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JsonAndXmlConverters.java
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JsonAndXmlConverters.java
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/*
* Copyright (C) 2016 Square, 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.example.retrofit;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.reflect.Type;
import javax.annotation.Nullable;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import okhttp3.mockwebserver.MockResponse;
import okhttp3.mockwebserver.MockWebServer;
import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Default;
import org.simpleframework.xml.DefaultType;
import retrofit2.Call;
import retrofit2.Converter;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.converter.simplexml.SimpleXmlConverterFactory;
import retrofit2.http.GET;
/**
* Both the Gson converter and the Simple Framework converter accept all types. Because of this, you
* cannot use both in a single service by default. In order to work around this, we can create
* an @Json and @Xml annotation to declare which serialization format each endpoint should use and
* then write our own Converter.Factory which delegates to either the Gson or Simple Framework
* converter.
*/
public final class JsonAndXmlConverters {
@Retention(RUNTIME)
@interface Json {}
@Retention(RUNTIME)
@interface Xml {}
static class QualifiedTypeConverterFactory extends Converter.Factory {
private final Converter.Factory jsonFactory;
private final Converter.Factory xmlFactory;
QualifiedTypeConverterFactory(Converter.Factory jsonFactory, Converter.Factory xmlFactory) {
this.jsonFactory = jsonFactory;
this.xmlFactory = xmlFactory;
}
@Override
public @Nullable Converter<ResponseBody, ?> responseBodyConverter(
Type type, Annotation[] annotations, Retrofit retrofit) {
for (Annotation annotation : annotations) {
if (annotation instanceof Json) {
return jsonFactory.responseBodyConverter(type, annotations, retrofit);
}
if (annotation instanceof Xml) {
return xmlFactory.responseBodyConverter(type, annotations, retrofit);
}
}
return null;
}
@Override
public @Nullable Converter<?, RequestBody> requestBodyConverter(
Type type,
Annotation[] parameterAnnotations,
Annotation[] methodAnnotations,
Retrofit retrofit) {
for (Annotation annotation : parameterAnnotations) {
if (annotation instanceof Json) {
return jsonFactory.requestBodyConverter(
type, parameterAnnotations, methodAnnotations, retrofit);
}
if (annotation instanceof Xml) {
return xmlFactory.requestBodyConverter(
type, parameterAnnotations, methodAnnotations, retrofit);
}
}
return null;
}
}
@Default(value = DefaultType.FIELD)
static class User {
@Attribute public String name;
}
interface Service {
@GET("/")
@Json
Call<User> exampleJson();
@GET("/")
@Xml
Call<User> exampleXml();
}
public static void main(String... args) throws IOException {
MockWebServer server = new MockWebServer();
server.start();
server.enqueue(new MockResponse().setBody("{\"name\": \"Jason\"}"));
server.enqueue(new MockResponse().setBody("<user name=\"Eximel\"/>"));
Retrofit retrofit =
new Retrofit.Builder()
.baseUrl(server.url("/"))
.addConverterFactory(
new QualifiedTypeConverterFactory(
GsonConverterFactory.create(), SimpleXmlConverterFactory.create()))
.build();
Service service = retrofit.create(Service.class);
User user1 = service.exampleJson().execute().body();
System.out.println("User 1: " + user1.name);
User user2 = service.exampleXml().execute().body();
System.out.println("User 2: " + user2.name);
server.shutdown();
}
}