712     public boolean isRootModule(ModuleSymbol module) {

   712     public boolean isRootModule(ModuleSymbol module) {

   713         Assert.checkNonNull(rootModules);

   713         Assert.checkNonNull(rootModules);

   714         return rootModules.contains(module);

   714         return rootModules.contains(module);

   715     }

   715     }

   716 

   716 

   717     class ModuleVisitor extends JCTree.Visitor {

   722     class ModuleVisitor extends JCTree.Visitor {

   718         private ModuleSymbol sym;

   723         private ModuleSymbol sym;

   719         private final Set<ModuleSymbol> allRequires = new HashSet<>();

   724         private final Set<ModuleSymbol> allRequires = new HashSet<>();

   720         private final Map<PackageSymbol,List<ExportsDirective>> allExports = new HashMap<>();

   725         private final Map<PackageSymbol,List<ExportsDirective>> allExports = new HashMap<>();

   721         private final Map<PackageSymbol,List<OpensDirective>> allOpens = new HashMap<>();

   726         private final Map<PackageSymbol,List<OpensDirective>> allOpens = new HashMap<>();