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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