Implementation of 'Server Domain' in dart analysis server.

pkg/analysis_server/lib/src/protocol.dart

Index: pkg/analysis_server/lib/src/protocol.dart
diff --git a/pkg/analysis_server/lib/src/protocol.dart b/pkg/analysis_server/lib/src/protocol.dart
index 75b29c7a60be4825563fd3b48fe0d764e371049a..33628b1e46090aa01d5ca75fbd65d249c307d5a5 100644
--- a/pkg/analysis_server/lib/src/protocol.dart
+++ b/pkg/analysis_server/lib/src/protocol.dart
@@ -7,6 +7,45 @@ library protocol;
 import 'dart:convert' show JsonDecoder;
 
 /**
+ * An abstract enumeration.
+ */
+abstract class Enum2<E extends Enum2> implements Comparable<E> {
+  /**
+   * The name of this enum constant, as declared in the enum declaration.
+   */
+  final String name;
+
+  /**
+   * The position in the enum declaration.
+   */
+  final int ordinal;
+
+  const Enum2(this.name, this.ordinal);
+
+  @override
+  int get hashCode => ordinal;
+
+  @override
+  String toString() => name;
+
+  int compareTo(E other) => ordinal - other.ordinal;
+
+  /**
+   * Returns the enum constant with the given [name], `null` if not found.
+   */
+  static Enum2 valueOf(List<Enum2> values, String name) {
+    for (int i = 0; i < values.length; i++) {
+      Enum2 value = values[i];
+      if (value.name == name) {
+        return value;
+      }
+    }
+    return null;
+  }
+}
+
+
+/**
  * Instances of the class [Request] represent a request that was received.
  */
 class Request {
@@ -283,6 +322,22 @@ class RequestDatum {
   }
 
   /**
+   * Validate that the datum is a list of strings, and convert it into [Enum]s.
+   */
+  Set<Enum2> asEnumSet(List<Enum2> allValues) {
+    Set values = new Set();
+    for (String name in asStringList()) {
+      Enum2 value = Enum2.valueOf(allValues, name);
+      if (value == null) {
+        throw new RequestFailure(new Response.invalidParameter(request, path,
+            "be a list of names from the list $allValues"));
+      }
+      values.add(value);
+    }
+    return values;
+  }
+
+  /**
    * Determine if the datum is a map whose values are all strings.
    *
    * Note: we can safely assume that the keys are all strings, since JSON maps