/*
public class Edge API:
constructor:
  public Edge(Node fromNode, Node toNode)

accessors:
  public Node getSourceNode()
  public Node getTargetNode()

mutators:

misc:
  public String toString()
  public boolean equals(Edge other)

*/



public class Edge {
    private Node sourceNode, targetNode;

    public Edge(Node fromNode, Node toNode) {
		sourceNode = fromNode;
		targetNode = toNode;
    }

    public Node getSourceNode() {
		return sourceNode;
	}

    public Node getTargetNode() {
		return targetNode;
	}

    public String toString() {
		return sourceNode.toString() + " -> " + targetNode.toString();
    }

    public boolean equals(Edge other) {
		return(sourceNode.equals(other.sourceNode) &&
	       targetNode.equals(other.targetNode));
    }
}