From 43feeeab69b723e02694a2d93eaa44c3007665e1 Mon Sep 17 00:00:00 2001
From: Adrien Hopkins <adrien.p.hopkins@gmail.com>
Date: Fri, 25 Jan 2019 17:12:18 -0500
Subject: Added unit prefixes and made SI reuse base units.

---
 src/unitConverter/unit/UnitSystem.java | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/unitConverter/unit/UnitSystem.java')

diff --git a/src/unitConverter/unit/UnitSystem.java b/src/unitConverter/unit/UnitSystem.java
index 0a50062..d641832 100755
--- a/src/unitConverter/unit/UnitSystem.java
+++ b/src/unitConverter/unit/UnitSystem.java
@@ -16,6 +16,8 @@
  */
 package unitConverter.unit;
 
+import java.util.Objects;
+
 import unitConverter.dimension.UnitDimension;
 
 /**
@@ -31,9 +33,14 @@ public interface UnitSystem {
 	 * @param dimension
 	 *            dimension used by base unit
 	 * @return base unit
+	 * @throws NullPointerException
+	 *             if dimension is null
 	 * @since 2019-01-25
 	 */
-	BaseUnit getBaseUnit(UnitDimension dimension);
+	default BaseUnit getBaseUnit(final UnitDimension dimension) {
+		Objects.requireNonNull(dimension, "dimension must not be null.");
+		return new BaseUnit(dimension, this);
+	}
 
 	/**
 	 * @return name of system
-- 
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