From 843329de434bb334d90927c4d22345373a388530 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Tue, 2 Jul 2019 18:05:22 -0400
Subject: Rename package root

The package root is now bjc, not io.github.bculkin2442.
---
 .../java/bjc/data/internals/WrappedOption.java     | 96 ++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/main/java/bjc/data/internals/WrappedOption.java

(limited to 'src/main/java/bjc/data/internals/WrappedOption.java')

diff --git a/src/main/java/bjc/data/internals/WrappedOption.java b/src/main/java/bjc/data/internals/WrappedOption.java
new file mode 100644
index 0000000..eb4d120
--- /dev/null
+++ b/src/main/java/bjc/data/internals/WrappedOption.java
@@ -0,0 +1,96 @@
+package bjc.data.internals;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+import bjc.data.IHolder;
+import bjc.data.Option;
+
+/**
+ * A wrapped optional value.
+ *
+ * @author Ben Culkin.
+ * @param <ContainedType>
+ *        The wrapped type.
+ */
+public class WrappedOption<ContainedType> implements IHolder<ContainedType> {
+	/* The held value. */
+	private final IHolder<IHolder<ContainedType>> held;
+
+	/**
+	 * Create a new wrapped option.
+	 *
+	 * @param seedValue
+	 *        The value to wrap.
+	 */
+	public WrappedOption(final IHolder<ContainedType> seedValue) {
+		held = new Option<>(seedValue);
+	}
+
+	/*
+	 * The dummy parameter is to ensure the compiler can pick the right
+	 * method, because without this method erases to the same type as the
+	 * public one.
+	 */
+	private WrappedOption(final IHolder<IHolder<ContainedType>> toHold,
+			@SuppressWarnings("unused") 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);
+			});
+		});
+	}
+}
-- 
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