package jaskell.sql;

import jaskell.script.Directive;

import jaskell.script.Parameter;

import java.util.List;

import java.util.Optional;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class Exists extends Predicate {

Optional<Directive> _prefix;

Directive directive;

Exists(Directive directive){

_prefix = Optional.empty();

this.directive = directive;

}

@Override

public String script() {

if(_prefix.isPresent()) {

return String.format("%s EXISTS(%s)", _prefix.get().script(), directive.script());

}else {

return String.format("EXISTS(%s)", directive.script());

}

}

@Override

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

if (_prefix.isPresent()){

return Stream.concat(_prefix.get().parameters().stream(), directive.parameters().stream())

.collect(Collectors.toList());

}else {

return directive.parameters();

}

}

}