ValueMessageBodyWriter.java 文件源码

/**
 * {@inheritDoc}
 */
@SuppressWarnings("unchecked")
@Override
public void writeTo(Value<?> entity,
                    Class<?> type,
                    Type genericType,
                    Annotation[] annotations,
                    MediaType mediaType,
                    MultivaluedMap<String, Object> httpHeaders,
                    OutputStream entityStream)
        throws IOException {
    final Object entityValue = entity.getOrElseThrow(() -> EmptyValueException.INSTANCE);
    final Class<?> entityClass = entityValue.getClass();

    final Type actualGenericTypeArgument;
    if (genericType instanceof ParameterizedType) {
        actualGenericTypeArgument = ((ParameterizedType) genericType).getActualTypeArguments()[0];
    } else {
        actualGenericTypeArgument = entityClass;
    }

    final MessageBodyWriter writer = mbw.get().getMessageBodyWriter(entityClass, actualGenericTypeArgument, annotations, mediaType);
    writer.writeTo(entityValue, entityClass, actualGenericTypeArgument, annotations, mediaType, httpHeaders, entityStream);
}