Thanks for the posts everyone. I need to use transformLine, though my SSCCE
did not suggest that, so filterLine will not work for me. Armin, Great idea
initialising to null. Works well. Only issue I think is that an extra blank
line is added to file2.txt. I then have to strip this as it later causes an
import error for me....

Tom.


Armin Ehrenfels wrote:
>
> Tom Corcoran schrieb:
>> I am wondering if there any way I am missing of skipping lines when using
>> transformLine?
>>
>> The last line in the closure is the line value written. Looking at a
>> SSCCE,
>> we have file1.txt with 4 lines:
>>
>> line1
>> line2
>> line11
>> line22
>>
>> I want to produce the file2.txt with 2 lines:
>>
>> line1
>> line11
>>
>> import java.util.regex.Matcher
>> import java.io.Reader
>> import java.io.Writer
>>
>> def file1 = /C:\Workspace\Test\file1.txt/
>> def file2 = /C:\Workspace\Test\file2.txt/
>> def writeLine
>> FileWriter writeFile = new FileWriter(file2)
>>           new FileReader(file1).transformLine(writeFile) { line ->
>>              Matcher m1 = line =~ /line1\d*/
>>              writeLine = ''
>>              if (m1.matches()) {
>>                 writeLine = line            
>>              }
>>              writeLine
>>           }
>>
>> will give:
>>
>> line1
>> <blank line>
>> line11
>> <blank line>
>>
>> I could then reprocess the field to remove blank lines, but it would be
>> great if there was a way of skipping lines with transformLine.
>>  
> In the closure, just initialize writeLine = null instead of writeLine =
> ''.
>

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