/**
* Registers the given parameter.
*/
void registerParameter(ParameterExpressionImpl<?> p) {
if (_params == null)
_params = new OrderedMap/*<ParameterExpression<?>, Class<?>*/();
if (!_params.containsKey(p)) {
p.setIndex(_params.size());
_params.put(p, p.getJavaType());
}
}