Groovy script to watch a directory for changes in JDK1.7

gistfile1.groovy

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.*;
 
// requires JDK 1.7.0+

Path tmpPath = Paths.get( args[0])
WatchService watchService = FileSystems.getDefault().newWatchService()

 //Watching the /tmp/nio/ directory
 //for MODIFY and DELETE operations
tmpPath.register(
        watchService,
        StandardWatchEventKinds.ENTRY_MODIFY,
        StandardWatchEventKinds.ENTRY_DELETE);

for ( ; ; ) {
    WatchKey key = watchService.take()

    //Poll all the events queued for the key
    for ( WatchEvent<?> event: key.pollEvents()){
        WatchEvent.Kind kind = event.kind()
        switch (kind.name()){
            case "ENTRY_MODIFY":
                System.out.println("Modified: "+event.context())
                break
            case "ENTRY_DELETE":
                System.out.println("Delete: "+event.context())
                break
        }
    }
    //reset is invoked to put the key back to ready state
    boolean valid = key.reset()
    //If the key is invalid, just exit.
    if ( !valid ) {
        break
    }
}