source: Dev/branches/jos-branch/classes/models/Respondent.php @ 212

<?php
// Survey database interface class as intermediate for storing data from the site to the RDF database 
require_once 'rdfConstants.php';
// Include RAP Library to write RDF files
include(RDFAPI_INCLUDE_DIR . "RDFAPI.php");

/**
 * Description of Respondent
 *
 * @author jkraaijeveld
 */

class Respondent extends ResearchToolObject {
        //Static Database-related information.
        private static $filename = 'data/users/respondents.rdf';

        public $name;
        public $password;

        /**
         * Constructor for a Respondent object
         * @param type $uid
         * @param type $name
         * @param type password
         */
        public function __construct($uid = null, $name = null, $password = null)
        {
        if(!isset($uid))
        {
            $uid = md5(uniqid(rand(), true));
        }
      
        $this->uid = $uid;
        $this->name = $name;
        $this->password = $password;
        }
    /**
         * function save()
         * Saves the current object into the database
     */
    public function save()
    {
                //Ensure the required folder exists.
                if(!is_dir('data/users/'))
                        mkdir('data/users/');

                $model = ResearchToolObject::load(Respondent::$filename);

        $resourceRespondent = new Resource(RESPONDENT . '/' . $this->uid);
        //Remove the old value stored with the given id
        $model->subtract($model->find($resourceRespondent, null, null));

                //Set the new values
        $resourceRespondentType = new Resource(RESPONDENT);
        $predicateRType = new Resource(RTYPE);
        $model->add(new Statement($resourceRespondent,$predicateRType,$resourceRespondentType));

        $literalRespondentID = new Literal($this->uid);
        $predicateUniqueID = new Resource(UID);
        $model->add(new Statement($resourceRespondent,$predicateUniqueID,$literalRespondentID));
        
        $literalRespondentName = new Literal($this->name);
        $predicateName = new Resource(NAME);
        $model->add(new Statement($resourceRespondent,$predicateName,$literalRespondentName));                  

        $literalPassword = new Literal($this->password);
        $predicatePassword = new Resource(PASSWORD);
        $model->add(new Statement($resourceRespondent,$predicatePassword,$literalPassword));
                $model->saveAs(Respondent::$filename, 'rdf');
                return true;
    }


        /**
         * static function get($arguments)
         * Gets the array of Respondent objects belonging to arguments supplied.
         * @param type $arguments : An array containing zero or more of the following keys:
                                                                'uid', 'name', 'password'
         */
    public static function get($arguments) {
                $model = ResearchToolObject::load(Respondent::$filename);
       
        //Create the querystring 
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT ?uid, ?name, ?password
            WHERE       
            {
                    _respondent predicates:resource_type        resources:respondent ;
                                        predicates:uid ?uid ;
                                        predicates:name ?name ;
                                        predicates:password ?password ;
                                        ' . ResearchToolObject::createArguments($arguments) .  '
            }';
        //Query the model
        $results = $model->sparqlQuery($querystring);
                $respondents = array();
        if(!empty($results))
        {
            //Run over all results and create appropriate Respondent objets
            foreach($results as $result)
            { 
                    $respondents[] = new Respondent($result['?uid']->label, $result['?name']->label, $result['?password']->label);
            }
        }
        return $respondents;
        }
}