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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.
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package aima.core.environment.wumpusworld.action;
import aima.core.agent.impl.DynamicAction;
import aima.core.environment.wumpusworld.AgentPosition;
/**
* Artificial Intelligence A Modern Approach (3rd Edition): page 237.
*
* The agent can move Forward.
*
* @author Federico Baron
* @author Alessandro Daniele
* @author Ciaran O'Reilly
*/
public class Forward extends DynamicAction {
public static final String FORWARD_ACTION_NAME = "Forward";
public static final String ATTRIBUTE_TO_POSITION = "toPosition";
private AgentPosition toPosition = null;
/**
* Constructor.
*
* @param currentPosition
*
*/
public Forward(AgentPosition currentPosition) {
super(FORWARD_ACTION_NAME);
int x = currentPosition.getX();
int y = currentPosition.getY();
AgentPosition.Orientation orientation = currentPosition
.getOrientation();
switch (orientation) {
case FACING_NORTH:
toPosition = new AgentPosition(x, y + 1, orientation);
break;
case FACING_SOUTH:
toPosition = new AgentPosition(x, y - 1, orientation);
break;
case FACING_EAST:
toPosition = new AgentPosition(x + 1, y, orientation);
break;
case FACING_WEST:
toPosition = new AgentPosition(x - 1, y, orientation);
break;
}
setAttribute(ATTRIBUTE_TO_POSITION, toPosition);
}
/**
*
* @return the position after the agent move's forward. Note: this
* may not be a legal position within the environment in which the
* action was performed and this should be checked for. For example,
* if an agent tries to move forward and bumps into a wall, then the
* agent does not move.
*/
public AgentPosition getToPosition() {
return toPosition;
}
}