--- /dev/null
+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * 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.gson.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * An annotation that indicates the version number until a member or a type should be present.
+ * Basically, if Gson is created with a version number that exceeds the value stored in the
+ * {@code Until} annotation then the field will be ignored from the JSON output. This annotation
+ * is useful to manage versioning of your JSON classes for a web-service.
+ *
+ * <p>
+ * This annotation has no effect unless you build {@link com.google.gson.Gson} with a
+ * {@link com.google.gson.GsonBuilder} and invoke
+ * {@link com.google.gson.GsonBuilder#setVersion(double)} method.
+ *
+ * <p>Here is an example of how this annotation is meant to be used:</p>
+ * <pre>
+ * public class User {
+ * private String firstName;
+ * private String lastName;
+ * @Until(1.1) private String emailAddress;
+ * @Until(1.1) private String password;
+ * }
+ * </pre>
+ *
+ * <p>If you created Gson with {@code new Gson()}, the {@code toJson()} and {@code fromJson()}
+ * methods will use all the fields for serialization and deserialization. However, if you created
+ * Gson with {@code Gson gson = new GsonBuilder().setVersion(1.2).create()} then the
+ * {@code toJson()} and {@code fromJson()} methods of Gson will exclude the {@code emailAddress}
+ * and {@code password} fields from the example above, because the version number passed to the
+ * GsonBuilder, {@code 1.2}, exceeds the version number set on the {@code Until} annotation,
+ * {@code 1.1}, for those fields.
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ * @since 1.3
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.TYPE})
+public @interface Until {
+
+ /**
+ * the value indicating a version number until this member
+ * or type should be ignored.
+ */
+ double value();
+}