-#' ArvadosFile Class
-#'
-#' @details
-#' Todo: Update description
-#' Subcollection
-#'
-#' @export ArvadosFile
-#' @exportClass ArvadosFile
-ArvadosFile <- setRefClass(
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+source("./R/util.R")
+
+#' ArvadosFile
+#'
+#' ArvadosFile class represents a file inside Arvados collection.
+#'
+#' @section Usage:
+#' \preformatted{file = ArvadosFile$new(name)}
+#'
+#' @section Arguments:
+#' \describe{
+#' \item{name}{Name of the file.}
+#' }
+#'
+#' @section Methods:
+#' \describe{
+#' \item{getName()}{Returns name of the file.}
+#' \item{getRelativePath()}{Returns file path relative to the root.}
+#' \item{read(contentType = "raw", offset = 0, length = 0)}{Read file content.}
+#' \item{write(content, contentType = "text/html")}{Write to file (override current content of the file).}
+#' \item{connection(rw)}{Get connection opened in "read" or "write" mode.}
+#' \item{flush()}{Write connections content to a file (override current content of the file).}
+#' \item{remove(name)}{Removes ArvadosFile or Subcollection specified by name from the subcollection.}
+#' \item{getSizeInBytes()}{Returns file size in bytes.}
+#' \item{move(newLocation)}{Moves file to a new location inside collection.}
+#' }
+#'
+#' @name ArvadosFile
+#' @examples
+#' \dontrun{
+#' myFile <- ArvadosFile$new("myFile")
+#'
+#' myFile$write("This is new file content")
+#' fileContent <- myFile$read()
+#' fileContent <- myFile$read("text")
+#' fileContent <- myFile$read("raw", offset = 8, length = 4)
+#'
+#' #Write a table:
+#' arvConnection <- myFile$connection("w")
+#' write.table(mytable, arvConnection)
+#' arvadosFile$flush()
+#'
+#' #Read a table:
+#' arvConnection <- myFile$connection("r")
+#' mytable <- read.table(arvConnection)
+#'
+#' myFile$move("newFolder/myFile")
+#' }
+NULL
+
+#' @export
+ArvadosFile <- R6::R6Class(
+
"ArvadosFile",
- fields = list(
- name = "character"
+
+ public = list(
+
+ initialize = function(name)
+ {
+ if(name == "")
+ stop("Invalid name.")
+
+ private$name <- name
+ },
+
+ getName = function() private$name,
+
+ getFileListing = function(fullpath = TRUE)
+ {
+ self$getName()
+ },
+
+ getSizeInBytes = function()
+ {
+ if(is.null(private$collection))
+ return(0)
+
+ REST <- private$collection$getRESTService()
+
+ fileSize <- REST$getResourceSize(self$getRelativePath(),
+ private$collection$uuid)
+
+ fileSize
+ },
+
+ get = function(fileLikeObjectName)
+ {
+ return(NULL)
+ },
+
+ getFirst = function()
+ {
+ return(NULL)
+ },
+
+ getCollection = function() private$collection,
+
+ setCollection = function(collection)
+ {
+ private$collection <- collection
+ },
+
+ getRelativePath = function()
+ {
+ relativePath <- c(private$name)
+ parent <- private$parent
+
+ while(!is.null(parent))
+ {
+ relativePath <- c(parent$getName(), relativePath)
+ parent <- parent$getParent()
+ }
+
+ relativePath <- relativePath[relativePath != ""]
+ paste0(relativePath, collapse = "/")
+ },
+
+ getParent = function() private$parent,
+
+ setParent = function(newParent) private$parent <- newParent,
+
+ read = function(contentType = "raw", offset = 0, length = 0)
+ {
+ if(is.null(private$collection))
+ stop("ArvadosFile doesn't belong to any collection.")
+
+ if(offset < 0 || length < 0)
+ stop("Offset and length must be positive values.")
+
+ REST <- private$collection$getRESTService()
+
+ fileContent <- REST$read(self$getRelativePath(),
+ private$collection$uuid,
+ contentType, offset, length)
+ fileContent
+ },
+
+ connection = function(rw)
+ {
+ if (rw == "r" || rw == "rb")
+ {
+ REST <- private$collection$getRESTService()
+ return(REST$getConnection(self$getRelativePath(),
+ private$collection$uuid,
+ rw))
+ }
+ else if (rw == "w")
+ {
+ private$buffer <- textConnection(NULL, "w")
+
+ return(private$buffer)
+ }
+ },
+
+ flush = function()
+ {
+ v <- textConnectionValue(private$buffer)
+ close(private$buffer)
+ self$write(paste(v, collapse='\n'))
+ },
+
+ write = function(content, contentType = "text/html")
+ {
+ if(is.null(private$collection))
+ stop("ArvadosFile doesn't belong to any collection.")
+
+ REST <- private$collection$getRESTService()
+
+ writeResult <- REST$write(self$getRelativePath(),
+ private$collection$uuid,
+ content, contentType)
+ writeResult
+ },
+
+ move = function(newLocation)
+ {
+ if(is.null(private$collection))
+ stop("ArvadosFile doesn't belong to any collection")
+
+ newLocation <- trimFromEnd(newLocation, "/")
+ nameAndPath <- splitToPathAndName(newLocation)
+
+ newParent <- private$collection$get(nameAndPath$path)
+
+ if(is.null(newParent))
+ {
+ stop("Unable to get destination subcollection")
+ }
+
+ childWithSameName <- newParent$get(nameAndPath$name)
+
+ if(!is.null(childWithSameName))
+ stop("Destination already contains content with same name.")
+
+ REST <- private$collection$getRESTService()
+ REST$move(self$getRelativePath(),
+ paste0(newParent$getRelativePath(), "/", nameAndPath$name),
+ private$collection$uuid)
+
+ private$dettachFromCurrentParent()
+ private$attachToNewParent(newParent)
+
+ private$name <- nameAndPath$name
+
+ "Content moved successfully."
+ }
),
- methods = list(
- initialize = function(subcollectionName)
+
+ private = list(
+
+ name = NULL,
+ size = NULL,
+ parent = NULL,
+ collection = NULL,
+ buffer = NULL,
+
+ attachToNewParent = function(newParent)
+ {
+ #Note: We temporary set parents collection to NULL. This will ensure that
+ # add method doesn't post file on REST.
+ parentsCollection <- newParent$getCollection()
+ newParent$setCollection(NULL, setRecursively = FALSE)
+
+ newParent$add(self)
+
+ newParent$setCollection(parentsCollection, setRecursively = FALSE)
+
+ private$parent <- newParent
+ },
+
+ dettachFromCurrentParent = function()
{
- name <<- subcollectionName
+ #Note: We temporary set parents collection to NULL. This will ensure that
+ # remove method doesn't remove this subcollection from REST.
+ parent <- private$parent
+ parentsCollection <- parent$getCollection()
+ parent$setCollection(NULL, setRecursively = FALSE)
+
+ parent$remove(private$name)
+
+ parent$setCollection(parentsCollection, setRecursively = FALSE)
}
- )
+ ),
+
+ cloneable = FALSE
)
+
+#' print.ArvadosFile
+#'
+#' Custom print function for ArvadosFile class
+#'
+#' @param x Instance of ArvadosFile class
+#' @param ... Optional arguments.
+#' @export
+print.ArvadosFile = function(x, ...)
+{
+ collection <- NULL
+ relativePath <- x$getRelativePath()
+
+ if(!is.null(x$getCollection()))
+ {
+ collection <- x$getCollection()$uuid
+ relativePath <- paste0("/", relativePath)
+ }
+
+ cat(paste0("Type: ", "\"", "ArvadosFile", "\""), sep = "\n")
+ cat(paste0("Name: ", "\"", x$getName(), "\""), sep = "\n")
+ cat(paste0("Relative path: ", "\"", relativePath, "\""), sep = "\n")
+ cat(paste0("Collection: ", "\"", collection, "\""), sep = "\n")
+}
projects / arvados.git / blobdiff