diff options
Diffstat (limited to 'src/main/java/org/zwobble/mammoth/internal/util/Iterables.java')
| -rw-r--r-- | src/main/java/org/zwobble/mammoth/internal/util/Iterables.java | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/mammoth/internal/util/Iterables.java b/src/main/java/org/zwobble/mammoth/internal/util/Iterables.java index 88e906e..85fdaee 100644 --- a/src/main/java/org/zwobble/mammoth/internal/util/Iterables.java +++ b/src/main/java/org/zwobble/mammoth/internal/util/Iterables.java @@ -54,6 +54,20 @@ public class Iterables { } } + public static <T> Optional<T> tryGetLast(Iterable<? extends T> iterable) { + Iterator<? extends T> iterator = iterable.iterator(); + if (!iterator.hasNext()) { + return Optional.empty(); + } + + while (true) { + T last = iterator.next(); + if (!iterator.hasNext()) { + return Optional.of(last); + } + } + } + public static <T, R> Iterable<R> lazyFlatMap(Iterable<T> iterable, Function<T, Iterable<R>> function) { return lazyFlatten(lazyMap(iterable, function)); } |
