11  * Abstract collection for direct 1:1 entity-token mappings
13  * In a direct collection each entity has exactly one token stored at the entity's position
14  * in the token index (entity.RID === token.RID). No frequency or reverse indexes are used.
34                     "Entity count ($ec) != token count ($tc)"
41      * Store a single token for the given entity
43      * Takes the first token from the list and writes it directly at the entity's position
44      * in the token index. An empty list stores an empty string.
62         $token = $tokens[0] ?? '';  variable in dokuwiki\\Search\\Collection\\DirectCollection
64         $tokenIndex->changeRow($entityId, $token);
71      * Get the token stored for the given entity
74      * @return string The stored token, or empty string if none
91         // In a DirectCollection, token RID = entity RID, frequency is always 1
106         foreach ($tokenIndex as $entityId => $token) {
107             if ($token === '') continue;
117      * Not actually used, because we override addEntity() to directly write the token.
122         $token = $tokens[0] ?? '';
123         return [$token => 1];