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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.lazy.parallel;

import com.gs.collections.api.ParallelIterable;
import com.gs.collections.api.annotation.Beta;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.multimap.bag.MutableBagMultimap;
import com.gs.collections.api.multimap.bag.UnsortedBagMultimap;
import com.gs.collections.api.set.ParallelUnsortedSetIterable;
import com.gs.collections.impl.block.factory.Functions;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.lazy.parallel.set.ParallelCollectIterable;
import com.gs.collections.impl.lazy.parallel.set.ParallelFlatCollectIterable;
import com.gs.collections.impl.multimap.bag.SynchronizedPutHashBagMultimap;

@Beta
public abstract class AbstractParallelIterableImpl> extends AbstractParallelIterable
{
    @Override
    protected boolean isOrdered()
    {
        return false;
    }

    public ParallelUnsortedSetIterable asUnique()
    {
        return new ParallelDistinctIterable(this);
    }

    public ParallelIterable select(Predicate predicate)
    {
        return new ParallelSelectIterable(this, predicate);
    }

    public  ParallelIterable selectWith(Predicate2 predicate, P parameter)
    {
        return this.select(Predicates.bind(predicate, parameter));
    }

    public  ParallelIterable selectInstancesOf(Class clazz)
    {
        return (ParallelIterable) this.select(Predicates.instanceOf(clazz));
    }

    public ParallelIterable reject(Predicate predicate)
    {
        return this.select(Predicates.not(predicate));
    }

    public  ParallelIterable rejectWith(Predicate2 predicate, P parameter)
    {
        return this.reject(Predicates.bind(predicate, parameter));
    }

    public  ParallelIterable collect(Function function)
    {
        return new ParallelCollectIterable(this, function);
    }

    public  ParallelIterable collectWith(Function2 function, P parameter)
    {
        return this.collect(Functions.bind(function, parameter));
    }

    public  ParallelIterable collectIf(Predicate predicate, Function function)
    {
        return this.select(predicate).collect(function);
    }

    public  ParallelIterable flatCollect(Function> function)
    {
        return new ParallelFlatCollectIterable(this, function);
    }

    public  UnsortedBagMultimap groupBy(final Function function)
    {
        final MutableBagMultimap result = SynchronizedPutHashBagMultimap.newMultimap();
        this.forEach(new Procedure()
        {
            public void value(T each)
            {
                V key = function.valueOf(each);
                result.put(key, each);
            }
        });
        return result;
    }

    public  UnsortedBagMultimap groupByEach(final Function> function)
    {
        final MutableBagMultimap result = SynchronizedPutHashBagMultimap.newMultimap();
        this.forEach(new Procedure()
        {
            public void value(T each)
            {
                Iterable keys = function.valueOf(each);
                for (V key : keys)
                {
                    result.put(key, each);
                }
            }
        });
        return result;
    }
}