import java.awt.*;
import java.awt.geom.*;

/**
 * The super class of all network nodes.
 * 
 * @author Eric Lemar
 */
public abstract class NetworkNode implements Node
{
   /** The upper left hand corner */
   protected double x;
   /** The upper left hand corner */
   protected double y; 

   public NetworkNode()
   {
      x = 0;
      y = 0;
   }

   /**
    * Tell this node that it is being removed.
    *
    * The provided implementaion is a no-op.
    *
    * @param e The edge that is being removed.
    */
   public void signalRemove(NetworkEdge e) {
      return;        
   }

   public Object clone()
   {
      try {
         return super.clone();
      } catch (CloneNotSupportedException cne) {
         return null;
      }
   } 

   public void translate(double dx, double dy) {
      x += dx;
      y += dy;
   }

   /**
    * Ask whether it's ok to add an edge to another node.
    *
    * The provided implementation always returns <code>true</code>.
    *
    * @param e The edge being added
    * @param otherNode the node on the other side of the edge
    * @return <code>true</code> if ok, <code>false</code> otherwise.
    */
   public boolean isOkConnect(NetworkEdge e,NetworkNode otherNode) {
      return true;
   }

   /**
    * Tell this node that an edge was added.
    *
    * The provided implementation is a noop. 
    *
    * @param e The edge added.
    * @param otherNode The node on the other end.
    */
   public void addedEdge(NetworkEdge e,NetworkNode otherNode) {
      return;
   }
}