SONARKT-363 Fix ClassCastException in RedundantMethodsInDataClassesCheck

Author: Godin

kotlin-checks-test-sources/src/main/kotlin/checks/RedundantMethodsInDataClassesCheckSample.kt

@@ -188,5 +188,10 @@ class RedundantMethodsInDataClassesCheckSample {
         override fun hashCode() = this.a + a // Compliant
     }
 
+    data class Person22(val name: String, val age: Int) {
+        val a = arrayOf(name, age)
+
+        override fun hashCode() = Arrays.hashCode(a) // FN
+    }
 
 }

sonar-kotlin-checks/src/main/java/org/sonarsource/kotlin/checks/RedundantMethodsInDataClassesCheck.kt

@@ -118,7 +118,9 @@ private fun checkHashExpression(
         }
     }
     if (ARRAYS_HASHCODE_MATCHER.matches(callExpression, bindingContext)) {
-        val arguments = (callExpression.valueArguments[0].getArgumentExpression() as KtCallExpression).valueArguments
+        val argumentExpression = callExpression.valueArguments[0].getArgumentExpression()
+        if (argumentExpression !is KtCallExpression) return false
+        val arguments = argumentExpression.valueArguments
         if (arguments.size != klassParameters.size) return false
         return arguments.all {
             findParameter(it.getArgumentExpression(), klassParameters) != null