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package xlogo.interfaces;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class PropertyChangePublisher<E extends Enum<E>> implements Observable<E>, Serializable {
private static final long serialVersionUID = -1042512850782413412L;
private boolean enableEvents = true;
private final HashMap<E, List<PropertyChangeListener>> listeners = new HashMap<>();
private final List<PropertyChangeListener> allPropertiesListeners = new ArrayList<>();
@Override
public void addPropertyChangeListener(E property, PropertyChangeListener listener) {
if (listener == null){
throw new IllegalArgumentException("Cannot add an event listeners that is null.");
}
if (property == null){
allPropertiesListeners.add(listener);
return;
}
List<PropertyChangeListener> list = listeners.get(property);
if (list == null) {
list = new ArrayList<>();
listeners.put(property, list);
}
list.add(listener);
}
@Override
public void removePropertyChangeListener(E property, PropertyChangeListener listener) {
if (listener == null){
throw new IllegalArgumentException("Cannot remove an event listeners that is null.");
}
if (property == null){
allPropertiesListeners.remove(listener);
return;
}
List<PropertyChangeListener> list = listeners.get(property);
if(list != null){
list.remove(listener);
}
}
public void publishEvent(E property){
if (!enableEvents){
return;
}
setEnableEvents(false);
if (listeners.containsKey(property))
listeners.get(property).forEach((listener) -> listener.propertyChanged());
allPropertiesListeners.forEach((listener) -> listener.propertyChanged());
setEnableEvents(true);
}
public void setEnableEvents(boolean enableEvents) {
this.enableEvents = enableEvents;
}
}
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