this function appends two paths . it can be used to append a folderpath e.g. '' / my/path '' with another folderpath , or to append a folderpath with a filepath e.g. '' / my/path/myfile . raw '' . concode_field_sep PlaceHolder placeHolder concode_field_sep String getDirectorySeparator concode_elem_sep File getFolder concode_elem_sep boolean isFolderPath concode_elem_sep boolean isFilePath concode_elem_sep boolean isValidPath concode_elem_sep String getFileExtension concode_elem_sep String getFolderPath concode_elem_sep String trimFileExtensionAndDot concode_elem_sep String getFileName concode_elem_sep String cleanFilePath
String function ( String arg0 , String arg1 ) { if ( ! ( isFolderPath ( arg0 ) && isValidPath ( arg1 ) ) ) return null ; return arg0 + arg1 . substring ( 1 ) ; }