Generic Comparator Structure with Native assertions (example Integer)

GenericComparator.java

package examples.algorithms;

import com.google.common.base.Stopwatch;

/**
 * Generic Comparator with native assertions for Integers
 * 
 * @author Andre Luis de Oliveira Dias (https://about.me/andreluisdias)
 * @since 30 de set de 2017
 */
public class GenericComparator {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		GenericComparator tester = new GenericComparator();
		
		/*
		 * Use JVM -ea hint to turn all below
		 */

		Stopwatch sw = Stopwatch.createStarted();
		
		assert (tester.validateInteger(1, 1) == true);
		assert (tester.validateInteger(1, 10) == false);
		assert (tester.validateInteger(1, "") == false);
		assert (tester.validateInteger(1, "1") == false);
		assert (tester.validateInteger("", 1) == false);
		assert (tester.validateInteger("", "") == false);
		assert (tester.validateInteger("1", "1") == false);
		sw.stop();

		System.out.println(String.format("Total elapsed: %s", sw));
	}

	/*
	 * NULL-SAFE
	 */
	private boolean validateInteger(final Object i1, final Object i2)  {
		
		if (!this.validateClassAgainst(i1, i2, Integer.class)) return false; // Class validation

		if (i1 == i2) return true; // Pointer validation
		
		return (((Integer)i1).intValue() == ((Integer)i2).intValue()); // Specific implementation validation
	}
	
	private boolean validateClassAgainst(final Object o1, final Object o2, final Class<?> clazz) {
		
		if (o1 == null) return false;
		if (o2 == null) return false;
		
		if (
				!o1.getClass().equals(clazz)
				|| 
				!o2.getClass().equals(clazz)
			){
			
			return false;
		}
		
		return true;
	}
}

StopWatch added