Re: Question about XThis

It all depends on what your goals and expectations are .
You can make really nice "classes" out of functions by returning this.

foo() {
    int a = 1 ;
    int b = 2;
    return this ;
}

c = foo();

print(c.a);

1



----
What you were trying to do is entirely different, a function that simply 
creates *another object* and returns *that*
Thats entirely different from the "XThis" concept.

You can have it both ways.
If you want to mix the 2 concepts you could do this :

init_txservice(){

	
	example.TransactionService ts = 
		new example.TransactionService.TransactionService(accountdao.initialize());

        return this;
 }

myservice = init_txservice();

myservice.ts.doSomething()















David A. Lee
[email protected]  
http://www.calldei.com
http://www.xmlsh.org
812-482-5224



neo anderson wrote:
> Yes. That's the thing that goes weird. 
>
> Now I've changed every return instance to its own variable, instead of this.
> For instance, 
>
>  init_txservice(){ ... return ts; } // return instance of ts
>
> not 
>
>  init_txservice(){ ... return this; } 
>
> The problem now goes away. But what I am curious is that previously each
> code block is 
>
> init_xxxxxx(){ ... return this; }
>
> They all return `this'. It does compile and no error thrown out until I add
> the code block - init_txservice() { ... }
>
> If return this is wrong. Why other code block get compiled? If it is not
> worng, why init_txservice() { ... }  throws error?
>
> Thanks again for your help.
>
> I appreciate it.
>
> Christophe Vanfleteren wrote:
>   
>> Shouldn't you return ts instead of this? ie:
>>
>>  init_txservice(){
>>
>>         import example.TransactionService;
>>
>>         ts = new TransactionService(accountdao.initialize());
>>
>>         return ts;
>>  }
>>
>> txservice = init_txservice();
>>
>> On Sat, Nov 14, 2009 at 8:13 PM, neo anderson
>> <javadeveloper999-/[email protected]> wrote:
>>     
>>> I encounter a problem when obtaining Java object from beanshell script.
>>> The
>>> error shows
>>>
>>> java.lang.ClassCastException: bsh.XThis cannot be cast to
>>> example.TransactionService
>>>
>>> code snippet used to create that instance is
>>>
>>> init_txservice(){
>>>
>>>        import example.TransactionService;
>>>
>>>        ts = new TransactionService(accountdao.initialize());
>>>
>>>        return this;
>>> }
>>>
>>> txservice = init_txservice();
>>>
>>> After re-reading the bsh docs, in `Scripted Objects '
>>> (http://www.beanshell.org/manual/bshmanual.html ) it says that this can
>>> be
>>> used to create scripted object using method closures. So it looks like my
>>> code to create txservice is not correct; And when I switch to return ts (
>>> ts
>>> = new TransactionServcie(...) ) the error seems to go away.
>>>
>>> But now a question raises. I use `return this' in other method closure
>>> which
>>> has similar way to return instance, but why other code snippet does not
>>> throw the same error i.e. ClassCastException?
>>>
>>> Other code like
>>>
>>> init_mock_datasource(){
>>>
>>>        import org.clin4j.framework.domain.mock.Driver;
>>>
>>>        d = "com.mockdb.jdbc.Driver";
>>>        url = "jdbc:mockdb://localhost/ecommerce";
>>>        id = "user";
>>>        pass = "password";
>>>
>>>        driver = new Driver(d, url, id, pass);
>>>
>>>        return this;
>>> }
>>>
>>>
>>> when objecting java object using this code snippet, everything works
>>> well.
>>>
>>> Does any reason can explain this problem?
>>>
>>> Thanks for help.
>>> --
>>> View this message in context:
>>> http://old.nabble.com/Question-about-XThis-tp26352954p26352954.html
>>> Sent from the BeanShell - User mailing list archive at Nabble.com.
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>>> 30-Day
>>> trial. Simplify your report design, integration and deployment - and
>>> focus on
>>> what you do best, core application coding. Discover what's new with
>>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>>> _______________________________________________
>>> Beanshell-users mailing list
>>> Beanshell-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>>> https://lists.sourceforge.net/lists/listinfo/beanshell-users
>>>
>>>       
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>> 30-Day 
>> trial. Simplify your report design, integration and deployment - and focus
>> on 
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> Beanshell-users mailing list
>> Beanshell-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>> https://lists.sourceforge.net/lists/listinfo/beanshell-users
>>
>>
>>     
>
>   
------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day 
trial. Simplify your report design, integration and deployment - and focus on 
what you do best, core application coding. Discover what's new with
Crystal Reports now.  http://p.sf.net/sfu/bobj-july