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The OpenTripPlanner multimodal journey planning system

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package org.opentripplanner.astar.spi;

public interface TraverseVisitor<
  State extends AStarState, Edge extends AStarEdge
> {
  /** Called when A* explores an edge */
  void visitEdge(Edge edge);

  /** Called when A* dequeues a vertex */
  void visitVertex(State state);

  /** Called when A* enqueues a vertex */
  void visitEnqueue();
}