/*
 * Copyright (c) 2016 Goldman Sachs and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.impl.multimap.bag;

import java.io.Externalizable;

import org.eclipse.collections.api.bag.ImmutableBag;
import org.eclipse.collections.api.bag.MutableBag;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.Function2;
import org.eclipse.collections.api.block.predicate.Predicate2;
import org.eclipse.collections.api.map.MutableMap;
import org.eclipse.collections.api.multimap.Multimap;
import org.eclipse.collections.api.multimap.bag.ImmutableBagMultimap;
import org.eclipse.collections.api.multimap.bag.MutableBagMultimap;
import org.eclipse.collections.api.tuple.Pair;
import org.eclipse.collections.impl.bag.mutable.HashBag;
import org.eclipse.collections.impl.map.mutable.ConcurrentHashMap;
import org.eclipse.collections.impl.map.mutable.UnifiedMap;
import org.eclipse.collections.impl.multimap.AbstractSynchronizedPutMultimap;
import org.eclipse.collections.impl.utility.ArrayIterate;
import org.eclipse.collections.impl.utility.Iterate;

A Multimap that is optimized for parallel writes, but is not protected for concurrent reads.
/** * A Multimap that is optimized for parallel writes, but is not protected for concurrent reads. */
public final class SynchronizedPutHashBagMultimap<K, V> extends AbstractSynchronizedPutMultimap<K, V, MutableBag<V>> implements MutableBagMultimap<K, V>, Externalizable { private static final long serialVersionUID = 42L; public SynchronizedPutHashBagMultimap() { } public SynchronizedPutHashBagMultimap(int initialCapacity) { super(ConcurrentHashMap.newMap(initialCapacity)); } public SynchronizedPutHashBagMultimap(Multimap<? extends K, ? extends V> multimap) { this.putAll(multimap); } public SynchronizedPutHashBagMultimap(Pair<K, V>... pairs) { ArrayIterate.forEach(pairs, pair -> this.put(pair.getOne(), pair.getTwo())); } public SynchronizedPutHashBagMultimap(Iterable<Pair<K, V>> inputIterable) { Iterate.forEach(inputIterable, this::add); } public static <K, V> SynchronizedPutHashBagMultimap<K, V> newMultimap() { return new SynchronizedPutHashBagMultimap<>(); } public static <K, V> SynchronizedPutHashBagMultimap<K, V> newMultimap(int initialCapacity, float loadFactor, int concurrencyLevel) { return new SynchronizedPutHashBagMultimap<>(initialCapacity); } public static <K, V> SynchronizedPutHashBagMultimap<K, V> newMultimap(Multimap<? extends K, ? extends V> multimap) { return new SynchronizedPutHashBagMultimap<>(multimap); } public static <K, V> SynchronizedPutHashBagMultimap<K, V> newMultimap(Pair<K, V>... pairs) { return new SynchronizedPutHashBagMultimap<>(pairs); } public static <K, V> SynchronizedPutHashBagMultimap<K, V> newMultimap(Iterable<Pair<K, V>> inputIterable) { return new SynchronizedPutHashBagMultimap<>(inputIterable); } @Override protected MutableBag<V> createCollection() { return HashBag.newBag(1); } @Override public SynchronizedPutHashBagMultimap<K, V> newEmpty() { return new SynchronizedPutHashBagMultimap<>(); } @Override public MutableBagMultimap<K, V> toMutable() { return new SynchronizedPutHashBagMultimap<>(this); } @Override public ImmutableBagMultimap<K, V> toImmutable() { MutableMap<K, ImmutableBag<V>> map = UnifiedMap.newMap(); this.map.forEachKeyValue((key, bag) -> map.put(key, bag.toImmutable())); return new ImmutableBagMultimapImpl<>(map); } @Override public HashBagMultimap<K, V> selectKeysValues(Predicate2<? super K, ? super V> predicate) { return this.selectKeysValues(predicate, HashBagMultimap.newMultimap()); } @Override public HashBagMultimap<K, V> rejectKeysValues(Predicate2<? super K, ? super V> predicate) { return this.rejectKeysValues(predicate, HashBagMultimap.newMultimap()); } @Override public HashBagMultimap<K, V> selectKeysMultiValues(Predicate2<? super K, ? super Iterable<V>> predicate) { return this.selectKeysMultiValues(predicate, HashBagMultimap.newMultimap()); } @Override public HashBagMultimap<K, V> rejectKeysMultiValues(Predicate2<? super K, ? super Iterable<V>> predicate) { return this.rejectKeysMultiValues(predicate, HashBagMultimap.newMultimap()); } @Override public <K2, V2> HashBagMultimap<K2, V2> collectKeysValues(Function2<? super K, ? super V, Pair<K2, V2>> function) { return this.collectKeysValues(function, HashBagMultimap.newMultimap()); } @Override public <V2> HashBagMultimap<K, V2> collectValues(Function<? super V, ? extends V2> function) { return this.collectValues(function, HashBagMultimap.newMultimap()); } @Override public MutableBagMultimap<V, K> flip() { return Iterate.flip(this); } @Override public void putOccurrences(K key, V value, int occurrences) { if (occurrences < 0) { throw new IllegalArgumentException("Cannot add a negative number of occurrences"); } if (occurrences > 0) { MutableBag<V> bag = this.map.getIfAbsentPutWith(key, this.createCollectionBlock(), this); synchronized (bag) { bag.addOccurrences(value, occurrences); this.addToTotalSize(occurrences); } } } @Override public MutableBagMultimap<K, V> asSynchronized() { throw new UnsupportedOperationException("Cannot call asSynchronized() on " + this.getClass().getSimpleName()); } }