Handle null content in ContentChange.

pkg/analysis_server/lib/src/protocol.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 protocol;
 
 import 'dart:collection';
 import 'dart:convert' show JsonDecoder;
 
 /**
@@ skipping 383 matching lines @@
    * Validate that the datum is a map from strings to string listss, and return
    * it.
    */
   Map<String, List<String>> asStringListMap() {
     if (!isStringListMap()) {
       throw new RequestFailure(new Response.invalidParameter(request, path,
           "be a string list map"));
     }
     return datum;
   }
+
+  bool get isNull => datum == null;

[scheglov, 2014/06/13 16:55:53]

Should we add a documentation for it?

[Paul Berry, 2014/06/13 20:23:00]

I couldn't think of a documentation comment that wasn't so obvious that it
looked silly, e.g.:

/**
 * True if the datum is null.
 */
bool get isNull => datum == null;

I'm open to suggestions.

 }
 
 /**
  * Instances of the class [Response] represent a response to a request.
  */
 class Response {
   /**
    * The name of the JSON attribute containing the id of the request for which
    * this is a response.
    */
@@ skipping 428 matching lines @@
   /**
    * The response to be returned as a result of the failure.
    */
   final Response response;
 
   /**
    * Initialize a newly created exception to return the given reponse.
    */
   RequestFailure(this.response);
 }