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• 1.0.0-alpha4
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• ObjectUtils.java

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com.github.apetrelli.gwtintegration.util.shared.ObjectUtils Maven / Gradle / Ivy

package com.github.apetrelli.gwtintegration.util.shared;

/**
 * Copied from Apache Commons Lang 3.1.
 * 
 * 
Operations on {@code Object}.
 *
 * 
This class tries to handle {@code null} input gracefully.
 * An exception will generally not be thrown for a {@code null} input.
 * Each method documents its behaviour in more detail.
 *
 * 
#ThreadSafe#
 * @since 1.0
 * @version $Id: ObjectUtils.java 1199894 2011-11-09 17:53:59Z ggregory $
 */
public class ObjectUtils {
	
	private ObjectUtils() {}

    /**
     * 
Null safe comparison of Comparables.
     * {@code null} is assumed to be less than a non-{@code null} value.
     *
     * @param  type of the values processed by this method
     * @param c1  the first comparable, may be null
     * @param c2  the second comparable, may be null
     * @return a negative value if c1 < c2, zero if c1 = c2
     *  and a positive value if c1 > c2
     */
    public static > int compare(T c1, T c2) {
        return compare(c1, c2, false);
    }

    /**
     * 
Null safe comparison of Comparables.
     *
     * @param  type of the values processed by this method
     * @param c1  the first comparable, may be null
     * @param c2  the second comparable, may be null
     * @param nullGreater if true {@code null} is considered greater
     *  than a non-{@code null} value or if false {@code null} is
     *  considered less than a Non-{@code null} value
     * @return a negative value if c1 < c2, zero if c1 = c2
     *  and a positive value if c1 > c2
     * @see java.util.Comparator#compare(Object, Object)
     */
    public static > int compare(T c1, T c2, boolean nullGreater) {
        if (c1 == c2) {
            return 0;
        } else if (c1 == null) {
            return nullGreater ? 1 : -1;
        } else if (c2 == null) {
            return nullGreater ? -1 : 1;
        }
        return c1.compareTo(c2);
    }
	
}