The DomainUsernamePasswordAuthenticationToken class

When a user authenticates, Spring Security submits an Authentication object to AuthenticationProvider with the information provided by the user. The current UsernamePasswordAuthentication object only contains a username and password field. Create a DomainUsernamePasswordAuthenticationToken object that contains a domain field, as shown in the following code snippet:

    //src/main/java/com/packtpub/springsecurity/authentication/
    DomainUsernamePasswordAuthenticationToken.java

    public final class DomainUsernamePasswordAuthenticationToken extends     
    UsernamePasswordAuthenticationToken {
            private final String domain;
            // used for attempting authentication
           public DomainUsernamePasswordAuthenticationToken(String
           principal, String credentials, String domain) {
              super(principal, credentials);
              this.domain = domain;
            } 
    // used for returning to Spring Security after being
    //authenticated
    public DomainUsernamePasswordAuthenticationToken(CalendarUser
       principal, String credentials, String domain,
       Collection<? extends GrantedAuthority> authorities) {
         super(principal, credentials, authorities);
         this.domain = domain;
       }
    public String getDomain() {
       return domain;
    }
    }