diff options
Diffstat (limited to 'src/unitConverter/unit/UnitSystem.java')
| -rwxr-xr-x | src/unitConverter/unit/UnitSystem.java | 9 |
1 files changed, 8 insertions, 1 deletions
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 |