Groovy: editing a file - groovy

Question

I have a sample file like the following:
CREATE GLOBAL TEMPORARY TABLE tt_temp_user_11
(
asdfa
)
CREATE GLOBAL TEMPORARY TABLE tt_temp_user_11
(
asdfas
)
some other text in file
I want to convert this file into following:
CREATE GLOBAL TEMPORARY TABLE 1
(
asdfa
)
CREATE GLOBAL TEMPORARY TABLE 2
(
asdfas
)
some other text in file
So basically every TEMPORARY TABLE occurrence will have number appended to it.
So far I have the following groovy script:
int i = 0
new File ("C:\\Not_Modified").eachFile{file ->
println "File name: ${file.name}"
new File ("C:\\Not_Modified\\"+file.name).eachLine {line ->
if (line.indexOf("TEMPORARY TABLE")>0)
{
i++
}
}
println "There are ${i} occurences of TEMPORARY TABLE"
}
How can I change the text in the file? should I be writing to a different file?
btw, I have directory in my script because I will be working on lot of these type of files in a directory.
I should have opted perl for this task but wanted to give groovy a try.

Answer 1

I wrote a little function that works kind of like File.eachLine{} works but allows editing.
You can use it like this:
def n=1
modifyFile("filename"){
if(it.startsWith("CREATE GLOBAL TEMPORARY TABLE"))
return "CREATE GLOBAL TEMPORARY TABLE " + n++
return it // Re-inserts unmodified line"
}
This is pretty easy to code--whatever is returned from the closure is written out to the new file. If you want a different file, provide two filenames.
/**
* This will completely re-write a file, be careful.
*
* Simple Usage:
*
* modifyFile("C:\whatever\whatever.txt") {
* if(it.contains("soil"))
* return null // remove dirty word
* else
* return it
* }
*
* The closure must return the line passed in to keep it in the file or alter it, any alteration
* will be written in it's place.
*
* To delete an entire line instead of changing it, return null
* To add more lines after a given line return: it + "\n" + moreLines
*
* Notice that you add "\n" before your additional lines and not after the last
* one because this method will normally add one for you.
*/
def modifyFile(srcFile, Closure c) {
modifyFile(srcFile, srcFile, c)
}
def modifyFile(srcFile, destFile, Closure c={println it;return it}) {
StringBuffer ret=new StringBuffer();
File src=new File(srcFile)
File dest=new File(destFile)
src.withReader{reader->
reader.eachLine{
def line=c(it)
if(line != null) {
ret.append(line)
ret.append("\n")
}
}
}
dest.delete()
dest.write(ret.toString())
}
}

Answer 2

I'm think you should write to different file, it's a good practice.
Put something like line below inside your if {} (instead of i++)
line = line.replaceFirst(/^(create temporary table) (.*)/, "\$1 table${++i}")
and then, outside of your if write line variable into outfile
BTW i'm think you better use ==~ in your if instead of indexOf