public JAASMemoryLoginModule() 
{
    // --------------------------------------------------------- Public Methods
        log.debug("MEMORY LOGIN MODULE");
}

 public boolean abort() throws LoginException 
{
        // If our authentication was not successful, just return false
        if (principal == null)
            return (false);
        // Clean up if overall authentication failed
        if (committed)
            logout();
        else {
            committed = false;
            principal = null;
        }
        log.debug("Abort");
        return (true);
}

Phase 2 of authenticating a Subject when Phase 1 fails. This method is called if the LoginContext failed somewhere in the overall authentication chain.

 public boolean commit() throws LoginException 
{
        log.debug("commit " + principal);
        // If authentication was not successful, just return false
        if (principal == null)
            return (false);
        // Add our Principal to the Subject if needed
        if (!subject.getPrincipals().contains(principal))
            subject.getPrincipals().add(principal);
        committed = true;
        return (true);
}

Phase 2 of authenticating a Subject when Phase 1 was successful. This method is called if the LoginContext succeeded in the overall authentication chain.

 public SecurityConstraint[] findSecurityConstraints(Request request,
    Context context) 
{
        ArrayList< SecurityConstraint > results = null;
        // Are there any defined security constraints?
        SecurityConstraint constraints[] = context.findConstraints();
        if ((constraints == null) || (constraints.length == 0)) {
            if (context.getLogger().isDebugEnabled())
                context.getLogger().debug("  No applicable constraints defined");
            return (null);
        }
        // Check each defined security constraint
        String uri = request.getDecodedRequestURI();
        String contextPath = request.getContextPath();
        if (contextPath.length()  > 0)
            uri = uri.substring(contextPath.length());
        uri = RequestUtil.URLDecode(uri); // Before checking constraints
        String method = request.getMethod();
        for (int i = 0; i <  constraints.length; i++) {
            if (context.getLogger().isDebugEnabled())
                context.getLogger().debug("  Checking constraint '" + constraints[i] +
                    "' against " + method + " " + uri + " -- > " +
                    constraints[i].included(uri, method));
            if (constraints[i].included(uri, method)) {
                if(results == null) {
                    results = new ArrayList< SecurityConstraint >();
                }
                results.add(constraints[i]);
            }
        }
        // No applicable security constraint was found
        if (context.getLogger().isDebugEnabled())
            context.getLogger().debug("  No applicable constraint located");
        if(results == null)
            return null;
        SecurityConstraint [] array = new SecurityConstraint[results.size()];
        System.arraycopy(results.toArray(), 0, array, 0, array.length);
        return array;
}

Return the SecurityConstraints configured to guard the request URI for this request, or null if there is no such constraint.

 public  void initialize(Subject subject,
    CallbackHandler callbackHandler,
    Map sharedState,
    Map options) 
{
        log.debug("Init");
        // Save configuration values
        this.subject = subject;
        this.callbackHandler = callbackHandler;
        this.sharedState = sharedState;
        this.options = options;
        // Perform instance-specific initialization
        if (options.get("pathname") != null)
            this.pathname = (String) options.get("pathname");
        // Load our defined Principals
        load();
}

Initialize this LoginModule with the specified configuration information.

 protected  void load() 
{
        // Validate the existence of our configuration file
        File file = new File(pathname);
        if (!file.isAbsolute())
            file = new File(System.getProperty("catalina.base"), pathname);
        if (!file.exists() || !file.canRead()) {
            log.warn("Cannot load configuration file " + file.getAbsolutePath());
            return;
        }
        // Load the contents of our configuration file
        Digester digester = new Digester();
        digester.setValidating(false);
        digester.addRuleSet(new MemoryRuleSet());
        try {
            digester.push(this);
            digester.parse(file);
        } catch (Exception e) {
            log.warn("Error processing configuration file " +
                file.getAbsolutePath(), e);
            return;
        } finally {
            digester.reset();
        }
}

Load the contents of our configuration file.

 public boolean login() throws LoginException 
{
        // Set up our CallbackHandler requests
        if (callbackHandler == null)
            throw new LoginException("No CallbackHandler specified");
        Callback callbacks[] = new Callback[2];
        callbacks[0] = new NameCallback("Username: ");
        callbacks[1] = new PasswordCallback("Password: ", false);
        // Interact with the user to retrieve the username and password
        String username = null;
        String password = null;
        try {
            callbackHandler.handle(callbacks);
            username = ((NameCallback) callbacks[0]).getName();
            password =
                new String(((PasswordCallback) callbacks[1]).getPassword());
        } catch (IOException e) {
            throw new LoginException(e.toString());
        } catch (UnsupportedCallbackException e) {
            throw new LoginException(e.toString());
        }
        // Validate the username and password we have received
        principal = super.authenticate(username, password);
        log.debug("login " + username + " " + principal);
        // Report results based on success or failure
        if (principal != null) {
            return (true);
        } else {
            throw new
                FailedLoginException("Username or password is incorrect");
        }
}

Phase 1 of authenticating a Subject.

 public boolean logout() throws LoginException 
{
        subject.getPrincipals().remove(principal);
        committed = false;
        principal = null;
        return (true);
}

Log out this user.