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    • ch.lambdaj.function.compare.ComparatorUtil Maven / Gradle / Ivy

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    // Modified or written by Ex Machina SAGL for inclusion with lambdaj.
// Copyright (c) 2009 Mario Fusco.
// Licensed under the Apache License, Version 2.0 (the "License")

package ch.lambdaj.function.compare;

import java.io.*;
import java.util.*;

/**
 * Some utilities methods to compare two objects.
 * @author Mario Fusco
 */
public final class ComparatorUtil {

    private ComparatorUtil() { }

    /**
     * Compares 2 objects in a null safe way
     * @param o1 The first object to be compared
     * @param o2 The second object to be compared
     * @return A positive number if the first object is bigger than the second, a negative if is lesser or zero if they are equal
     */
    public static int nullSafeCompare(Object o1, Object o2) {
        return nullSafeCompare(DEFAULT_ARGUMENT_COMPARATOR, o1, o2);
    }

    static int nullSafeCompare(Comparator comparator, Object o1, Object o2) {
        if (o1 == null) return o2 == null ? 0 : 1;
        return o2 == null ? -1 : comparator.compare(o1, o2);
    }

	static final Comparator DEFAULT_ARGUMENT_COMPARATOR = new DefaultArgumentComparator();

	static class DefaultArgumentComparator implements Comparator, Serializable {
        /**
         * {@inheritDoc}
         */
        @SuppressWarnings("unchecked")
		public int compare(Object val1, Object val2) {
			return val1 != null ? ((Comparable)val1).compareTo(val2) : -((Comparable)val2).compareTo(null);
		}
	}
}
    
    
    
    

    




    
    
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