/** GPTerminalNode.java
  * J Scott Cameron
  * GPNode that holds a constant  
  */
import GPNode.*;
import java.util.*;

public class GPTerminalNode implements GPNode {
    
    private double value;/* constant value */
    private Random random;
    
    /* default constructor */
    public GPTerminalNode()
    { 
        random = new Random();
        value = (double)Math.abs(random.nextInt())%10;
    }
    
    /* passing in a Random ensures a unique value */
    public GPTerminalNode(Random r)
    { 
        
       value = (double)Math.abs(r.nextInt())%10;
    }
    
    /* parameterized constructor */
    public GPTerminalNode(double d)
    { 
        
        value = d;
    }
    
    /* copy constructor */
    public GPTerminalNode(GPTerminalNode gpt)
    {
        value = gpt.value;
    }
    
    /* returns a new copy of the Node */
    public GPNode copy()
    {
        GPTerminalNode gpt=  new GPTerminalNode();
        gpt.value = value;
        return gpt;
    }
    
    /* returns value as a Double */
    public Double value()
    throws NoSuchMethodException
    {
        return new Double(value);
    }
    
    /* returns 0, since this is always a leaf*/
    public int childCount()
    {
        return 0;
    }
    
    /* has no children, this should never get called*/
    public GPNode getChild(int i)
    {
        return null;
    }
    
    /*has no children, should never get called */
    public void setChild(int i,GPNode gpn)
    {        
    }
    
    /* this is the only Node in the tree
     * so return this */
    public GPNode find(int i)
    {
        return this;
    }
    
    /* return 1, this is a leaf*/
    public int count()
    {
        return 1;
    }
    
    /* only node, return 1 */
    public int nodeNumber()
    {
        return 1;
    }
    
    /* no children, this should never get called */
    public void setDescendant(int number, GPNode gpn)
    {}
    
    /* returns TERMINAL */
    public int getType()
    {
        return TERMINAL;
    }
    
    /* no function associated with a constant,
     * does nothing, this should never be called */
    public void setFunction(GPPair gpp)
    {;}
    
    /* returns a String of the double */
    public String toString()
    {
        return (new Double(value)).toString();
    }
}