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 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.


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 since a member or a type has been present.
 * This annotation is useful to manage versioning of your Json classes for a web-service.

* This annotation has no effect unless you build {@link} with a * {@link} and invoke * {@link} method. * *

Here is an example of how this annotation is meant to be used:

 * public class User {
 *   private String firstName;
 *   private String lastName;
 *   @Since(1.0) private String emailAddress;
 *   @Since(1.0) private String password;
 *   @Since(1.1) private Address address;
 * }
* *

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(1.0).create()} then the * {@code toJson()} and {@code fromJson()} methods of Gson will exclude the {@code address} field * since it's version number is set to {@code 1.1}.

* * @author Inderjeet Singh * @author Joel Leitch */ @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.FIELD, ElementType.TYPE}) public @interface Since { /** * the value indicating a version number since this member * or type has been present. */ double value(); }

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