changes for 0.3.9

lib/src/protobuf/mixins/map_mixin.dart

+// Copyright (c) 2015, 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 protobuf.mixins.map;
+
+import "package:protobuf/protobuf.dart" show BuilderInfo;
+
+/// A PbMapMixin provides an experimental implementation of the
+/// Map interface for a GeneratedMessage.
+///
+/// This mixin is enabled via an option in
+/// dart_options.proto in dart-protoc-plugin.
+abstract class PbMapMixin implements Map<String, dynamic> {
+
+  // GeneratedMessage properties and methods used by this mixin.
+
+  BuilderInfo info_;
+  void clear();
+  int getTagNumber(String fieldName);
+  getField(int tagNumber);
+  void setField(int tagNumber, var value, [int fieldType = null]);
+
+  @override
+  operator [](key) {
+    if (key is! String) return null;
+    var tag = getTagNumber(key);
+    if (tag == null) return null;
+    return getField(tag);
+  }
+
+  @override
+  operator []=(String key, val) {
+    var tag = getTagNumber(key);
+    if (tag == null) {
+      throw new ArgumentError(
+          "field '${key}' not found in ${info_.messageName}");
+    }
+    setField(tag, val);
+  }
+
+  @override
+  get keys => info_.byName.keys;
+
+  @override
+  bool containsKey(Object key) => info_.byName.containsKey(key);
+
+  @override
+  get length => info_.byName.length;
+
+  @override
+  remove(key) {
+    throw new UnsupportedError(
+        "remove() not supported by ${info_.messageName}");
+  }
+}