1 files changed, 52 insertions, 0 deletions
diff --git a/www/wiki/includes/search/NullIndexField.php b/www/wiki/includes/search/NullIndexField.php
new file mode 100644
index 00000000..ff1e8cbf
--- /dev/null
+++ b/www/wiki/includes/search/NullIndexField.php
@@ -0,0 +1,52 @@
+<?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 [];
+	}
+}