source: Dev/branches/jos-branch/classes/models/ResultSet.php @ 229

<?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 ResultSet
 */
class ResultSet extends ResearchToolObject{

        private static $filename = 'data/results/resultsets.rdf';

        public $answersets;
        public $playerresults;
        public $groupresults;
        public $periodicresults;

        /**
         * Constructor for an ResultSet object.
         * @param type $uid
         * @param type $answersets;
         * @param type $playerresults;
         * @param type $groupresults;
         * @param type $periodicresults;
         */
        public function __construct($uid=null, $answersets = null, $playerresults = null, $groupresults = null, $periodicresults = null)
        {
                if(!isset($uid))
                {
                        $uid = md5(uniqid(rand(), true));
                }
                
                $this->uid = $uid;
                $this->answersets = $answersets;
                $this->playerresults = $playerresults;
                $this->groupresults = $groupresults;
                $this->periodicresults = $periodicresults;
        }

        /**
         * funtion evaluate()
         * evaluates the references of all results
         */
        public function evaluate()
        {
                if(!empty($this->answersets) && is_string($this->answersets[0]))
                {
                        $newAnswerSets = array();
                        foreach($this->answersets as $answerSet)
                        {
                                $result = AnswerSet::get(array("uid" => $answerSet));
                                if(!isset($result[0]))
                                        return false;
                                $newAnswerSets[] = $result[0];
                        }                       
                        $this->answersets = $newAnswerSets;
                }
                //TODO: Evaluate the other sets when they are implemented.

                return true;
        }

        /**
         * function save()
         * Saves the current object into the database.
         */
        public function save()
        {
                //If evaluation fails, some references are incorrect.
                //We shouldn't save in this case. Instead - let the user know. This function returns false if the evaluation has failed.
                //TODO: Decide how to fix invalid references graciously.
                if(!$this->evaluate()) 
                        return false;
                //Ensure the required folder exists.
                if(!is_dir('data/results/'))
                        mkdir('data/results/');

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

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

                //Set new values
                $resourceResultSetType = new Resource(RESULTSET);
                $predicateRType = new Resource(RTYPE);
                $model->add(new Statement($resourceResultSet, $predicateRType, $resourceResultSetType));

                $resultSetId = new Literal($this->uid);
                $predicateId = new Resource(UID);
                $model->add(new Statement($resourceResultSet, $predicateId, $resultSetId));

                if(isset($this->answersets))
                {
                        foreach($this->answersets as $answerset)
                        {
                                $answerSetId = new Literal($answerset->uid);
                                $predicateAnswerSet = new Resource(HAS_ANSWERSET);
                                $model->add(new Statement($resourceResultSet, $predicateAnswerSet, $answerSetId));
                        }
                }

                //TODO: store other sets when they are implemented.

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

        /**
         * function get()
         * @param type $arguments : An array having one or more of the following elements:
         * 'uid', 'answersets', 'playerresults', 'groupresults', 'periodicresults'
         */
        public static function get($arguments)
        {
                $model = ResearchToolObject::load(ResultSet::$filename);
                //Build the query string
                $querystring = '
                        PREFIX predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
                        PREFIX resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
                        SELECT DISTINCT ?uid
                        WHERE
                        {
                                _resultset predicates:resource_type resources:resultset ;
                                predicates:uid ?uid ;
                                ' . ResearchToolObject::createArguments($arguments) . '
                        }';
                //Query the model
                $results = $model->sparqlQuery($querystring);
                $resultSets = array();
                if(!empty($results))
                {
                        foreach($results as $result)
                        {
                                $answerSets = ResultSet::getAnswerSets($model, $result['?uid']->label);
                                $resultSets[] = new ResultSet($result['?uid']->label, $answerSets, array(), array(), array());
                        }
                }
                return $resultSets;
        }

        /**
         * function getAnswerSets()
         * @param type $uid : The ResultSet uid for which the answerSets should be retrieved.
         */
        private static function getAnswerSets($model, $uid)
        {
                $result = $model->findRegex("[(".$uid.")]", "[(has_answerset)]" ,null);
                $iterator = $result->getStatementIterator();
                $answersets = array();
                while($iterator->hasNext())
                {
                        $element = $iterator->next();
                        $answersets[] = $element->getLabelObject();
                }
                return $answersets;
        }



}