Changeset 143 for Dev/branches/jos-branch/classes/AnswerConnector.php

Timestamp:

10/31/11 17:12:28 (14 years ago)

Author:

jkraaijeveld

Message:

Made lots of new connectors, stranded on Sessionconnector for now. Need to find a way to retain the order of applicaties and surveys of a pipeline.

File:

• Dev/branches/jos-branch/classes/AnswerConnector.php (modified) (2 diffs)

Dev/branches/jos-branch/classes/AnswerConnector.php

@@ -12 +12 @@
 class AnswerConnector implements IConnector{
     protected $model;
-    protected $fileName = 'data/users/users.rdf';
+        protected $fileName = 'data/answers/answers.rdf';
+        protected $db;
     
     /**
@@ -44 +45 @@
     }
     
+        /**
+         * Function get()
+         * Get the answers corresponding to the arguments
+         * 'Question' argument is supposed to be the question ID
+         * 'Values' has to be an array to make sure multiple answers can be selected.
+         */
     public function get($arguments)
-    {
-        
-    }
-    
+        {
+                $this->load();
+                $keys = array_keys($arguments);
+                $uid = "?uid"; $question = "?question_code"; $value     = ""; 
+                if(in_array("uid", $keys))
+                        $uid = '\''.$arguments["uid"].'\'';
+                if(in_array("question", $keys))
+                        $question = '\''.$arguments["question"].'\'';
+                if(in_array("values", $keys))
+                {
+                        foreach ($arguments["values"] as $val)
+                        {
+                                $value = $value . 'predicates:answered \'' . $val . '\' ';
+                        }
+                }
+                //Create the querystring
+                $querystring = '
+                        PREFIX predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
+                        PREFIX resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
+                        SELECT DISTINCT ?uid, ?question_code
+                        WHERE
+                        {
+                                _answer predicates:resource_type resources:answer;
+
+                                predicates:uid ?uid ;
+                                predicates:question_code ?question_code;
+
+                                predicates:uid ' . $uid . '
+                                predicates:question_code ' . $question . '      
+                                ' . $value . '
+                        }';
+
+                //Query the model
+                $results = $this->model->sparqlQuery($querystring);     
+                //An answer can have multiple values, get all these values for the answer instances found.
+                $answers = array();
+                if(!empty($results))
+                {
+            $this->db = new DatabaseInterface();
+                        foreach($results as $result)
+                        {
+                                $values = $this->getValues($result['?uid']->label);
+                                $questionResult = $this->db->get("question", array("uid" => $result['?question_code']->label));
+                                $answers[] = new Answer($result['?uid']->label, $questionResult[0], $values);
+                        }
+                }
+                return $answers;
+
+        }
+        /**
+         * Gets the values that belong to the answer
+         * specified by the UID
+         */
+        private function getValues($uid)
+        {
+                $querystring = '
+                        PREFIX predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
+                        PREFIX resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
+                        SELECT DISTINCT ?answered
+                        WHERE 
+                        {
+                                _answer predicates:resource_type resources:answer ;
+                                predicates:answered ?answered ;
+                                predicates:uid \''. $uid . '\'
+                }';
+                $values = $this->model->sparqlQuery($querystring);
+                $returnArray = array();
+                if(!empty($values))
+                {
+                        foreach($values as $value)
+                        {
+                                $returnArray[] = $value['?answered']->label;
+                        }
+                }
+                return $returnArray;
+        } 
+
     /**
-     *
+     * Saves the answer Object to the RDF file.
      * @param type $rToolObject
      */
     public function set($rToolObject)
     {
+        $this->load();
         
+        $resourceAnswer = new Resource(ANSWER.'/'.$rToolObject->uid);        
+        //Remove the old value stored with the given id
+        $this->model->subtract($this->model->find($resourceAnswer, null, null));
+        
+        //Save all the new values
+        $resourceAnswerType = new Resource(ANSWER);
+        $predicateRType = new Resource(RTYPE);
+        $this->model->add(new Statement($resourceAnswer,$predicateRType,$resourceAnswerType));
+        
+                $answerId = new Literal($rToolObject->uid);
+                $predicateId = new Resource(UID);
+                $this->model->add(new Statement($resourceAnswer, $predicateId, $answerId));
+
+                $questionId = new Literal($rToolObject->question->uid);
+                $predicateQId = new Resource(QCODE);
+                $this->model->add(new Statement($resourceAnswer, $predicateQId, $questionId));
+
+                if(isset($rToolObject->values))
+                {
+                        foreach($rToolObject->values as $value)
+                        {
+                                $answerValue = new Literal($value);
+                                $predicateAnswer = new Resource(ANSWERED);
+                                $this->model->add(new Statement($resourceAnswer, $predicateAnswer, $answerValue));
+                        }
+                }
+        $this->save();
     }
 }