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    • ch.inftec.ju.util.comparison.DefaultComparator Maven / Gradle / Ivy

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    package ch.inftec.ju.util.comparison;

import java.util.Comparator;

import org.apache.commons.lang3.ObjectUtils;


/**
 * Default implementation of an EqualityTester and Comparator. Uses the objects
 * equals and compareTo methods to perform the tests. Includes null comparison
 * where null is considered to be smaller as any instance.
 * @author tgdmemae
 *
 * @param  Base type
 */
public class DefaultComparator implements EqualityTester, Comparator {
	/**
	 * Default instance of an object comparator.
	 */
	public static DefaultComparator INSTANCE = new DefaultComparator();
	
	@Override	
	public int compare(T o1, T o2) {
		// Handle nulls (null is considered smaller than an instance
		if (o1 == null && o2 == null) return 0;
		if (o1 == null || o2 == null) return o1 == null ? -1 : 1;
		
		// Compare objects (will throw ClassCastException if object 1 doesn't
		// implement Comparable interface
		@SuppressWarnings("unchecked")
		Comparable c1 = (Comparable)o1;
		return c1.compareTo(o2);
	}

	@Override
	public boolean equals(T o1, T o2) {
		return ObjectUtils.equals(o1, o2);
	}
}
    
    
    
    

    




    
    
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