b_nonzero_s.java

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/*
 * b_NonZero_s.java
 */

package EDU.gatech.cc.is.clay;

import java.lang.*;

/**
 * Return true if the value of embedded node is non-zero.
 * <P>
 * For detailed information on how to configure behaviors, see the
 * <A HREF="../clay/docs/index.html">Clay page</A>.
 * <P>
 * <A HREF="../COPYRIGHT.html">Copyright</A>
 * (c)1997, 1998 Tucker Balch
 *
 * @author Tucker Balch
 * @version $Revision: 1.1 $
 */


public class b_NonZero_s extends NodeBoolean
	{
	/** 
	Turn debug printing on or off.
	*/
	public static final boolean DEBUG = Node.DEBUG;
	private NodeScalar embedded1;

	/**
	Instantiate a b_NonZero_s schema.
	@param im1 NodeScalar the embedded node that generates a scalar
			to be detected if non zero.
	*/
	public b_NonZero_s(NodeScalar im1)
		{
		if (DEBUG) System.out.println("b_NonZero_s: instantiated.");
		embedded1 = im1;
		}

	boolean	last_val = false;
	long	lasttime = 0;
	/**
	Return a boolean indicating if the embedded node
	output is NonZero.
	@param timestamp long, only get new information if timestamp > than last call
                or timestamp == -1.
	@return true if NonZero, false if not.
	*/
	public boolean Value(long timestamp)
		{
                if (DEBUG) System.out.println("b_NonZero_s: Value()");
 
                if ((timestamp > lasttime)||(timestamp == -1))
                        {
                        /*--- reset the timestamp ---*/
                        if (timestamp > 0) lasttime = timestamp;
 
                        /*--- compute the output ---*/
                        double tmp = embedded1.doubleValue(timestamp);
			if (tmp != 0)
				last_val = true;
			else
				last_val = false;
                        }

		return (last_val);
		}
        }