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package model;
/**
* A single observed data that notifies the observer once changed.
*/
public class ObservedData<T> {
/**
* The data.
*/
private T data;
/**
* The observer.
*/
private Observer<T> acceptor;
/**
* EFFECTS: Init with the given initial value and observer.
* REQUIRES: acceptor != null
*/
public ObservedData(T initialValue, Observer<T> acceptor) {
this.data = initialValue;
this.acceptor = acceptor;
}
/**
* EFFECTS: Set the data and notify the observer with the new data and DIRECTION_CHANGE + INDEX_NOT_IN_LIST.
*/
public void set(T data) {
this.data = data;
acceptor.accept(data, Observer.DIRECTION_CHANGE, Observer.INDEX_NOT_IN_LIST);
}
/**
* EFFECTS: Get the data.
*/
public T get() {
return data;
}
/**
* EFFECTS: Get the observer.
*/
public Observer<T> getAcceptor() {
return acceptor;
}
}
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