/*
public class EdgeSet API:
constructor:
  public EdgeSet()

accessor:
  public Edge getEdge(int index)

mutator:
  public void addEdge(Edge edge)

misc:
  public String toString()
  public int length()

*/
public class EdgeSet {
    private Edge [] edges;
    private int edgeCount;
    private static final int MAX_EDGES = 40;

    public EdgeSet(){
		edges = new Edge [MAX_EDGES];
		edgeCount = 0;
    }

    public String toString() {
		String string = "";
		for (int i = 0; i < edgeCount; i++) {
			string += edges[i].toString() + "; "+ '\n';
		}
		return string;
    }

    public void addEdge(Edge edge)     {
		if (alreadyPresent(edge)) {
			return;
		}

		if (edgeCount < MAX_EDGES) {
			edges[edgeCount] = edge;
			edgeCount++;
			return;
		}

		System.out.println("Error: EdgeSet capacity "
				   + MAX_EDGES + ") exceeded");
		System.out.println("Error: cannot add edge ("
				   + edge.toString()
				   + ")");
    }


    private boolean alreadyPresent(Edge edge)     {
		for(int i = 0; i < edgeCount; i++) {
			if (edge.equals(edges[i])) {
				return true;
			}
		}
		return false;
    }

    public int length() {
		return edgeCount;
    }

    public Edge getEdge(int index) {
		if (index < edgeCount) {
			return edges[index];
		}
		System.out.println("Error: EdgeSet:getEdge index => edgeCount");
		System.out.println("Error: index = " + index
				   + " edgeCount = " + edgeCount);
		return null;
    }

}