NullIndexField.php
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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 ) {
	return $this;
	}

	/**
	* 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 [];
	}
	}