// Copyright (c) 1995, 1996 Regents of the University of California.
// All rights reserved.
//
// This software was developed by the Arcadia project
// at the University of California, Irvine.
//
// Redistribution and use in source and binary forms are permitted
// provided that the above copyright notice and this paragraph are
// duplicated in all such forms and that any documentation,
// advertising materials, and other materials related to such
// distribution and use acknowledge that the software was developed
// by the University of California, Irvine.  The name of the
// University may not be used to endorse or promote products derived
// from this software without specific prior written permission.
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
// WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

// File: NetArc.java
// Classes: NetArc
// Original Author: ics125b spring 1996
// Modifications : Kedar Patankar
// $Id: NetArc.java,v 1.1.1.1 1997/02/27 20:52:43 chandra Exp $

package uci.graphedit;

/** This class models an arc in our underlying connected graph model */

public  class NetArc extends NetPrimitive 
{

  /** The start and end nodes of this arc. */
  private NetNode _sourceNode;
  private NetNode _destNode;
  protected ArcPerspective arcPerspective;
  private int id;
  public void setId(int i){id=i;}
  public int getId(){return id;}

  public void set_perspective(ArcPerspective a){	arcPerspective=a;}
  public ArcPerspective get_perspective(){return arcPerspective;}

  /** Construct a new NetArc */
  public NetArc() { }

  /** Get and set methods */
  public void sourceNode(NetNode s) { _sourceNode = s; }
  public NetNode sourceNode() { return _sourceNode; }
  public void destNode(NetNode d) { _destNode = d; }
  public NetNode destNode() { return _destNode; }
  
  /** Connect the source and destination ports, iff they agree to
   * being connected (i.e., canConnectTo() returns true). Reply true
   * on success. This method is noramlly called after a new arc
   * instance is made. Maybe this behavior should be in a constructor,
   * but I want to use Class#newInstancel so constructors do not get
   * any arguments. */
  public void connect(NetNode s, NetNode d) 
  {
	  sourceNode(s);
	  destNode(d);
	  s.addOutArc(this);
	  d.addInArc(this);
	  postConnect(s,d);
  }
  
  /** Do some application specific action just after this node is
   * connected to another node. the arguments contain some info about
   * what ports were connected. */
  public void postConnect(NetNode sourceNode,NetNode destNode) { }
  
  
  /** Remove this NetArc from the underlying connected graph model. */
  public void dispose() 
  {
    System.out.println("disposing: " + toString());
    if (sourceNode() != null && destNode() != null) 
	{
      _sourceNode.removeArc(this);
      _destNode.removeArc(this);
      // needs-more-work: assumes no parallel arcs!
//      _sourceNode.postDisconnect(destNode());
//      _destNode.postDisconnect(sourceNode());
    }
  }
  
} /* end class NetArc */