Adjust server for API changes

pkg/analysis_server/lib/src/domain_completion.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 domain.completion;
+
+import 'package:analysis_server/src/analysis_server.dart';
+import 'package:analysis_server/src/constants.dart';
+import 'package:analysis_server/src/protocol.dart';
+
+/**
+ * Instances of the class [CompletionDomainHandler] implement a [RequestHandler]
+ * that handles requests in the search domain.
+ */
+class CompletionDomainHandler implements RequestHandler {
+  /**
+   * The analysis server that is using this handler to process requests.
+   */
+  final AnalysisServer server;
+
+  /**
+   * Initialize a newly created handler to handle requests for the given [server].
+   */
+  CompletionDomainHandler(this.server);
+
+  @override
+  Response handleRequest(Request request) {
+    try {
+      String requestName = request.method;
+      if (requestName == COMPLETION_GET_SUGGESTIONS) {
+        return getSuggestions(request);
+      }
+    } on RequestFailure catch (exception) {
+      return exception.response;
+    }
+    return null;
+  }
+
+  Response getSuggestions(Request request) {
+    // file
+    RequestDatum fileDatum = request.getRequiredParameter(FILE);
+    String file = fileDatum.asString();
+    // offset
+    RequestDatum offsetDatum = request.getRequiredParameter(OFFSET);
+    int offset = offsetDatum.asInt();
+    // TODO(brianwilkerson) implement
+    return null;
+  }
+}