From d3239ea7b6945d449c0361416ab54fec6f9643e6 Mon Sep 17 00:00:00 2001
From: "Benjamin J. Culkin" <bjculkin@mix.wvu.edu>
Date: Wed, 11 Nov 2020 12:23:54 -0400
Subject: Update?

---
 src/main/java/bjc/data/Tree.java | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

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

diff --git a/src/main/java/bjc/data/Tree.java b/src/main/java/bjc/data/Tree.java
index 9a4caa6..5337af5 100644
--- a/src/main/java/bjc/data/Tree.java
+++ b/src/main/java/bjc/data/Tree.java
@@ -227,9 +227,6 @@ public class Tree<ContainedType> implements ITree<ContainedType> {
 
 	/*
 	 * Do a collapse of this tree.
-	 *
-	 * @NOTE Why is this protected? I can't see any good reason someone'd want to
-	 * override it.
 	 */
 
 	private <NewType> NewType internalCollapse(
@@ -380,6 +377,16 @@ public class Tree<ContainedType> implements ITree<ContainedType> {
 		return transformer.apply(selectedKid);
 	}
 
+	@Override
+	public ITree<ContainedType> getChild(final int childNo) {
+		if (childNo < 0 || childNo > childCount - 1) {
+			final String msg = String.format("Child index #%d is invalid", childNo);
+
+			throw new IllegalArgumentException(msg);
+		}
+		return children.getByIndex(childNo);
+	}
+
 	@Override
 	public <TransformedType> TransformedType
 			transformHead(final Function<ContainedType, TransformedType> transformer) {
-- 
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