[kepler-users] string splitter

[Corinna Gries]

Hi Christopher,

thanks for clarifying.

Corinna

Christopher Brooks wrote:
> 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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>