edu.nps.moves.disutil.TimestampComparator Maven / Gradle / Ivy

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package edu.nps.moves.disutil;



import edu.nps.moves.dis.*;

/**
 * Uses the comparator interface to allow sorting PDUs in a collection by timestamp.
 * An example of use:
 *
 * Colletions.sort(pduList, new TimestampComparator());
 *
 * @author DMcG
 */
public class TimestampComparator 
{
    /**
     * Returns a number less than, equal to, or greater than zero,
     * depending on whether the object's timestamp less than, equal to,
     * or greater than the other object. The objects passed in must
     * inherit from PDU.
     */
    public int compare(Object object1, Object object2)
    {
        // Should exception throw here...
        if( (!(object1 instanceof Pdu)) || (!(object2 instanceof Pdu)) )
        {
            throw new RuntimeException("TimestampComparator: attempting to sort objects that are not Pdus.");
        }
            
        
        Pdu pdu1 = (Pdu)object1;
        Pdu pdu2 = (Pdu)object2;

        return (int)(pdu1.getTimestamp() - pdu2.getTimestamp());
    }

    /**
     * Returns true if this comparator is the same class as the comparator passed in.
     *
     * @param obj
     */
 @Override
 public boolean equals(Object obj)
 {
     return obj.getClass().equals(this.getClass());
 }


}