C#: Re-factor UnsafeYearConstruction to use the new API.

Author: michaelnebel

csharp/ql/src/Likely Bugs/LeapYear/UnsafeYearConstruction.ql

@@ -10,32 +10,30 @@
  */
 
 import csharp
-import DataFlow::PathGraph
+import UnsafeYearCreationFromArithmetic::PathGraph
 
-class UnsafeYearCreationFromArithmeticConfiguration extends TaintTracking::Configuration {
-  UnsafeYearCreationFromArithmeticConfiguration() {
-    this = "UnsafeYearCreationFromArithmeticConfiguration"
-  }
-
-  override predicate isSource(DataFlow::Node source) {
+module UnsafeYearCreationFromArithmeticConfig implements DataFlow::ConfigSig {
+  predicate isSource(DataFlow::Node source) {
     exists(ArithmeticOperation ao, PropertyAccess pa | ao = source.asExpr() |
       pa = ao.getAChild*() and
       pa.getProperty().hasQualifiedName("System.DateTime", "Year")
     )
   }
 
-  override predicate isSink(DataFlow::Node sink) {
+  predicate isSink(DataFlow::Node sink) {
     exists(ObjectCreation oc |
       sink.asExpr() = oc.getArgumentForName("year") and
       oc.getObjectType().getABaseType*().hasQualifiedName("System", "DateTime")
     )
   }
 }
 
+module UnsafeYearCreationFromArithmetic =
+  TaintTracking::Global<UnsafeYearCreationFromArithmeticConfig>;
+
 from
-  UnsafeYearCreationFromArithmeticConfiguration config, DataFlow::PathNode source,
-  DataFlow::PathNode sink
-where config.hasFlowPath(source, sink)
+  UnsafeYearCreationFromArithmetic::PathNode source, UnsafeYearCreationFromArithmetic::PathNode sink
+where UnsafeYearCreationFromArithmetic::flowPath(source, sink)
 select sink, source, sink,
   "This $@ based on a 'System.DateTime.Year' property is used in a construction of a new 'System.DateTime' object, flowing to the 'year' argument.",
   source, "arithmetic operation"