Elements. Migrate NamespaceBuilder.

Change-Id: I3f51d6ad88528a7a7251a8c140795a442b04e5a9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/411460
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

pkg/analysis_server/lib/src/services/correction/namespace.dart

@@ -4,13 +4,15 @@
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element2.dart';
+import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/resolver/scope.dart';
 
 /// Returns the [Element2] exported from the given [LibraryElement2].
 Element2? getExportedElement(LibraryElement2? library, String name) {
   if (library == null) {
     return null;
   }
+  library as LibraryElementImpl;
   var namespace = NamespaceBuilder().createExportNamespaceForLibrary(library);
   return namespace.definedNames2[name];
 }

pkg/analyzer/api.txt

@@ -5269,7 +5269,7 @@ package:analyzer/src/dart/resolver/scope.dart:
   Namespace (class extends Object):
     EMPTY (static getter: Namespace)
     EMPTY= (static setter: Namespace)
-    new (constructor: Namespace Function(Map<String, Element>))
+    new (constructor: Namespace Function(Map<String, Element2>))
     definedNames (getter: Map<String, Element>)
     definedNames2 (getter: Map<String, Element2>)
     get (method: Element? Function(String))

pkg/analyzer/lib/src/dart/ast/ast.dart

@@ -5955,7 +5955,7 @@ final class ExportDirectiveImpl extends NamespaceDirectiveImpl
 
   @experimental
   @override
-  LibraryExport? get libraryExport => element as LibraryExport?;
+  LibraryExportElementImpl? get libraryExport => element;
 
   @override
   ChildEntities get _childEntities => super._childEntities
@@ -9973,7 +9973,7 @@ final class ImportDirectiveImpl extends NamespaceDirectiveImpl
 
   @experimental
   @override
-  LibraryImport? get libraryImport => element as LibraryImport?;
+  LibraryImportElementImpl? get libraryImport => element;
 
   @override
   SimpleIdentifierImpl? get prefix => _prefix;

pkg/analyzer/lib/src/dart/element/element.dart

@@ -7697,7 +7697,7 @@ class LibraryExportElementImpl extends _ExistingElementImpl
   }
 
   @override
-  LibraryElement2? get exportedLibrary2 => exportedLibrary;
+  LibraryElementImpl? get exportedLibrary2 => exportedLibrary;
 
   @override
   String get identifier => 'export@$nameOffset';
@@ -7769,7 +7769,7 @@ class LibraryImportElementImpl extends _ExistingElementImpl
   }
 
   @override
-  LibraryElement2? get importedLibrary2 => importedLibrary;
+  LibraryElementImpl? get importedLibrary2 => importedLibrary;
 
   @override
   ElementKind get kind => ElementKind.IMPORT;
@@ -7783,12 +7783,12 @@ class LibraryImportElementImpl extends _ExistingElementImpl
   @override
   Namespace get namespace {
     var uri = this.uri;
-    if (uri is DirectiveUriWithLibrary) {
+    if (uri is DirectiveUriWithLibraryImpl) {
       return _namespace ??=
           NamespaceBuilder().createImportNamespaceForDirective(
         importedLibrary: uri.library,
         combinators: combinators,
-        prefix: prefix?.element,
+        prefix: prefix2,
       );
     }
     return Namespace.EMPTY;