Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/analyzer/lib/src/generated/element_handle.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library engine.element_handle;
+
+import 'ast.dart';
+import 'element.dart';
+import 'engine.dart';
+import 'java_core.dart';
+import 'java_engine.dart';
+import 'resolver.dart';
+import 'source.dart';
+import 'utilities_dart.dart';
+
+/**
+ * Instances of the class `ClassElementHandle` implement a handle to a `ClassElement`.
+ */
+class ClassElementHandle extends ElementHandle implements ClassElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ClassElementHandle(ClassElement element) : super(element);
+
+  @override
+  List<PropertyAccessorElement> get accessors => actualElement.accessors;
+
+  @override
+  ClassElement get actualElement => super.actualElement as ClassElement;
+
+  @override
+  List<InterfaceType> get allSupertypes => actualElement.allSupertypes;
+
+  @override
+  List<ConstructorElement> get constructors => actualElement.constructors;
+
+  @override
+  List<FieldElement> get fields => actualElement.fields;
+
+  @override
+  bool get hasNonFinalField => actualElement.hasNonFinalField;
+
+  @override
+  bool get hasReferenceToSuper => actualElement.hasReferenceToSuper;
+
+  @override
+  bool get hasStaticMember => actualElement.hasStaticMember;
+
+  @override
+  List<InterfaceType> get interfaces => actualElement.interfaces;
+
+  @override
+  bool get isAbstract => actualElement.isAbstract;
+
+  @override
+  bool get isEnum => actualElement.isEnum;
+
+  @override
+  bool get isMixinApplication => actualElement.isMixinApplication;
+
+  @override
+  bool get isOrInheritsProxy => actualElement.isOrInheritsProxy;
+
+  @override
+  bool get isProxy => actualElement.isProxy;
+
+  @override
+  @deprecated
+  bool get isTypedef => actualElement.isMixinApplication;
+
+  @override
+  bool get isValidMixin => actualElement.isValidMixin;
+
+  @override
+  ElementKind get kind => ElementKind.CLASS;
+
+  @override
+  List<MethodElement> get methods => actualElement.methods;
+
+  @override
+  List<InterfaceType> get mixins => actualElement.mixins;
+
+  @override
+  InterfaceType get supertype => actualElement.supertype;
+
+  @override
+  InterfaceType get type => actualElement.type;
+
+  @override
+  List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
+
+  @override
+  ConstructorElement get unnamedConstructor => actualElement.unnamedConstructor;
+
+  @override
+  FieldElement getField(String fieldName) => actualElement.getField(fieldName);
+
+  @override
+  PropertyAccessorElement getGetter(String getterName) =>
+      actualElement.getGetter(getterName);
+
+  @override
+  MethodElement getMethod(String methodName) =>
+      actualElement.getMethod(methodName);
+
+  @override
+  ConstructorElement getNamedConstructor(String name) =>
+      actualElement.getNamedConstructor(name);
+
+  @override
+  PropertyAccessorElement getSetter(String setterName) =>
+      actualElement.getSetter(setterName);
+
+  @override
+  bool isSuperConstructorAccessible(ConstructorElement constructor) =>
+      actualElement.isSuperConstructorAccessible(constructor);
+
+  @override
+  MethodElement lookUpConcreteMethod(
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpConcreteMethod(methodName, library);
+
+  @override
+  PropertyAccessorElement lookUpGetter(
+          String getterName, LibraryElement library) =>
+      actualElement.lookUpGetter(getterName, library);
+
+  @override
+  PropertyAccessorElement lookUpInheritedConcreteGetter(
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedConcreteGetter(methodName, library);
+
+  @override
+  MethodElement lookUpInheritedConcreteMethod(
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedConcreteMethod(methodName, library);
+
+  @override
+  PropertyAccessorElement lookUpInheritedConcreteSetter(
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedConcreteSetter(methodName, library);
+
+  @override
+  MethodElement lookUpInheritedMethod(
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedMethod(methodName, library);
+
+  @override
+  MethodElement lookUpMethod(String methodName, LibraryElement library) =>
+      actualElement.lookUpMethod(methodName, library);
+
+  @override
+  PropertyAccessorElement lookUpSetter(
+          String setterName, LibraryElement library) =>
+      actualElement.lookUpSetter(setterName, library);
+}
+
+/**
+ * Instances of the class `CompilationUnitElementHandle` implements a handle to a
+ * [CompilationUnitElement].
+ */
+class CompilationUnitElementHandle extends ElementHandle
+    implements CompilationUnitElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  CompilationUnitElementHandle(CompilationUnitElement element) : super(element);
+
+  @override
+  List<PropertyAccessorElement> get accessors => actualElement.accessors;
+
+  @override
+  CompilationUnitElement get actualElement =>
+      super.actualElement as CompilationUnitElement;
+
+  @override
+  LibraryElement get enclosingElement =>
+      super.enclosingElement as LibraryElement;
+
+  @override
+  List<ClassElement> get enums => actualElement.enums;
+
+  @override
+  List<FunctionElement> get functions => actualElement.functions;
+
+  @override
+  List<FunctionTypeAliasElement> get functionTypeAliases =>
+      actualElement.functionTypeAliases;
+
+  @override
+  bool get hasLoadLibraryFunction => actualElement.hasLoadLibraryFunction;
+
+  @override
+  ElementKind get kind => ElementKind.COMPILATION_UNIT;
+
+  @override
+  Source get source => actualElement.source;
+
+  @override
+  List<TopLevelVariableElement> get topLevelVariables =>
+      actualElement.topLevelVariables;
+
+  @override
+  List<ClassElement> get types => actualElement.types;
+
+  @override
+  String get uri => actualElement.uri;
+
+  @override
+  int get uriEnd => actualElement.uriEnd;
+
+  @override
+  int get uriOffset => actualElement.uriOffset;
+
+  @override
+  CompilationUnit computeNode() => actualElement.computeNode();
+
+  @override
+  Element getElementAt(int offset) {
+    return actualElement.getElementAt(offset);
+  }
+
+  @override
+  ClassElement getEnum(String enumName) => actualElement.getEnum(enumName);
+
+  @override
+  ClassElement getType(String className) => actualElement.getType(className);
+}
+
+/**
+ * Instances of the class `ConstructorElementHandle` implement a handle to a
+ * `ConstructorElement`.
+ */
+class ConstructorElementHandle extends ExecutableElementHandle
+    implements ConstructorElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ConstructorElementHandle(ConstructorElement element) : super(element);
+
+  @override
+  ConstructorElement get actualElement =>
+      super.actualElement as ConstructorElement;
+
+  @override
+  ClassElement get enclosingElement => actualElement.enclosingElement;
+
+  @override
+  bool get isConst => actualElement.isConst;
+
+  @override
+  bool get isDefaultConstructor => actualElement.isDefaultConstructor;
+
+  @override
+  bool get isFactory => actualElement.isFactory;
+
+  @override
+  ElementKind get kind => ElementKind.CONSTRUCTOR;
+
+  @override
+  int get nameEnd => actualElement.nameEnd;
+
+  @override
+  int get periodOffset => actualElement.periodOffset;
+
+  @override
+  ConstructorElement get redirectedConstructor =>
+      actualElement.redirectedConstructor;
+
+  @override
+  ConstructorDeclaration computeNode() => actualElement.computeNode();
+}
+
+/**
+ * The abstract class `ElementHandle` implements the behavior common to objects that implement
+ * a handle to an [Element].
+ */
+abstract class ElementHandle implements Element {
+  /**
+   * The unique integer identifier of this element.
+   */
+  final int id = 0;
+
+  /**
+   * The context in which the element is defined.
+   */
+  AnalysisContext _context;
+
+  /**
+   * The location of this element, used to reconstitute the element if it has been garbage
+   * collected.
+   */
+  ElementLocation _location;
+
+  /**
+   * A reference to the element being referenced by this handle, or `null` if the element has
+   * been garbage collected.
+   */
+  WeakReference<Element> _elementReference;
+
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ElementHandle(Element element) {
+    _context = element.context;
+    _location = element.location;
+    _elementReference = new WeakReference<Element>(element);
+  }
+
+  /**
+   * Return the element being represented by this handle, reconstituting the element if the
+   * reference has been set to `null`.
+   *
+   * @return the element being represented by this handle
+   */
+  Element get actualElement {
+    Element element = _elementReference.get();
+    if (element == null) {
+      element = _context.getElement(_location);
+      _elementReference = new WeakReference<Element>(element);
+    }
+    return element;
+  }
+
+  @override
+  AnalysisContext get context => _context;
+
+  @override
+  String get displayName => actualElement.displayName;
+
+  @override
+  Element get enclosingElement => actualElement.enclosingElement;
+
+  @override
+  int get hashCode => _location.hashCode;
+
+  @override
+  bool get isDeprecated => actualElement.isDeprecated;
+
+  @override
+  bool get isOverride => actualElement.isOverride;
+
+  @override
+  bool get isPrivate => actualElement.isPrivate;
+
+  @override
+  bool get isPublic => actualElement.isPublic;
+
+  @override
+  bool get isSynthetic => actualElement.isSynthetic;
+
+  @override
+  LibraryElement get library =>
+      getAncestor((element) => element is LibraryElement);
+
+  @override
+  ElementLocation get location => _location;
+
+  @override
+  List<ElementAnnotation> get metadata => actualElement.metadata;
+
+  @override
+  String get name => actualElement.name;
+
+  @override
+  int get nameOffset => actualElement.nameOffset;
+
+  @deprecated
+  @override
+  AstNode get node => computeNode();
+
+  @override
+  Source get source => actualElement.source;
+
+  @override
+  CompilationUnit get unit => actualElement.unit;
+
+  @override
+  bool operator ==(Object object) =>
+      object is Element && object.location == _location;
+
+  @override
+  accept(ElementVisitor visitor) => actualElement.accept(visitor);
+
+  @override
+  String computeDocumentationComment() =>
+      actualElement.computeDocumentationComment();
+
+  @override
+  AstNode computeNode() => actualElement.computeNode();
+
+  @override
+  Element getAncestor(Predicate<Element> predicate) =>
+      actualElement.getAncestor(predicate);
+
+  @override
+  String getExtendedDisplayName(String shortName) =>
+      actualElement.getExtendedDisplayName(shortName);
+
+  @override
+  bool isAccessibleIn(LibraryElement library) =>
+      actualElement.isAccessibleIn(library);
+
+  @override
+  void visitChildren(ElementVisitor visitor) {
+    actualElement.visitChildren(visitor);
+  }
+
+  /**
+   * Return a handle on the given element. If the element is already a handle, then it will be
+   * returned directly, otherwise a handle of the appropriate class will be constructed.
+   *
+   * @param element the element for which a handle is to be constructed
+   * @return a handle on the given element
+   */
+  static Element forElement(Element element) {
+    if (element is ElementHandle) {
+      return element;
+    }
+    while (true) {
+      if (element.kind == ElementKind.CLASS) {
+        return new ClassElementHandle(element as ClassElement);
+      } else if (element.kind == ElementKind.COMPILATION_UNIT) {
+        return new CompilationUnitElementHandle(
+            element as CompilationUnitElement);
+      } else if (element.kind == ElementKind.CONSTRUCTOR) {
+        return new ConstructorElementHandle(element as ConstructorElement);
+      } else if (element.kind == ElementKind.EXPORT) {
+        return new ExportElementHandle(element as ExportElement);
+      } else if (element.kind == ElementKind.FIELD) {
+        return new FieldElementHandle(element as FieldElement);
+      } else if (element.kind == ElementKind.FUNCTION) {
+        return new FunctionElementHandle(element as FunctionElement);
+      } else if (element.kind == ElementKind.GETTER) {
+        return new PropertyAccessorElementHandle(
+            element as PropertyAccessorElement);
+      } else if (element.kind == ElementKind.IMPORT) {
+        return new ImportElementHandle(element as ImportElement);
+      } else if (element.kind == ElementKind.LABEL) {
+        return new LabelElementHandle(element as LabelElement);
+      } else if (element.kind == ElementKind.LIBRARY) {
+        return new LibraryElementHandle(element as LibraryElement);
+      } else if (element.kind == ElementKind.LOCAL_VARIABLE) {
+        return new LocalVariableElementHandle(element as LocalVariableElement);
+      } else if (element.kind == ElementKind.METHOD) {
+        return new MethodElementHandle(element as MethodElement);
+      } else if (element.kind == ElementKind.PARAMETER) {
+        return new ParameterElementHandle(element as ParameterElement);
+      } else if (element.kind == ElementKind.PREFIX) {
+        return new PrefixElementHandle(element as PrefixElement);
+      } else if (element.kind == ElementKind.SETTER) {
+        return new PropertyAccessorElementHandle(
+            element as PropertyAccessorElement);
+      } else if (element.kind == ElementKind.TOP_LEVEL_VARIABLE) {
+        return new TopLevelVariableElementHandle(
+            element as TopLevelVariableElement);
+      } else if (element.kind == ElementKind.FUNCTION_TYPE_ALIAS) {
+        return new FunctionTypeAliasElementHandle(
+            element as FunctionTypeAliasElement);
+      } else if (element.kind == ElementKind.TYPE_PARAMETER) {
+        return new TypeParameterElementHandle(element as TypeParameterElement);
+      } else {
+        throw new UnsupportedOperationException();
+      }
+      break;
+    }
+  }
+
+  /**
+   * Return an array of the same size as the given array where each element of the returned array is
+   * a handle for the corresponding element of the given array.
+   *
+   * @param elements the elements for which handles are to be created
+   * @return an array of handles to the given elements
+   */
+  static List<Element> forElements(List<Element> elements) {
+    int length = elements.length;
+    List<Element> handles = new List<Element>.from(elements);
+    for (int i = 0; i < length; i++) {
+      handles[i] = forElement(elements[i]);
+    }
+    return handles;
+  }
+}
+
+/**
+ * The abstract class `ExecutableElementHandle` implements the behavior common to objects that
+ * implement a handle to an [ExecutableElement].
+ */
+abstract class ExecutableElementHandle extends ElementHandle
+    implements ExecutableElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ExecutableElementHandle(ExecutableElement element) : super(element);
+
+  @override
+  ExecutableElement get actualElement =>
+      super.actualElement as ExecutableElement;
+
+  @override
+  List<FunctionElement> get functions => actualElement.functions;
+
+  @override
+  bool get hasImplicitReturnType => actualElement.hasImplicitReturnType;
+
+  @override
+  bool get isAbstract => actualElement.isAbstract;
+
+  @override
+  bool get isAsynchronous => actualElement.isAsynchronous;
+
+  @override
+  bool get isExternal => actualElement.isExternal;
+
+  @override
+  bool get isGenerator => actualElement.isGenerator;
+
+  @override
+  bool get isOperator => actualElement.isOperator;
+
+  @override
+  bool get isStatic => actualElement.isStatic;
+
+  @override
+  bool get isSynchronous => actualElement.isSynchronous;
+
+  @override
+  List<LabelElement> get labels => actualElement.labels;
+
+  @override
+  List<LocalVariableElement> get localVariables => actualElement.localVariables;
+
+  @override
+  List<ParameterElement> get parameters => actualElement.parameters;
+
+  @override
+  DartType get returnType => actualElement.returnType;
+
+  @override
+  FunctionType get type => actualElement.type;
+
+  @override
+  List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
+}
+
+/**
+ * Instances of the class `ExportElementHandle` implement a handle to an `ExportElement`
+ * .
+ */
+class ExportElementHandle extends ElementHandle implements ExportElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ExportElementHandle(ExportElement element) : super(element);
+
+  @override
+  ExportElement get actualElement => super.actualElement as ExportElement;
+
+  @override
+  List<NamespaceCombinator> get combinators => actualElement.combinators;
+
+  @override
+  LibraryElement get exportedLibrary => actualElement.exportedLibrary;
+
+  @override
+  ElementKind get kind => ElementKind.EXPORT;
+
+  @override
+  String get uri => actualElement.uri;
+
+  @override
+  int get uriEnd => actualElement.uriEnd;
+
+  @override
+  int get uriOffset => actualElement.uriOffset;
+}
+
+/**
+ * Instances of the class `FieldElementHandle` implement a handle to a `FieldElement`.
+ */
+class FieldElementHandle extends PropertyInducingElementHandle
+    implements FieldElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  FieldElementHandle(FieldElement element) : super(element);
+
+  @override
+  FieldElement get actualElement => super.actualElement as FieldElement;
+
+  @override
+  ClassElement get enclosingElement => actualElement.enclosingElement;
+
+  @override
+  bool get isEnumConstant => actualElement.isEnumConstant;
+
+  @override
+  ElementKind get kind => ElementKind.FIELD;
+
+  @override
+  VariableDeclaration computeNode() => actualElement.computeNode();
+}
+
+/**
+ * Instances of the class `FunctionElementHandle` implement a handle to a
+ * `FunctionElement`.
+ */
+class FunctionElementHandle extends ExecutableElementHandle
+    implements FunctionElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  FunctionElementHandle(FunctionElement element) : super(element);
+
+  @override
+  FunctionElement get actualElement => super.actualElement as FunctionElement;
+
+  @override
+  bool get isEntryPoint => actualElement.isEntryPoint;
+
+  @override
+  ElementKind get kind => ElementKind.FUNCTION;
+
+  @override
+  SourceRange get visibleRange => actualElement.visibleRange;
+
+  @override
+  FunctionDeclaration computeNode() => actualElement.computeNode();
+}
+
+/**
+ * Instances of the class `FunctionTypeAliasElementHandle` implement a handle to a
+ * `FunctionTypeAliasElement`.
+ */
+class FunctionTypeAliasElementHandle extends ElementHandle
+    implements FunctionTypeAliasElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  FunctionTypeAliasElementHandle(FunctionTypeAliasElement element)
+      : super(element);
+
+  @override
+  FunctionTypeAliasElement get actualElement =>
+      super.actualElement as FunctionTypeAliasElement;
+
+  @override
+  CompilationUnitElement get enclosingElement =>
+      super.enclosingElement as CompilationUnitElement;
+
+  @override
+  ElementKind get kind => ElementKind.FUNCTION_TYPE_ALIAS;
+
+  @override
+  List<ParameterElement> get parameters => actualElement.parameters;
+
+  @override
+  DartType get returnType => actualElement.returnType;
+
+  @override
+  FunctionType get type => actualElement.type;
+
+  @override
+  List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
+
+  @override
+  FunctionTypeAlias computeNode() => actualElement.computeNode();
+}
+
+/**
+ * Instances of the class `ImportElementHandle` implement a handle to an `ImportElement`
+ * .
+ */
+class ImportElementHandle extends ElementHandle implements ImportElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ImportElementHandle(ImportElement element) : super(element);
+
+  @override
+  ImportElement get actualElement => super.actualElement as ImportElement;
+
+  @override
+  List<NamespaceCombinator> get combinators => actualElement.combinators;
+
+  @override
+  LibraryElement get importedLibrary => actualElement.importedLibrary;
+
+  @override
+  bool get isDeferred => actualElement.isDeferred;
+
+  @override
+  ElementKind get kind => ElementKind.IMPORT;
+
+  @override
+  PrefixElement get prefix => actualElement.prefix;
+
+  @override
+  int get prefixOffset => actualElement.prefixOffset;
+
+  @override
+  String get uri => actualElement.uri;
+
+  @override
+  int get uriEnd => actualElement.uriEnd;
+
+  @override
+  int get uriOffset => actualElement.uriOffset;
+}
+
+/**
+ * Instances of the class `LabelElementHandle` implement a handle to a `LabelElement`.
+ */
+class LabelElementHandle extends ElementHandle implements LabelElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  LabelElementHandle(LabelElement element) : super(element);
+
+  @override
+  ExecutableElement get enclosingElement =>
+      super.enclosingElement as ExecutableElement;
+
+  @override
+  ElementKind get kind => ElementKind.LABEL;
+}
+
+/**
+ * Instances of the class `LibraryElementHandle` implement a handle to a
+ * `LibraryElement`.
+ */
+class LibraryElementHandle extends ElementHandle implements LibraryElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  LibraryElementHandle(LibraryElement element) : super(element);
+
+  @override
+  LibraryElement get actualElement => super.actualElement as LibraryElement;
+
+  @override
+  CompilationUnitElement get definingCompilationUnit =>
+      actualElement.definingCompilationUnit;
+
+  @override
+  FunctionElement get entryPoint => actualElement.entryPoint;
+
+  @override
+  List<LibraryElement> get exportedLibraries => actualElement.exportedLibraries;
+
+  @override
+  Namespace get exportNamespace => actualElement.exportNamespace;
+
+  @override
+  List<ExportElement> get exports => actualElement.exports;
+
+  @override
+  bool get hasExtUri => actualElement.hasExtUri;
+
+  @override
+  bool get hasLoadLibraryFunction => actualElement.hasLoadLibraryFunction;
+
+  @override
+  List<LibraryElement> get importedLibraries => actualElement.importedLibraries;
+
+  @override
+  List<ImportElement> get imports => actualElement.imports;
+
+  @override
+  bool get isBrowserApplication => actualElement.isBrowserApplication;
+
+  @override
+  bool get isDartCore => actualElement.isDartCore;
+
+  @override
+  bool get isInSdk => actualElement.isInSdk;
+
+  @override
+  ElementKind get kind => ElementKind.LIBRARY;
+
+  @override
+  FunctionElement get loadLibraryFunction => actualElement.loadLibraryFunction;
+
+  @override
+  List<CompilationUnitElement> get parts => actualElement.parts;
+
+  @override
+  List<PrefixElement> get prefixes => actualElement.prefixes;
+
+  @override
+  Namespace get publicNamespace => actualElement.publicNamespace;
+
+  @override
+  List<CompilationUnitElement> get units => actualElement.units;
+
+  @override
+  List<LibraryElement> get visibleLibraries => actualElement.visibleLibraries;
+
+  @override
+  List<ImportElement> getImportsWithPrefix(PrefixElement prefixElement) =>
+      actualElement.getImportsWithPrefix(prefixElement);
+
+  @override
+  ClassElement getType(String className) => actualElement.getType(className);
+
+  @override
+  bool isUpToDate(int timeStamp) => actualElement.isUpToDate(timeStamp);
+}
+
+/**
+ * Instances of the class `LocalVariableElementHandle` implement a handle to a
+ * `LocalVariableElement`.
+ */
+class LocalVariableElementHandle extends VariableElementHandle
+    implements LocalVariableElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  LocalVariableElementHandle(LocalVariableElement element) : super(element);
+
+  @override
+  LocalVariableElement get actualElement =>
+      super.actualElement as LocalVariableElement;
+
+  @override
+  ElementKind get kind => ElementKind.LOCAL_VARIABLE;
+
+  @override
+  SourceRange get visibleRange => actualElement.visibleRange;
+
+  @override
+  VariableDeclaration computeNode() => actualElement.computeNode();
+}
+
+/**
+ * Instances of the class `MethodElementHandle` implement a handle to a `MethodElement`.
+ */
+class MethodElementHandle extends ExecutableElementHandle
+    implements MethodElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  MethodElementHandle(MethodElement element) : super(element);
+
+  @override
+  MethodElement get actualElement => super.actualElement as MethodElement;
+
+  @override
+  ClassElement get enclosingElement => super.enclosingElement as ClassElement;
+
+  @override
+  bool get isStatic => actualElement.isStatic;
+
+  @override
+  ElementKind get kind => ElementKind.METHOD;
+
+  @override
+  MethodDeclaration computeNode() => actualElement.computeNode();
+}
+
+/**
+ * Instances of the class `ParameterElementHandle` implement a handle to a
+ * `ParameterElement`.
+ */
+class ParameterElementHandle extends VariableElementHandle
+    with ParameterElementMixin
+    implements ParameterElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  ParameterElementHandle(ParameterElement element) : super(element);
+
+  @override
+  ParameterElement get actualElement => super.actualElement as ParameterElement;
+
+  @override
+  String get defaultValueCode => actualElement.defaultValueCode;
+
+  @override
+  bool get isInitializingFormal => actualElement.isInitializingFormal;
+
+  @override
+  ElementKind get kind => ElementKind.PARAMETER;
+
+  @override
+  ParameterKind get parameterKind => actualElement.parameterKind;
+
+  @override
+  List<ParameterElement> get parameters => actualElement.parameters;
+
+  @override
+  List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
+
+  @override
+  SourceRange get visibleRange => actualElement.visibleRange;
+}
+
+/**
+ * Instances of the class `PrefixElementHandle` implement a handle to a `PrefixElement`.
+ */
+class PrefixElementHandle extends ElementHandle implements PrefixElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  PrefixElementHandle(PrefixElement element) : super(element);
+
+  @override
+  PrefixElement get actualElement => super.actualElement as PrefixElement;
+
+  @override
+  LibraryElement get enclosingElement =>
+      super.enclosingElement as LibraryElement;
+
+  @override
+  List<LibraryElement> get importedLibraries => actualElement.importedLibraries;
+
+  @override
+  ElementKind get kind => ElementKind.PREFIX;
+}
+
+/**
+ * Instances of the class `PropertyAccessorElementHandle` implement a handle to a
+ * `PropertyAccessorElement`.
+ */
+class PropertyAccessorElementHandle extends ExecutableElementHandle
+    implements PropertyAccessorElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  PropertyAccessorElementHandle(PropertyAccessorElement element)
+      : super(element);
+
+  @override
+  PropertyAccessorElement get actualElement =>
+      super.actualElement as PropertyAccessorElement;
+
+  @override
+  PropertyAccessorElement get correspondingGetter =>
+      actualElement.correspondingGetter;
+
+  @override
+  PropertyAccessorElement get correspondingSetter =>
+      actualElement.correspondingSetter;
+
+  @override
+  bool get isGetter => actualElement.isGetter;
+
+  @override
+  bool get isSetter => actualElement.isSetter;
+
+  @override
+  ElementKind get kind {
+    if (isGetter) {
+      return ElementKind.GETTER;
+    } else {
+      return ElementKind.SETTER;
+    }
+  }
+
+  @override
+  PropertyInducingElement get variable => actualElement.variable;
+}
+
+/**
+ * The abstract class `PropertyInducingElementHandle` implements the behavior common to
+ * objects that implement a handle to an `PropertyInducingElement`.
+ */
+abstract class PropertyInducingElementHandle extends VariableElementHandle
+    implements PropertyInducingElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  PropertyInducingElementHandle(PropertyInducingElement element)
+      : super(element);
+
+  @override
+  PropertyInducingElement get actualElement =>
+      super.actualElement as PropertyInducingElement;
+
+  @override
+  PropertyAccessorElement get getter => actualElement.getter;
+
+  @override
+  DartType get propagatedType => actualElement.propagatedType;
+
+  @override
+  PropertyAccessorElement get setter => actualElement.setter;
+}
+
+/**
+ * Instances of the class `TopLevelVariableElementHandle` implement a handle to a
+ * `TopLevelVariableElement`.
+ */
+class TopLevelVariableElementHandle extends PropertyInducingElementHandle
+    implements TopLevelVariableElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  TopLevelVariableElementHandle(TopLevelVariableElement element)
+      : super(element);
+
+  @override
+  ElementKind get kind => ElementKind.TOP_LEVEL_VARIABLE;
+}
+
+/**
+ * Instances of the class `TypeParameterElementHandle` implement a handle to a
+ * [TypeParameterElement].
+ */
+class TypeParameterElementHandle extends ElementHandle
+    implements TypeParameterElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  TypeParameterElementHandle(TypeParameterElement element) : super(element);
+
+  @override
+  TypeParameterElement get actualElement =>
+      super.actualElement as TypeParameterElement;
+
+  @override
+  DartType get bound => actualElement.bound;
+
+  @override
+  ElementKind get kind => ElementKind.TYPE_PARAMETER;
+
+  @override
+  TypeParameterType get type => actualElement.type;
+}
+
+/**
+ * The abstract class `VariableElementHandle` implements the behavior common to objects that
+ * implement a handle to an `VariableElement`.
+ */
+abstract class VariableElementHandle extends ElementHandle
+    implements VariableElement {
+  /**
+   * Initialize a newly created element handle to represent the given element.
+   *
+   * @param element the element being represented
+   */
+  VariableElementHandle(VariableElement element) : super(element);
+
+  @override
+  VariableElement get actualElement => super.actualElement as VariableElement;
+
+  @override
+  bool get hasImplicitType => actualElement.hasImplicitType;
+
+  @override
+  FunctionElement get initializer => actualElement.initializer;
+
+  @override
+  bool get isConst => actualElement.isConst;
+
+  @override
+  bool get isFinal => actualElement.isFinal;
+
+  @override
+  bool get isPotentiallyMutatedInClosure =>
+      actualElement.isPotentiallyMutatedInClosure;
+
+  @override
+  bool get isPotentiallyMutatedInScope =>
+      actualElement.isPotentiallyMutatedInScope;
+
+  @override
+  bool get isStatic => actualElement.isStatic;
+
+  @override
+  DartType get type => actualElement.type;
+}
+
+/**
+ * TODO(scheglov) invalid implementation
+ */
+class WeakReference<T> {
+  final T value;
+  WeakReference(this.value);
+  T get() => value;
+}