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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 java.io.Serializable;

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.map.ImmutableMap;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.bag.ImmutableBagMultimap;
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.factory.Maps;
import com.gs.collections.impl.factory.Sets;
import com.gs.collections.impl.multimap.AbstractImmutableMultimap;
import com.gs.collections.impl.multimap.AbstractMutableMultimap;
import com.gs.collections.impl.multimap.ImmutableMultimapSerializationProxy;
import com.gs.collections.impl.multimap.bag.HashBagMultimap;
import com.gs.collections.impl.utility.Iterate;

/**
 * The default ImmutableBagMultimap implementation.
 *
 * @since 1.0
 */
public final class ImmutableSetMultimapImpl
        extends AbstractImmutableMultimap>
        implements ImmutableSetMultimap, Serializable
{
    private static final long serialVersionUID = 1L;

    public ImmutableSetMultimapImpl(MutableMap> map)
    {
        super(map);
    }

    public ImmutableSetMultimapImpl(ImmutableMap> map)
    {
        super(map);
    }

    @Override
    protected ImmutableSet createCollection()
    {
        return Sets.immutable.empty();
    }

    public ImmutableSetMultimap newEmpty()
    {
        return new ImmutableSetMultimapImpl(Maps.immutable.>with());
    }

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

    @Override
    public ImmutableSetMultimap toImmutable()
    {
        return this;
    }

    private Object writeReplace()
    {
        return new ImmutableSetMultimapSerializationProxy(this.map);
    }

    private static final class ImmutableSetMultimapSerializationProxy
            extends ImmutableMultimapSerializationProxy> implements Externalizable
    {
        private static final long serialVersionUID = 1L;

        @SuppressWarnings("UnusedDeclaration")
        public ImmutableSetMultimapSerializationProxy()
        {
            // For Externalizable use only
        }

        private ImmutableSetMultimapSerializationProxy(ImmutableMap> map)
        {
            super(map);
        }

        @Override
        protected AbstractMutableMultimap> createEmptyMutableMultimap()
        {
            return new UnifiedSetMultimap();
        }
    }

    @Override
    public ImmutableSetMultimap newWith(K key, V value)
    {
        return (ImmutableSetMultimap) super.newWith(key, value);
    }

    @Override
    public ImmutableSetMultimap newWithout(Object key, Object value)
    {
        return (ImmutableSetMultimap) super.newWithout(key, value);
    }

    @Override
    public ImmutableSetMultimap newWithAll(K key, Iterable values)
    {
        return (ImmutableSetMultimap) super.newWithAll(key, values);
    }

    @Override
    public ImmutableSetMultimap newWithoutAll(Object key)
    {
        return (ImmutableSetMultimap) super.newWithoutAll(key);
    }

    public ImmutableSetMultimap flip()
    {
        return Iterate.flip(this).toImmutable();
    }

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

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

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

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

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

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