updated issue for zero divison error in boolean isEquivalentReal #295

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - Reincluded SonarQube step for Dependabot PRs [#575](https://github.com/ie3-institute/PowerSystemUtils/issues/575)
 
+### Fixed
+- updated zero divison error issue in Qualityutil[#295](https://github.com/ie3-institute/PowerSystemUtils/issues/295)
+
 ## [3.1.0]
 
 ### Added

src/main/java/edu/ie3/util/quantities/QuantityUtil.java

@@ -134,6 +134,9 @@ public static <Q extends Quantity<Q>> boolean isEquivalentRel(Quantity<Q> a, Qua
    * of both quantities' value with regard to <i>{@code a}</i>'s value. Both quantities are
    * converted into <i>{@code a}</i>'s unit before the comparison.
    *
+   * <p>If {@code a} is 0, the result is just based on strict equality with {@code b}, since no
+   * relative comparison is possible.
+   *
    * @param a First quantity to compare
    * @param b Second quantity to compare
    * @param relQuantityTolerance Permissible relative tolerance
@@ -146,6 +149,10 @@ public static <Q extends Quantity<Q>> boolean isEquivalentRel(
     double aVal = a.getValue().doubleValue();
     double bVal = b.to(a.getUnit()).getValue().doubleValue();
 
+    if (aVal == 0.0) {
+      return bVal == 0.0;
+    }
+
     return (Math.abs(aVal - bVal) / Math.abs(aVal)) <= relQuantityTolerance;
   }