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/**
 * Authenticates where the presented password is the integer length of the
 * username.
 */
public class UsernameLengthAuthnHandler
    implements AuthenticationHandler {


    public boolean authenticate(Credentials credentials) throws AuthenticationException {
        
        UsernamePasswordCredentials upCredentials = 
            (UsernamePasswordCredentials) credentials;
        
        String username = upCredentials.getUsername();
        String password = upCredentials.getPassword();
        
        String correctPassword = 
            Integer.toString(username.length());
        
        return correctPassword.equals(password);
    }

    public boolean supports(Credentials credentials) {
        // we support credentials that bear usernames and passwords
        return credentials instanceof UsernamePasswordCredentials;
    }

}