OptionalMessageBodyWriter.java 文件源码

@SuppressWarnings({"rawtypes", "unchecked"})
@Override
public void writeTo(Optional<?> entity,
                    Class<?> type,
                    Type genericType,
                    Annotation[] annotations,
                    MediaType mediaType,
                    MultivaluedMap<String, Object> httpHeaders,
                    OutputStream entityStream)
        throws IOException {
    if (!entity.isPresent()) {
        throw new NotFoundException();
    }

    final Type innerGenericType = (genericType instanceof ParameterizedType) ?
        ((ParameterizedType) genericType).getActualTypeArguments()[0] : entity.get().getClass();

    MessageBodyWriter writer = mbw.get().getMessageBodyWriter(entity.get().getClass(),
        innerGenericType, annotations, mediaType);
    writer.writeTo(entity.get(), entity.get().getClass(),
        innerGenericType, annotations, mediaType, httpHeaders, entityStream);
}