/**
 * Write a description of class Domino here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Domino
{
    // number of spots on left end of the domino
    private int leftSpots;

    // number of spots on left end of the domino
    private int rightSpots;
    
    // value of this domino (depends on the game being played)
    private int value;
    
    /**
     * Constant denoting a single spot
     */
    public static final int ONE = 1;
    
    /**
     * Constant denoting the text label for a single spot on one end.
     */
    public static final String ONE_LABEL = "One";

    /**
     * The primary constructor that creates a new domino with the specified
     * number of spots on each end.
     * @param numSpots1 the non-negative number of spots on one end of the domino
     * @param numSpots2 the non-negative number of spots on the other end of the domino
     */
    public Domino(int lSpots, int rSpots)
    {
        // assign the specified parameters to the corresponding instance variables
        // if either given value is negative set to -1 as a signal of bad value
        if (lSpots < 0 || rSpots < 0)
        {
            leftSpots = -1;
            rightSpots = -1;
            //again we use -1 as a signal of bad domino
            value = -1;
            
        }
        else
        {
            leftSpots = lSpots;
            rightSpots = rSpots;
            value = leftSpots + rightSpots;
        }
    }
    
    /**
     * Checks whether the domino supplied as a paramter has an end that matches either end of the domino
     * from which the method is called.
     * 
     * @param domino a domino to evaluate for a matching end
     * @return True if the two dominoes have an end with the same number of spots, otherwise false.
     */
    public boolean isMatch(Domino dom)
    {
        //check to make sure the paramter isn't null
        if (dom == null)
            return false;

        //  check for equality in the four possible cases of a match and return true if any is true
        if (this.leftSpots == dom.leftSpots || this.leftSpots == dom.rightSpots ||
            this.rightSpots == dom.leftSpots || this.rightSpots == dom.rightSpots)
            return true;
        else return false;
    }
}