JacksonConverter.java

package retrofit.converter;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import retrofit.mime.TypedByteArray;
import retrofit.mime.TypedInput;
import retrofit.mime.TypedOutput;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;

/**
 * A {@link Converter} which uses Jackson for reading and writing entities.
 *
 * @author Kai Waldron (kaiwaldron@gmail.com)
 */
public class JacksonConverter implements Converter
{
  private static final String MIME_TYPE = "application/json; charset=UTF-8";

  private final ObjectMapper objectMapper;

  public JacksonConverter(ObjectMapper objectMapper)
  {
    this.objectMapper = objectMapper;
  }

  @Override
  public Object fromBody(TypedInput body, final Type type) throws ConversionException
  {
    try
    {
      final JavaType javaType = objectMapper.getTypeFactory().constructType(type);
      return objectMapper.readValue(body.in(), javaType);
    }
    catch (final JsonParseException e)
    {
      throw new ConversionException(e);
    }
    catch (final JsonMappingException e)
    {
      throw new ConversionException(e);
    }
    catch (final IOException e)
    {
      throw new ConversionException(e);
    }
  }

  @Override
  public TypedOutput toBody(Object object)
  {
    try
    {
      final String json = objectMapper.writeValueAsString(object);
      return new TypedByteArray(MIME_TYPE, json.getBytes("UTF-8"));
    }
    catch (final JsonProcessingException e)
    {
      throw new AssertionError(e);
    }
    catch (final UnsupportedEncodingException e)
    {
      throw new AssertionError(e);
    }
  }
}