Collapse nodes where appropriate

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();
+        }
+    }
 }