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Java example source code file (

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Java - Java tags/keywords

annotation, target, until

The Java example source code

 * 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 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} with a
 * {@link} and invoke
 * {@link} method.
 * <p>Here is an example of how this annotation is meant to be used:

* <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(); }

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