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A type-safe HTTP client for Android and Java.
There is a newer version: 2.11.0
/*
 * Copyright (C) 2015 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 retrofit2;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.annotation.Nullable;
import kotlin.Unit;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.http.Streaming;

final class BuiltInConverters extends Converter.Factory {
  /** Not volatile because we don't mind multiple threads discovering this. */
  private boolean checkForKotlinUnit = true;

  @Override
  public @Nullable Converter responseBodyConverter(
      Type type, Annotation[] annotations, Retrofit retrofit) {
    if (type == ResponseBody.class) {
      return Utils.isAnnotationPresent(annotations, Streaming.class)
          ? StreamingResponseBodyConverter.INSTANCE
          : BufferingResponseBodyConverter.INSTANCE;
    }
    if (type == Void.class) {
      return VoidResponseBodyConverter.INSTANCE;
    }
    if (checkForKotlinUnit) {
      try {
        if (type == Unit.class) {
          return UnitResponseBodyConverter.INSTANCE;
        }
      } catch (NoClassDefFoundError ignored) {
        checkForKotlinUnit = false;
      }
    }
    return null;
  }

  @Override
  public @Nullable Converter requestBodyConverter(
      Type type,
      Annotation[] parameterAnnotations,
      Annotation[] methodAnnotations,
      Retrofit retrofit) {
    if (RequestBody.class.isAssignableFrom(Utils.getRawType(type))) {
      return RequestBodyConverter.INSTANCE;
    }
    return null;
  }

  static final class VoidResponseBodyConverter implements Converter {
    static final VoidResponseBodyConverter INSTANCE = new VoidResponseBodyConverter();

    @Override
    public Void convert(ResponseBody value) {
      value.close();
      return null;
    }
  }

  static final class UnitResponseBodyConverter implements Converter {
    static final UnitResponseBodyConverter INSTANCE = new UnitResponseBodyConverter();

    @Override
    public Unit convert(ResponseBody value) {
      value.close();
      return Unit.INSTANCE;
    }
  }

  static final class RequestBodyConverter implements Converter {
    static final RequestBodyConverter INSTANCE = new RequestBodyConverter();

    @Override
    public RequestBody convert(RequestBody value) {
      return value;
    }
  }

  static final class StreamingResponseBodyConverter
      implements Converter {
    static final StreamingResponseBodyConverter INSTANCE = new StreamingResponseBodyConverter();

    @Override
    public ResponseBody convert(ResponseBody value) {
      return value;
    }
  }

  static final class BufferingResponseBodyConverter
      implements Converter {
    static final BufferingResponseBodyConverter INSTANCE = new BufferingResponseBodyConverter();

    @Override
    public ResponseBody convert(ResponseBody value) throws IOException {
      try {
        // Buffer the entire body to avoid future I/O.
        return Utils.buffer(value);
      } finally {
        value.close();
      }
    }
  }

  static final class ToStringConverter implements Converter {
    static final ToStringConverter INSTANCE = new ToStringConverter();

    @Override
    public String convert(Object value) {
      return value.toString();
    }
  }
}