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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 java.util.concurrent.ExecutorService;

import com.gs.collections.api.LazyIterable;
import com.gs.collections.api.annotation.Beta;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.block.procedure.IfProcedure;

@Beta
public class ParallelSelectIterable extends AbstractParallelIterableImpl>
{
    private final AbstractParallelIterable> parallelIterable;
    private final Predicate predicate;

    public ParallelSelectIterable(AbstractParallelIterable> parallelIterable, Predicate predicate)
    {
        this.parallelIterable = parallelIterable;
        this.predicate = predicate;
    }

    @Override
    public ExecutorService getExecutorService()
    {
        return this.parallelIterable.getExecutorService();
    }

    @Override
    public int getBatchSize()
    {
        return this.parallelIterable.getBatchSize();
    }

    @Override
    public LazyIterable> split()
    {
        return this.parallelIterable.split().collect(new Function, Batch>()
        {
            public Batch valueOf(Batch eachBatch)
            {
                return eachBatch.select(ParallelSelectIterable.this.predicate);
            }
        });
    }

    public void forEach(Procedure procedure)
    {
        this.parallelIterable.forEach(new IfProcedure(this.predicate, procedure));
    }

    public boolean anySatisfy(Predicate predicate)
    {
        return this.parallelIterable.anySatisfy(Predicates.and(this.predicate, predicate));
    }

    public boolean allSatisfy(Predicate predicate)
    {
        return this.parallelIterable.allSatisfy(new SelectAllSatisfyPredicate(this.predicate, predicate));
    }

    public T detect(Predicate predicate)
    {
        return this.parallelIterable.detect(Predicates.and(this.predicate, predicate));
    }

    @Override
    public Object[] toArray()
    {
        // TODO: Implement in parallel
        return this.parallelIterable.toList().select(this.predicate).toArray();
    }

    @Override
    public  E[] toArray(E[] array)
    {
        // TODO: Implement in parallel
        return this.parallelIterable.toList().select(this.predicate).toArray(array);
    }

    private static final class SelectAllSatisfyPredicate implements Predicate
    {
        private final Predicate left;
        private final Predicate right;

        private SelectAllSatisfyPredicate(Predicate left, Predicate right)
        {
            this.left = left;
            this.right = right;
        }

        public boolean accept(T each)
        {
            boolean leftResult = this.left.accept(each);
            return !leftResult || this.right.accept(each);
        }
    }
}