MinFilterN.java

/**
 * MinFilterN extends ComparableFilterN, setting the compare function
 * such that if the current input is less than the previous (via
 * compareTo() function), it returns true.
 * @author gmh73
 *
 * @param <T>
 */
public class MinFilterN<T extends Comparable<T>> extends CompareFilterN<T> {
	
	/**
	 * Builds a MinFilterN that remembers n inputs.
	 * @param n		The number of inputs the filter will remember
	 */
	public MinFilterN(int n) {
		super(n);
	}
	
	/**
	 * Returns true if left < right.
	 * In this case, a null value is interpreted as
	 * a max value, so if right is null and left is anything but null,
	 * true is returned.
	 * If left and right are both null, false is returned.
	 */
	@Override
	public boolean compare(T left, T right) {
		return right == null || (left != null && left.compareTo(right) <= 0);
	}
}