<?php

class SurveyRDFWriter 
{
    protected $model;

    protected $resourceSurvey;
    protected $surveyUID;

    protected $filePath;

    public function __construct($surveyUID)
    {
        // Create empty MemModel
        $factory = new ModelFactory();
        $this->model = $factory->getDefaultModel();

        $this->surveyUID = $surveyUID;	
        $this->filePath = 'data/surveys/';
        if (!is_dir($this->filePath))
            mkdir($this->filePath);	
    }	

    public function saveSurvey()
    {	
        $this->model->saveAs($this->filePath.'survey_'.$this->surveyUID.'.rdf','rdf');
    }

    public function createSurvey($sTitle, $sDescription)
    {		
        $this->resourceSurvey = new Resource(SURVEY.'/'.$this->surveyUID);

        $resourceSurveyType = new Resource(SURVEY);
        $predicateRType = new Resource(RTYPE);
        $this->model->add(new Statement($this->resourceSurvey,$predicateRType,$resourceSurveyType));

        $literalSurveyID = new Literal($this->surveyUID);
        $predicateUniqueID = new Resource(UID);
        $this->model->add(new Statement($this->resourceSurvey,$predicateUniqueID,$literalSurveyID));

        $predicateTitle = new Resource(TITLE);		
        $surveyTitle = new Literal($sTitle);
        $this->model->add(new Statement($this->resourceSurvey,$predicateTitle,$surveyTitle));		

        $predicateDescription = new Resource(DESCRIPTION);
        $surveyDescription = new Literal($sDescription);
        $this->model->add(new Statement($this->resourceSurvey,$predicateDescription,$surveyDescription));		
    }

    public function setUserData($uID)
    {				
        $userID = new Literal($uID);

        $predicateCreator = new Resource(CREATOR);
        $this->model->add(new Statement($this->resourceSurvey,$predicateCreator,$userID));
    }

    public function addQuestion($qID)
    {		
        $questionID = new Literal($qID);
        $predicateQuestion = new Resource(HAS_QUESTION);
        $this->model->add(new Statement($this->resourceSurvey,$predicateQuestion,$questionID));
    }
}

?>