stringAtLeastOneMemberOf Function Description

Description

This function takes in two parameters of type bag of string and returns true if there is at least one value in the first bag equal to at least one value in the second bag.

stringAtLeastOneMemberOf belongs to the ALFA function reference's Set functions category. It maps to the XACML function identifier urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of, takes 2 arguments and returns a value of type boolean.

Property Value
Category Set functions
# Arguments 2
Arguments
  • 2 bags of values of type string
Return Value boolean
Expressed As pre-fix
Representation ALFA short name
Allowed In Target false
ALFA Shorthand None
Commutative true

Example

/**
 * Driver's test: this rule checks that a user has at least one
 * qualification in order to drive a vehicle. At least one value of the 
 * userQualifications bag must be in the vehicleRequirements bag.
 * A user can have more qualifications though and access should still
 * be granted so long as the user has at least one requirement inside
 * userQualifications.
 */  
rule stringAtLeastOneMemberOfExample{
    permit
    condition stringAtLeastOneMemberOf(userQualifications, vehicleRequirements)
}

In this example, we revisit the "driver's license" check. In this case, though, it's sufficient for the user to have one requirement rather than all (as in the other driver examples). The rule will return Permit if there is at least one value in userQualifications equal to at least one value in vehicleRequirements.

See Also

Related Functions

Other functions in the Set functions category:

Browse the full ALFA function reference.