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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
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/*
 * Copyright 2014 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.impl.multimap.bag;

import java.io.Externalizable;

import com.gs.collections.api.bag.ImmutableBag;
import com.gs.collections.api.bag.MutableBag;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.Multimap;
import com.gs.collections.api.multimap.bag.ImmutableBagMultimap;
import com.gs.collections.api.multimap.bag.MutableBagMultimap;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.bag.mutable.HashBag;
import com.gs.collections.impl.map.mutable.ConcurrentHashMap;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.multimap.AbstractSynchronizedPutMultimap;
import com.gs.collections.impl.utility.ArrayIterate;
import com.gs.collections.impl.utility.Iterate;

/**
 * A Multimap that is optimized for parallel writes, but is not protected for concurrent reads.
 */
public final class SynchronizedPutHashBagMultimap
        extends AbstractSynchronizedPutMultimap> implements MutableBagMultimap, Externalizable
{
    private static final long serialVersionUID = 42L;

    public SynchronizedPutHashBagMultimap()
    {
    }

    public SynchronizedPutHashBagMultimap(int initialCapacity)
    {
        super(ConcurrentHashMap.>newMap(initialCapacity));
    }

    public SynchronizedPutHashBagMultimap(Multimap multimap)
    {
        this.putAll(multimap);
    }

    public SynchronizedPutHashBagMultimap(Pair... pairs)
    {
        ArrayIterate.forEach(pairs, new Procedure>()
        {
            public void value(Pair pair)
            {
                SynchronizedPutHashBagMultimap.this.put(pair.getOne(), pair.getTwo());
            }
        });
    }

    public SynchronizedPutHashBagMultimap(Iterable> inputIterable)
    {
        Iterate.forEach(inputIterable, new Procedure>()
        {
            public void value(Pair pair)
            {
                SynchronizedPutHashBagMultimap.this.add(pair);
            }
        });
    }

    public static  SynchronizedPutHashBagMultimap newMultimap()
    {
        return new SynchronizedPutHashBagMultimap();
    }

    public static  SynchronizedPutHashBagMultimap newMultimap(int initialCapacity, float loadFactor, int concurrencyLevel)
    {
        return new SynchronizedPutHashBagMultimap(initialCapacity);
    }

    public static  SynchronizedPutHashBagMultimap newMultimap(Multimap multimap)
    {
        return new SynchronizedPutHashBagMultimap(multimap);
    }

    public static  SynchronizedPutHashBagMultimap newMultimap(Pair... pairs)
    {
        return new SynchronizedPutHashBagMultimap(pairs);
    }

    public static  SynchronizedPutHashBagMultimap newMultimap(Iterable> inputIterable)
    {
        return new SynchronizedPutHashBagMultimap(inputIterable);
    }

    @Override
    protected MutableBag createCollection()
    {
        return HashBag.newBag(1);
    }

    public SynchronizedPutHashBagMultimap newEmpty()
    {
        return new SynchronizedPutHashBagMultimap();
    }

    public MutableBagMultimap toMutable()
    {
        return new SynchronizedPutHashBagMultimap(this);
    }

    public ImmutableBagMultimap toImmutable()
    {
        final MutableMap> map = UnifiedMap.newMap();

        this.map.forEachKeyValue(new Procedure2>()
        {
            public void value(K key, MutableBag bag)
            {
                map.put(key, bag.toImmutable());
            }
        });

        return new ImmutableBagMultimapImpl(map);
    }

    public HashBagMultimap selectKeysValues(Predicate2 predicate)
    {
        return this.selectKeysValues(predicate, HashBagMultimap.newMultimap());
    }

    public HashBagMultimap rejectKeysValues(Predicate2 predicate)
    {
        return this.rejectKeysValues(predicate, HashBagMultimap.newMultimap());
    }

    public HashBagMultimap selectKeysMultiValues(Predicate2> predicate)
    {
        return this.selectKeysMultiValues(predicate, HashBagMultimap.newMultimap());
    }

    public HashBagMultimap rejectKeysMultiValues(Predicate2> predicate)
    {
        return this.rejectKeysMultiValues(predicate, HashBagMultimap.newMultimap());
    }

    public  HashBagMultimap collectKeysValues(Function2> function)
    {
        return this.collectKeysValues(function, HashBagMultimap.newMultimap());
    }

    public  HashBagMultimap collectValues(Function function)
    {
        return this.collectValues(function, HashBagMultimap.newMultimap());
    }

    public MutableBagMultimap flip()
    {
        return Iterate.flip(this);
    }

    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 bag = this.map.getIfAbsentPutWith(key, this.createCollectionBlock(), this);

            synchronized (bag)
            {
                bag.addOccurrences(value, occurrences);
                this.addToTotalSize(occurrences);
            }
        }
    }
}