General changes

1 files changed, 74 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/Option.java b/BJC-Utils2/src/main/java/bjc/utils/data/Option.java
new file mode 100644
index 0000000..9f6d448
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/Option.java
@@ -0,0 +1,74 @@
+package bjc.utils.data;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+/**
+ * A holder that may or may not contain a value
+ * 
+ * @author ben
+ *
+ * @param <ContainedType>
+ *            The type of the value that may or may not be held
+ */
+public class Option<ContainedType> implements IHolder<ContainedType> {
+	private ContainedType held;
+
+	/**
+	 * Create a new optional, using the given initial value
+	 * 
+	 * @param seedValue
+	 *            The initial value for the optional
+	 */
+	public Option(ContainedType seedValue) {
+		held = seedValue;
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(
+			Function<ContainedType, IHolder<BoundType>> binder) {
+		if (held == null) {
+			return new Option<>(null);
+		}
+
+		return binder.apply(held);
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(
+			Function<ContainedType, MappedType> mapper) {
+		if (held == null) {
+			return new Option<>(null);
+		}
+
+		return new Option<>(mapper.apply(held));
+	}
+
+	@Override
+	public IHolder<ContainedType> transform(
+			UnaryOperator<ContainedType> transformer) {
+		if (held != null) {
+			held = transformer.apply(held);
+		}
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(
+			Function<ContainedType, UnwrappedType> unwrapper) {
+		if (held == null) {
+			return null;
+		}
+
+		return unwrapper.apply(held);
+	}
+
+	@Override
+	public <NewType> Function<ContainedType, IHolder<NewType>> lift(
+			Function<ContainedType, NewType> func) {
+		return (val) -> {
+			return new Option<>(func.apply(val));
+		};
+	}
+}