public static <U> IDequeSequence<U> fromDequeAndArray(Deque<U> deque, U... array) {
if (Sequence.NULL_ARRAY_IS_SINGLETON) {
if (array == null) {
array = (U[]) Sequence.nullSingletonArray();
}
}
if (Sequence.USE_NULL_SEQUENCE) {
if (deque == null && array == null) {
return NullDequeSequence.instance();
} else if (deque == null) {
deque = new LinkedList<U>();
} else if (array == null) {
if (deque instanceof IDequeSequence) {
return (IDequeSequence<U>) deque;
}
return new DequeSequence<U>(deque);
}
}
List<U> input = Arrays.asList(array);
if (Sequence.IGNORE_NULL_VALUES) {
for (U u : input) {
if (u != null) {
deque.add(u);
}
}
} else {
deque.addAll(input);
}
if (deque instanceof IDequeSequence) {
return (IDequeSequence<U>) deque;
}
return new DequeSequence<U>(deque);
}
public static <U> IDequeSequence<U> fromDequeWithValues(
Deque<U> deque, Iterable<? extends U> it) {
Deque<U> tmp = deque;
if (Sequence.USE_NULL_SEQUENCE) {
if (deque == null && it == null) {
return NullDequeSequence.instance();
} else if (deque == null) {
tmp = new LinkedList<U>();
} else if (it == null) {
return DequeSequence.fromDeque(deque);
}
}
if (Sequence.IGNORE_NULL_VALUES) {
for (U u : it) {
if (u != null) {
tmp.add(u);
}
}
} else if (it instanceof Collection) {
tmp.addAll((Collection<? extends U>) it);
} else {
for (U u : it) {
tmp.add(u);
}
}
if (tmp instanceof IDequeSequence) {
return (IDequeSequence<U>) tmp;
}
return new DequeSequence<U>(tmp);
}
public static <U> IDequeSequence<U> fromIterable(Iterable<U> it) {
if (Sequence.USE_NULL_SEQUENCE) {
if (it == null) {
return NullDequeSequence.instance();
}
}
if (it instanceof IDequeSequence) {
return (IDequeSequence<U>) it;
}
Deque<U> deque = new LinkedList<U>();
if (Sequence.IGNORE_NULL_VALUES) {
for (U u : it) {
if (u != null) {
deque.add(u);
}
}
} else if (it instanceof Collection) {
deque.addAll((Collection<? extends U>) it);
} else {
for (U u : it) {
deque.add(u);
}
}
return new DequeSequence<U>(deque);
}