class.ilDataCollectionFormulaField.php

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<?php

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

require_once('./Modules/DataCollection/classes/class.ilDataCollectionRecordField.php');
require_once('class.ilDclStack.php');
require_once('class.ilDclExpressionParser.php');
require_once('class.ilDclTokenizer.php');

class ilDataCollectionFormulaField extends ilDataCollectionRecordField {

        protected $expression = '';
        protected $field_properties = array();
        protected $parsed_value = '';


        public function __construct(ilDataCollectionRecord $record, ilDataCollectionField $field) {
                parent::__construct($record, $field);
                $this->field_properties = $field->getProperties();
                $this->expression = $this->field_properties[ilDataCollectionField::PROPERTYID_FORMULA_EXPRESSION];
        }


        protected function loadValue() {
                return NULL;
        }


        public function setValue($value) {
                unset($value);
        }


        public function doUpdate() {
                return NULL;
        }


        public function doRead() {
                return NULL;
        }


        public function delete() {
                return NULL;
        }


        public function getFormInput() {
                return $this->parse();
        }


        public function getHTML() {
                return $this->parse();
        }


        public function getExportValue() {
                return $this->parse();
        }


        public function getValue() {
                return $this->parse();
        }


        protected function parse() {
                if (!$this->parsed_value AND $this->expression) {
                        $parser = new ilDclExpressionParser($this->expression, $this->record, $this->field);
                        try {
                                $this->parsed_value = $parser->parse();
                        } catch (ilException $e) {
                                return $this->lng->txt('dcl_error_parsing_expression') . ' (' . $e->getMessage() . ')';
                        }
                }

                return $this->parsed_value;
        }
}