[kepler-users] string splitter

[Christopher Brooks]

Hi Corinna,
This seems like a design problem in the underlying Java library:

kepler/actors/src/org/resurgence/actor/StringSplitter.java
uses java.util.String.split()

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#split%28java.lang.String%29
says
>  This method works as if by invoking the two-argument split  method with the given expression
 >  and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.
>
> The string "boo:and:foo", for example, yields the following results with these expressions:
>
>     Regex 	Result
>     : 	{ "boo", "and", "foo" }
>     o 	{ "b", "", ":and:f" }

I added a comment to StringSplitter about this limitation.

Probably what we need in this case is a StringTokenizer actor.

_Christopher


On 6/10/10 12:20 PM, Corinna Gries wrote:
> Hi Madhu,
>
> when I run the attached workflow the output is this:
>
> {"6/19/2009", "CEW", "", "6/10/2009", "6", "1", "1000", "52.5", "31",
> "1", "1", "1.017410714", "0.625589286", "1.3125"}
>
> and it is missing the empty string in position 14. I think you may have
> had a space after the last comma, which made it work just fine.
>
> Corinna
>
> Madhusudan Gujral wrote:
>> Hi Corinna,
>>
>> I passed the splitter results to dsplay actor. What I observe if
>> following
>> {"6/19/2009", "CEW", "", "6/10/2009", "6", "1", "1000", "52.5", "31",
>> "1", "1", "1.017410714", "0.625589286", "1.3125", "", " "}
>>
>> It has elements 14 'No Space' and 15 'Space' displayed correctly. When
>> I used Array Element actor to display the values for element 14, 15,
>> it does not complain, but there is nothing to show.
>> My guess is that the problem is related to post processing (processing
>> the empty tokens).
>>
>> Thanks
>> --Madhu
>>
>> ________________________________________
>> From: kepler-users-bounces at kepler-project.org
>> [kepler-users-bounces at kepler-project.org] On Behalf Of Corinna Gries
>> [cgries at wisc.edu]
>> Sent: Thursday, June 10, 2010 11:31 AM
>> To: Kepler User
>> Subject: [kepler-users] string splitter
>>
>> Hi again,
>>
>> when I am running this line of data:
>> 6/19/2009,CEW,,6/10/2009,6,1,1000,52.5,31,1,1,1.017410714,0.625589286,1.3125,,
>>
>>
>> through the string splitter, splitting it on ',' it omits the last empty
>> string, i.e. does not pass an empty string. Trying to read the array
>> element in position 14 throws an error rather than returning an empty
>> string, which is what I had expected.
>>
>> I can work around it by just adding something to end of the line but is
>> that an otherwise meaningful behavior?
>>
>> Corinna
>> _______________________________________________
>> Kepler-users mailing list
>> Kepler-users at kepler-project.org
>> http://mercury.nceas.ucsb.edu/kepler/mailman/listinfo/kepler-users
>
>
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-- 
Christopher Brooks, PMP                       University of California
CHESS Executive Director                      US Mail: 337 Cory Hall
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