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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.camilstaps.route66;
import OO14route66.Car;
import OO14route66.Model;
/**
* The Overviewer (always only one instance) tells Drivers when they can drive
*
* @author Camil Staps
*/
public class Overviewer {
/**
* This is a singleton
*/
private static Overviewer instance;
Car[] cars = new Car[Model.NUMBEROFCARS];
/**
* This is a singleton
* @return the instance
*/
public static Overviewer getInstance() {
if (instance == null) {
instance = new Overviewer();
}
return instance;
}
/**
* Add a car to the list of cars
* @param car
*/
public synchronized void hello(Car car) {
cars[car.getNumber()] = car;
}
/**
* Check if a location is safe for a car to go to. This should always be
* checked by a driver before actually driving.
* @param car
* @param requested_location
* @return
*/
public synchronized boolean isSafeLocation(Car car, int requested_location) {
for (Car that_car : cars) {
if (that_car != null && that_car != car &&
that_car.getDirection() == car.getDirection() &&
that_car.getLocation() > requested_location &&
that_car.getLocation() < requested_location + Car.CARLENGTH + Car.MINCARSPACE) {
return false;
}
}
return true;
}
}
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