Index: dart/sdk/lib/_collection_dev/symbol.dart |
diff --git a/dart/sdk/lib/_collection_dev/symbol.dart b/dart/sdk/lib/_collection_dev/symbol.dart |
new file mode 100644 |
index 0000000000000000000000000000000000000000..1a81f4767fd1c08d18f34cc543d27bb04ea114f1 |
--- /dev/null |
+++ b/dart/sdk/lib/_collection_dev/symbol.dart |
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+// Copyright (c) 2013, 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. |
+ |
+part of dart._collection.dev; |
+ |
+/** |
+ * Implementation of [core.Symbol]. This class uses the same name as |
+ * a core class so a user can't tell the difference. |
+ * |
+ * The purpose of this class is to hide [_name] from user code, but |
+ * make it accessible to Dart platform code via the static method |
+ * [getName]. |
+ */ |
+class Symbol implements core.Symbol { |
+ final String _name; |
+ |
+ external const Symbol(String name); |
+ |
+ /** |
+ * Platform-private method used by the mirror system to create |
+ * otherwise invalid names. |
+ */ |
+ const Symbol.unvalidated(this._name); |
+ |
+ bool operator ==(other) => other is Symbol && _name == other._name; |
+ |
+ int get hashCode { |
+ const arbitraryPrime = 664597; |
+ return 0x1fffffff & (arbitraryPrime * _name.hashCode); |
+ } |
+ |
+ /// Platform-private accessor which cannot be called from user libraries. |
+ static String getName(Symbol symbol) => symbol._name; |
+} |