adding a pagination api

ref #24

Pagination/PageGenerator.php

@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * Chill is a software for social workers
+ * Copyright (C) 2016 Champs-Libres Coopérative <info@champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Chill\MainBundle\Pagination;
+
+/**
+ * PageGenerator associated with a Paginator
+ *
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ * @author Champs Libres <info@champs-libres.coop>
+ */
+class PageGenerator implements \Iterator
+{
+    /**
+     *
+     * @var Paginator
+     */
+    protected $paginator;
+    
+    /**
+     *
+     * @var int
+     */
+    protected $current = 1;
+    
+    public function __construct(Paginator $paginator) 
+    {
+        $this->paginator = $paginator;;
+    }
+    
+    public function current()
+    {
+        return $this->paginator->getPage($current);
+    }
+
+    public function key()
+    {
+        return $this->current;
+    }
+
+    public function next()
+    {
+        $this->current++;
+    }
+
+    public function rewind()
+    {
+        $this->current = 1;
+    }
+
+    public function valid()
+    {
+        return $this->current > 0 
+              && $this->current <= $this->paginator->countPages();
+    }
+}