From c8a00b789671d59589bcb5520c1e9d208bcc27f6 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Mon, 11 Apr 2016 21:54:44 -0400
Subject: Work on restructing data.

---
 .../main/java/bjc/utils/data/lazy/NewLazyPair.java | 202 +++++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/data/lazy/NewLazyPair.java

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

diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/lazy/NewLazyPair.java b/BJC-Utils2/src/main/java/bjc/utils/data/lazy/NewLazyPair.java
new file mode 100644
index 0000000..4bd3832
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/lazy/NewLazyPair.java
@@ -0,0 +1,202 @@
+package bjc.utils.data.lazy;
+
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+import java.util.function.Supplier;
+
+import bjc.utils.data.GenHolder;
+import bjc.utils.data.IPair;
+import bjc.utils.funcdata.FunctionalList;
+import bjc.utils.funcdata.IFunctionalList;
+
+/**
+ * New implementation of lazy pair not delegating to {@link LazyHolder}
+ * 
+ * @author ben
+ * @param <L>
+ *            The type on the left side of the pair
+ * @param <R>
+ *            The type on the right side of the pair
+ *
+ */
+public class NewLazyPair<L, R> implements IPair<L, R>, ILazy {
+	private static class BoundLazyPair<OldL, OldR, NewL, NewR>
+			implements IPair<NewL, NewR> {
+		private Supplier<OldL>								oldLeftSupplier;
+		private Supplier<OldR>								oldRightSupplier;
+
+		private BiFunction<OldL, OldR, IPair<NewL, NewR>>	newPairSupplier;
+
+		private IPair<NewL, NewR>							newPair;
+
+		private boolean										newPairMaterialized;
+
+		public BoundLazyPair(Supplier<OldL> leftSup,
+				Supplier<OldR> rightSup,
+				BiFunction<OldL, OldR, IPair<NewL, NewR>> binder) {
+			oldLeftSupplier = leftSup;
+			oldRightSupplier = rightSup;
+
+			newPairSupplier = binder;
+		}
+
+		@Override
+		public <L2, R2> IPair<L2, R2> bind(
+				BiFunction<NewL, NewR, IPair<L2, R2>> binder) {
+			// TODO Auto-generated method stub
+			return null;
+		}
+
+		@Override
+		public void doWith(BiConsumer<NewL, NewR> action) {
+			// TODO Auto-generated method stub
+
+		}
+
+		@Override
+		public <E> E merge(BiFunction<NewL, NewR, E> merger) {
+			if (!newPairMaterialized) {
+				newPair = newPairSupplier.apply(oldLeftSupplier.get(),
+						oldRightSupplier.get());
+			}
+
+			return newPair.merge(merger);
+		}
+	}
+
+	private L									leftValue;
+	private R									rightValue;
+
+	private Supplier<R>							rightValueSupplier;
+	private Supplier<L>							leftValueSupplier;
+
+	private boolean								rightMaterialized;
+	private boolean								leftMaterialized;
+
+	private IFunctionalList<BiConsumer<L, R>>	actions;
+
+	/**
+	 * Create a new lazy pair
+	 * 
+	 * @param leftVal
+	 *            The left value in the pair
+	 * @param rightVal
+	 *            The right value in the pair
+	 */
+	public NewLazyPair(L leftVal, R rightVal) {
+		leftValueSupplier = () -> leftVal;
+		rightValueSupplier = () -> rightVal;
+	}
+
+	/**
+	 * Create a new lazy pair
+	 * 
+	 * @param leftSupplier
+	 *            The supplier for the left value in the pair
+	 * @param rightSupplier
+	 *            The supplier for the right value in the pair
+	 */
+	public NewLazyPair(Supplier<L> leftSupplier,
+			Supplier<R> rightSupplier) {
+		leftValueSupplier = leftSupplier;
+		rightValueSupplier = rightSupplier;
+	}
+
+	@Override
+	public void applyPendingActions() {
+		if (!isMaterialized()) {
+			throw new UnsupportedOperationException(
+					"Can only apply actions to materialized values");
+		}
+
+		actions.forEach((action) -> {
+			action.accept(leftValue, rightValue);
+		});
+
+		actions = new FunctionalList<>();
+	}
+
+	private void applyPossiblyPendingActions(GenHolder<Boolean> hasActions,
+			IFunctionalList<BiConsumer<L, R>> pendingActions) {
+		if (hasActions.unwrap((val) -> val) == true) {
+			pendingActions.forEach((action) -> {
+				action.accept(leftValue, rightValue);
+			});
+
+			hasActions.transform((val) -> false);
+		}
+	}
+
+	@Override
+	public <L2, R2> IPair<L2, R2> bind(
+			BiFunction<L, R, IPair<L2, R2>> binder) {
+		GenHolder<Boolean> hasActions = new GenHolder<>(true);
+		IFunctionalList<BiConsumer<L, R>> pendingActions = new FunctionalList<>();
+
+		actions.forEach(pendingActions::add);
+
+		return new BoundLazyPair<>(() -> {
+			applyPossiblyPendingActions(hasActions, pendingActions);
+
+			return leftValue;
+		}, () -> {
+			applyPossiblyPendingActions(hasActions, pendingActions);
+
+			return rightValue;
+		}, binder);
+	}
+
+	@Override
+	public void doWith(BiConsumer<L, R> action) {
+		actions.add(action);
+	}
+
+	@Override
+	public boolean hasPendingActions() {
+		return !actions.isEmpty();
+	}
+
+	@Override
+	public boolean isMaterialized() {
+		if (leftValueSupplier == null) {
+			if (rightValueSupplier == null) {
+				return true;
+			}
+
+			return rightMaterialized;
+		}
+
+		if (rightValueSupplier == null) {
+			return leftMaterialized;
+		}
+
+		return leftMaterialized && rightMaterialized;
+	}
+
+	@Override
+	public void materialize() {
+		if (isMaterialized()) {
+			throw new UnsupportedOperationException(
+					"Cannot materialize lazy object twice");
+		}
+
+		if (leftValueSupplier != null) {
+			leftValue = leftValueSupplier.get();
+		}
+
+		if (rightValueSupplier != null) {
+			rightValue = rightValueSupplier.get();
+		}
+	}
+
+	@Override
+	public <E> E merge(BiFunction<L, R, E> merger) {
+		if (!isMaterialized()) {
+			materialize();
+		}
+
+		applyPendingActions();
+
+		return merger.apply(leftValue, rightValue);
+	}
+}
\ No newline at end of file
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