package jaskell.sql;

import jaskell.script.Directive;

import jaskell.script.Parameter;

import java.util.ArrayList;

import java.util.List;

import java.util.Optional;

public class Not extends Predicate {

Optional<Directive> _predicate;

Not(Directive predicate){

_predicate = Optional.of(predicate);

}

Not(){

_predicate = Optional.empty();

}

@Override

public String script() {

if (_predicate.isPresent()){

return String.format("NOT(%s)", _predicate.get().script());

} else {

return "NOT ";

}

}

@Override

public List<Parameter<?>> parameters() {

if(_predicate.isPresent()){

return _predicate.get().parameters();

} else {

return new ArrayList<>();

}

}

public Exists exists(Directive directive) {

Exists re = new Exists(directive);

re._prefix = Optional.of(this);

return re;

}

}