setValue | R Documentation |
The 'setValue'
method is used to modify values stored in DataPackage members.
Each member in a DataPackage is a DataObject which is an R S4 object that contains a set of values (slots).
The available slots are described at help("DataObject-class")
.
setValue(x, ...) ## S4 method for signature 'DataPackage' setValue(x, name, value, identifiers = NA_character_, ...)
x |
A DataPackage instance |
... |
(Not yet used) |
name |
A DataObject slot name. |
value |
A new value to assign to the slot for selected DataPackage members. |
identifiers |
A list of identifiers of DataPackage members to update. |
If the parameter identifiers
is provided, then DataPackage members that
have identifiers specified in the list will be updated. If this parameter is not provided
then no members will be updated. To update all members in a package, specify the
value of identifiers=getIdentifiers(pkg)
where pkg
is the variable name
of the DataPackage to update. Note that this method can be used to update the
data
or filenane
slots, but it is instead recommended to us the
replaceMember
method to achieve this, as the replaceMember
method assists
in properly setting the related SystemMetadata values.
A DataPackage with possibly updated DataObjects.
DataPackage-class
# First create a package that we can modify. dp <- new("DataPackage") data <- charToRaw("1,2,3\n4,5,6") # The next statment sets the format type incorrectly as an example, so we can correct it later do <- new("DataObject", id="myNewId", dataobj=data, format="image/jpg", user="jsmith") dp <- addMember(dp, do) data <- charToRaw("7,8.9\n4,10,11") # This next statement also sets the format type incorrectly do <- new("DataObject", id="myNewId2", dataobj=data, format="image/jpg", user="jsmith") dp <- addMember(dp, do) # Change format types to correct value for both package members # Careful! Specifying 'identifiers=getIdentifiers(dp) will update all package members! dp <- setValue(dp, name="sysmeta@formatId", value="text/csv", identifiers=getIdentifiers(dp))
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