Added "Until" type version. This new annotation allows you to remove members from the JSON output beginning at a certain version number.
This new annotation work in conjunction with the "@Since" annotation.
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@ -17,6 +17,7 @@
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package com.google.gson;
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import com.google.gson.annotations.Since;
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import com.google.gson.annotations.Until;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Field;
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@ -45,12 +46,29 @@ final class VersionExclusionStrategy implements ExclusionStrategy {
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private boolean isValidVersion(Annotation[] annotations) {
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for (Annotation annotation : annotations) {
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if (!isValidSince(annotation) || !isValidUntil(annotation)) {
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return false;
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}
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}
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return true;
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}
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private boolean isValidSince(Annotation annotation) {
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if (annotation instanceof Since) {
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double annotationVersion = ((Since) annotation).value();
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if (annotationVersion > version) {
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return false;
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}
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}
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return true;
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}
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private boolean isValidUntil(Annotation annotation) {
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if (annotation instanceof Until) {
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double annotationVersion = ((Until) annotation).value();
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if (annotationVersion <= version) {
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return false;
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}
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}
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return true;
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}
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63
gson/src/main/java/com/google/gson/annotations/Until.java
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63
gson/src/main/java/com/google/gson/annotations/Until.java
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@ -0,0 +1,63 @@
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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 until a member or a type should be present.
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* Basically, if Gson is created with a version number that exceeds the value stored in the
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* {@code Until} annotation then the field will be ignored from the JSON output. This annotation
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* 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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* @Until(1.1) private String emailAddress;
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* @Until(1.1) private String password;
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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(1.2).create()} the the
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* {@code toJson()} and {@code fromJson()} methods of Gson will exclude the {@code emailAddress}
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* and {@code password} fields because the version number passed to the GsonBuilder, {@code 1.2},
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* exceeds the version number set on the {@code Until} annotation for those fields.
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*
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* @author Joel Leitch
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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 Until {
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/**
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* the value indicating a version number until this member
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* or type should be ignored.
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*/
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double value();
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}
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@ -18,6 +18,7 @@ package com.google.gson.functional;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.annotations.Since;
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import com.google.gson.annotations.Until;
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import com.google.gson.common.TestTypes.BagOfPrimitives;
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import junit.framework.TestCase;
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@ -42,6 +43,17 @@ public class VersioningTest extends TestCase {
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builder = new GsonBuilder();
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}
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public void testVersionedUntilSerialization() {
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Version1 target = new Version1();
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Gson gson = builder.setVersion(1.29).create();
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String json = gson.toJson(target);
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assertTrue(json.contains("\"a\":" + A));
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gson = builder.setVersion(1.3).create();
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json = gson.toJson(target);
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assertFalse(json.contains("\"a\":" + A));
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}
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public void testVersionedClassesSerialization() {
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Gson gson = builder.setVersion(1.0).create();
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String json1 = gson.toJson(new Version1());
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@ -97,7 +109,7 @@ public class VersioningTest extends TestCase {
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}
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private static class Version1 {
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int a = A;
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@Until(1.3) int a = A;
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@Since(1.0) int b = B;
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}
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