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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 2011 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.block.function;

import com.gs.collections.api.block.function.Function2;

/**
 * MinFunction contains iterator aware implementations of Min() for integers, doubles, and longs.
 */
public final class MinFunction
{
    public static final Function2 INTEGER = new MinIntegerFunction();
    public static final Function2 DOUBLE = new MinDoubleFunction();
    public static final Function2 LONG = new MinLongFunction();

    private MinFunction()
    {
        throw new AssertionError("Suppress default constructor for noninstantiability");
    }

    private static class MinIntegerFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Integer value(Integer argument1, Integer argument2)
        {
            if (argument1 == null)
            {
                return argument2;
            }
            if (argument2 == null)
            {
                return argument1;
            }
            return argument1.intValue() < argument2.intValue() ? argument1 : argument2;
        }
    }

    private static class MinDoubleFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Double value(Double argument1, Double argument2)
        {
            if (argument1 == null)
            {
                return argument2;
            }
            if (argument2 == null)
            {
                return argument1;
            }
            return argument1.doubleValue() < argument2.doubleValue() ? argument1 : argument2;
        }
    }

    private static class MinLongFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Long value(Long argument1, Long argument2)
        {
            if (argument1 == null)
            {
                return argument2;
            }
            if (argument2 == null)
            {
                return argument1;
            }
            return argument1.longValue() < argument2.longValue() ? argument1 : argument2;
        }
    }
}