Issue 3752. Support for @override annotations (as structured doc comments)

compiler/java/com/google/dart/compiler/ast/DartMetadata.java

+// Copyright (c) 2012, 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.
+
+package com.google.dart.compiler.ast;
+
+/**
+ * Some metadata information attached to the {@link DartDeclaration}.
+ */
+public class DartMetadata {
+  public static final DartMetadata EMPTY = new DartMetadata(false, false);
+  private boolean deprecated;
+  private boolean override;
+
+  private DartMetadata(boolean deprecated, boolean override) {
+    this.deprecated = deprecated;
+    this.override = override;
+  }
+
+  public DartMetadata makeDeprecated() {
+    return new DartMetadata(true, override);
+  }
+
+  public DartMetadata makeOverride() {
+    return new DartMetadata(deprecated, true);
+  }
+
+  public boolean isDeprecated() {
+    return deprecated;
+  }
+
+  public boolean isOverride() {
+    return override;
+  }
+}