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Java example source code file (

This example Java source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, class, intercept, jsonpostdeserializer, suppresswarnings

The Java example source code

 * Copyright (C) 2012 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;

 * Use this annotation to indicate various interceptors for class instances after
 * they have been processed by Gson. For example, you can use it to validate an instance
 * after it has been deserialized from Json.
 * Here is an example of how this annotation is used:
 * <p>Here is an example of how this annotation is used:
 * <p>
 * @Intercept(postDeserialize=UserValidator.class)
 * public class User {
 *   String name;
 *   String password;
 *   String emailAddress;
 * }
 * public class UserValidator implements JsonPostDeserializer<User> {
 *   public void postDeserialize(User user) {
 *     // Do some checks on user
 *     if ( == null || user.password == null) {
 *       throw new JsonParseException("name and password are required fields.");
 *     }
 *     if (user.emailAddress == null) {
 *       emailAddress = "unknown"; // assign a default value.
 *     }
 *   }
 * }
 * </pre>

* * @author Inderjeet Singh */ @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) public @interface Intercept { /** * Specify the class that provides the methods that should be invoked after an instance * has been deserialized. */ @SuppressWarnings("rawtypes") public Class<? extends JsonPostDeserializer> postDeserialize(); }

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