Support refresh of individual analysis roots (issue 22254)

pkg/analysis_server/lib/src/domain_analysis.dart

Index: pkg/analysis_server/lib/src/domain_analysis.dart
diff --git a/pkg/analysis_server/lib/src/domain_analysis.dart b/pkg/analysis_server/lib/src/domain_analysis.dart
index 5b461079773318456229eaf979e910950662b165..76e3ed9b2dc75579f96249260543488bb99c849a 100644
--- a/pkg/analysis_server/lib/src/domain_analysis.dart
+++ b/pkg/analysis_server/lib/src/domain_analysis.dart
@@ -13,6 +13,7 @@ import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/dependencies/library_dependencies.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/engine.dart' as engine;
+import 'package:analyzer/file_system/file_system.dart';
 
 /**
  * Instances of the class [AnalysisDomainHandler] implement a [RequestHandler]
@@ -136,7 +137,22 @@ class AnalysisDomainHandler implements RequestHandler {
    * Implement the 'analysis.reanalyze' request.
    */
   Response reanalyze(Request request) {
-    server.reanalyze();
+    AnalysisReanalyzeParams params = new AnalysisReanalyzeParams.fromRequest(request);
+    List<String> roots = params.roots;
+    if (roots == null || roots.isNotEmpty) {
+      List<String> includedPaths = server.contextDirectoryManager.includedPaths;
+      List<Resource> rootResources = null;
+      if (roots != null) {
+        rootResources = <Resource>[];
+        for (String rootPath in roots) {
+          if (!includedPaths.contains(rootPath)) {
+            return new Response.invalidAnalysisRoot(request, rootPath);
+          }
+          rootResources.add(server.resourceProvider.getResource(rootPath));
+        }
+      }
+      server.reanalyze(rootResources);
+    }
     return new AnalysisReanalyzeResult().toResponse(request.id);
   }