package jaskell.script;

import java.util.ArrayList;

import java.util.List;

import java.util.Optional;

public class Parameter<T> implements Directive {

private Optional<T> _value = null;

private Object _key;

private int _order;

private Class<T> _cls;

private String _placeHolder;

protected Parameter(){}

public Parameter(String placeHolder, Object key, Class<T> cls){

this._placeHolder = placeHolder;

_key = key;

_cls = cls;

}

public T value(){

return _value.orElse(null);

}

public void value(T v){

_value = Optional.ofNullable(v);

}

public boolean confirmed(){

return _value != null;

}

public String placeHolder(){

return _placeHolder;

}

public Class<T> valueClass(){

return _cls;

}

public Object key(){

return _key;

}

public int order(){

return _order;

}

public void order(int o){

this._order = o;

}

@Override

public String script() {

return _placeHolder;

}

@Override

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

List<Parameter<?>> re = new ArrayList<>();

re.add(this);

return re;

}

}