Introduce FolderDisposition class hierarchy for use in ContextManagerCallback.

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core' hide Resource;
 import 'dart:math' show max;
 
 import 'package:analysis_server/plugin/analyzed_files.dart';
 import 'package:analysis_server/src/analysis_logger.dart';
 import 'package:analysis_server/src/channel/channel.dart';
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/operation/operation_analysis.dart';
 import 'package:analysis_server/src/operation/operation_queue.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/namespace.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analysis_server/src/source/optimizing_pub_package_map_provider.dart';
 import 'package:analysis_server/uri/resolver_provider.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
-import 'package:analyzer/source/package_map_resolver.dart';
-import 'package:analyzer/source/sdk_ext.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:package_config/packages.dart';
 import 'package:plugin/plugin.dart';
@@ skipping 1308 matching lines @@
   final AnalysisServer analysisServer;
 
   /**
    * The [ResourceProvider] by which paths are converted into [Resource]s.
    */
   final ResourceProvider resourceProvider;
 
   ServerContextManagerCallbacks(this.analysisServer, this.resourceProvider);
 
   @override
-  AnalysisContext addContext(
-      Folder folder, UriResolver packageUriResolver, Packages packages) {
+  AnalysisContext addContext(Folder folder, FolderDisposition disposition) {
     InternalAnalysisContext context =
         AnalysisEngine.instance.createAnalysisContext();
     context.contentCache = analysisServer.overlayState;
     analysisServer.folderMap[folder] = context;
-    context.sourceFactory = _createSourceFactory(packageUriResolver, packages);
+    context.sourceFactory = _createSourceFactory(disposition);
     context.analysisOptions =
         new AnalysisOptionsImpl.from(analysisServer.defaultContextOptions);
     analysisServer._onContextsChangedController
         .add(new ContextsChangedEvent(added: [context]));
     analysisServer.schedulePerformAnalysisOperation(context);
     return context;
   }
 
   @override
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet) {
@@ skipping 48 matching lines @@
         // links causing the analyzer to thrash, just ignore links to
         // non-existent files.
         return file.exists;
       }
     }
     return false;
   }
 
   @override
   void updateContextPackageUriResolver(
-      Folder contextFolder, UriResolver packageUriResolver, Packages packages) {
+      Folder contextFolder, FolderDisposition disposition) {
     AnalysisContext context = analysisServer.folderMap[contextFolder];
-    context.sourceFactory = _createSourceFactory(packageUriResolver, packages);
+    context.sourceFactory = _createSourceFactory(disposition);
     analysisServer._onContextsChangedController
         .add(new ContextsChangedEvent(changed: [context]));
     analysisServer.schedulePerformAnalysisOperation(context);
   }
 
   void _computingPackageMap(bool computing) {
     if (analysisServer.serverServices.contains(ServerService.STATUS)) {
       PubStatus pubStatus = new PubStatus(computing);
       ServerStatusParams params = new ServerStatusParams(pub: pubStatus);
       analysisServer.sendNotification(params.toNotification());
     }
   }
 
   /**
-   * Set up a [SourceFactory] that resolves packages using the given
-   * [packageUriResolver] and [packages] resolution strategy.
+   * Set up a [SourceFactory] that resolves packages as appropriate for the
+   * given [disposition].
    */
-  SourceFactory _createSourceFactory(
-      UriResolver packageUriResolver, Packages packages) {
+  SourceFactory _createSourceFactory(FolderDisposition disposition) {
     UriResolver dartResolver = new DartUriResolver(analysisServer.defaultSdk);
     UriResolver resourceResolver = new ResourceUriResolver(resourceProvider);
     List<UriResolver> resolvers = [];
     resolvers.add(dartResolver);
-    if (packageUriResolver is PackageMapUriResolver) {
-      UriResolver sdkExtResolver =
-          new SdkExtUriResolver(packageUriResolver.packageMap);
-      resolvers.add(sdkExtResolver);
-    }
-    if (packageUriResolver != null) {
-      resolvers.add(packageUriResolver);
-    }
+    resolvers.addAll(disposition.createPackageUriResolvers(resourceProvider));
     resolvers.add(resourceResolver);
-    return new SourceFactory(resolvers, packages);
+    return new SourceFactory(resolvers, disposition.packages);
   }
 }
 
 /**
  * A class used by [AnalysisServer] to record performance information
  * such as request latency.
  */
 class ServerPerformance {
 
   /**
@@ skipping 85 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = new PerformanceTag('serverRequests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }