public final class IterableUtil extends Object
Modifier and Type | Method and Description |
---|---|
static boolean |
isNullOrEmpty(Iterable<?> iterable)
Indicates whether the given
Iterable is null or empty. |
static <T> Iterable<T> |
iterable(T... elements) |
static <T> Iterator<T> |
iterator(T... elements) |
static <T> List<T> |
nonNullElementsIn(Iterable<? extends T> i)
Returns all the non-
null elements in the given Iterable . |
static int |
sizeOf(Iterable<?> iterable)
Returns the size of the given
Iterable . |
static <T> T[] |
toArray(Iterable<? extends T> iterable)
Create an array from an
Iterable . |
static <T> T[] |
toArray(Iterable<? extends T> iterable,
Class<T> type)
Create an typed array from an
Iterable . |
static <T> Collection<T> |
toCollection(Iterable<T> iterable) |
public static boolean isNullOrEmpty(Iterable<?> iterable)
Iterable
is null
or empty.iterable
- the given Iterable
to check.true
if the given Iterable
is null
or empty, otherwise false
.public static int sizeOf(Iterable<?> iterable)
Iterable
.iterable
- the Iterable
to get size.Iterable
.NullPointerException
- if given Iterable
is null.public static <T> List<T> nonNullElementsIn(Iterable<? extends T> i)
null
elements in the given Iterable
.T
- the type of elements of the Iterable
.i
- the given Iterable
.null
elements in the given Iterable
. An empty list is returned if the given
Iterable
is null
.public static <T> T[] toArray(Iterable<? extends T> iterable)
Iterable
.
Note: this method will return Object[]. If you require a typed array please use toArray(Iterable, Class)
.
It's main usage is to keep the generic type for chaining call like in:
public S containsOnlyElementsOf(Iterable<? extends T> iterable) {
return containsOnly(toArray(iterable));
}
public static <T> T[] toArray(Iterable<? extends T> iterable, Class<T> type)
Iterable
.public static <T> Collection<T> toCollection(Iterable<T> iterable)
@SafeVarargs public static <T> Iterable<T> iterable(T... elements)
@SafeVarargs public static <T> Iterator<T> iterator(T... elements)
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