Added version as metadata field. (#715)

* Added version as metadata field.

* Added proper annotations and fixed PSR2 style issues.

* Changed the line ending character from CRLF to LF

Author: MihaiNeagu

Annotation/Version.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the ONGR package.
+ *
+ * (c) NFQ Technologies UAB <info@nfq.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace ONGR\ElasticsearchBundle\Annotation;
+
+/**
+ * Associates document property with _version meta-field.
+ *
+ * @Annotation
+ * @Target("PROPERTY")
+ */
+final class Version implements MetaField
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return '_version';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSettings()
+    {
+        return [];
+    }
+}

Mapping/DocumentParser.php

@@ -37,6 +37,7 @@ class DocumentParser
     const PARENT_ANNOTATION = 'ONGR\ElasticsearchBundle\Annotation\ParentDocument';
     const TTL_ANNOTATION = 'ONGR\ElasticsearchBundle\Annotation\Ttl';
     const ROUTING_ANNOTATION = 'ONGR\ElasticsearchBundle\Annotation\Routing';
+    const VERSION_ANNOTATION = 'ONGR\ElasticsearchBundle\Annotation\Version';
 
     /**
      * @var Reader Used to read document annotations.
@@ -177,6 +178,7 @@ private function getMetaFieldAnnotationData($property)
         $annotation = $annotation ?: $this->reader->getPropertyAnnotation($property, self::PARENT_ANNOTATION);
         $annotation = $annotation ?: $this->reader->getPropertyAnnotation($property, self::TTL_ANNOTATION);
         $annotation = $annotation ?: $this->reader->getPropertyAnnotation($property, self::ROUTING_ANNOTATION);
+        $annotation = $annotation ?: $this->reader->getPropertyAnnotation($property, self::VERSION_ANNOTATION);
 
         if ($annotation === null) {
             return null;
@@ -358,6 +360,7 @@ private function registerAnnotations()
             'ParentDocument',
             'Ttl',
             'Routing',
+            'Version',
         ];
 
         foreach ($annotations as $annotation) {