Validation of `@protected` method invocations.

pkg/analyzer/lib/src/dart/element/element.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 analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1544 matching lines @@
    */
   static String _DEPRECATED_CLASS_NAME = "Deprecated";
 
   /**
    * The name of the top-level variable used to mark an element as being
    * deprecated.
    */
   static String _DEPRECATED_VARIABLE_NAME = "deprecated";
 
   /**
+   * The name of `meta` library, used to define analysis annotations.
+   */
+  static String _META_LIB_NAME = "meta";
+
+  /**
    * The name of the top-level variable used to mark a method as being expected
    * to override an inherited method.
    */
   static String _OVERRIDE_VARIABLE_NAME = "override";
 
   /**
+   * The name of the top-level variable used to mark a method as being
+   * protected.
+   */
+  static String _PROTECTED_VARIABLE_NAME = "protected";
+
+  /**
    * The name of the top-level variable used to mark a class as implementing a
    * proxy object.
    */
   static String PROXY_VARIABLE_NAME = "proxy";
 
   /**
    * The element representing the field, variable, or constructor being used as
    * an annotation.
    */
   Element element;
@@ skipping 56 matching lines @@
         if (element is PropertyAccessorElement &&
             element.name == _OVERRIDE_VARIABLE_NAME) {
           return true;
         }
       }
     }
     return false;
   }
 
   @override
+  bool get isProtected {
+    if (element != null) {
+      LibraryElement library = element.library;
+      if (library != null && library.name == _META_LIB_NAME) {
+        if (element is PropertyAccessorElement &&
+            element.name == _PROTECTED_VARIABLE_NAME) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  @override
   bool get isProxy {
     if (element != null) {
       LibraryElement library = element.library;
       if (library != null && library.isDartCore) {
         if (element is PropertyAccessorElement &&
             element.name == PROXY_VARIABLE_NAME) {
           return true;
         }
       }
     }
@@ skipping 173 matching lines @@
   @override
   bool get isPrivate {
     String name = displayName;
     if (name == null) {
       return true;
     }
     return Identifier.isPrivateName(name);
   }
 
   @override
+  bool get isProtected {
+    for (ElementAnnotation annotation in metadata) {
+      if (annotation.isProtected) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @override
   bool get isPublic => !isPrivate;
 
   @override
   bool get isSynthetic => hasModifier(Modifier.SYNTHETIC);
 
   @override
   LibraryElement get library =>
       getAncestor((element) => element is LibraryElement);
 
   @override
@@ skipping 2072 matching lines @@
   @override
   bool get isPrivate {
     String name = displayName;
     if (name == null) {
       return false;
     }
     return Identifier.isPrivateName(name);
   }
 
   @override
+  bool get isProtected => false;
+
+  @override
   bool get isPublic => !isPrivate;
 
   @override
   bool get isSynthetic => true;
 
   @override
   ElementKind get kind => ElementKind.ERROR;
 
   @override
   LibraryElement get library => null;
@@ skipping 862 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }