/*
* Copyright (C) 2017 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 retrofit.converter.guava;
import com.google.common.base.Optional;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import javax.annotation.Nullable;
import okhttp3.ResponseBody;
import retrofit2.Converter;
import retrofit2.Retrofit;
/**
* A {@linkplain Converter.Factory converter} for {@code Optional<T>} which delegates to another
* converter to deserialize {@code T} and then wraps it into {@link Optional}.
*/
public final class GuavaOptionalConverterFactory extends Converter.Factory {
public static GuavaOptionalConverterFactory create() {
return new GuavaOptionalConverterFactory();
}
private GuavaOptionalConverterFactory() {
}
@Nullable @Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations,
Retrofit retrofit) {
if (getRawType(type) != Optional.class) {
return null;
}
Type innerType = getParameterUpperBound(0, (ParameterizedType) type);
Converter<ResponseBody, Object> delegate =
retrofit.nextResponseBodyConverter(this, innerType, annotations);
return new OptionalConverter<>(delegate);
}
}