MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / includes / search / NullIndexField.php

diff --git a/includes/search/NullIndexField.php b/includes/search/NullIndexField.php
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+++ b/includes/search/NullIndexField.php
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+<?php
+
+/**
+ * Null index field - means search engine does not implement this field.
+ */
+class NullIndexField implements SearchIndexField {
+
+       /**
+        * Get mapping for specific search engine
+        * @param SearchEngine $engine
+        * @return array|null Null means this field does not map to anything
+        */
+       public function getMapping( SearchEngine $engine ) {
+               return null;
+       }
+
+       /**
+        * Set global flag for this field.
+        *
+        * @param int $flag Bit flag to set/unset
+        * @param bool $unset True if flag should be unset, false by default
+        * @return $this
+        */
+       public function setFlag( $flag, $unset = false ) {
+       }
+
+       /**
+        * Check if flag is set.
+        * @param int $flag
+        * @return int 0 if unset, !=0 if set
+        */
+       public function checkFlag( $flag ) {
+               return 0;
+       }
+
+       /**
+        * Merge two field definitions if possible.
+        *
+        * @param SearchIndexField $that
+        * @return SearchIndexField|false New definition or false if not mergeable.
+        */
+       public function merge( SearchIndexField $that ) {
+               return $that;
+       }
+
+       /**
+        * @inheritDoc
+        */
+       public function getEngineHints( SearchEngine $engine ) {
+               return [];
+       }
+}