Java: add isParameterless predicate to Constructor class

Author: Jami Cogswell

java/ql/lib/semmle/code/java/Member.qll

@@ -628,6 +628,9 @@ class Constructor extends Callable, @constructor {
   /** Holds if this is a default constructor, not explicitly declared in source code. */
   predicate isDefaultConstructor() { isDefConstr(this) }
 
+  /** Holds if this is a constructor without parameters. */
+  predicate isParameterless() { this.getNumberOfParameters() = 0 }
+
   override Constructor getSourceDeclaration() { constrs(this, _, _, _, _, result) }
 
   override string getSignature() { constrs(this, _, result, _, _, _) }

java/ql/src/utils/modelgenerator/internal/CaptureModelsSpecific.qll

@@ -52,11 +52,6 @@ private predicate isJdkInternal(J::CompilationUnit cu) {
   cu.getPackage().getName() = ""
 }
 
-/** Holds if the given API is a constructor without parameters. */
-private predicate isParameterlessConstructor(J::Callable api) {
-  api instanceof J::Constructor and api.getNumberOfParameters() = 0
-}
-
 /**
  * Holds if it is relevant to generate models for `api`.
  */
@@ -65,7 +60,7 @@ private predicate isRelevantForModels(J::Callable api) {
   not isJdkInternal(api.getCompilationUnit()) and
   not api instanceof J::MainMethod and
   not api instanceof J::StaticInitializer and
-  not isParameterlessConstructor(api)
+  not api.(J::Constructor).isParameterless()
 }
 
 /**