Import code from internal repository to git

java/com/google/domain/registry/util/XmlEnumUtils.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.domain.registry.util;
+
+import com.google.common.base.Throwables;
+
+import javax.xml.bind.annotation.XmlEnumValue;
+
+/** Utility methods related to xml enums. */
+public class XmlEnumUtils {
+  /** Read the {@link XmlEnumValue} string off of an enum. */
+  public static String enumToXml(Enum<?> input) {
+    try {
+      return input.getClass().getField(input.name()).getAnnotation(XmlEnumValue.class).value();
+    } catch (NoSuchFieldException e) {
+      throw Throwables.propagate(e);
+    }
+  }
+}