[wip] add different steps to exports

Export/Export/CountPerson.php

@@ -22,6 +22,7 @@ namespace Chill\PersonBundle\Export\Export;
 use Chill\MainBundle\Export\ExportInterface;
 use Doctrine\ORM\QueryBuilder;
 use Symfony\Component\Form\FormBuilderInterface;
+use Doctrine\ORM\Query;
 
 /**
  * 
@@ -63,6 +64,33 @@ class CountPerson implements ExportInterface
         return $qb;
     }
     
+    public function getResult($qb, $data)
+    {
+        return $qb->getQuery()->getResult(Query::HYDRATE_SCALAR);
+    }
+    
+    public function getQueryKeys($data)
+    {
+        return array('export_result');
+    }
+    
+    public function getLabels($key, array $values, $data)
+    {
+        if ($key !== 'export_result') {
+            throw new \LogicException("the key $key is not used by this export");
+        }
+        
+        $labels = array_combine($values, $values);
+        $labels['_header'] = 'Number of people';
+        
+        return $labels;
+    }
+    
+    public function getAllowedFormattersTypes()
+    {
+        return array('tabular');
+    }
+    
     public function buildForm(FormBuilderInterface $builder) {
         throw new \LogicException('This export does not require a form');
     }