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Java example source code file (Intercept.java)
The Intercept.java 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 * * 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.interceptors; 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 (user.name == 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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