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/*
 * Copyright (c) 2021 Goldman Sachs.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.impl.block.function;

import org.eclipse.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;

        @Override
        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;

        @Override
        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;

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