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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.MutableBag;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.predicate.Predicate2;
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.tuple.Pair;
import com.gs.collections.impl.bag.mutable.HashBag;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.utility.Iterate;

public final class HashBagMultimap
        extends AbstractMutableBagMultimap implements Externalizable
{
    private static final long serialVersionUID = 1L;

    public HashBagMultimap()
    {
    }

    public HashBagMultimap(Multimap multimap)
    {
        super(Math.max(multimap.keysView().size() * 2, 16));
        this.putAll(multimap);
    }

    public HashBagMultimap(Pair... pairs)
    {
        super(pairs);
    }

    public HashBagMultimap(Iterable> inputIterable)
    {
        super(inputIterable);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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