public void handle()

in tomee/apache-tomee/src/patch/java/org/apache/catalina/authenticator/jaspic/CallbackHandlerImpl.java [63:129]
54 lines of code
15 McCabe index (conditional complexity)

    public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {

        String name = null;
        Principal principal = null;
        Subject subject = null;
        String[] groups = null;

        if (callbacks != null) {
            // Need to combine data from multiple callbacks so use this to hold
            // the data
            // Process the callbacks
            for (Callback callback : callbacks) {
                if (callback instanceof CallerPrincipalCallback) {
                    CallerPrincipalCallback cpc = (CallerPrincipalCallback) callback;
                    name = cpc.getName();
                    principal = cpc.getPrincipal();
                    subject = cpc.getSubject();
                } else if (callback instanceof GroupPrincipalCallback) {
                    GroupPrincipalCallback gpc = (GroupPrincipalCallback) callback;
                    groups = gpc.getGroups();
                } else if (callback instanceof PasswordValidationCallback) {
                    if (container == null) {
                        log.warn(sm.getString("callbackHandlerImpl.containerMissing", callback.getClass().getName()));
                    } else if (container.getRealm() == null) {
                        log.warn(sm.getString("callbackHandlerImpl.realmMissing",
                                callback.getClass().getName(), container.getName()));
                    } else {
                        PasswordValidationCallback pvc = (PasswordValidationCallback) callback;
                        principal = container.getRealm().authenticate(pvc.getUsername(),
                                String.valueOf(pvc.getPassword()));
                        subject = pvc.getSubject();
                    }
                } else {
                    log.error(sm.getString("callbackHandlerImpl.jaspicCallbackMissing",
                            callback.getClass().getName()));
                }
            }

            // Create the GenericPrincipal
            Principal gp = getPrincipal(principal, name, groups);
            if (subject != null && gp != null) {

                // merge if needed
                String mergeName = gp.getName();
                List<String> mergeRoles = new ArrayList<>(Arrays.asList(((GenericPrincipal) gp).getRoles()));
                Principal mergePrincipal = ((GenericPrincipal) gp).getUserPrincipal();

                for (Object oPrincipal : subject.getPrivateCredentials()) {
                    if (!(oPrincipal instanceof GenericPrincipal)) {
                        continue;
                    }
                    final GenericPrincipal privateCredential = (GenericPrincipal) oPrincipal;
                    if (mergeName != null && mergeName.equals(privateCredential.getName())) {
                        mergeRoles.addAll(Arrays.asList(privateCredential.getRoles()));
                        subject.getPrivateCredentials().remove(oPrincipal);
                    }
                }

                subject.getPrivateCredentials().add(new GenericPrincipal(mergeName, null, mergeRoles, mergePrincipal));

                // may come from CallerPrincipalCallback and we need to being to get it from the Subject
                if (principal != null) {
                    subject.getPrincipals().add(principal);
                }
            }
        }
    }