Package reorganization

6 files changed, 799 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundLazy.java b/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundLazy.java
new file mode 100644
index 0000000..beb2465
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundLazy.java
@@ -0,0 +1,164 @@
+package bjc.utils.data.internals;
+
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.function.UnaryOperator;
+
+import bjc.utils.data.IHolder;
+import bjc.utils.data.Lazy;
+import bjc.utils.funcdata.FunctionalList;
+import bjc.utils.funcdata.IList;
+
+/**
+ * Implements a lazy holder that has been bound
+ */
+public class BoundLazy<OldType, BoundContainedType>
+		implements IHolder<BoundContainedType> {
+	/*
+	 * The old value
+	 */
+	private Supplier<IHolder<OldType>>						oldSupplier;
+
+	/*
+	 * The function to use to transform the old value into a new value
+	 */
+	private Function<OldType, IHolder<BoundContainedType>>	binder;
+
+	/*
+	 * The bound value being held
+	 */
+	private IHolder<BoundContainedType>						boundHolder;
+
+	/*
+	 * Whether the bound value has been actualized or not
+	 */
+	private boolean											holderBound;
+
+	/*
+	 * Transformations currently pending on the bound value
+	 */
+	private IList<UnaryOperator<BoundContainedType>>		actions	= new FunctionalList<>();
+
+	/*
+	 * Create a new bound lazy value
+	 */
+	public BoundLazy(Supplier<IHolder<OldType>> supp,
+			Function<OldType, IHolder<BoundContainedType>> binder) {
+		oldSupplier = supp;
+		this.binder = binder;
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(
+			Function<BoundContainedType, IHolder<BoundType>> bindr) {
+		if (bindr == null) {
+			throw new NullPointerException("Binder must not be null");
+		}
+
+		/*
+		 * Prepare a list of pending actions
+		 */
+		IList<UnaryOperator<BoundContainedType>> pendingActions = new FunctionalList<>();
+		actions.forEach(pendingActions::add);
+
+		/*
+		 * Create the new supplier of a value
+		 */
+		Supplier<IHolder<BoundContainedType>> typeSupplier = () -> {
+			IHolder<BoundContainedType> oldHolder = boundHolder;
+
+			/*
+			 * Bind the value if it hasn't been bound before
+			 */
+			if (!holderBound) {
+				oldHolder = oldSupplier.get().unwrap(binder);
+			}
+
+			/*
+			 * Apply all the pending actions
+			 */
+			return pendingActions.reduceAux(oldHolder, (action, state) -> {
+				return state.transform(action);
+			}, (value) -> value);
+		};
+
+		return new BoundLazy<>(typeSupplier, bindr);
+	}
+
+	@Override
+	public <NewType> Function<BoundContainedType, IHolder<NewType>> lift(
+			Function<BoundContainedType, NewType> func) {
+		if (func == null) {
+			throw new NullPointerException(
+					"Function to lift must not be null");
+		}
+
+		return (val) -> {
+			return new Lazy<>(func.apply(val));
+		};
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(
+			Function<BoundContainedType, MappedType> mapper) {
+		if (mapper == null) {
+			throw new NullPointerException("Mapper must not be null");
+		}
+
+		// Prepare a list of pending actions
+		IList<UnaryOperator<BoundContainedType>> pendingActions = new FunctionalList<>();
+		actions.forEach(pendingActions::add);
+
+		// Prepare the new supplier
+		Supplier<MappedType> typeSupplier = () -> {
+			IHolder<BoundContainedType> oldHolder = boundHolder;
+
+			// Bound the value if it hasn't been bound
+			if (!holderBound) {
+				oldHolder = oldSupplier.get().unwrap(binder);
+			}
+
+			return pendingActions.reduceAux(oldHolder.getValue(),
+					(action, state) -> {
+						return action.apply(state);
+					}, (value) -> mapper.apply(value));
+		};
+
+		return new Lazy<>(typeSupplier);
+	}
+
+	@Override
+	public String toString() {
+		if (holderBound) {
+			return boundHolder.toString();
+		}
+
+		return "(unmaterialized)";
+	}
+
+	@Override
+	public IHolder<BoundContainedType> transform(
+			UnaryOperator<BoundContainedType> transformer) {
+		if (transformer == null) {
+			throw new NullPointerException("Transformer must not be null");
+		}
+
+		actions.add(transformer);
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(
+			Function<BoundContainedType, UnwrappedType> unwrapper) {
+		if (unwrapper == null) {
+			throw new NullPointerException("Unwrapper must not be null");
+		}
+
+		if (!holderBound) {
+			boundHolder = oldSupplier.get().unwrap(binder::apply);
+		}
+
+		return boundHolder.unwrap(unwrapper);
+	}
+}
\ No newline at end of file
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundLazyPair.java b/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundLazyPair.java
new file mode 100644
index 0000000..977fb37
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundLazyPair.java
@@ -0,0 +1,241 @@
+package bjc.utils.data.internals;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+import bjc.utils.data.IHolder;
+import bjc.utils.data.IPair;
+import bjc.utils.data.Identity;
+import bjc.utils.data.LazyPair;
+
+/**
+ * Implements a lazy pair that has been bound
+ */
+public class BoundLazyPair<OldLeft, OldRight, NewLeft, NewRight>
+		implements IPair<NewLeft, NewRight> {
+	/*
+	 * The supplier of the left value
+	 */
+	private Supplier<OldLeft>										leftSupplier;
+	/*
+	 * The supplier of the right value
+	 */
+	private Supplier<OldRight>										rightSupplier;
+
+	/*
+	 * The binder to transform values
+	 */
+	private BiFunction<OldLeft, OldRight, IPair<NewLeft, NewRight>>	binder;
+
+	/*
+	 * The bound pair
+	 */
+	private IPair<NewLeft, NewRight>								boundPair;
+
+	/*
+	 * Whether the pair has been bound yet
+	 */
+	private boolean													pairBound;
+
+	public BoundLazyPair(Supplier<OldLeft> leftSupp,
+			Supplier<OldRight> rightSupp,
+			BiFunction<OldLeft, OldRight, IPair<NewLeft, NewRight>> bindr) {
+		leftSupplier = leftSupp;
+		rightSupplier = rightSupp;
+		binder = bindr;
+	}
+
+	@Override
+	public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind(
+			BiFunction<NewLeft, NewRight, IPair<BoundLeft, BoundRight>> bindr) {
+		if (bindr == null) {
+			throw new NullPointerException("Binder must not be null");
+		}
+
+		IHolder<IPair<NewLeft, NewRight>> newPair = new Identity<>(
+				boundPair);
+		IHolder<Boolean> newPairMade = new Identity<>(pairBound);
+
+		Supplier<NewLeft> leftSupp = () -> {
+			if (!newPairMade.getValue()) {
+				newPair.replace(binder.apply(leftSupplier.get(),
+						rightSupplier.get()));
+
+				newPairMade.replace(true);
+			}
+
+			return newPair.unwrap((pair) -> pair.getLeft());
+		};
+
+		Supplier<NewRight> rightSupp = () -> {
+			if (!newPairMade.getValue()) {
+				newPair.replace(binder.apply(leftSupplier.get(),
+						rightSupplier.get()));
+
+				newPairMade.replace(true);
+			}
+
+			return newPair.unwrap((pair) -> pair.getRight());
+		};
+
+		return new BoundLazyPair<>(leftSupp, rightSupp, bindr);
+	}
+
+	@Override
+	public <BoundLeft> IPair<BoundLeft, NewRight> bindLeft(
+			Function<NewLeft, IPair<BoundLeft, NewRight>> leftBinder) {
+		if (leftBinder == null) {
+			throw new NullPointerException("Left binder must not be null");
+		}
+
+		Supplier<NewLeft> leftSupp = () -> {
+			IPair<NewLeft, NewRight> newPair = boundPair;
+
+			if (!pairBound) {
+				newPair = binder.apply(leftSupplier.get(),
+						rightSupplier.get());
+			}
+
+			return newPair.getLeft();
+		};
+
+		return new HalfBoundLazyPair<>(leftSupp, leftBinder);
+	}
+
+	@Override
+	public <BoundRight> IPair<NewLeft, BoundRight> bindRight(
+			Function<NewRight, IPair<NewLeft, BoundRight>> rightBinder) {
+		if (rightBinder == null) {
+			throw new NullPointerException(
+					"Right binder must not be null");
+		}
+
+		Supplier<NewRight> rightSupp = () -> {
+			IPair<NewLeft, NewRight> newPair = boundPair;
+
+			if (!pairBound) {
+				newPair = binder.apply(leftSupplier.get(),
+						rightSupplier.get());
+			}
+
+			return newPair.getRight();
+		};
+
+		return new HalfBoundLazyPair<>(rightSupp, rightBinder);
+	}
+
+	@Override
+	public <OtherLeft, OtherRight, CombinedLeft, CombinedRight> IPair<CombinedLeft, CombinedRight> combine(
+			IPair<OtherLeft, OtherRight> otherPair,
+			BiFunction<NewLeft, OtherLeft, CombinedLeft> leftCombiner,
+			BiFunction<NewRight, OtherRight, CombinedRight> rightCombiner) {
+		if (otherPair == null) {
+			throw new NullPointerException("Other pair must not be null");
+		} else if (leftCombiner == null) {
+			throw new NullPointerException(
+					"Left combiner must not be null");
+		} else if (rightCombiner == null) {
+			throw new NullPointerException(
+					"Right combiner must not be null");
+		}
+
+		return otherPair.bind((otherLeft, otherRight) -> {
+			return bind((leftVal, rightVal) -> {
+				return new LazyPair<>(
+						leftCombiner.apply(leftVal, otherLeft),
+						rightCombiner.apply(rightVal, otherRight));
+			});
+		});
+	}
+
+	@Override
+	public <NewLeftType> IPair<NewLeftType, NewRight> mapLeft(
+			Function<NewLeft, NewLeftType> mapper) {
+		if (mapper == null) {
+			throw new NullPointerException("Mapper must not be null");
+		}
+
+		Supplier<NewLeftType> leftSupp = () -> {
+			if (!pairBound) {
+				NewLeft leftVal = binder
+						.apply(leftSupplier.get(), rightSupplier.get())
+						.getLeft();
+
+				return mapper.apply(leftVal);
+			}
+
+			return mapper.apply(boundPair.getLeft());
+		};
+
+		Supplier<NewRight> rightSupp = () -> {
+			if (!pairBound) {
+				return binder
+						.apply(leftSupplier.get(), rightSupplier.get())
+						.getRight();
+			}
+
+			return boundPair.getRight();
+		};
+
+		return new LazyPair<>(leftSupp, rightSupp);
+	}
+
+	@Override
+	public <NewRightType> IPair<NewLeft, NewRightType> mapRight(
+			Function<NewRight, NewRightType> mapper) {
+		if (mapper == null) {
+			throw new NullPointerException("Mapper must not be null");
+		}
+
+		Supplier<NewLeft> leftSupp = () -> {
+			if (!pairBound) {
+				return binder
+						.apply(leftSupplier.get(), rightSupplier.get())
+						.getLeft();
+			}
+
+			return boundPair.getLeft();
+		};
+
+		Supplier<NewRightType> rightSupp = () -> {
+			if (!pairBound) {
+				NewRight rightVal = binder
+						.apply(leftSupplier.get(), rightSupplier.get())
+						.getRight();
+
+				return mapper.apply(rightVal);
+			}
+
+			return mapper.apply(boundPair.getRight());
+		};
+
+		return new LazyPair<>(leftSupp, rightSupp);
+	}
+
+	@Override
+	public <MergedType> MergedType merge(
+			BiFunction<NewLeft, NewRight, MergedType> merger) {
+		if (merger == null) {
+			throw new NullPointerException("Merger must not be null");
+		}
+
+		if (!pairBound) {
+			boundPair = binder.apply(leftSupplier.get(),
+					rightSupplier.get());
+
+			pairBound = true;
+		}
+
+		return boundPair.merge(merger);
+	}
+
+	@Override
+	public String toString() {
+		if (pairBound) {
+			return boundPair.toString();
+		}
+
+		return "(un-materialized)";
+	}
+}
\ No newline at end of file
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundListHolder.java b/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundListHolder.java
new file mode 100644
index 0000000..7a3eaa8
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/internals/BoundListHolder.java
@@ -0,0 +1,86 @@
+package bjc.utils.data.internals;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+import bjc.utils.data.IHolder;
+import bjc.utils.data.ListHolder;
+import bjc.utils.funcdata.IList;
+
+/*
+ * Holds a list, converted into a holder
+ */
+public class BoundListHolder<ContainedType> implements IHolder<ContainedType> {
+	private IList<IHolder<ContainedType>> heldHolders;
+
+	public BoundListHolder(IList<IHolder<ContainedType>> toHold) {
+		heldHolders = toHold;
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(
+			Function<ContainedType, IHolder<BoundType>> binder) {
+		if (binder == null) {
+			throw new NullPointerException("Binder must not be null");
+		}
+
+		IList<IHolder<BoundType>> boundHolders = heldHolders
+				.map((containedHolder) -> {
+					return containedHolder.bind(binder);
+				});
+
+		return new BoundListHolder<>(boundHolders);
+	}
+
+	@Override
+	public <NewType> Function<ContainedType, IHolder<NewType>> lift(
+			Function<ContainedType, NewType> func) {
+		if (func == null) {
+			throw new NullPointerException(
+					"Function to lift must not be null");
+		}
+
+		return (val) -> {
+			return new ListHolder<>(func.apply(val));
+		};
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(
+			Function<ContainedType, MappedType> mapper) {
+		if (mapper == null) {
+			throw new NullPointerException("Mapper must not be null");
+		}
+
+		IList<IHolder<MappedType>> mappedHolders = heldHolders
+				.map((containedHolder) -> {
+					return containedHolder.map(mapper);
+				});
+
+		return new BoundListHolder<>(mappedHolders);
+	}
+
+	@Override
+	public IHolder<ContainedType> transform(
+			UnaryOperator<ContainedType> transformer) {
+		if (transformer == null) {
+			throw new NullPointerException("Transformer must not be null");
+		}
+
+		heldHolders.forEach((containedHolder) -> {
+			containedHolder.transform(transformer);
+		});
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(
+			Function<ContainedType, UnwrappedType> unwrapper) {
+		if (unwrapper == null) {
+			throw new NullPointerException("Unwrapper must not be null");
+		}
+
+		return heldHolders.randItem().unwrap(unwrapper);
+	}
+}
\ No newline at end of file
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/internals/HalfBoundLazyPair.java b/BJC-Utils2/src/main/java/bjc/utils/data/internals/HalfBoundLazyPair.java
new file mode 100644
index 0000000..1e8d109
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/internals/HalfBoundLazyPair.java
@@ -0,0 +1,163 @@
+package bjc.utils.data.internals;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+import bjc.utils.data.IHolder;
+import bjc.utils.data.IPair;
+import bjc.utils.data.Identity;
+import bjc.utils.data.LazyPair;
+
+/*
+ * A lazy pair, with only one side bound
+ */
+public class HalfBoundLazyPair<OldType, NewLeft, NewRight>
+		implements IPair<NewLeft, NewRight> {
+	private Supplier<OldType>							oldSupplier;
+
+	private Function<OldType, IPair<NewLeft, NewRight>>	binder;
+
+	private IPair<NewLeft, NewRight>					boundPair;
+	private boolean										pairBound;
+
+	public HalfBoundLazyPair(Supplier<OldType> oldSupp,
+			Function<OldType, IPair<NewLeft, NewRight>> bindr) {
+		oldSupplier = oldSupp;
+		binder = bindr;
+	}
+
+	@Override
+	public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind(
+			BiFunction<NewLeft, NewRight, IPair<BoundLeft, BoundRight>> bindr) {
+		IHolder<IPair<NewLeft, NewRight>> newPair = new Identity<>(
+				boundPair);
+		IHolder<Boolean> newPairMade = new Identity<>(pairBound);
+
+		Supplier<NewLeft> leftSupp = () -> {
+			if (!newPairMade.getValue()) {
+				newPair.replace(binder.apply(oldSupplier.get()));
+				newPairMade.replace(true);
+			}
+
+			return newPair.unwrap((pair) -> pair.getLeft());
+		};
+
+		Supplier<NewRight> rightSupp = () -> {
+			if (!newPairMade.getValue()) {
+				newPair.replace(binder.apply(oldSupplier.get()));
+				newPairMade.replace(true);
+			}
+
+			return newPair.unwrap((pair) -> pair.getRight());
+		};
+
+		return new BoundLazyPair<>(leftSupp, rightSupp, bindr);
+	}
+
+	@Override
+	public <BoundLeft> IPair<BoundLeft, NewRight> bindLeft(
+			Function<NewLeft, IPair<BoundLeft, NewRight>> leftBinder) {
+		Supplier<NewLeft> leftSupp = () -> {
+			IPair<NewLeft, NewRight> newPair = boundPair;
+
+			if (!pairBound) {
+				newPair = binder.apply(oldSupplier.get());
+			}
+
+			return newPair.getLeft();
+		};
+
+		return new HalfBoundLazyPair<>(leftSupp, leftBinder);
+	}
+
+	@Override
+	public <BoundRight> IPair<NewLeft, BoundRight> bindRight(
+			Function<NewRight, IPair<NewLeft, BoundRight>> rightBinder) {
+		Supplier<NewRight> rightSupp = () -> {
+			IPair<NewLeft, NewRight> newPair = boundPair;
+
+			if (!pairBound) {
+				newPair = binder.apply(oldSupplier.get());
+			}
+
+			return newPair.getRight();
+		};
+
+		return new HalfBoundLazyPair<>(rightSupp, rightBinder);
+	}
+
+	@Override
+	public <OtherLeft, OtherRight, CombinedLeft, CombinedRight> IPair<CombinedLeft, CombinedRight> combine(
+			IPair<OtherLeft, OtherRight> otherPair,
+			BiFunction<NewLeft, OtherLeft, CombinedLeft> leftCombiner,
+			BiFunction<NewRight, OtherRight, CombinedRight> rightCombiner) {
+		return otherPair.bind((otherLeft, otherRight) -> {
+			return bind((leftVal, rightVal) -> {
+				return new LazyPair<>(
+						leftCombiner.apply(leftVal, otherLeft),
+						rightCombiner.apply(rightVal, otherRight));
+			});
+		});
+	}
+
+	@Override
+	public <NewLeftType> IPair<NewLeftType, NewRight> mapLeft(
+			Function<NewLeft, NewLeftType> mapper) {
+		Supplier<NewLeftType> leftSupp = () -> {
+			if (pairBound) {
+				return mapper.apply(boundPair.getLeft());
+			}
+
+			NewLeft leftVal = binder.apply(oldSupplier.get()).getLeft();
+
+			return mapper.apply(leftVal);
+		};
+
+		Supplier<NewRight> rightSupp = () -> {
+			if (pairBound) {
+				return boundPair.getRight();
+			}
+
+			return binder.apply(oldSupplier.get()).getRight();
+		};
+
+		return new LazyPair<>(leftSupp, rightSupp);
+	}
+
+	@Override
+	public <NewRightType> IPair<NewLeft, NewRightType> mapRight(
+			Function<NewRight, NewRightType> mapper) {
+		Supplier<NewLeft> leftSupp = () -> {
+			if (pairBound) {
+				return boundPair.getLeft();
+			}
+
+			return binder.apply(oldSupplier.get()).getLeft();
+		};
+
+		Supplier<NewRightType> rightSupp = () -> {
+			if (pairBound) {
+				return mapper.apply(boundPair.getRight());
+			}
+
+			NewRight rightVal = binder.apply(oldSupplier.get()).getRight();
+
+			return mapper.apply(rightVal);
+		};
+
+		return new LazyPair<>(leftSupp, rightSupp);
+	}
+
+	@Override
+	public <MergedType> MergedType merge(
+			BiFunction<NewLeft, NewRight, MergedType> merger) {
+		if (!pairBound) {
+			boundPair = binder.apply(oldSupplier.get());
+
+			pairBound = true;
+		}
+
+		return boundPair.merge(merger);
+	}
+}
\ No newline at end of file
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/internals/WrappedLazy.java b/BJC-Utils2/src/main/java/bjc/utils/data/internals/WrappedLazy.java
new file mode 100644
index 0000000..7f0b8db
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/internals/WrappedLazy.java
@@ -0,0 +1,62 @@
+package bjc.utils.data.internals;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+import bjc.utils.data.IHolder;
+import bjc.utils.data.Lazy;
+
+public class WrappedLazy<ContainedType> implements IHolder<ContainedType> {
+	private IHolder<IHolder<ContainedType>> held;
+
+	public WrappedLazy(IHolder<ContainedType> wrappedHolder) {
+		held = new Lazy<>(wrappedHolder);
+	}
+
+	// This has an extra parameter, because otherwise it erases to the same
+	// as the public one
+	private WrappedLazy(IHolder<IHolder<ContainedType>> wrappedHolder, boolean dummy) {
+		held = 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 <NewType> Function<ContainedType, IHolder<NewType>> lift(Function<ContainedType, NewType> func) {
+		return (val) -> {
+			return new Lazy<>(func.apply(val));
+		};
+	}
+
+	@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) {
+		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);
+		});
+	}
+}
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/internals/WrappedOption.java b/BJC-Utils2/src/main/java/bjc/utils/data/internals/WrappedOption.java
new file mode 100644
index 0000000..65c2463
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/internals/WrappedOption.java
@@ -0,0 +1,83 @@
+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 IHolder<IHolder<ContainedType>> held;
+
+	public WrappedOption(IHolder<ContainedType> seedValue) {
+		held = new Option<>(seedValue);
+	}
+
+	private WrappedOption(IHolder<IHolder<ContainedType>> toHold, boolean dummy) {
+		held = toHold;
+	}
+
+	@Override public <BoundType> IHolder<BoundType> bind(Function<ContainedType, IHolder<BoundType>> binder) {
+		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(Function<ContainedType, NewType> func) {
+		return (val) -> {
+			return new Option<>(func.apply(val));
+		};
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(Function<ContainedType, MappedType> mapper) {
+		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(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(Function<ContainedType, UnwrappedType> unwrapper) {
+		return held.unwrap((containedHolder) -> {
+			return containedHolder.unwrap((containedValue) -> {
+				if (containedValue == null) {
+					return null;
+				}
+
+				return unwrapper.apply(containedValue);
+			});
+		});
+	}
+}