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package ch.epfl.maze.util;
import java.util.HashMap;
import java.util.Map;
/**
* A trail keeping track on positional markings.
*
* @author Pacien TRAN-GIRARD
*/
public class Trail {
public enum Marking {
NO_MARKING,
AVOID_MARKING,
NO_GO_MARKING;
public static final Marking DEFAULT = NO_MARKING;
public static final Marking[] ALL = new Marking[]{NO_MARKING, AVOID_MARKING, NO_GO_MARKING};
/**
* Returns the next Marking.
*
* @return The next Marking
*/
public Marking getNext() {
switch (this) {
case NO_MARKING:
return AVOID_MARKING;
case AVOID_MARKING:
return NO_GO_MARKING;
case NO_GO_MARKING:
return NO_GO_MARKING;
default:
return AVOID_MARKING;
}
}
}
private final Map<Vector2D, Marking> trail;
/**
* Constructs a new blank Trail.
*/
public Trail() {
this.trail = new HashMap<>();
}
/**
* Get the marking at the given position.
*
* @param position The positional Vector
* @return The Marking
*/
public Marking getMarking(Vector2D position) {
Marking marking = this.trail.get(position);
return marking != null ? marking : Marking.NO_MARKING;
}
/**
* Marks the given position with the given Marking.
*
* @param position The positional vector
* @param marking The Marking
*/
public void markPosition(Vector2D position, Marking marking) {
this.trail.put(position, marking);
}
/**
* Marks the given position with the following Marking.
*
* @param position The positional vector
*/
public void markPosition(Vector2D position) {
this.markPosition(position, this.getMarking(position).getNext());
}
}
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