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package io.dico.dicore.event;
@SuppressWarnings("unchecked")
public class ChainedListeners {
private static final ChainedListener<?> empty = new ChainedListener<Object>() {
@Override
public void accept(Object event) {
}
@Override
public ChainedListener<Object> withElement(SimpleListener other) {
return ChainedListeners.singleton(other);
}
@Override
public int getElementCount() {
return 0;
}
@Override
public SimpleListener<Object> getDelegateOfLastNode() {
return null;
}
};
private ChainedListeners() {
}
public static <T> ChainedListener<T> empty() {
return (ChainedListener<T>) empty;
}
public static <T> ChainedListener<T> singleton(SimpleListener<T> element) {
if (element instanceof ChainedListener) {
return (ChainedListener<T>) element;
}
if (element == null) {
return empty();
}
return new ChainedListener<T>() {
@Override
public void accept(T event) {
element.accept(event);
}
@Override
public SimpleListener getDelegateOfLastNode() {
return element;
}
};
}
}
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