Building Efficient Navigation with Java Autopilot
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The Autopilot Class
The `Autopilot` class is a fundamental part of the autopilot system. Let's break down its key components:
```java
package autopilotModule;
import controlSurfacesModule.GPSDataSubject;
import navigationModule.NavProxy;
public class Autopilot {
private NavProxy proxy;
private int nextWaypointLatitude;
private int nextWaypointLongitude;
private Coordinates resultingCoordinates;
private GPSDataSubject gpsDataSubject;
public Autopilot(NavProxy proxy, int nextWaypointLatitude, int nextWaypointLongitude) {
this.proxy = proxy;
this.nextWaypointLatitude = nextWaypointLatitude;
this.nextWaypointLongitude = nextWaypointLongitude;
this.gpsDataSubject = new GPSDataSubject(this);
}
```
Autopilot Initialization
The `Autopilot` class initializes with a `NavProxy` object, representing a navigation proxy, and the latitude and longitude coordinates of the next waypoint. Additionally, it creates a `GPSDataSubject` object, allowing communication with other parts of the navigation system.
The `navigate` Method
```java
/**
* The point of this method is to send a message to the proxy.
* @return the same coordinates that the facade is returning to the autopilot (via the proxy)
*/
public Coordinates navigate() {
resultingCoordinates = this.proxy.getLocation();
gpsDataSubject.update(resultingCoordinates);
return resultingCoordinates; // change this, as it should return the coordinates that the facade gave to the autopilot.
}
```
The `navigate` method is responsible for communicating with the proxy to obtain location data. It retrieves coordinates from the proxy and updates the `GPSDataSubject` with this information. However, please note that there is a comment suggesting that the return statement may need modification.
Accessor Methods
```java
public Coordinates getResultingCoordinates() {
return resultingCoordinates;
}
public int getNextWaypointLatitude() {
return nextWaypointLatitude;
}
public int getNextWaypointLongitude() {
return nextWaypointLongitude;
}
```
These are accessor methods to retrieve the resulting coordinates, next waypoint latitude, and next waypoint longitude.
The Coordinates Class
The `Coordinates` class represents geographical coordinates and implements the Observer pattern. Here's what it includes:
```java
package autopilotModule;
import controlSurfacesModule.Observable;
import controlSurfacesModule.Observer;
import java.util.ArrayList;
import java.util.List;
public class Coordinates implements Observable {
private int latitude;
private int longitude;
private List observers = new ArrayList<>();
public Coordinates(int latitude, int longitude) {
this.latitude = latitude;
this.longitude = longitude;
}
```
Coordinates Initialization
The `Coordinates` class is initialized with latitude and longitude values. It also maintains a list of observers for notifying interested parties of any changes to the coordinates.
Getter and Setter Methods
```java
// Getter and setter methods for latitude and longitude
public boolean equals(Coordinates c){
return this.latitude == c.latitude && this.longitude == c.longitude;
}
```
The class provides getter and setter methods for latitude and longitude. Additionally, it includes an `equals` method to compare coordinates.
Observer Design Pattern
```java
@Override
public void addObserver(Observer observer) {
observers add(observer);
}
@Override
public void removeObserver(Observer observer) {
observers.remove(observer);
}
@Override
public void notifyObservers() {
for (Observer observer : observers) {
observer.update(this);
}
}
```
The `Coordinates` class implements the Observer pattern. It allows observers to be added or removed and notifies them of any changes to the coordinates.
Conclusion
In this guide, we've delved into the Java classes Autopilot and Coordinates, which play pivotal roles in aviation and navigation systems. Understanding how these classes work is essential for building robust and reliable navigation software. The Autopilot class manages communication with a navigation proxy, while the Coordinates class handles the storage and observation of geographical coordinates. These classes provide the foundation for creating an effective autopilot system in Java. By grasping their functionality, developers are well-equipped to navigate the complex world of aerospace technology and contribute to safer and more efficient air travel.