Use typed RefactoringOptions in the Dart version of the protocol.

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';
 
 import 'package:analysis_server/src/computer/element.dart' show
@@ skipping 378 matching lines @@
  * Create an OverriddenMember based on an element from the analyzer engine.
  */
 OverriddenMember _overriddenMemberFromEngine(engine.Element member) {
   Element element = elementFromEngine(member);
   String className = member.enclosingElement.displayName;
   return new OverriddenMember(element, className);
 }
 
 
 /**
+ * Create a [RefactoringOptions] corresponding the given [kind].
+ */
+RefactoringOptions _refactoringOptionsFromJson(JsonDecoder jsonDecoder,
+    String jsonPath, Object json, RefactoringKind kind) {
+  if (kind == RefactoringKind.EXTRACT_LOCAL_VARIABLE) {
+    return new ExtractLocalVariableOptions.fromJson(jsonDecoder, jsonPath, json);
+  }
+  if (kind == RefactoringKind.EXTRACT_METHOD) {
+    return new ExtractMethodOptions.fromJson(jsonDecoder, jsonPath, json);
+  }
+  if (kind == RefactoringKind.INLINE_METHOD) {
+    return new InlineMethodOptions.fromJson(jsonDecoder, jsonPath, json);
+  }
+  if (kind == RefactoringKind.RENAME) {
+    return new RenameOptions.fromJson(jsonDecoder, jsonPath, json);
+  }
+  return null;
+}
+
+
+/**
  * Create a SearchResultKind based on a value from the search engine.
  */
 SearchResultKind _searchResultKindFromEngine(engine.MatchKind kind) {
   if (kind == engine.MatchKind.DECLARATION) {
     return SearchResultKind.DECLARATION;
   }
   if (kind == engine.MatchKind.READ) {
     return SearchResultKind.READ;
   }
   if (kind == engine.MatchKind.READ_WRITE) {
@@ skipping 538 matching lines @@
     hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
     hash = hash ^ (hash >> 11);
     return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
   }
 
   static int hash2(a, b) => finish(combine(combine(0, a), b));
 
   static int hash4(a, b, c, d) =>
       finish(combine(combine(combine(combine(0, a), b), c), d));
 }