From 0a8f34c27c6ef93c5c94d17728af62c7607e225f Mon Sep 17 00:00:00 2001
From: Ben Culkin <scorpress@gmail.com>
Date: Thu, 3 Dec 2020 19:21:38 -0500
Subject: Rename types to match Java style

This renames several interfaces that had names like IWhatever, since
that isn't a style that Java uses
---
 src/main/java/bjc/data/SimplePair.java | 154 +++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 src/main/java/bjc/data/SimplePair.java

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

diff --git a/src/main/java/bjc/data/SimplePair.java b/src/main/java/bjc/data/SimplePair.java
new file mode 100644
index 0000000..48f5ca3
--- /dev/null
+++ b/src/main/java/bjc/data/SimplePair.java
@@ -0,0 +1,154 @@
+package bjc.data;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+/**
+ * A pair of values, with nothing special about them.
+ *
+ * @author ben
+ *
+ * @param <LeftType>
+ *                    The type of the left value.
+ *
+ * @param <RightType>
+ *                    The type of the right value.
+ */
+public class SimplePair<LeftType, RightType> implements Pair<LeftType, RightType> {
+	/* The left value. */
+	private LeftType leftValue;
+	/* The right value. */
+	private RightType rightValue;
+
+	/** Create a new pair with both sides set to null. */
+	public SimplePair() {
+		// Do nothing :)
+	}
+
+	/**
+	 * Create a new pair with both sides set to the specified values.
+	 *
+	 * @param left
+	 *              The value of the left side.
+	 *
+	 * @param right
+	 *              The value of the right side.
+	 */
+	public SimplePair(final LeftType left, final RightType right) {
+		leftValue = left;
+		rightValue = right;
+	}
+
+	@Override
+	public <BoundLeft, BoundRight> Pair<BoundLeft, BoundRight> bind(
+			final BiFunction<LeftType, RightType, Pair<BoundLeft, BoundRight>> binder) {
+		if (binder == null) throw new NullPointerException("Binder must not be null.");
+
+		return binder.apply(leftValue, rightValue);
+	}
+
+	@Override
+	public <BoundLeft> Pair<BoundLeft, RightType>
+			bindLeft(final Function<LeftType, Pair<BoundLeft, RightType>> leftBinder) {
+		if (leftBinder == null) throw new NullPointerException("Binder must not be null");
+
+		return leftBinder.apply(leftValue);
+	}
+
+	@Override
+	public <BoundRight> Pair<LeftType, BoundRight> bindRight(
+			final Function<RightType, Pair<LeftType, BoundRight>> rightBinder) {
+		if (rightBinder == null) throw new NullPointerException("Binder must not be null");
+
+		return rightBinder.apply(rightValue);
+	}
+
+	@Override
+	public <OtherLeft, OtherRight, CombinedLeft, CombinedRight>
+			Pair<CombinedLeft, CombinedRight>
+			combine(final Pair<OtherLeft, OtherRight> otherPair,
+					final BiFunction<LeftType, OtherLeft, CombinedLeft> leftCombiner,
+					final BiFunction<RightType, OtherRight,
+							CombinedRight> rightCombiner) {
+		return otherPair.bind((otherLeft, otherRight) -> {
+			final CombinedLeft left = leftCombiner.apply(leftValue, otherLeft);
+			final CombinedRight right = rightCombiner.apply(rightValue, otherRight);
+
+			return new SimplePair<>(left, right);
+		});
+	}
+
+	@Override
+	public <NewLeft> Pair<NewLeft, RightType>
+			mapLeft(final Function<LeftType, NewLeft> mapper) {
+		if (mapper == null) throw new NullPointerException("Mapper must not be null");
+
+		return new SimplePair<>(mapper.apply(leftValue), rightValue);
+	}
+
+	@Override
+	public <NewRight> Pair<LeftType, NewRight>
+			mapRight(final Function<RightType, NewRight> mapper) {
+		if (mapper == null) throw new NullPointerException("Mapper must not be null");
+
+		return new SimplePair<>(leftValue, mapper.apply(rightValue));
+	}
+
+	@Override
+	public <MergedType> MergedType
+			merge(final BiFunction<LeftType, RightType, MergedType> merger) {
+		if (merger == null) throw new NullPointerException("Merger must not be null");
+
+		return merger.apply(leftValue, rightValue);
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Pair [leftValue='%s', rightValue='%s']", leftValue,
+				rightValue);
+	}
+
+	@Override
+	public LeftType getLeft() {
+		return leftValue;
+	}
+
+	@Override
+	public RightType getRight() {
+		return rightValue;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+
+		result = prime * result + (leftValue == null ? 0 : leftValue.hashCode());
+		result = prime * result + (rightValue == null ? 0 : rightValue.hashCode());
+
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)                  return true;
+		if (obj == null)                  return false;
+		if (!(obj instanceof SimplePair<?, ?>)) return false;
+
+		final SimplePair<?, ?> other = (SimplePair<?, ?>) obj;
+
+		if (leftValue == null) {
+			if (other.leftValue != null) return false;
+		} else if (!leftValue.equals(other.leftValue)) {
+			return false;
+		}
+
+		if (rightValue == null) {
+			if (other.rightValue != null) return false;
+		} else if (!rightValue.equals(other.rightValue)) {
+			return false;
+		}
+
+		return true;
+	}
+}
-- 
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