From c82e3b3b2de0633317ec8fc85925e91422820597 Mon Sep 17 00:00:00 2001
From: "Benjamin J. Culkin" <bjculkin@mix.wvu.edu>
Date: Sun, 8 Oct 2017 22:39:59 -0300
Subject: Start splitting into maven modules

---
 base/src/main/java/bjc/utils/data/ListHolder.java | 104 ++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 base/src/main/java/bjc/utils/data/ListHolder.java

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

diff --git a/base/src/main/java/bjc/utils/data/ListHolder.java b/base/src/main/java/bjc/utils/data/ListHolder.java
new file mode 100644
index 0000000..142057c
--- /dev/null
+++ b/base/src/main/java/bjc/utils/data/ListHolder.java
@@ -0,0 +1,104 @@
+package bjc.utils.data;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+import bjc.utils.data.internals.BoundListHolder;
+import bjc.utils.funcdata.FunctionalList;
+import bjc.utils.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);
+			}
+		}
+	}
+
+	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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