edge

package hw4;

import java.util.Objects;

public class Edge {
  private Node startPoint;
  private Node endPoint;
  private String label;


  public Edge(Node start, Node end, String label) {
    this.startPoint = start;
    this.endPoint = new Node(end.getName(),label);
    this.label = label;
    //checkRep();
  }

  public Node getStartPoint(){
    return new Node(startPoint);
  }

  public Node getEndPoint() {
    return new Node(endPoint);
  }

  public String getLabel() {
    return label;
  }

  public Edge getEdge() {
    Node tempStart = new Node(this.startPoint.getName());
    Node tempEnd = new Node(this.endPoint.getName());
    String tempLabel = this.label;

    return new Edge(tempStart,tempEnd,tempLabel);
  }

  @Override
  public int hashCode() {
    return Objects.hash(startPoint,endPoint,label);
  }

  @Override
    public boolean equals(Object obj) {
        if((obj == null) || (getClass() != obj.getClass())){
            return false;
        }
        Edge tempEdge = (Edge) obj;
        return this.startPoint.equals(tempEdge.startPoint)
            && this.endPoint.equals(tempEdge.endPoint)
            && this.label.equals(tempEdge.label);
    }

    public void checkRep() {
       if(startPoint == null) throw new RuntimeException("Error: Start point of edge is null");
         if(endPoint == null) throw new RuntimeException("Error: End point of edge is null");
         if(label == null) throw new RuntimeException("Error: Labelof edge is null");
    }

}