source: Dev/trunk/classes/SurveyDatabaseInterface.php @ 26

<?php
// Survey class as intermediate for storing data from the site to the RDF database 
require 'rdfConstants.php';

// Include RAP Library to write RDF files
define("RDFAPI_INCLUDE_DIR", "rdfapi/");
include(RDFAPI_INCLUDE_DIR . "RDFAPI.php");



class SurveyDatabaseInterface
{       
    protected static $instance;
        
        protected $surveyRDFWriter;
        protected $surveyRDFReader;
 

    protected function __construct()
    {
        //protected to prevent direct instantiation
                $surveyUID = md5( uniqid(rand(), true) );
                
                $this->surveyRDFWriter = new SurveyRDFWriter($surveyUID);
                $this->surveyRDFReader = new SurveyRDFReader($surveyUID);
    }

        public static function getInstance() 
    { 
        if (!self::$instance) 
        { 
            self::$instance = new SurveyDatabaseInterface(); 
        } 

        return self::$instance; 
    }
        
        public function setSurveyInfo($survey)
        {
                $sTitle = $survey['surveyTitle'];
                $sDescription = $survey['surveyDescription'];
                
                $this->surveyRDFWriter->createSurvey($sTitle,$sDescription);
                
                $qNumber = 1;
                while (isset($survey['questionTitle'.$qNumber]))
                {
                        $qTitle = $survey['questionTitle'.$qNumber];
                        $qDescription = $survey['questionDescription'.$qNumber];
                        $qType = $survey['questionType'.$qNumber];
                        
                        $qAnswers = array();
                        $aNumber = 1;
                        while (isset($survey['q'.$qNumber.'ans'.$aNumber]))
                        {
                                $aArray = array();
                                $aArray['Title'] = $survey['q'.$qNumber.'ans'.$aNumber];
                                $aArray['Description'] = 'answerDescription'.$aNumber;
                                $qAnswers[] = $aArray;
                                
                                $aNumber++;
                        }
                        
                        $this->surveyRDFWriter->addQuestion($qTitle,$qDescription,$qType,$qAnswers);
                        
                        $qNumber++;
                }

                $this->surveyRDFWriter->saveSurvey();
        }
        
        public function getSurveyInfo()
        {
                $surveyInfo = array();
                
                $resultSurvey = $this->surveyRDFReader->getSurveyInfo();
                
                $surveyInfo['surveyTitle'] = substr($resultSurvey[0][0]['?title'],9,strlen($resultSurvey[0][0]['?title'])-11);
                $surveyInfo['surveyDescription'] = substr($resultSurvey[0][0]['?description'],9,strlen($resultSurvey[0][0]['?description'])-11);
                                                                        
                for($qNumber = 1;$qNumber<=sizeof($resultSurvey[1][0]);$qNumber++)
                {
                        $surveyInfo['questionTitle'.$qNumber] = substr($resultSurvey[1][0][$qNumber-1]['?questionTitle'],9,strlen($resultSurvey[1][0][$qNumber-1]['?questionTitle'])-11);
                        $surveyInfo['questionDescription'.$qNumber] = substr($resultSurvey[1][1][$qNumber-1]['?questionDescription'],9,strlen($resultSurvey[1][1][$qNumber-1]['?questionDescription'])-11);
                        $surveyInfo['questionType'.$qNumber] = substr($resultSurvey[1][2][$qNumber-1]['?questionType'],9,strlen($resultSurvey[1][2][$qNumber-1]['?questionType'])-11);
                        $questionID = substr($resultSurvey[1][3][$qNumber-1]['?questionID'],9,strlen($resultSurvey[1][3][$qNumber-1]['?questionID'])-11);
                        
                        $resultAnswers = $this->surveyRDFReader->readSurveyAnswers($questionID);
                                                
                        if ($resultAnswers != null)
                        {
                                for($aNumber = 1;$aNumber<=sizeof($resultAnswers);$aNumber++)
                                {
                                        $surveyInfo['q'.$qNumber.'ans'.$aNumber] = substr($resultAnswers[$aNumber-1]['?answerTitle'],9,strlen($resultAnswers[$aNumber-1]['?answerTitle'])-11);
                                }
                        }
                }
                                
                return $surveyInfo;
        }

}
?>