includes/search/SearchResultSetTrait.php

   1 <?php
   2
   3 /**
   4  * Trait useful for SearchResultSet implementations.
   5  * It holds the functions that are rarely needed to be overridden.
   6  *
   7  * This trait can be used directly by extensions providing a SearchEngine.
   8  *
   9  * @ingroup Search
  10  * @phan-file-suppress PhanUndeclaredMethod
  11  */
  12 trait SearchResultSetTrait {
  13         /**
  14          * Set of result's extra data, indexed per result id
  15          * and then per data item name.
  16          * The structure is:
  17          * PAGE_ID => [ augmentor name => data, ... ]
  18          * @var array[]
  19          */
  20         private $extraData = [];
  21
  22         /**
  23          * Sets augmented data for result set.
  24          * @param string $name Extra data item name
  25          * @param array[] $data Extra data as PAGEID => data
  26          */
  27         public function setAugmentedData( $name, $data ) {
  28                 foreach ( $data as $id => $resultData ) {
  29                         $this->extraData[$id][$name] = $resultData;
  30                 }
  31         }
  32
  33         /**
  34          * Returns extra data for specific result and store it in SearchResult object.
  35          * @param SearchResult $result
  36          */
  37         public function augmentResult( SearchResult $result ) {
  38                 $id = $result->getTitle()->getArticleID();
  39                 if ( $id === -1 ) {
  40                         return;
  41                 }
  42                 $result->setExtensionData( function () use ( $id ) {
  43                         return $this->extraData[$id] ?? [];
  44                 } );
  45         }
  46
  47         /**
  48          * @return int|null The offset the current page starts at. Typically
  49          *  this should be null to allow the UI to decide on its own, but in
  50          *  special cases like interleaved AB tests specifying explicitly is
  51          *  necessary.
  52          */
  53         public function getOffset() {
  54                 return null;
  55         }
  56
  57         final public function getIterator() {
  58                 return new ArrayIterator( $this->extractResults() );
  59         }
  60 }