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ConverterCallAdapterFactory uses Retrofit's CallAdapter to pass the okhttp3.Request to a serializer like Jsoup. Idea and corrections from https://github.com/square/retrofit/issues/2267/.
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/* | |
* Copyright (C) 2017 Eric Cochran | |
* | |
* 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. | |
*/ | |
import java.io.IOException; | |
import java.lang.annotation.Annotation; | |
import java.lang.reflect.Type; | |
import okhttp3.Request; | |
import okhttp3.ResponseBody; | |
import retrofit2.Call; | |
import retrofit2.CallAdapter; | |
import retrofit2.Callback; | |
import retrofit2.Response; | |
import retrofit2.Retrofit; | |
public final class ConverterCallAdapterFactory extends CallAdapter.Factory { | |
public interface ResponseBodyConverter<T> { | |
T convert(Request request, ResponseBody body) throws IOException; | |
interface Factory { | |
ResponseBodyConverter<?> responseBodyConverter(Type type, Annotation[] annotations, | |
Retrofit retrofit); | |
} | |
} | |
private final ResponseBodyConverter.Factory converterFactory; | |
public ConverterCallAdapterFactory(ResponseBodyConverter.Factory converterFactory) { | |
this.converterFactory = converterFactory; | |
} | |
@Override | |
public CallAdapter<?, ?> get(Type returnType, Annotation[] annotations, Retrofit retrofit) { | |
@SuppressWarnings("unchecked") final CallAdapter<Object, ?> delegate = | |
(CallAdapter<Object, ?>) retrofit.nextCallAdapter(this, returnType, annotations); | |
@SuppressWarnings("unchecked") final ResponseBodyConverter<Object> converter = | |
(ResponseBodyConverter<Object>) converterFactory.responseBodyConverter( | |
delegate.responseType(), annotations, retrofit); | |
return new CallAdapter<ResponseBody, Object>() { | |
@Override public Type responseType() { | |
return ResponseBody.class; | |
} | |
@Override public Object adapt(Call<ResponseBody> call) { | |
return delegate.adapt(new ConverterCall<>(call, converter)); | |
} | |
}; | |
} | |
private static final class ConverterCall<T> implements Call<T> { | |
private final Call<ResponseBody> delegate; | |
final ResponseBodyConverter<T> converter; | |
ConverterCall(Call<ResponseBody> delegate, ResponseBodyConverter<T> converter) { | |
this.delegate = delegate; | |
this.converter = converter; | |
} | |
@Override public Response<T> execute() throws IOException { | |
Response<ResponseBody> response = delegate.execute(); | |
okhttp3.Response raw = response.raw(); | |
if (raw.isSuccessful()) { | |
return Response.success(converter.convert(delegate.request(), response.body()), raw); | |
} | |
return Response.error(raw.body(), raw); | |
} | |
@Override public void enqueue(final Callback<T> callback) { | |
delegate.enqueue(new Callback<ResponseBody>() { | |
@Override | |
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) { | |
okhttp3.Response raw = response.raw(); | |
Response<T> converted; | |
if (raw.isSuccessful()) { | |
try { | |
converted = | |
Response.success(converter.convert(call.request(), response.body()), raw); | |
} catch (IOException e) { | |
callback.onFailure(ConverterCall.this, e); | |
return; | |
} | |
} else { | |
converted = Response.error(raw.body(), raw); | |
} | |
callback.onResponse(ConverterCall.this, converted); | |
} | |
@Override public void onFailure(Call<ResponseBody> call, Throwable t) { | |
callback.onFailure(ConverterCall.this, t); | |
} | |
}); | |
} | |
@Override public boolean isExecuted() { | |
return delegate.isExecuted(); | |
} | |
@Override public void cancel() { | |
delegate.cancel(); | |
} | |
@Override public boolean isCanceled() { | |
return delegate.isCanceled(); | |
} | |
@Override public Call<T> clone() { | |
return new ConverterCall<>(delegate.clone(), converter); | |
} | |
@Override public Request request() { | |
return delegate.request(); | |
} | |
} | |
} |
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Retrofit retrofit = new Retrofit.Builder().baseUrl(server.url("/")) | |
.addCallAdapterFactory(new ConverterCallAdapterFactory( | |
new ConverterCallAdapterFactory.ResponseBodyConverter.Factory() { | |
@Override | |
public ConverterCallAdapterFactory.ResponseBodyConverter<?> responseBodyConverter( | |
final Type type, Annotation[] annotations, Retrofit retrofit) { | |
return new ConverterCallAdapterFactory.ResponseBodyConverter<Object>() { | |
@Override public Object convert(Request request, ResponseBody body) | |
throws IOException { | |
return Jsoup.parse(body.string(), request.url().toString()); | |
} | |
}; | |
} | |
})) | |
.build(); |
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