Change LibraryElementImpl.session to AnalysisSessionImpl, export LinkedElementFactory.

Change-Id: I920659db7cbfd1e337e8fbb4c35b334aed8b404f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/247600
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

pkg/analyzer/lib/src/dart/analysis/session.dart

@@ -16,6 +16,7 @@ import 'package:analyzer/src/dart/element/inheritance_manager3.dart';
 import 'package:analyzer/src/dart/element/type_provider.dart';
 import 'package:analyzer/src/dart/element/type_system.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisOptionsImpl;
+import 'package:analyzer/src/summary2/linked_element_factory.dart';
 
 /// A concrete implementation of an analysis session.
 class AnalysisSessionImpl implements AnalysisSession {
@@ -37,6 +38,10 @@ class AnalysisSessionImpl implements AnalysisSession {
   @override
   DeclaredVariables get declaredVariables => _driver.declaredVariables;
 
+  LinkedElementFactory get elementFactory {
+    return _driver.libraryContext.elementFactory;
+  }
+
   @override
   ResourceProvider get resourceProvider => _driver.resourceProvider;
 

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

@@ -97,8 +97,7 @@ abstract class AbstractClassElementImpl extends _ExistingElementImpl
 
   @override
   List<InterfaceType> get allSupertypes {
-    var sessionImpl = library.session as AnalysisSessionImpl;
-    return sessionImpl.classHierarchy.implementedInterfaces(this);
+    return library.session.classHierarchy.implementedInterfaces(this);
   }
 
   @override
@@ -3701,7 +3700,7 @@ class LibraryElementImpl extends LibraryOrAugmentationElementImpl
   final AnalysisContext context;
 
   @override
-  AnalysisSession session;
+  AnalysisSessionImpl session;
 
   /// The language version for the library.
   LibraryLanguageVersion? _languageVersion;

pkg/analyzer/lib/src/generated/error_verifier.dart

@@ -17,7 +17,6 @@ import 'package:analyzer/dart/element/type_provider.dart';
 import 'package:analyzer/diagnostic/diagnostic.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
-import 'package:analyzer/src/dart/analysis/session.dart';
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/ast/extensions.dart';
 import 'package:analyzer/src/dart/element/class_hierarchy.dart';
@@ -1921,7 +1920,7 @@ class ErrorVerifier extends RecursiveAstVisitor<void>
   void _checkForConflictingGenerics(NamedCompilationUnitMember node) {
     var element = node.declaredElement as ClassElement;
 
-    var analysisSession = _currentLibrary.session as AnalysisSessionImpl;
+    var analysisSession = _currentLibrary.session;
     var errors = analysisSession.classHierarchy.errors(element);
 
     for (var error in errors) {

pkg/analyzer/lib/src/summary2/types_builder.dart

@@ -7,7 +7,6 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/nullability_suffix.dart';
 import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/src/dart/analysis/session.dart';
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/ast/extensions.dart';
 import 'package:analyzer/src/dart/element/class_hierarchy.dart';
@@ -573,8 +572,7 @@ class _MixinsInference {
     for (var declaration in declarations) {
       if (declaration is ClassOrMixinDeclaration) {
         var element = declaration.declaredElement as ClassElementImpl;
-        var sessionImpl = element.library.session as AnalysisSessionImpl;
-        sessionImpl.classHierarchy.remove(element);
+        element.library.session.classHierarchy.remove(element);
       }
     }
   }

pkg/analyzer/test/src/dart/element/element_test.dart

@@ -3,12 +3,12 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analyzer/dart/analysis/features.dart';
-import 'package:analyzer/dart/analysis/session.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/nullability_suffix.dart';
 import 'package:analyzer/dart/element/type.dart';
+import 'package:analyzer/src/dart/analysis/session.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
@@ -1618,7 +1618,7 @@ class VoidTypeImplTest extends AbstractTypeSystemTest {
   }
 }
 
-class _AnalysisSessionMock implements AnalysisSession {
+class _AnalysisSessionMock implements AnalysisSessionImpl {
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }