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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.lazy.parallel;

import java.util.Comparator;

import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.primitive.DoubleFunction;
import com.gs.collections.api.block.function.primitive.FloatFunction;
import com.gs.collections.api.block.function.primitive.IntFunction;
import com.gs.collections.api.block.function.primitive.LongFunction;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.impl.block.procedure.CountProcedure;
import com.gs.collections.impl.block.procedure.DoubleSumResultHolder;
import com.gs.collections.impl.block.procedure.MaxByProcedure;
import com.gs.collections.impl.block.procedure.MaxComparatorProcedure;
import com.gs.collections.impl.block.procedure.MinByProcedure;
import com.gs.collections.impl.block.procedure.MinComparatorProcedure;
import com.gs.collections.impl.block.procedure.SumOfDoubleProcedure;
import com.gs.collections.impl.block.procedure.SumOfFloatProcedure;
import com.gs.collections.impl.block.procedure.SumOfIntProcedure;
import com.gs.collections.impl.block.procedure.SumOfLongProcedure;

public abstract class AbstractBatch implements Batch
{
    public int count(Predicate predicate)
    {
        CountProcedure procedure = new CountProcedure(predicate);
        this.forEach(procedure);
        return procedure.getCount();
    }

    public String makeString(final String separator)
    {
        final StringBuilder stringBuilder = new StringBuilder();
        this.forEach(new Procedure()
        {
            public void value(T each)
            {
                if (stringBuilder.length() != 0)
                {
                    stringBuilder.append(separator);
                }
                stringBuilder.append(each);
            }
        });
        return stringBuilder.toString();
    }

    public T min(Comparator comparator)
    {
        MinComparatorProcedure procedure = new MinComparatorProcedure(comparator);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    public T max(Comparator comparator)
    {
        MaxComparatorProcedure procedure = new MaxComparatorProcedure(comparator);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    public > T minBy(Function function)
    {
        MinByProcedure procedure = new MinByProcedure(function);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    public > T maxBy(Function function)
    {
        MaxByProcedure procedure = new MaxByProcedure(function);
        this.forEach(procedure);
        return procedure.isVisitedAtLeastOnce() ? procedure.getResult() : null;
    }

    public long sumOfInt(IntFunction function)
    {
        SumOfIntProcedure procedure = new SumOfIntProcedure(function);
        this.forEach(procedure);
        return procedure.getResult();
    }

    public DoubleSumResultHolder sumOfFloat(FloatFunction function)
    {
        SumOfFloatProcedure procedure = new SumOfFloatProcedure(function);
        this.forEach(procedure);
        return procedure;
    }

    public long sumOfLong(LongFunction function)
    {
        SumOfLongProcedure procedure = new SumOfLongProcedure(function);
        this.forEach(procedure);
        return procedure.getResult();
    }

    public DoubleSumResultHolder sumOfDouble(DoubleFunction function)
    {
        SumOfDoubleProcedure procedure = new SumOfDoubleProcedure(function);
        this.forEach(procedure);
        return procedure;
    }
}