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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 com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.map.MutableMap;
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.UnifiedMap;
import com.gs.collections.impl.multimap.AbstractMutableMultimap;
import com.gs.collections.impl.multimap.bag.HashBagMultimap;

public abstract class AbstractMutableSetMultimap extends AbstractMutableMultimap> implements MutableSetMultimap
{
    protected AbstractMutableSetMultimap()
    {
    }

    protected AbstractMutableSetMultimap(Pair... pairs)
    {
        super(pairs);
    }

    protected AbstractMutableSetMultimap(Iterable> inputIterable)
    {
        super(inputIterable);
    }

    protected AbstractMutableSetMultimap(int size)
    {
        super(size);
    }

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

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