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#
# Bdpar provide a tool to easily build customized data flows to pre-process
# large volumes of information from different sources. To this end, bdpar allows
# to (i) easily use and create new functionalities and (ii) develop new data
# source extractors according to the user needs. Additionally, the package
# provides by default a predefined data flow to extract and preprocess the most
# relevant information (tokens, dates, ... ) from some textual sources (SMS,
# email, YouTube comments).
#
# Copyright (C) 2020-2022 Sing Group (University of Vigo)
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>
#' @title Class to get the file's extension field of an Instance
#'
#' @description Gets the extension of a file. Creates the \strong{extension}
#' property which indicates extension of the file.
#'
#' @section Note:
#' \code{\link{StoreFileExtPipe}} will automatically invalidate the
#' \code{\link{Instance}} if it is not able to find the
#' extension from the path field.
#'
#' @section Inherit:
#' This class inherits from \code{\link{GenericPipe}} and implements the
#' \code{pipe} abstract function.
#'
#' @seealso \code{\link{AbbreviationPipe}}, \code{\link{ContractionPipe}},
#' \code{\link{File2Pipe}}, \code{\link{FindEmojiPipe}},
#' \code{\link{FindEmoticonPipe}}, \code{\link{FindHashtagPipe}},
#' \code{\link{FindUrlPipe}}, \code{\link{FindUserNamePipe}},
#' \code{\link{GuessDatePipe}}, \code{\link{GuessLanguagePipe}},
#' \code{\link{Instance}}, \code{\link{InterjectionPipe}},
#' \code{\link{MeasureLengthPipe}}, \code{\link{GenericPipe}},
#' \code{\link{ResourceHandler}}, \code{\link{SlangPipe}},
#' \code{\link{StopWordPipe}}, \code{\link{TargetAssigningPipe}},
#' \code{\link{TeeCSVPipe}}, \code{\link{ToLowerCasePipe}}
#'
#' @keywords NULL
#'
#' @import R6
#' @export StoreFileExtPipe
StoreFileExtPipe <- R6Class(
"StoreFileExtPipe",
inherit = GenericPipe,
public = list(
#'
#' @description Creates a \code{\link{StoreFileExtPipe}} object.
#'
#' @param propertyName A \code{\link{character}} value. Name of the property
#' associated with the \code{\link{GenericPipe}}.
#' @param alwaysBeforeDeps A \code{\link{list}} value. The dependencies
#' alwaysBefore (\code{\link{GenericPipe}s} that must be executed before
#' this one).
#' @param notAfterDeps A \code{\link{list}} value. The dependencies
#' notAfter (\code{\link{GenericPipe}s} that cannot be executed after
#' this one).
#'
initialize = function(propertyName = "extension",
alwaysBeforeDeps = list(),
notAfterDeps = list()) {
if (!"character" %in% class(propertyName)) {
bdpar.log(message = paste0("Checking the type of the 'propertyName' variable: ",
class(propertyName)),
level = "FATAL",
className = class(self)[1],
methodName = "initialize")
}
if (!"list" %in% class(alwaysBeforeDeps)) {
bdpar.log(message = paste0("Checking the type of the 'alwaysBeforeDeps' variable: ",
class(alwaysBeforeDeps)),
level = "FATAL",
className = class(self)[1],
methodName = "initialize")
}
if (!"list" %in% class(notAfterDeps)) {
bdpar.log(message = paste0("Checking the type of the 'notAfterDeps' variable: ",
class(notAfterDeps)),
level = "FATAL",
className = class(self)[1],
methodName = "initialize")
}
super$initialize(propertyName, alwaysBeforeDeps, notAfterDeps)
},
#'
#' @description Preprocesses the \code{\link{Instance}} to obtain the
#' extension of \code{\link{Instance}}.
#'
#' @param instance A \code{\link{Instance}} value. The \code{\link{Instance}}
#' to preprocess.
#'
#' @return The \code{\link{Instance}} with the modifications that have
#' occurred in the pipe.
#'
pipe = function(instance) {
if (!"Instance" %in% class(instance)) {
bdpar.log(message = paste0("Checking the type of the 'instance' variable: ",
class(instance)),
level = "FATAL",
className = class(self)[1],
methodName = "pipe")
}
instance$addProperties(self$obtainExtension(instance$getPath()),
super$getPropertyName())
if (instance$getSpecificProperty("extension") %in% "") {
message <- paste0("The file: ", instance$getPath(), " has not an extension")
instance$addProperties(message, "reasonToInvalidate")
bdpar.log(message = message,
level = "WARN",
className = class(self)[1],
methodName = "pipe")
instance$invalidate()
return(instance)
}
instance
},
#'
#' @description Gets of extension of the path.
#'
#' @param path A \code{\link{character}} value. The path of the file to get
#' the extension.
#'
#' @return Extension of the path.
#'
#' @import tools
#'
obtainExtension = function(path) {
if (!"character" %in% class(path)) {
bdpar.log(message = paste0("Checking the type of the 'path' variable: ",
class(path)),
level = "FATAL",
className = class(self)[1],
methodName = "obtainExtension")
}
file_ext(path)
}
)
)
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