import java.awt.Color;
import java.util.Enumeration;

/*
 * Created on Aug 25, 2003
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
/**
 * @author mike
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class Cell extends SimObject {

	/*@non_null@*/ private CellState state;
	
	public Cell()
	// EFFECTS: Initializes this to a dead cell.
	{
		super();
		state = CellState.createDead();
	}
	
	public /*@non_null@*/ Color getColor () 
	   // EFFECTS: Returns green if the cell is alive, otherwise returns white.
	{
		if(isAlive())
		{
			return Color.green;
		}
		else
		{
			return Color.white;
		}
		 
	} //@nowarn NonNullResult
	
	public boolean setState (/*@non_null@*/ CellState s)
	   // MODIFIES: this
	   // EFFECTS: Sets the cell's current state to s.  Returns true iff the new state is different from the current state.
	{
		if (state.equals (s)) {
			return false;
		} else {
			state = s;
			return true;
		}
	}
    
	public /*@non_null@*/ CellState getState ()
	   // EFFECTS: Returns the cell's current state.
	{
		return state;
	}
    
	boolean isAlive()
	   // EFFECTS: Returns true if the cell is alive, false otherwise.
	{
		return state.isAlive();
	}	
	
	public int countAliveNeighbors()
	// REQUIRES: All neighbors are of type Cell.
	// EFFECTS: Returns the number of neighbors.
	{
		int count = 0;
		
		Enumeration neighbors = getNeighbors();
		while(neighbors.hasMoreElements())
		{
			Cell cell = (Cell) neighbors.nextElement();
			if(cell.isAlive())
			{
				count++;
			}
		}
		
		return count;
	}
	
	public /*@non_null@*/ CellState getNextState()
	// REQUIRES: init has previously been called for this.
	// EFFECTS: Returns next state value for this.
	//    For the underlying Cell class, the next state is always the
	//    current state.
	// This method will be overloaded by cell implementations
	// for various cell automata rules.	 
	{
	 return state;
    }
}