Groovy Goodness: Working on Files or Directories (or Both) with FileType

Working with files in Groovy is very easy. We have a lot of useful methods available in the File class. For example we can run a Closure for each file that can be found in a directory with the eachFile() method. Since Groovy 1.7.1 we can define if we only want to process the directories, files or both. To do this we must pass a FileType constant to the method. See the following example code:

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00.import groovy.io.FileType
01. 
02.// First create sample dirs and files.
03.(1..3).each {
04.new File("dir$it").mkdir()
05.}
06.(1..3).each {
07.def file = new File("file$it")
08.file << "Sample content for ${file.absolutePath}"
09.}
10. 
11.def currentDir = new File('.')
12.def dirs = []
13.currentDir.eachFile FileType.DIRECTORIES, {
14.dirs << it.name
15.}
16.assert 'dir1,dir2,dir3' == dirs.join(',')
17. 
18.def files = []
19.currentDir.eachFile(FileType.FILES) {
20.files << it.name
21.}
22.assert 'file1,file2,file3' == files.join(',')
23. 
24.def found = []
25.currentDir.eachFileMatch(FileType.ANY, ~/.*2/) {
26.found << it.name
27.}
28. 
29.assert 'dir2,file2' == found.join(',')