graphremoveedgeevent.java

OpenJGraph是一个开源的Java库

package salvo.jesus.graph;

import java.util.*;

/**
 * This event is used to notify interested parties that an Edge object
 * is about to be removed from a Graph object.
 *
 * @author		Jesus M. Salvo Jr.
 */
public class GraphRemoveEdgeEvent extends EventObject {
  /**
    * The Edge object is about to be removed from a Graph object
    */
  private Edge	edge;

  /**
   * see getVertex()
   */
  private Vertex vertex;
    
  /**
    * Creates a GraphRemoveEdgeEvent object indicating the source of the event
    * and the Edge that is about to be removed from a Graph object
    *
    * @param	source		source of the event. This is usually the Graph object
    * where the Edge object is to be removed.
    * @param	newedge		Edge object that is about to be removed from a Graph object
    * @param	vertex		see getVertex()
    */
  public GraphRemoveEdgeEvent(
      Object source, Edge edgetoremove, Vertex vertex ) {
    super( source );
    edge = edgetoremove;
    this.vertex = vertex;
  }

  /**
    * Returns the Edge object is about to be removed from a Graph object
    *
    * @return		The Edge object to be removed
    */
  public Edge getEdge( ) {
    return this.edge;
  }

 /**
  * If this edge is being removed implicitly due to the removal of a vertex,
  * then the vertex being removed; else null.
  */
  public Vertex getVertex() 
  {
      return vertex;
  }
}