Added null checks to Unit's methods, including the new methods.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/org/unitConverter/unit/FunctionalUnit.java b/src/org/unitConverter/unit/FunctionalUnit.java
index c2aae6d..e3db43a 100644
--- a/src/org/unitConverter/unit/FunctionalUnit.java
+++ b/src/org/unitConverter/unit/FunctionalUnit.java
@@ -16,6 +16,7 @@
  */
 package org.unitConverter.unit;
 
+import java.util.Objects;
 import java.util.function.DoubleUnaryOperator;
 
 /**
@@ -38,6 +39,8 @@ final class FunctionalUnit extends AbstractUnit {
 	 *            base.
 	 * @return a unit that uses the provided functions to convert.
 	 * @since 2019-05-22
+	 * @throws NullPointerException
+	 *             if any argument is null
 	 */
 	public static FunctionalUnit valueOf(final BaseUnit base, final DoubleUnaryOperator converterFrom,
 			final DoubleUnaryOperator converterTo) {
@@ -69,13 +72,15 @@ final class FunctionalUnit extends AbstractUnit {
 	 * @param converterTo
 	 *            function that accepts a value expressed in the unit and returns that value expressed in the unit's
 	 *            base.
+	 * @throws NullPointerException
+	 *             if any argument is null
 	 * @since 2019-05-22
 	 */
 	private FunctionalUnit(final BaseUnit base, final DoubleUnaryOperator converterFrom,
 			final DoubleUnaryOperator converterTo) {
 		super(base);
-		this.converterFrom = converterFrom;
-		this.converterTo = converterTo;
+		this.converterFrom = Objects.requireNonNull(converterFrom, "converterFrom must not be null.");
+		this.converterTo = Objects.requireNonNull(converterTo, "converterTo must not be null.");
 	}
 
 	@Override