question: adds a file listener that can react to change events concode_field_sep boolean active concode_elem_sep long sleepTime concode_elem_sep List<DirectoryWatcher.FileChangeListener> listeners concode_field_sep void fireOnNew concode_elem_sep void setActive concode_elem_sep void addWatchDirectory concode_elem_sep void fireOnChange concode_elem_sep void removeListener concode_elem_sep boolean isValidFileToMonitor concode_elem_sep void setSleepTime concode_elem_sep void addWatchFile concode_elem_sep boolean isValidDirectoryToMonitor concode_elem_sep String getFilenameExtension
target: void function ( DirectoryWatcher . FileChangeListener arg0 ) { listeners . add ( arg0 ) ; }