Re: Static method

From:

Mark Space <markspace@sbc.global.net>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 03 May 2008 15:58:43 -0700

Message-ID:

<Q66Tj.2023$3O7.164@newssvr19.news.prodigy.net>

ojvm24@gmail.com wrote:

I have a static method which has the following signature.

<code>
public static List createBeanCollection(){
}
</code>

I can't chage this, now this is the problem. how can i pass it
parameters
so in the method i can use them and return a dinamic list of objects,
i'm using ibatis
for test purposes i did the following.

<code>
public static List createBeanCollection(){
   MiBean m = new MiBean();
   m.setNombre("prueba");
   List beans = new ArrayList();
   beans.add(m);
   return beans;

}
</code>

ok, it works fine, but now i want to replace the list i created by
hand with an
object that makes a query over a db, so the code would be this.
<code>
public static List createBeanCollection(){
   List beans = miDao.onbtenObjetosPorId(valor);//dao that retrives
object from a db.
   return beans;
}
</code>
but i cant use the "valor" parameter, due is not possible to use a no
static-variable
in a static method. at the moment i've resolved it in this way

<code>
public static int valor;//the variable was declared as static.

public static List createBeanCollection(){
   List beans = miDao.onbtenObjetosPorId(valor);//i can use it now
   return beans;
}
</code>
however this solution is not the best, because i'm expossing the
properties of my class
hope you can help me with this little problem, just remember i can't
change the method
signature.

Thank you in advance.

Probably a better way to handle this is just to use a setter to set the
value of valor.

public class BeanWrapper {

   private int valor;

   public static void setValor( int v )
   {
     valor = v;
   }

   public static List createBeanCollection()
   {
     return miDao.onbtenObjectosPorId( valor );
   }
}

Now this is a tad dangerous, you'll get issues with concurrency and
what-not. But it might suit your needs.

Have you considered a non-static method? It seems to me that would solve
a lot more problems. You could also inject a non-static object into the
wrapper class.

public class BeanWrapper {

   private Beans b;

   public static void setValor( Beans v )
   {
     b = v;
   }

   public static List createBeanCollection()
   {
     return b.onbtenObjectosPorId();
   }
}

where a Beans object has the "valor" injected into it, ie.,

   setValor( new Beans( 1 ) );

Now you also have a fully constructed object that you can synchronize
on, for example. And it's private, so no one else can call it but your
createBeanCollection() method.

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