1 files changed, 76 insertions, 0 deletions
diff --git a/base/src/main/java/bjc/utils/data/internals/WrappedOption.java b/base/src/main/java/bjc/utils/data/internals/WrappedOption.java
new file mode 100644
index 0000000..512c699
--- /dev/null
+++ b/base/src/main/java/bjc/utils/data/internals/WrappedOption.java
@@ -0,0 +1,76 @@
+package bjc.utils.data.internals;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+import bjc.utils.data.IHolder;
+import bjc.utils.data.Option;
+
+public class WrappedOption<ContainedType> implements IHolder<ContainedType> {
+	private final IHolder<IHolder<ContainedType>> held;
+
+	public WrappedOption(final IHolder<ContainedType> seedValue) {
+		held = new Option<>(seedValue);
+	}
+
+	private WrappedOption(final IHolder<IHolder<ContainedType>> toHold, final boolean dummy) {
+		held = toHold;
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(final Function<ContainedType, IHolder<BoundType>> binder) {
+		final IHolder<IHolder<BoundType>> newHolder = held.map((containedHolder) -> {
+			return containedHolder.bind((containedValue) -> {
+				if (containedValue == null) return new Option<>(null);
+
+				return binder.apply(containedValue);
+			});
+		});
+
+		return new WrappedOption<>(newHolder, false);
+	}
+
+	@Override
+	public <NewType> Function<ContainedType, IHolder<NewType>> lift(final Function<ContainedType, NewType> func) {
+		return (val) -> {
+			return new Option<>(func.apply(val));
+		};
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(final Function<ContainedType, MappedType> mapper) {
+		final IHolder<IHolder<MappedType>> newHolder = held.map((containedHolder) -> {
+			return containedHolder.map((containedValue) -> {
+				if (containedValue == null) return null;
+
+				return mapper.apply(containedValue);
+			});
+		});
+
+		return new WrappedOption<>(newHolder, false);
+	}
+
+	@Override
+	public IHolder<ContainedType> transform(final UnaryOperator<ContainedType> transformer) {
+		held.transform((containedHolder) -> {
+			return containedHolder.transform((containedValue) -> {
+				if (containedValue == null) return null;
+
+				return transformer.apply(containedValue);
+			});
+		});
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(final Function<ContainedType, UnwrappedType> unwrapper) {
+		return held.unwrap((containedHolder) -> {
+			return containedHolder.unwrap((containedValue) -> {
+				if (containedValue == null) return null;
+
+				return unwrapper.apply(containedValue);
+			});
+		});
+	}
+}