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SynchronizedPutHashBagMultimap.java
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SynchronizedPutHashBagMultimap.java
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/*
* Copyright (c) 2019 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.
*/
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 <K2, V2> MutableBagMultimap<K2, V2> collectKeyMultiValues(Function<? super K, ? extends K2> keyFunction, Function<? super V, ? extends V2> valueFunction)
{
return this.collectKeyMultiValues(keyFunction, valueFunction, 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());
}
}