public ApplicationIdVerifier(Set<String> supportedApplicationIds){
  this.supportedApplicationIds=Collections.unmodifiableSet(new HashSet<String>(supportedApplicationIds));
}

public ApplicationIdVerifier ( Set < String > supportedApplicationIds ) { this . supportedApplicationIds = Collections . unmodifiableSet ( new HashSet < String > ( supportedApplicationIds ) ) ; }
constructs a new application id verifier with the provided set of supported application ids . if the set is empty , this verifier will support any application id ( including null values ) .
