Elements. Store classes / enums / etc directly in LibraryElementImpl.

Add them when building or reading.

Change-Id: I11b57f28c4803f7e60d280d6fd4a925b0c46fb60
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/393908
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

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

@@ -6400,6 +6400,24 @@ class LibraryElementImpl extends ElementImpl
   @override
   int nameLength;
 
+  @override
+  List<ClassElementImpl2> classes = [];
+
+  @override
+  List<EnumElementImpl2> enums = [];
+
+  @override
+  List<ExtensionElementImpl2> extensions = [];
+
+  @override
+  List<ExtensionTypeElementImpl2> extensionTypes = [];
+
+  @override
+  List<TopLevelFunctionElementImpl> functions = [];
+
+  @override
+  List<MixinElementImpl2> mixins = [];
+
   /// The export [Namespace] of this library, `null` if it has not been
   /// computed yet.
   Namespace? _exportNamespace;
@@ -6447,15 +6465,6 @@ class LibraryElementImpl extends ElementImpl
     ];
   }
 
-  @override
-  List<ClassElementImpl2> get classes {
-    return units
-        .expand((fragment) => fragment.classes)
-        .map((fragment) => fragment.element)
-        .toSet()
-        .toList();
-  }
-
   @override
   CompilationUnitElementImpl get definingCompilationUnit =>
       _definingCompilationUnit;
@@ -6488,15 +6497,6 @@ class LibraryElementImpl extends ElementImpl
   TopLevelFunctionElement? get entryPoint2 =>
       entryPoint as TopLevelFunctionElement?;
 
-  @override
-  List<EnumElementImpl2> get enums {
-    return units
-        .expand((fragment) => fragment.enums)
-        .map((fragment) => fragment.element)
-        .toSet()
-        .toList();
-  }
-
   @override
   List<LibraryElementImpl> get exportedLibraries {
     return fragments
@@ -6521,24 +6521,6 @@ class LibraryElementImpl extends ElementImpl
     _exportNamespace = exportNamespace;
   }
 
-  @override
-  List<ExtensionElementImpl2> get extensions {
-    return units
-        .expand((fragment) => fragment.extensions)
-        .map((fragment) => fragment.element)
-        .toSet()
-        .toList();
-  }
-
-  @override
-  List<ExtensionTypeElementImpl2> get extensionTypes {
-    return units
-        .expand((fragment) => fragment.extensionTypes)
-        .map((fragment) => fragment.element)
-        .toSet()
-        .toList();
-  }
-
   /// Information about why non-promotable private fields in the library are not
   /// promotable.
   ///
@@ -6583,15 +6565,6 @@ class LibraryElementImpl extends ElementImpl
     ];
   }
 
-  @override
-  List<TopLevelFunctionElementImpl> get functions {
-    return units
-        .expand((fragment) => fragment.functions)
-        .map((fragment) => fragment.element as TopLevelFunctionElementImpl)
-        .toSet()
-        .toList();
-  }
-
   @override
   List<GetterElement> get getters {
     var declarations = <GetterElement>{};
@@ -6678,15 +6651,6 @@ class LibraryElementImpl extends ElementImpl
     return super.metadata;
   }
 
-  @override
-  List<MixinElementImpl2> get mixins {
-    return units
-        .expand((fragment) => fragment.mixins)
-        .map((fragment) => fragment.element)
-        .toSet()
-        .toList();
-  }
-
   @override
   String get name => super.name!;