diff options
Diffstat (limited to 'src/main/java/org/zwobble/mammoth/util')
3 files changed, 36 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/mammoth/util/Casts.java b/src/main/java/org/zwobble/mammoth/util/Casts.java new file mode 100644 index 0000000..0925990 --- /dev/null +++ b/src/main/java/org/zwobble/mammoth/util/Casts.java @@ -0,0 +1,13 @@ +package org.zwobble.mammoth.util; + +import java.util.Optional; + +public class Casts { + public static <T> Optional<T> tryCast(Class<T> type, Object value) { + try { + return Optional.of(type.cast(value)); + } catch (ClassCastException exception) { + return Optional.empty(); + } + } +} diff --git a/src/main/java/org/zwobble/mammoth/util/MammothIterables.java b/src/main/java/org/zwobble/mammoth/util/MammothIterables.java new file mode 100644 index 0000000..89caf61 --- /dev/null +++ b/src/main/java/org/zwobble/mammoth/util/MammothIterables.java @@ -0,0 +1,11 @@ +package org.zwobble.mammoth.util; + +import com.google.common.collect.Iterables; + +import java.util.Optional; + +public class MammothIterables { + public static <T> Optional<T> tryGetLast(Iterable<T> iterable) { + return Optional.ofNullable(Iterables.getLast(iterable, null)); + } +} diff --git a/src/main/java/org/zwobble/mammoth/util/MammothOptionals.java b/src/main/java/org/zwobble/mammoth/util/MammothOptionals.java index e0e4876..6890f16 100644 --- a/src/main/java/org/zwobble/mammoth/util/MammothOptionals.java +++ b/src/main/java/org/zwobble/mammoth/util/MammothOptionals.java @@ -15,4 +15,16 @@ public class MammothOptionals { return Optional.empty(); } } + + public static <T1, T2, R> Optional<R> map( + Optional<T1> first, + Optional<T2> second, + BiFunction<T1, T2, R> function) + { + if (first.isPresent() && second.isPresent()) { + return Optional.of(function.apply(first.get(), second.get())); + } else { + return Optional.empty(); + } + } } |