Update to use the latest version of the plugin package

pkg/analyzer/lib/src/plugin/engine_plugin.dart

 // Copyright (c) 2015, 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.plugin.engine_plugin;
 
 import 'package:analyzer/plugin/task.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show InternalAnalysisContext;
 import 'package:analyzer/src/generated/error.dart' show AnalysisError;
@@ skipping 48 matching lines @@
 
   /**
    * The unique identifier of this plugin.
    */
   static const String UNIQUE_IDENTIFIER = 'analysis_engine.core';
 
   /**
    * The extension point that allows plugins to register new analysis error
    * results for a Dart source.
    */
-  ExtensionPoint dartErrorsForSourceExtensionPoint;
+  ExtensionPoint<ListResultDescriptor<AnalysisError>>
+      dartErrorsForSourceExtensionPoint;
 
   /**
    * The extension point that allows plugins to register new analysis error
    * results for a Dart library specific unit.
    */
-  ExtensionPoint dartErrorsForUnitExtensionPoint;
+  ExtensionPoint<ListResultDescriptor<AnalysisError>>
+      dartErrorsForUnitExtensionPoint;
 
   /**
    * The extension point that allows plugins to register new analysis error
    * results for an HTML source.
    */
-  ExtensionPoint htmlErrorsExtensionPoint;
+  ExtensionPoint<ListResultDescriptor<AnalysisError>> htmlErrorsExtensionPoint;
 
   /**
    * The extension point that allows plugins to register new analysis tasks with
    * the analysis engine.
    */
-  ExtensionPoint taskExtensionPoint;
+  ExtensionPoint<TaskDescriptor> taskExtensionPoint;
 
   /**
    * The extension point that allows plugins to register new work manager
    * factories with the analysis engine.
    */
-  ExtensionPoint workManagerFactoryExtensionPoint;
+  ExtensionPoint<WorkManagerFactory> workManagerFactoryExtensionPoint;
 
   /**
    * Initialize a newly created plugin.
    */
   EnginePlugin();
 
   /**
    * Return a list containing all of the contributed analysis error result
    * descriptors for Dart sources.
    */
@@ skipping 26 matching lines @@
 
   /**
    * Return a list containing all of the work manager factories that were
    * contributed.
    */
   List<WorkManagerFactory> get workManagerFactories =>
       workManagerFactoryExtensionPoint.extensions;
 
   @override
   void registerExtensionPoints(RegisterExtensionPoint registerExtensionPoint) {
-    dartErrorsForSourceExtensionPoint = registerExtensionPoint(
-        DART_ERRORS_FOR_SOURCE_EXTENSION_POINT,
-        _validateAnalysisErrorListResultDescriptor);
-    dartErrorsForUnitExtensionPoint = registerExtensionPoint(
-        DART_ERRORS_FOR_UNIT_EXTENSION_POINT,
-        _validateAnalysisErrorListResultDescriptor);
-    htmlErrorsExtensionPoint = registerExtensionPoint(
-        HTML_ERRORS_EXTENSION_POINT,
-        _validateAnalysisErrorListResultDescriptor);
+    dartErrorsForSourceExtensionPoint =
+        new ExtensionPoint<ListResultDescriptor<AnalysisError>>(
+            this, DART_ERRORS_FOR_SOURCE_EXTENSION_POINT, null);
+    registerExtensionPoint(dartErrorsForSourceExtensionPoint);
+    dartErrorsForUnitExtensionPoint =
+        new ExtensionPoint<ListResultDescriptor<AnalysisError>>(
+            this, DART_ERRORS_FOR_UNIT_EXTENSION_POINT, null);
+    registerExtensionPoint(dartErrorsForUnitExtensionPoint);
+    htmlErrorsExtensionPoint =
+        new ExtensionPoint<ListResultDescriptor<AnalysisError>>(
+            this, HTML_ERRORS_EXTENSION_POINT, null);
+    registerExtensionPoint(htmlErrorsExtensionPoint);
     taskExtensionPoint =
-        registerExtensionPoint(TASK_EXTENSION_POINT, _validateTaskExtension);
-    workManagerFactoryExtensionPoint = registerExtensionPoint(
-        WORK_MANAGER_FACTORY_EXTENSION_POINT,
-        _validateWorkManagerFactoryExtension);
+        new ExtensionPoint<TaskDescriptor>(this, TASK_EXTENSION_POINT, null);
+    registerExtensionPoint(taskExtensionPoint);
+    workManagerFactoryExtensionPoint = new ExtensionPoint<WorkManagerFactory>(
+        this, WORK_MANAGER_FACTORY_EXTENSION_POINT, null);
+    registerExtensionPoint(workManagerFactoryExtensionPoint);
   }
 
   @override
   void registerExtensions(RegisterExtension registerExtension) {
     _registerTaskExtensions(registerExtension);
     _registerWorkManagerFactoryExtensions(registerExtension);
     _registerDartErrorsForSource(registerExtension);
     _registerDartErrorsForUnit(registerExtension);
     _registerHtmlErrors(registerExtension);
   }
@@ skipping 88 matching lines @@
   void _registerWorkManagerFactoryExtensions(
       RegisterExtension registerExtension) {
     String taskId = WORK_MANAGER_EXTENSION_POINT_ID;
     registerExtension(taskId,
         (InternalAnalysisContext context) => new DartWorkManager(context));
     registerExtension(taskId,
         (InternalAnalysisContext context) => new HtmlWorkManager(context));
     registerExtension(taskId,
         (InternalAnalysisContext context) => new OptionsWorkManager(context));
   }
-
-  /**
-   * Validate the given extension by throwing an [ExtensionError] if it is not
-   * a [ListResultDescriptor] of [AnalysisError]s.
-   */
-  void _validateAnalysisErrorListResultDescriptor(Object extension) {
-    if (extension is! ListResultDescriptor<AnalysisError>) {
-      String id = taskExtensionPoint.uniqueIdentifier;
-      throw new ExtensionError(
-          'Extensions to $id must be a ListResultDescriptor<AnalysisError>');
-    }
-  }
-
-  /**
-   * Validate the given extension by throwing an [ExtensionError] if it is not
-   * a [TaskDescriptor].
-   */
-  void _validateTaskExtension(Object extension) {
-    if (extension is! TaskDescriptor) {
-      String id = taskExtensionPoint.uniqueIdentifier;
-      throw new ExtensionError('Extensions to $id must be a TaskDescriptor');
-    }
-  }
-
-  /**
-   * Validate the given extension by throwing an [ExtensionError] if it is not
-   * a [WorkManagerFactory].
-   */
-  void _validateWorkManagerFactoryExtension(Object extension) {
-    if (extension is! WorkManagerFactory) {
-      String id = taskExtensionPoint.uniqueIdentifier;
-      throw new ExtensionError(
-          'Extensions to $id must be a WorkManagerFactory');
-    }
-  }
 }
 
 /**
  * Annotation describing the relationship between a getter in [EnginePlugin]
  * and the associated identifier (in '../../plugin/task.dart') which can be
  * passed to the extension manager to populate it.
  *
  * This annotation is not used at runtime; it is used to aid in static analysis
  * of the task model during development.
  */
 class ExtensionPointId {
   final String extensionPointId;
 
   const ExtensionPointId(this.extensionPointId);
 }