ImmutableList.Builder<Part> parts = ImmutableList.<Part> builder();
for (Parameter param : parametersWithAnnotation(invocation.getInvokable(), PartParam.class)) {
PartParam partParam = param.getAnnotation(PartParam.class);
PartOptions options = new PartOptions();
if (!PartParam.NO_CONTENT_TYPE.equals(partParam.contentType()))
options.contentType(partParam.contentType());
if (!PartParam.NO_FILENAME.equals(partParam.filename()))
options.filename(replaceTokens(partParam.filename(), tokenValues));
Object arg = invocation.getArgs().get(param.hashCode());
checkNotNull(arg, partParam.name());
Part part = Part.create(partParam.name(), newPayload(arg), options);