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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.map;

import java.util.HashMap;

import aima.core.agent.Agent;
import aima.core.agent.EnvironmentState;
import aima.core.util.datastructure.Pair;

/**
 * @author Ciaran O'Reilly
 * 
 */
public class MapEnvironmentState implements EnvironmentState {
	private java.util.Map> agentLocationAndTravelDistance = new HashMap>();

	public MapEnvironmentState() {

	}

	public String getAgentLocation(Agent a) {
		Pair locAndTDistance = agentLocationAndTravelDistance
				.get(a);
		if (null == locAndTDistance) {
			return null;
		}
		return locAndTDistance.getFirst();
	}

	public Double getAgentTravelDistance(Agent a) {
		Pair locAndTDistance = agentLocationAndTravelDistance
				.get(a);
		if (null == locAndTDistance) {
			return null;
		}
		return locAndTDistance.getSecond();
	}

	public void setAgentLocationAndTravelDistance(Agent a, String location,
			Double travelDistance) {
		agentLocationAndTravelDistance.put(a, new Pair(
				location, travelDistance));
	}
}