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.
---
 src/main/java/bjc/data/ListHolder.java | 105 +++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/main/java/bjc/data/ListHolder.java

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

diff --git a/src/main/java/bjc/data/ListHolder.java b/src/main/java/bjc/data/ListHolder.java
new file mode 100644
index 0000000..077c0fb
--- /dev/null
+++ b/src/main/java/bjc/data/ListHolder.java
@@ -0,0 +1,105 @@
+package bjc.data;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+import bjc.data.internals.BoundListHolder;
+import bjc.funcdata.FunctionalList;
+import bjc.funcdata.IList;
+
+/**
+ * A holder that represents a set of non-deterministic computations.
+ *
+ * @author ben
+ *
+ * @param <ContainedType>
+ *        The type of contained value.
+ */
+public class ListHolder<ContainedType> implements IHolder<ContainedType> {
+	private IList<ContainedType> heldValues;
+
+	/**
+	 * Create a new list holder.
+	 *
+	 * @param values
+	 *        The possible values for the computation.
+	 */
+	@SafeVarargs
+	public ListHolder(final ContainedType... values) {
+		heldValues = new FunctionalList<>();
+
+		if(values != null) {
+			for(final ContainedType containedValue : values) {
+				heldValues.add(containedValue);
+			}
+		}
+	}
+
+	/* Create a new holder with values. */
+	private ListHolder(final IList<ContainedType> toHold) {
+		heldValues = toHold;
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(final Function<ContainedType, IHolder<BoundType>> binder) {
+		final IList<IHolder<BoundType>> boundValues = heldValues.map(binder);
+
+		return new BoundListHolder<>(boundValues);
+	}
+
+	@Override
+	public <NewType> Function<ContainedType, IHolder<NewType>> lift(final Function<ContainedType, NewType> func) {
+		return val -> {
+			return new ListHolder<>(new FunctionalList<>(func.apply(val)));
+		};
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(final Function<ContainedType, MappedType> mapper) {
+		final IList<MappedType> mappedValues = heldValues.map(mapper);
+
+		return new ListHolder<>(mappedValues);
+	}
+
+	@Override
+	public IHolder<ContainedType> transform(final UnaryOperator<ContainedType> transformer) {
+		heldValues = heldValues.map(transformer);
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(final Function<ContainedType, UnwrappedType> unwrapper) {
+		return unwrapper.apply(heldValues.randItem());
+	}
+
+	@Override
+	public String toString() {
+		return String.format("ListHolder [heldValues=%s]", heldValues);
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+
+		result = prime * result + (heldValues == null ? 0 : heldValues.hashCode());
+
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if(this == obj) return true;
+		if(obj == null) return false;
+		if(!(obj instanceof ListHolder<?>)) return false;
+
+		final ListHolder<?> other = (ListHolder<?>) obj;
+
+		if(heldValues == null) {
+			if(other.heldValues != null) return false;
+		} else if(!heldValues.equals(other.heldValues)) return false;
+
+		return true;
+	}
+}
-- 
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