<?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 UserConnector
 *
 * @author jkraaijeveld
 */
class UserConnector extends Connector{
    
    /**
     * Constructor for UserConnector.
     */
    public function __construct()
    {
		$this->fileName = 'data/users/users.rdf';
        //Ensure the required folder for this connector exists
        if (!is_dir('data/users/'))
            mkdir('data/users/');	
    }
    
    /**
     * function get($arguments)
     * Gets the array of User objects belonging to arguments supplied.
     * @param type $arguments : An array containing zero or more of the following keys:
     *                          'uid', 'name', 'password'
     */
    public function get($arguments) {
        $this->load();
        //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 ;
					' . $this->createArguments($arguments) . '
            }';
        //Query the model
		$results = $this->model->sparqlQuery($querystring);
        $users = array();
        if(!empty($results))
        {
            //Run over all results and create appropriate Application objets
            foreach($results as $result)
            { 
                    $users[] = new User($result['?uid']->label, $result['?name']->label, $result['?password']->label);
            }
        }
        return $users;
    }
    
    /**
     * Save the given User object in the file.
     * @param type $rToolObject 
     */
    public function set($rToolObject)
    {
        $this->load();
        $resourceUser = new Resource(USER . '/' . $rToolObject->uid);
        //Remove the old value stored with the given id
        $this->model->subtract($this->model->find($resourceUser, null, null));

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

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

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

?>