61 lines
2.2 KiB
Java
61 lines
2.2 KiB
Java
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/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.annotations;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* An annotation that indicates the version number since a member or a type has been present.
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* This annotation is useful to manage versioning of your Json classes for a web-service.
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*
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* <p>
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* This annotation has no effect unless you build {@link com.google.gson.Gson} with a
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* {@link com.google.gson.GsonBuilder} and invoke
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* {@link com.google.gson.GsonBuilder#setVersion(double)} method.
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*
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* <p>Here is an example of how this annotation is meant to be used:</p>
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* <pre>
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* public class User {
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* private String firstName;
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* private String lastName;
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* @Since(1.0) private String emailAddress;
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* @Since(1.0) private String password;
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* @Since(1.1) private Address address;
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* }
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* </pre>
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*
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* <p>If you created Gson with {@code new Gson()}, the {@code toJson()} and {@code fromJson()}
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* methods will use all the fields for serialization and deserialization. However, if you created
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* Gson with {@code Gson gson = new GsonBuilder().setVersion(1.0).create()} the the
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* {@code toJson()} and {@code fromJson()} methods of Gson will exclude the {@code address} field
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* since it's version number is set to {@code 1.1}.</p>
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*
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* @author Inderjeet Singh
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*/
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@Retention(RetentionPolicy.RUNTIME)
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@Target({ElementType.FIELD, ElementType.TYPE})
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public @interface Since {
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/**
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* the value indicating a version number since this member
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* or type has been present.
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*/
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double value();
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}
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