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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 2015 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.set;

import java.io.Externalizable;

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.MutableBagMultimap;
import com.gs.collections.api.multimap.set.ImmutableSetMultimap;
import com.gs.collections.api.multimap.set.MutableSetMultimap;
import com.gs.collections.api.set.ImmutableSet;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.api.tuple.Pair;
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.multimap.bag.HashBagMultimap;
import com.gs.collections.impl.set.mutable.UnifiedSet;
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 SynchronizedPutUnifiedSetMultimap
        extends AbstractSynchronizedPutMultimap> implements MutableSetMultimap, Externalizable
{
    private static final long serialVersionUID = 42L;

    public SynchronizedPutUnifiedSetMultimap()
    {
    }

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

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

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

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

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

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

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

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

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

    @Override
    protected MutableSet createCollection()
    {
        return UnifiedSet.newSet(1);
    }

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

    public MutableSetMultimap toMutable()
    {
        return new SynchronizedPutUnifiedSetMultimap(this);
    }

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

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

        return new ImmutableSetMultimapImpl(map);
    }

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

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

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

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

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

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

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