1<?php 2 3namespace dokuwiki\Search\Collection; 4 5/** 6 * Abstract collection for lookup-based indexes 7 * 8 * In a lookup collection each token appears at most once per entity (frequency is always 1). 9 * Internally the same mechanisms as FrequencyCollection are used; only the way tokens are 10 * processed on input differs (deduplication instead of counting). 11 * 12 * @license GPL 2 (http://www.gnu.org/licenses/gpl.html) 13 * @author Andreas Gohr <andi@splitbrain.org> 14 */ 15abstract class LookupCollection extends AbstractCollection 16{ 17 /** @inheritdoc */ 18 protected function countTokens(array $tokens): array 19 { 20 return array_fill_keys(array_unique($tokens), 1); 21 } 22} 23