From 87ae1dfc8d8cb7b51d7bda4750ce841bbe691cfc Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Sat, 7 May 2016 12:51:23 -0400
Subject: General changes

---
 .../src/main/java/bjc/utils/data/WrappedLazy.java  | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/data/WrappedLazy.java

(limited to 'BJC-Utils2/src/main/java/bjc/utils/data/WrappedLazy.java')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/WrappedLazy.java b/BJC-Utils2/src/main/java/bjc/utils/data/WrappedLazy.java
new file mode 100644
index 0000000..737482c
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/WrappedLazy.java
@@ -0,0 +1,69 @@
+package bjc.utils.data;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+class WrappedLazy<ContainedType> implements IHolder<ContainedType> {
+	private IHolder<IHolder<ContainedType>> held;
+
+	// This has an extra parameter, because otherwise it erases to the same
+	// as the public one
+	private WrappedLazy(IHolder<IHolder<ContainedType>> wrappedHolder,
+			@SuppressWarnings("unused") boolean dummy) {
+		held = wrappedHolder;
+	}
+
+	public WrappedLazy(IHolder<ContainedType> wrappedHolder) {
+		held = new Lazy<>(wrappedHolder);
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(
+			Function<ContainedType, IHolder<BoundType>> binder) {
+		IHolder<IHolder<BoundType>> newHolder = held
+				.map((containedHolder) -> {
+					return containedHolder.bind(binder);
+				});
+
+		return new WrappedLazy<>(newHolder, false);
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(
+			Function<ContainedType, MappedType> mapper) {
+		IHolder<IHolder<MappedType>> newHolder = held
+				.map((containedHolder) -> {
+					return containedHolder.map(mapper);
+				});
+
+		return new WrappedLazy<>(newHolder, false);
+	}
+
+	@Override
+	public IHolder<ContainedType> transform(
+			UnaryOperator<ContainedType> transformer) {
+		// FIXME this smells bad to me, but I can't figure out how else to
+		// do it
+		held.transform((containedHolder) -> {
+			return containedHolder.transform(transformer);
+		});
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(
+			Function<ContainedType, UnwrappedType> unwrapper) {
+		return held.unwrap((containedHolder) -> {
+			return containedHolder.unwrap(unwrapper);
+		});
+	}
+
+	@Override
+	public <NewType> Function<ContainedType, IHolder<NewType>> lift(
+			Function<ContainedType, NewType> func) {
+		return (val) -> {
+			return new Lazy<>(func.apply(val));
+		};
+	}
+}
-- 
cgit v1.2.3