Replace the raw data or file associated with a DataObject

A DataObject is a container for data that can be either an R raw object or a file on local disk. The replaceMember method can be used to update the date that a DataObject contains, for a DataObject that is a member of a DataPackage, substituting a new file or raw object in the specified DataObject.

Usage

replaceMember(x, do, ...)

# S4 method for class 'DataPackage'
replaceMember(
  x,
  do,
  replacement,
  formatId = NA_character_,
  mediaType = NA_character_,
  mediaTypeProperty = NA_character_,
  newId = NA_character_,
  ...
)

Arguments

x

A DataPackage instance

do

A DataObject instance

...

(Not yet used)

replacement

A raw object or character (for filename) that will replace the current value in the DataObject do.

formatId

A value of type "character", the DataONE object format for the object.

mediaType

A value of type "character", the IANA Media Type (aka MIME-Type) of the object, e.g. "text/csv".

mediaTypeProperty

A value of type "list" of "character", IANA Media Type properties for the "mediaType" argument.

newId

A value of type "character" which will replace the identifier for this DataObject.

Details

The data that is replacing the existing DataObject data may be of a different format or type than the existing data. Because the data type and format may change, the system metadata that describes the data can be updated as well. The replaceMember method will update the SystemMetadata size, checksum values automatically, but does not update the formatId, mediaType, mediaTypeProperty unless requested, so these should be specified in the call to replaceMember if necessary. If the newId argument is used, the specified new identifier will be assigned to the object, otherwise one will be generated if necessary. This new identifier will be used if the DataPackage is uploaded to DataONE, and this object is updating an existing object in DataONE.

See also

DataPackage-class

Examples

# Create a DataObject and add it to the DataPackage
dp <- new("DataPackage")
doIn <- new("DataObject", format="text/csv", 
            filename=system.file("./extdata/pkg-example/binary.csv", package="datapack"))
dp <- addMember(dp, doIn)

# Use the zipped version of the file instead by updating the DataObject
dp <- replaceMember(dp, doIn, 
          replacement=system.file("./extdata/pkg-example/binary.csv.zip", 
          package="datapack"),
                    formatId="application/zip")