Matt,
Understood, and thanks! However, the WebContextor class, which I did not originally
write, contains a total of about 12 methods, not just run(). Each method currently
requires the blob be handled in the 'pass by reference' manner, but two or three of
those 12 methods are not void methods and do return values. The original developer
used this 'pass by reference' ability to basically return more than one value at a
time from some of the methods.
Because some methods do return a value your Wrapper suggestion probably won't work for
all the methods, only the ones that are void methods. Since your Wrapper is already
passing a Sting[] back it can't pass back the other non-void data type.
Do you know of any way other than
String[] SArray = new String[1]
to create a Java array? Even a Java Integer can be created as an instanced class
object intead of as a primitive. Or would that not help me since I would then have to
pass this new Array object into the CFOBJECT's method, which would again 'copy' the
value and not 'reference' it?? Seems like it should pass by reference if it's
anything more complicated than the standard datatypes that CF recognizes and can
automatically convert.
I mean, if I did the following:
<cfobject action="create" type="java" class="java.net.ServerSocket" name="mservsocket">
<cfobject action="create" type="java" class="java.net.Socket" name="msocket">
<cfset mservsocket.implAccept(msocket)>
Then CF wouldn't be able to convert the msocket into a string and pass a copy, would
it? Wouldn't it pass a reference to the Socket object into the implAccept() method
instead?
I don't know if it would, or if you can use methods to create Java Array objects, or
if those Array objects would pass by reference or value, but that's what I'm looking
for a way to do.
Thanks for your help Matt!
Darren
>>> [EMAIL PROTECTED] 06/18/02 03:00PM >>>
With CF 4.5 you can only pass data to Java objects by value. Either you
should change your run() method to return back the new value or if can't
do that, then you should create a wrapper class. Off the top of my
head...
public class Wrapper
{
public String[] run(String blob[])
{
WebContextor mcontextor = new WebContextor();
mcontextor.run(blob);
return blob;
}
}
-Matt
> -----Original Message-----
> From: Darren Houle [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, June 18, 2002 11:23 AM
> To: CF-Talk
> Subject: CFOBJECT: Pass By Value vs. Pass By Reference
>
> Hello! New to this list - in the hopes that I can find some advice
for a
> tricky problem that I am facing:
>
> Problem: I need to use CFOBJECT to instantiate a Java class and then
run
> a few of its methods. The methods require an array be passed in as a
> parameter when called.
>
> Normally, in Java, you would do something like this:
>
> String[] blob = new String[1];
> blob[0] = "original text";
> WebContextor mcontextor = new WebContextor();
> mcontextor.run(blob);
> out.println(blob);
>
> * Output would be "Some New Altered Text"
>
> As you can see, there is no return value for the run() method. Inside
the
> run() method the blob array is altered but it is not returned by the
> method, instead, the blob is somehow automatically 'passed by
reference'
> by Java into the method and the new altered value is now available to
the
> rest of the code in the main body upon return.
>
> When I use CFOBJECT to create the WebContextor class and call the
run()
> method, passing a CF array[], the values in the array are apparently
> 'passed by value' to the method. A copy is made of the array when it
is
> passed to run() so when I return from run() the original CF array has
not
> been altered and the new altered value is not available to the rest of
the
> CF code.
>
> <cfobject action="create" type="java" class="WebContextor"
> name="mcontextor">
> <cfset blob = arrayNew(1)>
> <cfset blob[1]="original text">
> <cfset mcontextor.run(blob)>
> <cfoutput>#blob[1]#</cfoutput>
>
> Output is "original text" - the contents of the array within this CF
page
> apparently has not been altered.
>
> I realize that there may be ways around this by creating and calling
> custom tags that, in turn, call the WebContextor, however, I would
like to
> know if anyone knows of a way to achieve this without using a custom
tag.
> I keep thinking that instead of passing a CF array to the run() method
I
> should first create a new Java Array CFOBJECT that can store the CF
array,
> and when the CFOBJECT WebContextor is instanced and it's run() method
> called, the Java Array can be passed instead of the CF array. Maybe
that
> will cause it to be passed by reference instead of by value?
>
> I am currently on CF Enterprise server 4.5 but have a new copy of MX
> Enterprise sitting on my desk. Don't know if anything along these
lines
> has changed in MX or if this is something I can already do in 4.5 but
any
> help at all would be tremendously appreciated !!!!
>
> Thanks,
> Darren Houle
> Sr. Web Developer
> Health First, Inc.
>
>
> "MMS <health-first.org>" made the following
> annotations on 06/18/02 14:39:22
>
------------------------------------------------------------------------
--
> ----
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If
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