@Override
public T selectAny() {
Iterator<T> it = backend.iterator();
if (it.hasNext()) {
return it.next();
} else {
return null;
}
}
@Override
public Collection<T> remove(Object element) {
if (element == null) {
return this;
}
Builder<T, ? extends Collection<T>> builder = createBuilder();
Iterator<T> it = backend.iterator();
while (it.hasNext()) {
T e = it.next();
if (element.equals(e)) {
return builder.addAll(it).build();
} else {
builder.add(e);
}
}
return this;
}
@Override
public Iterator<T> iterator() {
Iterator<T> it = backend.iterator();
return new Iterator<T>() {
// Note: this implementation does not override (willingly) the
// 'remove' method which (by default) throws an
// UnsupportedOperationException.
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public T next() {
return it.next();
}
};
}