Import code from internal repository to git

java/com/google/domain/registry/model/domain/Period.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.model.domain;
+
+
+import com.google.domain.registry.model.ImmutableObject;
+
+import com.googlecode.objectify.annotation.Embed;
+
+import javax.xml.bind.annotation.XmlAttribute;
+import javax.xml.bind.annotation.XmlEnumValue;
+import javax.xml.bind.annotation.XmlValue;
+
+/** The "periodType" from {@link "http://tools.ietf.org/html/rfc5731"}. */
+@Embed
+public class Period extends ImmutableObject {
+
+  @XmlAttribute
+  Unit unit;
+
+  @XmlValue
+  Integer value;
+
+  public Unit getUnit() {
+    return unit;
+  }
+
+  public Integer getValue() {
+    return value;
+  }
+
+  /** The unit enum. */
+  public enum Unit {
+    @XmlEnumValue("y")
+    YEARS,
+
+    @XmlEnumValue("m")
+    MONTHS,
+  }
+
+  public static Period create(int value, Unit unit) {
+    Period instance = new Period();
+    instance.value = value;
+    instance.unit = unit;
+    return instance;
+  }
+}