IMP_Ftree::init PHP Method

    public function init()
    {
        global $injector, $session;
        $access_folders = $injector->getInstance('IMP_Factory_Imap')->create()->access(IMP_Imap::ACCESS_FOLDERS);
        /* Reset class variables to the defaults. */
        $this->_accounts = $this->_elts = $this->_parent = array();
        $this->_changed = true;
        $old_track = isset($this->_eltdiff) && $this->_eltdiff->track;
        $this->_eltdiff = new IMP_Ftree_Eltdiff();
        /* Create a placeholder element to the base of the tree so we can
         * keep track of whether the base level needs to be sorted. */
        $this->_elts[self::BASE_ELT] = self::ELT_NEED_SORT | self::ELT_NONIMAP;
        $this->_parent[self::BASE_ELT] = array();
        $mask = IMP_Ftree_Account::INIT;
        if (!$access_folders || !$this->subscriptions || $session->get('imp', 'showunsub')) {
            $mask |= IMP_Ftree_Account::UNSUB;
            $this->setAttribute('subscribed', self::BASE_ELT, true);
        }
        /* Add base account. */
        $ob = $this->_accounts[self::BASE_ELT] = $access_folders ? new IMP_Ftree_Account_Imap() : new IMP_Ftree_Account_Inboxonly();
        array_map(array($this, '_insertElt'), $ob->getList(null, $mask));
        if ($access_folders) {
            /* Add remote servers. */
            $this->insert(iterator_to_array($injector->getInstance('IMP_Remote')));
            /* Add virtual folders to the tree. */
            $this->insert(iterator_to_array(IMP_Search_IteratorFilter::create(IMP_Search_IteratorFilter::VFOLDER)));
        }
        if ($old_track) {
            $this->eltdiff->track = true;
        }
    }