Brian's Waste of Time

Thu, 25 Mar 2004

Closure Recursion in Groovy

Wrote a fun little groovy script earlier today to copy IMAP messages to Exchange. JavaMail and Groovy made this pretty simple, so simple I had to do a bit of gold plating. Oh well =)

The fun part is in this snippet:

traverse = { folder, operation |
    traverse_subfolders = { folder, operation |
        recur = this
        folder.list().each { 
            recur(it, operation)
    traverse_subfolders(folder, operation)

Groovy suffers from a cannot-call-closure-by-name-from-itself problem. Because the closure is a first class object though, you have access to it via this, so you can, in fact, recur on your closure.

0 writebacks [/src/groovy] permanent link