public static <U> ISetSequence<U> fromSetWithValues(Set<U> set, Iterable<? extends U> it) {
Set<U> tmp = set;
if (Sequence.USE_NULL_SEQUENCE) {
if (set == null && it == null) {
return NullSetSequence.instance();
} else if (set == null) {
tmp = new HashSet<U>();
} else if (it == null) {
return SetSequence.fromSet(set);
}
}
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 ISetSequence) {
return (ISetSequence<U>) tmp;
}
return new SetSequence<U>(tmp);
}
public static <U> ISetSequence<U> fromIterable(Iterable<U> it) {
if (Sequence.USE_NULL_SEQUENCE) {
if (it == null) {
return NullSetSequence.instance();
}
}
if (it instanceof ISetSequence) {
return (ISetSequence<U>) it;
}
Set<U> set = new HashSet<U>();
if (Sequence.IGNORE_NULL_VALUES) {
for (U u : it) {
if (u != null) {
set.add(u);
}
}
} else if (it instanceof Collection) {
set.addAll((Collection<? extends U>) it);
} else {
for (U u : it) {
set.add(u);
}
}
return new SetSequence<U>(set);
}
public static <U> ISetSequence<U> fromSetAndArray(Set<U> set, U... array) {
if (Sequence.NULL_ARRAY_IS_SINGLETON) {
if (array == null) {
array = (U[]) Sequence.nullSingletonArray();
}
}
if (Sequence.USE_NULL_SEQUENCE) {
if (set == null && array == null) {
return NullSetSequence.instance();
} else if (set == null) {
set = new HashSet<U>();
} else if (array == null) {
if (set instanceof ISetSequence) {
return (ISetSequence<U>) set;
}
return new SetSequence<U>(set);
}
}
List<U> input = Arrays.asList(array);
if (Sequence.IGNORE_NULL_VALUES) {
for (U u : input) {
if (u != null) {
set.add(u);
}
}
} else {
set.addAll(input);
}
if (set instanceof ISetSequence) {
return (ISetSequence<U>) set;
}
return new SetSequence<U>(set);
}
public static <U> ISetSequence<U> fromArray(U... array) {
if (Sequence.USE_NULL_SEQUENCE) {
if (array == null) {
return NullSetSequence.instance();
}
}
return SetSequence.fromSetAndArray(new HashSet<U>(), array);
}
public static <U> ISetSequence<U> fromSet(Set<U> set) {
if (Sequence.USE_NULL_SEQUENCE) {
if (set == null) {
return NullSetSequence.instance();
}
}
if (set instanceof ISetSequence) {
return (ISetSequence<U>) set;
}
return new SetSequence<U>(set);
}