CODEWITHSUNDEEP
groovyclosures
Marco
Marco

Reputation: 15929

How to get a return value from a recursive Groovy closure?

i seem to have written a recursive closure :) difficult enough but i am not struggling on how to get feedback from this closure. My written closure deletes a file recursively from the a starting point on the filesystem. I want to now how many files have been deleted!

How can is get feedback on how many files i have deleted? I tried with delegate etc but no luck so far..

    def deleteClosure
    deleteClosure = {
        it.eachDir( deleteClosure )
        it.eachFileMatch( ~".*123.jpg" ) {
            it.delete()
        }
    }

    deleteClosure(new File("/tmp/delete.me"))

Upvotes: 0

Views: 502

Answers (1)

John Wagenleitner
John Wagenleitner

Reputation: 11035

There is no need to write your own recursive closure code, Groovy adds an eachFileRecurse method to File objects. To get a count of files deleted you can always just increment a counter:

import groovy.io.*

def filesDeletedCount = 0
new File('/tmp/delete.me').eachFileRecurse(FileType.FILES) {
    if (it.name ==~ /.*123.jpg$/) {
        it.delete()
        filesDeletedCount++
    }
}

println "Files deleted: ${filesDeletedCount}"

Upvotes: 2

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