Design paterns for null arguments

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Design paterns for null arguments

Design paterns for null arguments

2004-05-28 - By Laxmish R. Hegde

Back

Reply: 1 2 3 4 5 6 7 8

I think sub class'ing the java.lang.exception and throwing that exception
should work fine for you.
Yes you can have a factory pattern to get the exception you would like to
throw back to the client.

Cheers,
Laxmish Hegde

-- --Original Message-- --
From: Sandeep Kachalia [mailto:skachalia@(protected)]
Sent: Friday, May 28, 2004 2:26 PM
To: J2EEPATTERNS-INTEREST@(protected)
Subject: Re: Design paterns for null arguments

Thanks Ben,
I wanted to open APIs for my client. The API users may pass null values as
arguments.
I have n number of parameters against I need to do null verification.
Can we apply some pattern here through which we check the nullability and
give customerized messages to user.

e.g.
public void myFunction(String a,String b,String c)
{ Object arguments[] ; // List of argument objects;
// patternApplied(Object arguments[]) throws Exception
}

I hope I am able to make it clear.

Thanks,
Sandeep

Ben Hill wrote:

On Fri, 2004-05-28 at 07:10, Sandeep Kachalia wrote:

Does exist a pattern for handling null arguments in a method.

any pointers??

Not a method per se. If you have some sort of idea what the null

handling should do, there may be a pattern to help.

Cheers,

Ben

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859 (See http://iso-8859.ora-code.com)-1">
<TITLE></TITLE>

<META content="MSHTML 5.50.4937.800" name=GENERATOR></HEAD>
<BODY text=#330099 bgColor=#ffffff>
<DIV>I
think sub class'ing  the java.lang.exception and throwing that
exception should work fine for
you.</DIV>
<DIV>Yes you can have a
factory pattern to get the exception you would like to throw back to
the client.</DIV>
<DIV>
 </DIV>
<DIV>Cheers,</DIV>
<DIV>Laxmish
Hegde</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>-- --Original
Message-- -- From: Sandeep Kachalia
[mailto:skachalia@(protected)] Sent: Friday, May 28, 2004 2:26
PM To: J2EEPATTERNS-INTEREST@(protected) Subject: Re:
Design paterns for null arguments </DIV>
<BLOCKQUOTE>Thanks Ben, I
wanted to open APIs for my client. The API users may pass null values as
arguments. I have n number of  parameters against I need to do null
verification. Can we apply some pattern here through which we check the
nullability and give customerized messages to user. e.g. public
void myFunction(String a,String b,String c) {    
Object  arguments[] ; // List of argument objects;  
     // patternApplied(Object arguments[]) throws
Exception } I hope I am able to make it
clear. Thanks, Sandeep Ben Hill wrote: 
<BLOCKQUOTE cite="mid1085735389.476.36.camel@(protected)" type="cite"><PRE wrap=
"">On Fri, 2004-05-28 at 07:10, Sandeep Kachalia wrote:
</PRE>
<BLOCKQUOTE type="cite"><PRE wrap="">Does exist a pattern for handling null
arguments in a method.
any pointers??
</PRE></BLOCKQUOTE><PRE wrap="">
Not a method per se. If you have some sort of idea what the null
handling should do, there may be a pattern to help.

Cheers,

Ben

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