSetMultimap.builder(); 208 builder.put(k1, v1); 209 builder.put(k2, v2); 210 builder.put(k3, v3); 211 builder.put(k4, v4); 212 builder.put(k5, v5); 213 return builder.build(); 214 } 215 216 // looking for of() with > 5 entries? Use the builder instead. 217 218 /** Returns a new {@link Builder}. */ 219 public static <K, V> Builder<K, V> builder() { 220 return new Builder<>(); 221 } 222 223 /** 224 * A builder for creating immutable {@code SetMultimap} instances, especially {@code public static 225 * final} multimaps ("constant multimaps"). Example: 226 * 227 * <pre>{@code 228 * static final Multimap<String, Integer> STRING_TO_INTEGER_MULTIMAP = 229 * new ImmutableSetMultimap.Builder<String, Integer>() 230 * .put("one", 1) 231 * .putAll("several", 1, 2, 3) 232 * .putAll("many", 1, 2, 3, 4, 5) 233 * .build(); 234 * }</pre> 235 * 236 * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build 237 * multiple multimaps in series. Each multimap contains the key-value mappings in the previously 238 * created multimaps. 239 * 240 * @since 2.0 241 */ 242 public static final class Builder<K, V> extends ImmutableMultimap.Builder<K, V> { 243 /** 244 * Creates a new builder. The returned builder is equivalent to the builder generated by {@link 245 * ImmutableSetMultimap#builder}. 246 */ 247 public Builder() { 248 super(); 249 } 250 251 @Override 252 Collection<V> newMutableValueCollection() { 253 return Platform.preservesInsertionOrderOnAddsSet(); 254 } 255 256 /** Adds a key-value mapping to the built multimap if it is not already present. */ 257 @CanIgnoreReturnValue 258 @Override 259 public Builder<K, V> put(K key, V value) { 260 super.put(key, value); 261 return this; 262 } 263 264 /** 265 * Adds an entry to the built multimap if it is not already present. 266 * 267 * @since 11.0 268 */ 269 @CanIgnoreReturnValue 270 @Override 271 public Builder<K, V> put(Entry<? extends K, ? extends V> entry) { 272 super.put(entry); 273 return this; 274 } 275 276 /** 277 * {@inheritDoc} 278 * 279 * @since 19.0 280 */ 281 @CanIgnoreReturnValue 282 @Override 283 public Builder<K, V> putAll(Iterable<? extends Entry<? extends K, ? extends V>> entries) { 284 super.putAll(entries); 285 return this; 286 } 287 288 @CanIgnoreReturnValue 289 @Override 290 public Builder<K, V> putAll(K key, Iterable<? extends V> values) { 291 super.putAll(key, values); 292 return this; 293 } 294 295 @CanIgnoreReturnValue 296 @Override 297 public Builder<K, V> putAll(K key, V... values) { 298 return putAll(key, Arrays.asList(values)); 299 } 300 301 @CanIgnoreReturnValue 302 @Override 303 public Builder<K, V> putAll(Multimap<? extends K, ? extends V> multimap) { 304 for (Entry<? extends K, ? extends Collection<? extends V>> entry : 305 multimap.asMap().entrySet()) { 306 putAll(entry.getKey(), entry.getValue()); 307 } 308 return this; 309 } 310 311 @CanIgnoreReturnValue 312 @Override 313 Builder<K, V> combine(ImmutableMultimap.Builder<K, V> other) { 314 super.combine(other); 315 return this; 316 } 317 318 /** 319 * {@inheritDoc} 320 * 321 * @since 8.0 322 */ 323 @CanIgnoreReturnValue 324 @Override 325 public Builder<K, V> orderKeysBy(Comparator<? super K> keyComparator) { 326 super.orderKeysBy(keyComparator); 327 return this; 328 } 329 330 /** 331 * Specifies the ordering of the generated multimap's values for each key. 332 * 333 * <p>If this method is called, the sets returned by the {@code get()} method of the generated 334 * multimap and its {@link Multimap#asMap()} view are {@link ImmutableSortedSet} instances. 335 * However, serialization does not preserve that property, though it does maintain the key and 336 * value ordering. 337 * 338 * @since 8.0 339 */ 340 // TODO: Make serialization behavior consistent. 341 @CanIgnoreReturnValue 342 @Override 343 public Builder<K, V> orderValuesBy(Comparator<? super V> valueComparator) { 344 super.orderValuesBy(valueComparator); 345 return this; 346 } 347 348 /** Returns a newly-created immutable set multimap. */ 349 @Override 350 public ImmutableSetMultimap<K, V> build() { 351 Collection<Map.Entry<K, Collection<V>>> mapEntries = builderMap.entrySet(); 352 if (keyComparator != null) { 353 mapEntries = Ordering.from(keyComparator).<K>onKeys().immutableSortedCopy(mapEntries); 354 } 355 return fromMapEntries(mapEntries, valueComparator); 356 } 357 } 358 359 /** 360 * Returns an immutable set multimap containing the same mappings as {@code multimap}. The 361 * generated multimap's key and value orderings correspond to the iteration ordering of the {@code 362 * multimap.asMap()} view. Repeated occurrences of an entry in the multimap after the first are 363 * ignored. 364 * 365 * <p>Despite the method name, this method attempts to avoid actually copying the data when it is 366 * safe to do so. The exact circumstances under which a copy will or will not be performed are 367 * undocumented and subject to change. 368 * 369 * @throws NullPointerException if any key or value in {@code multimap} is null 370 */ 371 public static <K, V> ImmutableSetMultimap<K, V> copyOf( 372 Multimap<? extends K, ? extends V> multimap) { 373 return copyOf(multimap, null); 374 } 375 376 private static <K, V> ImmutableSetMultimap<K, V> copyOf( 377 Multimap<? extends K, ? extends V> multimap, 378 @CheckForNull Comparator<? super V> valueComparator) { 379 checkNotNull(multimap); // eager for GWT 380 if (multimap.isEmpty() && valueComparator == null) { 381 return of(); 382 } 383 384 if (multimap instanceof ImmutableSetMultimap) { 385 @SuppressWarnings("unchecked") // safe since multimap is not writable 386 ImmutableSetMultimap<K, V> kvMultimap = (ImmutableSetMultimap<K, V>) multimap; 387 if (!kvMultimap.isPartialView()) { 388 return kvMultimap; 389 } 390 } 391 392 return fromMapEntries(multimap.asMap().entrySet(), valueComparator); 393 } 394 395 /** 396 * Returns an immutable multimap containing the specified entries. The returned multimap iterates 397 * over keys in the order they were first encountered in the input, and the values for each key 398 * are iterated in the order they were encountered. If two values for the same key are {@linkplain 399 * Object#equals equal}, the first value encountered is used. 400 * 401 * @throws NullPointerException if any key, value, or entry is null 402 * @since 19.0 403 */ 404 public static <K, V> ImmutableSetMultimap<K, V> copyOf( 405 Iterable<? extends Entry<? extends K, ? extends V>> entries) { 406 return new Builder<K, V>().putAll(entries).build(); 407 } 408 409 /** Creates an ImmutableSetMultimap from an asMap.entrySet. */ 410 static <K, V> ImmutableSetMultimap<K, V> fromMapEntries( 411 Collection<? extends Map.Entry<? extends K, ? extends Collection<? extends V>>> mapEntries, 412 @CheckForNull Comparator<? super V> valueComparator) { 413 if (mapEntries.isEmpty()) { 414 return of(); 415 } 416 ImmutableMap.Builder<K, ImmutableSet<V>> builder = 417 new ImmutableMap.Builder<>(mapEntries.size()); 418 int size = 0; 419 420 for (Entry<? extends K, ? extends Collection<? extends V>> entry : mapEntries) { 421 K key = entry.getKey(); 422 Collection<? extends V> values = entry.getValue(); 423 ImmutableSet<V> set = valueSet(valueComparator, values); 424 if (!set.isEmpty()) { 425 builder.put(key, set); 426 size += set.size(); 427 } 428 } 429 430 return new ImmutableSetMultimap<>(builder.buildOrThrow(), size, valueComparator); 431 } 432 433 /** 434 * Returned by get() when a missing key is provided. Also holds the comparator, if any, used for 435 * values. 436 */ 437 private final transient ImmutableSet<V> emptySet; 438 439 ImmutableSetMultimap( 440 ImmutableMap<K, ImmutableSet<V>> map, 441 int size, 442 @CheckForNull Comparator<? super V> valueComparator) { 443 super(map, size); 444 this.emptySet = emptySet(valueComparator); 445 } 446 447 // views 448 449 /** 450 * Returns an immutable set of the values for the given key. If no mappings in the multimap have 451 * the provided key, an empty immutable set is returned. The values are in the same order as the 452 * parameters used to build this multimap. 453 */ 454 @Override 455 public ImmutableSet<V> get(K key) { 456 // This cast is safe as its type is known in constructor. 457 ImmutableSet<V> set = (ImmutableSet<V>) map.get(key); 458 return MoreObjects.firstNonNull(set, emptySet); 459 } 460 461 @LazyInit @RetainedWith @CheckForNull private transient ImmutableSetMultimap<V, K> inverse; 462 463 /** 464 * {@inheritDoc} 465 * 466 * <p>Because an inverse of a set multimap cannot contain multiple pairs with the same key and 467 * value, this method returns an {@code ImmutableSetMultimap} rather than the {@code 468 * ImmutableMultimap} specified in the {@code ImmutableMultimap} class. 469 */ 470 @Override 471 public ImmutableSetMultimap<V, K> inverse() { 472 ImmutableSetMultimap<V, K> result = inverse; 473 return (result == null) ? (inverse = invert()) : result; 474 } 475 476 private ImmutableSetMultimap<V, K> invert() { 477 Builder<V, K> builder = builder(); 478 for (Entry<K, V> entry : entries()) { 479 builder.put(entry.getValue(), entry.getKey()); 480 } 481 ImmutableSetMultimap<V, K> invertedMultimap = builder.build(); 482 invertedMultimap.inverse = this; 483 return invertedMultimap; 484 } 485 486 /** 487 * Guaranteed to throw an exception and leave the multimap unmodified. 488 * 489 * @throws UnsupportedOperationException always 490 * @deprecated Unsupported operation. 491 */ 492 @CanIgnoreReturnValue 493 @Deprecated 494 @Override 495 @DoNotCall("Always throws UnsupportedOperationException") 496 public final ImmutableSet<V> removeAll(@CheckForNull Object key) { 497 throw new UnsupportedOperationException(); 498 } 499 500 /** 501 * Guaranteed to throw an exception and leave the multimap unmodified. 502 * 503 * @throws UnsupportedOperationException always 504 * @deprecated Unsupported operation. 505 */ 506 @CanIgnoreReturnValue 507 @Deprecated 508 @Override 509 @DoNotCall("Always throws UnsupportedOperationException") 510 public final ImmutableSet<V> replaceValues(K key, Iterable<? extends V> values) { 511 throw new UnsupportedOperationException(); 512 } 513 514 @LazyInit @RetainedWith @CheckForNull private transient ImmutableSet<Entry<K, V>> entries; 515 516 /** 517 * Returns an immutable collection of all key-value pairs in the multimap. Its iterator traverses 518 * the values for the first key, the values for the second key, and so on. 519 */ 520 @Override 521 public ImmutableSet<Entry<K, V>> entries() { 522 ImmutableSet<Entry<K, V>> result = entries; 523 return result == null ? (entries = new EntrySet<>(this)) : result; 524 } 525 526 private static final class EntrySet<K, V> extends ImmutableSet<Entry<K, V>> { 527 @Weak private final transient ImmutableSetMultimap<K, V> multimap; 528 529 EntrySet(ImmutableSetMultimap<K, V> multimap) { 530 this.multimap = multimap; 531 } 532 533 @Override 534 public boolean contains(@CheckForNull Object object) { 535 if (object instanceof Entry) { 536 Entry<?, ?> entry = (Entry<?, ?>) object; 537 return multimap.containsEntry(entry.getKey(), entry.getValue()); 538 } 539 return false; 540 } 541 542 @Override 543 public int size() { 544 return multimap.size(); 545 } 546 547 @Override 548 public UnmodifiableIterator<Entry<K, V>> iterator() { 549 return multimap.entryIterator(); 550 } 551 552 @Override 553 boolean isPartialView() { 554 return false; 555 } 556 557 // redeclare to help optimizers with b/310253115 558 @SuppressWarnings("RedundantOverride") 559 @Override 560 @J2ktIncompatible // serialization 561 @GwtIncompatible // serialization 562 Object writeReplace() { 563 return super.writeReplace(); 564 } 565 } 566 567 private static <V> ImmutableSet<V> valueSet( 568 @CheckForNull Comparator<? super V> valueComparator, Collection<? extends V> values) { 569 return (valueComparator == null) 570 ? ImmutableSet.copyOf(values) 571 : ImmutableSortedSet.copyOf(valueComparator, values); 572 } 573 574 private static <V> ImmutableSet<V> emptySet(@CheckForNull Comparator<? super V> valueComparator) { 575 return (valueComparator == null) 576 ? ImmutableSet.<V>of() 577 : ImmutableSortedSet.<V>emptySet(valueComparator); 578 } 579 580 private static <V> ImmutableSet.Builder<V> valuesBuilder( 581 @CheckForNull Comparator<? super V> valueComparator) { 582 return (valueComparator == null) 583 ? new ImmutableSet.Builder<V>() 584 : new ImmutableSortedSet.Builder<V>(valueComparator); 585 } 586 587 /** 588 * @serialData number of distinct keys, and then for each distinct key: the key, the number of 589 * values for that key, and the key's values 590 */ 591 @GwtIncompatible // java.io.ObjectOutputStream 592 @J2ktIncompatible 593 private void writeObject(ObjectOutputStream stream) throws IOException { 594 stream.defaultWriteObject(); 595 stream.writeObject(valueComparator()); 596 Serialization.writeMultimap(this, stream); 597 } 598 599 @CheckForNull 600 Comparator<? super V> valueComparator() { 601 return emptySet instanceof ImmutableSortedSet 602 ? ((ImmutableSortedSet<V>) emptySet).comparator() 603 : null; 604 } 605 606 @GwtIncompatible // java serialization 607 @J2ktIncompatible 608 private static final class SetFieldSettersHolder { 609 static final Serialization.FieldSetter<? super ImmutableSetMultimap<?, ?>> 610 EMPTY_SET_FIELD_SETTER = 611 Serialization.getFieldSetter(ImmutableSetMultimap.class, "emptySet"); 612 } 613 614 @GwtIncompatible // java.io.ObjectInputStream 615 @J2ktIncompatible 616 // Serialization type safety is at the caller's mercy. 617 @SuppressWarnings("unchecked") 618 private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { 619 stream.defaultReadObject(); 620 Comparator<Object> valueComparator = (Comparator<Object>) stream.readObject(); 621 int keyCount = stream.readInt(); 622 if (keyCount < 0) { 623 throw new InvalidObjectException("Invalid key count " + keyCount); 624 } 625 ImmutableMap.Builder<Object, ImmutableSet<Object>> builder = ImmutableMap.builder(); 626 int tmpSize = 0; 627 628 for (int i = 0; i < keyCount; i++) { 629 Object key = requireNonNull(stream.readObject()); 630 int valueCount = stream.readInt(); 631 if (valueCount <= 0) { 632 throw new InvalidObjectException("Invalid value count " + valueCount); 633 } 634 635 ImmutableSet.Builder<Object> valuesBuilder = valuesBuilder(valueComparator); 636 for (int j = 0; j < valueCount; j++) { 637 valuesBuilder.add(requireNonNull(stream.readObject())); 638 } 639 ImmutableSet<Object> valueSet = valuesBuilder.build(); 640 if (valueSet.size() != valueCount) { 641 throw new InvalidObjectException("Duplicate key-value pairs exist for key " + key); 642 } 643 builder.put(key, valueSet); 644 tmpSize += valueCount; 645 } 646 647 ImmutableMap<Object, ImmutableSet<Object>> tmpMap; 648 try { 649 tmpMap = builder.buildOrThrow(); 650 } catch (IllegalArgumentException e) { 651 throw (InvalidObjectException) new InvalidObjectException(e.getMessage()).initCause(e); 652 } 653 654 FieldSettersHolder.MAP_FIELD_SETTER.set(this, tmpMap); 655 FieldSettersHolder.SIZE_FIELD_SETTER.set(this, tmpSize); 656 SetFieldSettersHolder.EMPTY_SET_FIELD_SETTER.set(this, emptySet(valueComparator)); 657 } 658 659 @GwtIncompatible // not needed in emulated source. 660 @J2ktIncompatible 661 private static final long serialVersionUID = 0; 662}