Elements. Migrate CreateMixin.

Change-Id: Ife4570d0851e374e3c0e178c0a355f6ead2679c6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/389263
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Phil Quitslund <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: scheglov

pkg/analysis_server/analyzer_use_new_elements.txt

@@ -306,6 +306,7 @@ lib/src/services/correction/dart/create_getter.dart
 lib/src/services/correction/dart/create_local_variable.dart
 lib/src/services/correction/dart/create_method.dart
 lib/src/services/correction/dart/create_method_or_function.dart
+lib/src/services/correction/dart/create_mixin.dart
 lib/src/services/correction/dart/create_no_such_method.dart
 lib/src/services/correction/dart/create_parameter.dart
 lib/src/services/correction/dart/create_setter.dart

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

@@ -5,7 +5,7 @@
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analysis_server_plugin/edit/dart/correction_producer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/element2.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
 import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
@@ -29,12 +29,12 @@ class CreateMixin extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    Element? prefixElement;
+    Element2? prefixElement;
     var node = this.node;
     if (node is NamedType) {
       var importPrefix = node.importPrefix;
       if (importPrefix != null) {
-        prefixElement = importPrefix.element;
+        prefixElement = importPrefix.element2;
         if (prefixElement == null) {
           return;
         }
@@ -57,7 +57,7 @@ class CreateMixin extends ResolvedCorrectionProducer {
       if (node.parent is InstanceCreationExpression) {
         return;
       }
-      prefixElement = node.prefix.staticElement;
+      prefixElement = node.prefix.element;
       if (prefixElement == null) {
         return;
       }
@@ -66,13 +66,13 @@ class CreateMixin extends ResolvedCorrectionProducer {
       return;
     }
     // prepare environment
-    Element targetUnit;
+    LibraryFragment targetUnit;
     var prefix = '';
     var suffix = '';
     var offset = -1;
     String? filePath;
     if (prefixElement == null) {
-      targetUnit = unit.declaredElement!;
+      targetUnit = unit.declaredFragment!;
       var enclosingMember = node.thisOrAncestorMatching((node) =>
           node is CompilationUnitMember && node.parent is CompilationUnit);
       if (enclosingMember == null) {
@@ -82,19 +82,16 @@ class CreateMixin extends ResolvedCorrectionProducer {
       filePath = file;
       prefix = '$eol$eol';
     } else {
-      for (var import
-          in libraryElement.definingCompilationUnit.libraryImports) {
-        if (prefixElement is PrefixElement &&
-            import.prefix?.element == prefixElement) {
-          var library = import.importedLibrary;
+      for (var import in libraryElement2.firstFragment.libraryImports2) {
+        if (prefixElement is PrefixElement2 &&
+            import.prefix2?.element == prefixElement) {
+          var library = import.importedLibrary2;
           if (library != null) {
-            targetUnit = library.definingCompilationUnit;
+            targetUnit = library.firstFragment;
             var targetSource = targetUnit.source;
             try {
-              if (targetSource != null) {
-                offset = targetSource.contents.data.length;
-                filePath = targetSource.fullName;
-              }
+              offset = targetSource.contents.data.length;
+              filePath = targetSource.fullName;
               prefix = eol;
               suffix = eol;
             } on FileSystemException {