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Subject.java
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Subject.java
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import java.util.ArrayList;
/** Subject which receives input from GUI and sends processed data to Observers */
public class Subject implements SubjectInterface {
/** Observers to notify when data changes */
private final ArrayList<ObserverInterface> observers;
/** ArtSupply data to be sent to Observers */
private ArtSupply data;
/** Basic constructor */
public Subject() {
this.observers = new ArrayList<>();
}
/**
* Retrieves a list of ArtSupply data to send to Observers
* @return list of ArtSupplies to be used by Observers
*/
public ArrayList<ArtSupply> getData() {
ArrayList<ArtSupply> data = new ArrayList<>();
data.add(this.data);
return data;
}
/** Receives new GUI input and sets new data, notifying Observers data has changed */
public void setData() {
this.data = new ArtSupply("communication test");
notifyObservers();
}
/**
* Adds a new Observer to the list
* @param observer the Observer to be added (notified on change)
*/
public void register(ObserverInterface observer) {
if (observer != null && !observers.contains(observer)) observers.add(observer);
}
/**
* Removes an Observer from the list
* @param observer the Observer to be removed (no longer notified)
*/
public void unregister(ObserverInterface observer) {
observers.remove(observer);
}
/** Notifies all registered Observers that data has changed */
public void notifyObservers() {
for (ObserverInterface observer : observers) observer.update();
}
}