source: Dev/branches/jos-branch/classes/models/User.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 User
 *
 * @author jkraaijeveld
 */

class User extends ResearchToolObject {

        //Static Database-related information.
        private static $filename = 'data/users/users.rdf';
    
    public $name;
    public $password;
    
    /**
     * Constructor of User
     * If the user does not yet exist in the database, call with null as first parameter
     */
    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/');

                $model = ResearchToolObject::load(User::$filename);
        $resourceUser = new Resource(USER . '/' . $this->uid);
        //Remove the old value stored with the given id
        $model->subtract($model->find($resourceUser, null, null));

        $resourceUserType = new Resource(USER);
        $predicateRType = new Resource(RTYPE);
        $model->add(new Statement($resourceUser,$predicateRType,$resourceUserType));

        $literalUserID = new Literal($this->uid);
        $predicateUniqueID = new Resource(UID);
        $model->add(new Statement($resourceUser,$predicateUniqueID,$literalUserID));
        
        $literalUserName = new Literal($this->name);
        $predicateName = new Resource(NAME);
        $model->add(new Statement($resourceUser,$predicateName,$literalUserName));                      

        $literalPassword = new Literal($this->password);
        $predicatePassword = new Resource(PASSWORD);
                $model->add(new Statement($resourceUser,$predicatePassword,$literalPassword));

                $model->saveAs(User::$filename, 'rdf');
                return true;
        }


        /**
         * static function get($arguments)
         * Gets the array of User 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)
        {
            $model = ResearchToolObject::load(User::$filename);
        //Create the querystring 
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT ?uid, ?name, ?password
            WHERE       
            {
                    _user       predicates:resource_type        resources:user ;
                                        predicates:uid ?uid ;
                                        predicates:name ?name ;
                                        predicates:password ?password ;
                                        ' . ResearchToolObject::createArguments($arguments) . '
            }';
        //Query the model
                $results = $model->sparqlQuery($querystring);
        $users = array();
        if(!empty($results))
        {
            //Run over all results and create appropriate User objects
            foreach($results as $result)
            { 
                    $users[] = new User($result['?uid']->label, $result['?name']->label, $result['?password']->label);
            }
        }
        return $users;
        }
        
        
}

?>