Resolves a Permission based on the given string representation.
@param permissionString the string representation of a permission.
@return A Permission object that can be used internally to determine a subject's permissions.
@throws InvalidPermissionStringException
if the permission string is not valid for this resolver.
Resolves a Permission based on the given string representation.
@param permissionString the string representation of a permission. @return A Permission object that can be used internally to determine a subject's permissions. @throws InvalidPermissionStringException if the permission string is not valid for this resolver.