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package io.dico.dicore.event;
public class ChainedListenerHandles {
private ChainedListenerHandles() {
}
private static final ChainedListenerHandle empty = new ChainedListenerHandle() {
@Override
public void register() {
}
public void unregister() {
}
@Override
public ChainedListenerHandle withElement(ListenerHandle other) {
return ChainedListenerHandles.singleton(other);
}
@Override
public int getElementCount() {
return 0;
}
@Override
public ListenerHandle getDelegateOfLastNode() {
return null;
}
};
public static ChainedListenerHandle empty() {
return empty;
}
public static ChainedListenerHandle singleton(ListenerHandle element) {
if (element instanceof ChainedListenerHandle) {
return (ChainedListenerHandle) element;
}
if (element == null) {
return empty();
}
return new ChainedListenerHandle() {
@Override
public void register() {
element.register();
}
public void unregister() {
element.unregister();
}
@Override
public ListenerHandle getDelegateOfLastNode() {
return element;
}
};
}
}
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