Put flags in ES structure

lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Flag.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace Alchemy\Phrasea\SearchEngine\Elastic\Structure;
+
+use Alchemy\Phrasea\SearchEngine\Elastic\StringUtils;
+use Assert\Assertion;
+use InvalidArgumentException;
+
+class Flag
+{
+    private $name;
+
+    public static function createFromLegacyStatus(array $status)
+    {
+        if (!isset($status['labelon'])) {
+            throw new InvalidArgumentException('Status array must contain the "labelon" key.');
+        }
+        return new self(self::normalizeName($status['labelon']));
+    }
+
+    public function __construct($name)
+    {
+        Assertion::string($name);
+        $this->name = $name;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getIndexField()
+    {
+        return sprintf('flags.%s', $this->name);
+    }
+
+    public static function normalizeName($key)
+    {
+        return StringUtils::slugify($key, '_');
+    }
+
+    /*
+     * TODO: Rewrite to have all data injected at construct time in createFromLegacyStatus()
+     */
+    public function getBitPositionInDatabox(\databox $databox)
+    {
+        foreach ($databox->getStatusStructure() as $bit => $status) {
+            $candidate_name = self::normalizeName($status['labelon']);
+            if ($candidate_name === $this->name) {
+                return (int) $status['bit'];
+            }
+        }
+    }
+}