final Integer index = metaConstraint.getIndex();
if (index != null && index >= 0) {
MetaParameter param = metaMethod.getParameter(index);
if (param == null) {
param = new MetaParameter(metaMethod, index);
metaMethod.addParameter(index, param);
}
param.addAnnotation(metaConstraint.getAnnotation());
} else {
metaMethod.addAnnotation(metaConstraint.getAnnotation());
}