default public boolean isAvailable() {
        return (getCurrentTimeRestriction().isAllowed() && getCurrentHostRestriction().isAllowed());
    }
Returns true if the current item is available based on the restrictions
for the given implementation of this interface, or false if the item is
not currently available. The default implementation checks current time
and host restrictions, allowing if both those restrictions allow access.

@return 
    true if the item is available, otherwise false.
extensions/guacamole-auth-restrict/src/main/java/org/apache/guacamole/auth/restrict/Restrictable.java