class.ilConditionHandlerInterface.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */


class ilConditionHandlerInterface
{
        var $ctrl = null;

        var $lng;
        var $tpl;
        var $tree;

        var $ch_obj;
        var $target_obj;
        var $client_obj;
        var $target_id;
        var $target_type;
        var $target_title;
        var $target_ref_id;

        var $automatic_validation = true;

        public function ilConditionHandlerInterface($gui_obj,$a_ref_id = null)
        {
                global $lng,$tpl,$tree,$ilCtrl;

                include_once "./Services/AccessControl/classes/class.ilConditionHandler.php";

                $this->ch_obj =& new ilConditionHandler();

                $this->ctrl =& $ilCtrl;
                $this->gui_obj =& $gui_obj;
                $this->lng =& $lng;
                $this->lng->loadLanguageModule('rbac');
                $this->tpl =& $tpl;
                $this->tree =& $tree;
                
                if($a_ref_id)
                {
                        $this->target_obj =& ilObjectFactory::getInstanceByRefId($a_ref_id);
                }
                else
                {
                        $this->target_obj =& $this->gui_obj->object;
                }

                // this only works for ilObject derived objects (other objects
                // should call set() methods manually   
                if (is_object($this->target_obj))
                {
                        $this->setTargetId($this->target_obj->getId());
                        $this->setTargetRefId($this->target_obj->getRefId());
                        $this->setTargetType($this->target_obj->getType());
                        $this->setTargetTitle($this->target_obj->getTitle());
                }
        }

        function setBackButtons($a_btn_arr)
        {
                $_SESSION['precon_btn'] = $a_btn_arr;
        }
        function getBackButtons()
        {
                return $_SESSION['precon_btn'] ? $_SESSION['precon_btn'] : array();
        }

        public function executeCommand()
        {
                global $ilErr, $ilAccess, $lng;
                
                if(!$ilAccess->checkAccess('write','',$this->getTargetRefId()))
                {
                        $ilErr->raiseError($lng->txt('permission_denied'),$ilErr->WARNING);
                }

                $next_class = $this->ctrl->getNextClass($this);
                $cmd = $this->ctrl->getCmd();

                switch ($next_class)
                {
                        default:
                                if (empty($cmd))
                                {
                                        $cmd = "view";
                                }
                                $this->$cmd();
                                break;
                }
        }

        function setAutomaticValidation($a_status)
        {
                $this->automatic_validation = $a_status;
        }
        function getAutomaticValidation()
        {
                return $this->automatic_validation;
        }

        
        function setTargetId($a_target_id)
        {
                $this->target_id = $a_target_id;
        }
        
        function getTargetId()
        {
                return $this->target_id;
        }

        function setTargetRefId($a_target_ref_id)
        {
                $this->target_ref_id = $a_target_ref_id;
        }
        
        function getTargetRefId()
        {
                return $this->target_ref_id;
        }

        function setTargetType($a_target_type)
        {
                $this->target_type = $a_target_type;
        }
        
        function getTargetType()
        {
                return $this->target_type;
        }

        function setTargetTitle($a_target_title)
        {
                $this->target_title = $a_target_title;
        }

        public function isTargetReferenced()
        {
                return $this->getTargetRefId() ? true : false;
        }
        
        function getTargetTitle()
        {
                return $this->target_title;
        }

        function chi_init(&$chi_target_obj,$a_ref_id = null)
        {
                echo 'deprecated';
                
                include_once "./Services/AccessControl/classes/class.ilConditionHandler.php";

                $this->ch_obj =& new ilConditionHandler();

                if($a_ref_id)
                {
                        $this->target_obj =& ilObjectFactory::getInstanceByRefId($a_ref_id);
                }
                else
                {
                        $this->target_obj =& $this->object;
                }

                return true;
        }

        protected function listConditions()
        {
                global $ilToolbar;

                $ilToolbar->addButton($this->lng->txt('add_condition'),$this->ctrl->getLinkTarget($this,'selector'));
                
                $this->tpl->addBlockFile('ADM_CONTENT','adm_content','tpl.list_conditions.html','Services/AccessControl');

                $optional_conditions = ilConditionHandler::getOptionalConditionsOfTarget(
                        $this->getTargetRefId(),
                        $this->getTargetId(),
                        $this->getTargetType()
                );
                if(count($optional_conditions))
                {
                        if(!$_REQUEST["list_mode"])
                        {
                                $_REQUEST["list_mode"] = "subset";
                        }
                }
                else if(!$_REQUEST["list_mode"])
                {
                        $_REQUEST["list_mode"] = "all";
                }
                $form = $this->showObligatoryForm($optional_conditions);
                $this->tpl->setVariable('TABLE_SETTINGS',$form->getHTML());

                include_once './Services/AccessControl/classes/class.ilConditionHandlerTableGUI.php';
                $table = new ilConditionHandlerTableGUI($this,'listConditions', ($_REQUEST["list_mode"] != "all"));
                $table->setConditions(
                        ilConditionHandler::_getConditionsOfTarget(
                                $this->getTargetRefId(),
                                $this->getTargetId(),
                                $this->getTargetType()
                        )
                );

                $this->tpl->setVariable('TABLE_CONDITIONS',$table->getHTML());
                $this->tpl->setContent($table->getHTML());
        }

        protected function saveObligatorySettings()
        {
                $form = $this->showObligatoryForm();
                if($form->checkInput())
                {
                        $old_mode = $form->getInput("old_list_mode");
                        switch($form->getInput("list_mode"))
                        {
                                case "all":
                                        if($old_mode != "all")
                                        {
                                                include_once './Services/AccessControl/classes/class.ilConditionHandler.php';
                                                $optional_conditions = ilConditionHandler::getOptionalConditionsOfTarget(
                                                        $this->getTargetRefId(),
                                                        $this->getTargetId(),
                                                        $this->getTargetType()
                                                );
                                                if(sizeof($optional_conditions) > 1)
                                                {
                                                        // Set all optional conditions to obligatory
                                                        foreach($optional_conditions as $item)
                                                        {
                                                                ilConditionHandler::updateObligatory($item["condition_id"], true);
                                                        }
                                                }
                                        }
                                        break;
                                
                                case "subset":
                                        $num_req = $form->getInput('required');
                                        if($old_mode != "subset")
                                        {
                                                $all_conditions = ilConditionHandler::_getConditionsOfTarget(
                                                        $this->getTargetRefId(),
                                                        $this->getTargetId(),
                                                        $this->getTargetType()
                                                );
                                                foreach($all_conditions as $item)
                                                {
                                                        ilConditionHandler::updateObligatory($item["condition_id"], false);
                                                }
                                                $num_req = 1;
                                        }
                                        ilConditionHandler::saveNumberOfRequiredTriggers(
                                                                        $this->getTargetRefId(),
                                                                        $this->getTargetId(),
                                                                        $num_req
                                                                );
                                        break;
                        }
                        
                        ilUtil::sendSuccess($this->lng->txt('settings_saved'),true);
                        $this->ctrl->redirect($this,'listConditions');
                }

                $form->setValuesByPost();
                ilUtil::sendFailure($this->lng->txt('err_check_input'));
                $this->tpl->setContent($form->getHTML());
        }
        
        protected function saveObligatoryList()
        {
                $all_conditions = ilConditionHandler::_getConditionsOfTarget(
                                                        $this->getTargetRefId(),
                                                        $this->getTargetId(),
                                                        $this->getTargetType()
                                                );
                
                if($_POST["obl"] && sizeof($_POST["obl"]) > sizeof($all_conditions)-2)
                {
                        ilUtil::sendFailure($this->lng->txt("rbac_precondition_minimum_optional"), true);
                        $this->ctrl->redirect($this,'listConditions');
                }
                
                foreach($all_conditions as $item)
                {
                        $status = false;
                        if($_POST["obl"] && in_array($item["condition_id"], $_POST["obl"]))
                        {
                                $status = true;
                        }
                        ilConditionHandler::updateObligatory($item["condition_id"], $status);
                }
                
                // re-calculate 
                ilConditionHandler::calculateRequiredTriggers(
                                $this->getTargetRefId(),
                                $this->getTargetId(),
                                $this->getTargetType(),
                                true
                        );
                
                ilUtil::sendSuccess($this->lng->txt('settings_saved'),true);
                $this->ctrl->redirect($this,'listConditions');
        }

        protected function showObligatoryForm($opt = array())
        {
                if(!$opt)
                {
                        $opt = ilConditionHandler::getOptionalConditionsOfTarget(
                                $this->getTargetRefId(),
                                $this->getTargetId(),
                                $this->getTargetType()
                        );
                }

                $all = ilConditionHandler::_getConditionsOfTarget($this->getTargetRefId(),$this->getTargetId());
                
                include_once './Services/Form/classes/class.ilPropertyFormGUI.php';
                $form = new ilPropertyFormGUI();
                $form->setFormAction($this->ctrl->getFormAction($this),'listConditions');
                $form->setTitle($this->lng->txt('precondition_obligatory_settings'));
                $form->addCommandButton('saveObligatorySettings', $this->lng->txt('save'));
                
                $mode = new ilRadioGroupInputGUI($this->lng->txt("rbac_precondition_mode"), "list_mode");
                $form->addItem($mode);
                $mode->setValue($_REQUEST["list_mode"]);
                
                $mall = new ilRadioOption($this->lng->txt("rbac_precondition_mode_all"), "all");
                $mall->setInfo($this->lng->txt("rbac_precondition_mode_all_info"));
                $mode->addOption($mall);
                
                $msubset = new ilRadioOption($this->lng->txt("rbac_precondition_mode_subset"), "subset");
                $msubset->setInfo($this->lng->txt("rbac_precondition_mode_subset_info"));
                $mode->addOption($msubset);

                $obl = new ilNumberInputGUI($this->lng->txt('precondition_num_obligatory'), 'required');
                $obl->setInfo($this->lng->txt('precondition_num_optional_info'));
                if(count($opt))
                {
                        $obligatory = ilConditionHandler::calculateRequiredTriggers(
                                $this->getTargetRefId(),
                                $this->getTargetId(),
                                $this->getTargetType()
                        );
                        $min = count($all) - count($opt) + 1;
                        $max = count($all) - 1;
                }
                else
                {
                        $obligatory = $min = $max = 1;
                }
                $obl->setValue($obligatory);
                $obl->setRequired(true);
                $obl->setSize(1);
                $obl->setMinValue($min);
                $obl->setMaxValue($max);
                $msubset->addSubItem($obl);
                
                $old_mode = new ilHiddenInputGUI("old_list_mode");
                $old_mode->setValue($_REQUEST["list_mode"]);
                $form->addItem($old_mode);

                return $form;
        }


        function edit()
        {
                global $ilObjDataCache;

                if(!$_GET['condition_id'])
                {
                        ilUtil::sendFailure("Missing id: condition_id");
                        $this->listConditions();
                        return false;
                }
                $condition = ilConditionHandler::_getCondition((int) $_GET['condition_id']);

                $this->tpl->addBlockfile('ADM_CONTENT','adm_content','tpl.condition_handler_edit_condition.html');
                $this->ctrl->setParameter($this,'condition_id',(int) $_GET['condition_id']);
                
                $this->initFormCondition($condition['trigger_ref_id'],(int) $_GET['condition_id'],'edit');
                $this->tpl->setVariable('CONDITION_TABLE',$this->form->getHTML());
        }

        function updateCondition()
        {
                global $ilObjDataCache;

                if(!$_GET['condition_id'])
                {
                        ilUtil::sendFailure("Missing id: condition_id");
                        $this->listConditions();
                        return false;
                }

                // Update condition
                include_once './Services/AccessControl/classes/class.ilConditionHandler.php';
                $condition_handler = new ilConditionHandler();

                $condition = ilConditionHandler::_getCondition((int) $_GET['condition_id']);
                $condition_handler->setOperator($_POST['operator']);
                $condition_handler->setObligatory((int) $_POST['obligatory']);
                $condition_handler->setTargetRefId($this->getTargetRefId());
                $condition_handler->setValue('');
                switch($this->getTargetType())
                {
                        case 'st':
                                $condition_handler->setReferenceHandlingType($_POST['ref_handling']);
                                break;
                        
                        default:
                                $condition_handler->setReferenceHandlingType(ilConditionHandler::UNIQUE_CONDITIONS);
                                break;  
                }
                $condition_handler->updateCondition($condition['id']);

                // Update relevant sco's
                if($condition['trigger_type'] == 'sahs')
                {
                        include_once 'Services/Tracking/classes/class.ilLPCollections.php';
                        $lp_collection = new ilLPCollections($condition['trigger_obj_id']);
                        $lp_collection->deleteAll();

                        $items = is_array($_POST['item_ids']) ? $_POST['item_ids'] : array();
                        foreach($items as $item_id)
                        {
                                $lp_collection->add($item_id);
                        }
                        
                        include_once("./Services/Tracking/classes/class.ilLPStatusWrapper.php");
                        ilLPStatusWrapper::_refreshStatus($condition['trigger_obj_id']);
                }

                ilUtil::sendSuccess($this->lng->txt('settings_saved'));
                $this->ctrl->redirect($this,'listConditions');
        }
        
        function askDelete()
        {               
                if(!count($_POST['conditions']))
                {
                        ilUtil::sendFailure($this->lng->txt('no_condition_selected'));
                        $this->listConditions();                        
                        return false;
                }

                // display confirmation message
                include_once("./Services/Utilities/classes/class.ilConfirmationGUI.php");
                $cgui = new ilConfirmationGUI();
                $cgui->setFormAction($this->ctrl->getFormAction($this));
                $cgui->setHeaderText($this->lng->txt("condition_delete_sure"));
                $cgui->setCancel($this->lng->txt("cancel"), "listConditions");
                $cgui->setConfirm($this->lng->txt("delete"), "delete");

                // list objects that should be deleted
                foreach($_POST['conditions'] as $condition_id)
                {
                        $condition = ilConditionHandler::_getCondition($condition_id);
                        $title = ilObject::_lookupTitle($condition['trigger_obj_id']);                  
                        $cgui->addItem("conditions[]", $condition_id, $title);
                }

                $this->tpl->setContent($cgui->getHTML());
        }
                

        function delete()
        {
                if(!count($_POST['conditions']))
                {
                        ilUtil::sendFailure($this->lng->txt('no_condition_selected'));
                        $this->listConditions();
                        return true;
                }

                foreach($_POST['conditions'] as $condition_id)
                {
                        $this->ch_obj->deleteCondition($condition_id);
                }
                ilUtil::sendSuccess($this->lng->txt('condition_deleted'),true);
                $this->ctrl->redirect($this,'listConditions');

                return true;
        }
        
        function selector()
        {
                global $tree;

                include_once ("./Services/AccessControl/classes/class.ilConditionSelector.php");

                $this->tpl->addBlockFile('ADM_CONTENT', "adm_content", "tpl.condition_selector.html");

                ilUtil::sendInfo($this->lng->txt("condition_select_object"));

                $exp = new ilConditionSelector($this->ctrl->getLinkTarget($this,'copySelector'));
                $exp->setExpand($_GET["condition_selector_expand"] ? $_GET["condition_selector_expand"] : $this->tree->readRootId());
                $exp->setExpandTarget($this->ctrl->getLinkTarget($this,'selector'));
                $exp->setTargetGet("ref_id");
                $exp->setRefId($this->getTargetRefId());

                if($this->getTargetRefId())
                {
                        $path = $tree->getPathId($this->getTargetRefId());
                        array_pop($path);
                        $exp->setForceOpenPath($path);
                }

                $exp->addFilter('crs');
                $exp->addFilter('tst');
                $exp->addFilter('sahs');
                $exp->addFilter('svy');

                $exp->setSelectableTypes($this->ch_obj->getTriggerTypes());
                $exp->setControlClass($this);
                // build html-output
                $exp->setOutput(0);

                $this->tpl->setCurrentBlock("adm_content");
                $this->tpl->setVariable("EXPLORER",$exp->getOutput());
                $this->tpl->parseCurrentBlock();
        }

        function add()
        {
                global $ilObjDataCache;

                if(!$_GET['source_id'])
                {
                        ilUtil::sendFailure("Missing id: condition_id");
                        $this->selector();
                        return false;
                }
                
                $this->initFormCondition((int) $_GET['source_id'],0,'add');
                $this->tpl->addBlockfile('ADM_CONTENT','adm_content','tpl.condition_handler_add.html');
                $this->tpl->setVariable('CONDITION_TABLE',$this->form->getHTML());              
        }


        function assign()
        {
                if(!isset($_GET['source_id']))
                {
                        echo "class.ilConditionHandlerInterface: no source_id given";

                        return false;
                }
                if(!$_POST['operator'])
                {
                        ilUtil::sendFailure($this->lng->txt('err_check_input'));
                        $this->add();
                        return false;
                }

                $this->ch_obj->setTargetRefId($this->getTargetRefId());
                $this->ch_obj->setTargetObjId($this->getTargetId());
                $this->ch_obj->setTargetType($this->getTargetType());
                
                switch($this->getTargetType())
                {
                        case 'st':
                                $this->ch_obj->setReferenceHandlingType($_POST['ref_handling']);
                                break;
                        
                        default:
                                $this->ch_obj->setReferenceHandlingType(ilConditionHandler::UNIQUE_CONDITIONS);
                                break;  
                }
                // this has to be changed, if non referenced trigger are implemted
                if(!$trigger_obj =& ilObjectFactory::getInstanceByRefId((int) $_GET['source_id'],false))
                {
                        echo 'ilConditionHandler: Trigger object does not exist';
                }
                $this->ch_obj->setTriggerRefId($trigger_obj->getRefId());
                $this->ch_obj->setTriggerObjId($trigger_obj->getId());
                $this->ch_obj->setTriggerType($trigger_obj->getType());
                $this->ch_obj->setOperator($_POST['operator']);
                $this->ch_obj->setObligatory((int) $_POST['obligatory']);
                $this->ch_obj->setValue('');

                // Save assigned sco's
                if($this->ch_obj->getTriggerType() == 'sahs')
                {
                        include_once 'Services/Tracking/classes/class.ilLPCollections.php';
                        $lp_collection = new ilLPCollections($this->ch_obj->getTriggerObjId());
                        $lp_collection->deleteAll();

                        $items = is_array($_POST['item_ids']) ? $_POST['item_ids'] : array();
                        foreach($items as $item_id)
                        {
                                $lp_collection->add($item_id);
                        }
                }

                $this->ch_obj->enableAutomaticValidation($this->getAutomaticValidation());
                if(!$this->ch_obj->storeCondition())
                {
                        ilUtil::sendFailure($this->ch_obj->getErrorMessage(),true);
                }
                else
                {
                        ilUtil::sendSuccess($this->lng->txt('added_new_condition'),true);
                }

                $this->ctrl->redirect($this,'listConditions');

                return true;
        }

        function chi_update()
        {
                #if(in_array('',$_POST['operator']))
                #{
                #       ilUtil::sendInfo($this->lng->txt('select_one_operator'));

                #       return false;
                #}
                foreach($this->__getConditionsOfTarget() as $condition)
                {
                        $this->ch_obj->setOperator($_POST['operator'][$condition["id"]]);
                        $this->ch_obj->setValue($_POST['value'][$condition["id"]]);
                        $this->ch_obj->updateCondition($condition['id']);

                }
                ilUtil::sendSuccess($this->lng->txt('conditions_updated'));
                
                $this->ctrl->returnToParent($this);

                return true;
        }
        function __getConditionsOfTarget()
        {
                include_once './Services/AccessControl/classes/class.ilConditionHandler.php';

                foreach(ilConditionHandler::_getConditionsOfTarget($this->getTargetRefId(),$this->getTargetId(), $this->getTargetType()) as $condition)
                {
                        if($condition['operator'] == 'not_member')
                        {
                                continue;
                        }
                        else
                        {
                                $cond[] = $condition;
                        }
                }
                return $cond ? $cond : array();
        }

        function __showButtons()
        {
                if(!$this->getBackButtons())
                {
                        return false;
                }

                $this->tpl->addBlockfile("BUTTONS", "buttons", "tpl.buttons.html");
                foreach($this->getBackButtons() as $name => $link)
                {
                        $this->tpl->setCurrentBlock("btn_cell");
                        $this->tpl->setVariable("BTN_LINK",$link);
                        $this->tpl->setVariable("BTN_TXT",$this->lng->txt($name));
                        $this->tpl->parseCurrentBlock();
                }
        }
        
        private function initFormCondition($a_source_id,$a_condition_id = 0,$a_mode = 'add')
        {
                $trigger_obj_id = ilObject::_lookupObjId($a_source_id);
                $trigger_type = ilObject::_lookupType($trigger_obj_id);
                
                $condition = ilConditionHandler::_getCondition($a_condition_id);
                
                if(is_object($this->form))
                {
                        return true;
                }
                include_once('Services/Form/classes/class.ilPropertyFormGUI.php');
                $this->form = new ilPropertyFormGUI();
                $this->ctrl->setParameter($this,'source_id',$a_source_id);
                $this->form->setFormAction($this->ctrl->getFormAction($this));
                
                $info_source = new ilNonEditableValueGUI($this->lng->txt("rbac_precondition_source"));
                $info_source->setValue(ilObject::_lookupTitle(ilObject::_lookupObjId($a_source_id)));
                $this->form->addItem($info_source);
                
                $info_target = new ilNonEditableValueGUI($this->lng->txt("rbac_precondition_target"));
                $info_target->setValue($this->getTargetTitle());
                $this->form->addItem($info_target);
                
                /* moved to list
                $obl = new ilCheckboxInputGUI($this->lng->txt('precondition_obligatory'), 'obligatory');
                $obl->setInfo($this->lng->txt('precondition_obligatory_info'));
                $obl->setValue(1);
                if($a_condition_id)
                {
                        $obl->setChecked($condition['obligatory']);
                }
                else
                {
                        $obl->setChecked(true);
                }
                $this->form->addItem($obl);
            */
                $obl = new ilHiddenInputGUI('obligatory');
                if($a_condition_id)
                {
                        $obl->setValue($condition['obligatory']);
                }
                else
                {
                        $obl->setValue(1);
                }
                $this->form->addItem($obl);
                
                $sel = new ilSelectInputGUI($this->lng->txt('condition'),'operator');
                include_once "./Services/AccessControl/classes/class.ilConditionHandler.php";
                $ch_obj = new ilConditionHandler();
                if($a_mode == 'add')
                {
                        $operators[0] = $this->lng->txt('select_one');
                }
                foreach($ch_obj->getOperatorsByTargetType($trigger_type) as $operator)
                {
                        $operators[$operator] = $this->lng->txt('condition_'.$operator);
                }
                $sel->setValue(isset($condition['operator']) ? $condition['operator'] : 0);
                $sel->setOptions($operators);
                $sel->setRequired(true);
                $this->form->addItem($sel);
                
                if(ilConditionHandler::_isReferenceHandlingOptional($this->getTargetType()))
                {
                        $rad_opt = new ilRadioGroupInputGUI($this->lng->txt('cond_ref_handling'),'ref_handling');
                        $rad_opt->setValue(isset($condition['ref_handling']) ? $condition['ref_handling'] : ilConditionHandler::SHARED_CONDITIONS);
                        
                        $opt2 = new ilRadioOption($this->lng->txt('cond_ref_shared'),ilConditionHandler::SHARED_CONDITIONS);
                        $rad_opt->addOption($opt2);

                        $opt1 = new ilRadioOption($this->lng->txt('cond_ref_unique'),ilConditionHandler::UNIQUE_CONDITIONS);
                        $rad_opt->addOption($opt1);
                        
                        $this->form->addItem($rad_opt);
                }
                
                // Additional settings for SCO's
                if($trigger_type == 'sahs')
                {
                        $this->lng->loadLanguageModule('trac');
                        include_once 'Services/Tracking/classes/class.ilLPCollections.php';
                        $lp_collections = new ilLPCollections($trigger_obj_id);
                        
                        $cus = new ilCustomInputGUI($this->lng->txt('trac_sahs_relevant_items'),'item_ids[]');
                        $cus->setRequired(true);

                        $tpl = new ilTemplate('tpl.condition_handler_sco_row.html',true,true);
                        $counter = 0;

                        foreach(ilLPCollections::_getPossibleSAHSItems($trigger_obj_id) as $item_id => $sahs_item)
                        {
                                $tpl->setCurrentBlock("sco_row");
                                $tpl->setVariable('SCO_ID',$item_id);
                                $tpl->setVariable('SCO_TITLE',$sahs_item['title']);
                                $tpl->setVariable('CHECKED',$lp_collections->isAssigned($item_id) ? 'checked="checked"' : '');
                                $tpl->parseCurrentBlock();
                                $counter++;
                        }
                        $tpl->setVariable('INFO_SEL',$this->lng->txt('trac_lp_determination_info_sco'));
                        $cus->setHTML($tpl->get());
                        $this->form->addItem($cus);
                }
                switch($a_mode)
                {
                        case 'edit':
                                $this->form->setTitleIcon(ilUtil::getImagePath('icon_'.$this->getTargetType().'.gif'));
                                $this->form->setTitle($this->lng->txt('precondition'));
                                $this->form->addCommandButton('updateCondition',$this->lng->txt('save'));
                                $this->form->addCommandButton('listConditions',$this->lng->txt('cancel'));
                                break;
                                
                        
                        case 'add':
                                $this->form->setTitleIcon(ilUtil::getImagePath('icon_'.$this->getTargetType().'.gif'));
                                $this->form->setTitle($this->lng->txt('add_condition'));
                                $this->form->addCommandButton('assign',$this->lng->txt('save'));
                                $this->form->addCommandButton('selector',$this->lng->txt('back'));
                                break;
                }
                return true;
        }
}
?>