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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 2011 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.strategy;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

import com.gs.collections.api.block.HashingStrategy;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.Multimap;
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.UnifiedMap;
import com.gs.collections.impl.multimap.AbstractMutableMultimap;
import com.gs.collections.impl.multimap.set.ImmutableSetMultimapImpl;
import com.gs.collections.impl.set.strategy.mutable.UnifiedSetWithHashingStrategy;

public final class UnifiedSetWithHashingStrategyMultimap
        extends AbstractMutableMultimap>
        implements MutableSetMultimap, Externalizable
{
    private static final long serialVersionUID = 1L;
    private HashingStrategy hashingStrategy;

    /**
     * @deprecated Empty default constructor used for serialization. Instantiating an UnifiedSetWithHashingStrategyMultimap with
     *             this constructor will have a null hashingStrategy and throw NullPointerException when used.
     */
    @SuppressWarnings("UnusedDeclaration")
    @Deprecated
    public UnifiedSetWithHashingStrategyMultimap()
    {
        // For Externalizable use only
    }

    public UnifiedSetWithHashingStrategyMultimap(HashingStrategy hashingStrategy)
    {
        this.hashingStrategy = hashingStrategy;
    }

    public UnifiedSetWithHashingStrategyMultimap(UnifiedSetWithHashingStrategyMultimap multimap)
    {
        this(multimap.hashingStrategy, multimap);
    }

    public UnifiedSetWithHashingStrategyMultimap(HashingStrategy hashingStrategy, Multimap multimap)
    {
        super(Math.max(multimap.sizeDistinct() * 2, 16));
        this.hashingStrategy = hashingStrategy;
        this.putAll(multimap);
    }

    public UnifiedSetWithHashingStrategyMultimap(HashingStrategy hashingStrategy, Pair... pairs)
    {
        this.hashingStrategy = hashingStrategy;
        this.putAllPairs(pairs);
    }

    public static  UnifiedSetWithHashingStrategyMultimap newMultimap(UnifiedSetWithHashingStrategyMultimap multimap)
    {
        return new UnifiedSetWithHashingStrategyMultimap(multimap);
    }

    public static  UnifiedSetWithHashingStrategyMultimap newMultimap(HashingStrategy hashingStrategy,
            Multimap multimap)
    {
        return new UnifiedSetWithHashingStrategyMultimap(hashingStrategy, multimap);
    }

    public static  UnifiedSetWithHashingStrategyMultimap newMultimap(HashingStrategy hashingStrategy)
    {
        return new UnifiedSetWithHashingStrategyMultimap(hashingStrategy);
    }

    public static  UnifiedSetWithHashingStrategyMultimap newMultimap(HashingStrategy hashingStrategy, Pair... pairs)
    {
        return new UnifiedSetWithHashingStrategyMultimap(hashingStrategy, pairs);
    }

    @Override
    protected MutableMap> createMap()
    {
        return UnifiedMap.newMap();
    }

    @Override
    protected MutableMap> createMapWithKeyCount(int keyCount)
    {
        return UnifiedMap.newMap(keyCount);
    }

    @Override
    protected UnifiedSetWithHashingStrategy createCollection()
    {
        return UnifiedSetWithHashingStrategy.newSet(this.hashingStrategy);
    }

    public UnifiedSetWithHashingStrategyMultimap newEmpty()
    {
        return new UnifiedSetWithHashingStrategyMultimap(this.hashingStrategy);
    }

    public HashingStrategy getValueHashingStrategy()
    {
        return this.hashingStrategy;
    }

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

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

        this.map.collectValues(new Function2, Object>()
        {
            public Object value(K key, MutableSet set)
            {
                return map.put(key, set.toImmutable());
            }
        });
        return new ImmutableSetMultimapImpl(map);
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException
    {
        out.writeObject(this.hashingStrategy);
        super.writeExternal(out);
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
    {
        this.hashingStrategy = (HashingStrategy) in.readObject();
        super.readExternal(in);
    }
}