/*   SimpleExample/Ant.java

A very simple class, with four fields:
   ID 
   weight 
   x, y

*/

import java.util.Random; // Only the Random class

public class Ant {

	// class variables ("static")
	private static int nextID = 0;		// next ID to assign to ants
	private static Random rng;       	// pointer to rng given to us 

	// instance variables
	int		ID;                         // these have the default access
	double	weight;						//    "package private"
    int		x, y;						// see Access controls in java books


	// constructors
	Ant () {                // create with defaults provided
		ID = nextID++;
		weight = 0.0;
		x = 0;  y = 0;
	}

	Ant ( int X, int Y, double wt ) {   // constructor with parameters
		ID = nextID++;
		weight = wt;
		x = X;			// note case matters!  x != X
		y = Y;
	}


	/////////////////////////////////////////////////////////////////////////////////

	// doSomething -- silly method...
	public double doSomething ( int i ) {
		double returnValue = 0;
		double d = 20;					// i'd recommend better names than this!!
		int    j;

		// Here we send the printf message to the PrintStream object referenced by
		// the "out" field of the System class!   See System in Java API,
		// and see the printf method of the PrintStream class for details
		// on formatting the output.  (Its bascially following c printf rules.)

		System.out.printf( "Ant ID=%d (wt=%.2f) sent doSomething():\n", ID, weight );

		if ( ID % 2 == 0 && weight > 10.0 )
			returnValue = (weight + i) / d;
		else
			returnValue = getUniformRandomFractionOf( weight );

		System.out.printf( "   --> returnValue=%.3f --> ", returnValue );

		// this next is just an example of casting of data types -- see Java books
		j = (int) d;    // tell java to convert the double d into an int 

		return returnValue;
	}

	// getUniformRandomFractionOf
	// returns a random fraction of the parameter sent to in
	public double getUniformRandomFractionOf ( double d ) {
		System.out.printf( "   - Ant ID=%d sent getUniformRandomFractionOf( %.3f ):",
						   ID, d );
		double rvalue;
		double r = rng.nextDouble();
		System.out.printf( "   -> r = %.5f\n", r );
		rvalue = r * d;
		return rvalue;
	}


	public void printSelf () {
		System.out.printf( "ID = %d, x=%d, y=%d, weight = %.2f\n", 
						   ID, x, y, weight );
	}


	/////////////////////////////////////////////////////////////////////////////////
	// accessors (getters/setters)

	public static void setRng ( Random r ) { rng = r; }  // for the class variable!

	public int getID () { return ID; }  // no setter -- no others can cnage it.

	public double getWeight () { return weight; }
	public void setWeight ( double wt ) {
		weight = wt; 
	}

	// NB -- no set/get-X or -Y !!

}