From 1c8bc7132d980c1ff2dbd6b9af579c3b2fd8c63e Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Sun, 3 Apr 2016 19:22:48 -0400
Subject: General code refactoring and maintenance

---
 .../java/bjc/utils/funcdata/bst/BinarySearchTreeLeaf.java    | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'BJC-Utils2/src/main/java/bjc/utils/funcdata/bst/BinarySearchTreeLeaf.java')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/bst/BinarySearchTreeLeaf.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/bst/BinarySearchTreeLeaf.java
index 7e31328..d2f9013 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/funcdata/bst/BinarySearchTreeLeaf.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/bst/BinarySearchTreeLeaf.java
@@ -55,6 +55,10 @@ public class BinarySearchTreeLeaf<T> implements ITreePart<T> {
 	@Override
 	public <E> E collapse(Function<T, E> leafTransformer,
 			BiFunction<E, E, E> branchCollapser) {
+		if (leafTransformer == null) {
+			throw new NullPointerException("Transformer must not be null");
+		}
+
 		return leafTransformer.apply(data);
 	}
 
@@ -101,6 +105,10 @@ public class BinarySearchTreeLeaf<T> implements ITreePart<T> {
 	 */
 	@Override
 	public boolean directedWalk(DirectedWalkFunction<T> treeWalker) {
+		if (treeWalker == null) {
+			throw new NullPointerException("Tree walker must not be null");
+		}
+
 		switch (treeWalker.walk(data)) {
 			case SUCCESS:
 				return true;
@@ -119,6 +127,10 @@ public class BinarySearchTreeLeaf<T> implements ITreePart<T> {
 	@Override
 	public boolean forEach(TreeLinearizationMethod linearizationMethod,
 			Predicate<T> traversalPredicate) {
+		if (traversalPredicate == null) {
+			throw new NullPointerException("Predicate must not be null");
+		}
+
 		return traversalPredicate.test(data);
 	}
 }
-- 
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