wikimedia/mediawiki-extensions-Wikibase

<?php

declare( strict_types=1 );
namespace Wikibase\Lib\Store\Sql\Terms;

/**
 * Trait for code reuse of mapping for entity term storage
 *
 * @see @ref docs_storage_terms
 * @license GPL-2.0-or-later
 */
trait NormalizedTermStorageMappingTrait {

    /** @var NormalizedTermStorageMapping|null */
    private $mapping;

    abstract protected function makeMapping(): NormalizedTermStorageMapping;

    private function getMapping(): NormalizedTermStorageMapping {
        if ( $this->mapping === null ) {
            $this->mapping = $this->makeMapping();
        }
        return $this->mapping;
    }
}