includes/search/SearchIndexField.php

   1 <?php
   2 /**
   3  * Definition of a mapping for the search index field.
   4  * @since 1.28
   5  */
   6 interface SearchIndexField {
   7         /**
   8          * Field types
   9          */
  10         const INDEX_TYPE_TEXT = 0;
  11         const INDEX_TYPE_KEYWORD = 1;
  12         const INDEX_TYPE_INTEGER = 2;
  13         const INDEX_TYPE_NUMBER = 3;
  14         const INDEX_TYPE_DATETIME = 4;
  15         const INDEX_TYPE_NESTED = 5;
  16         const INDEX_TYPE_BOOL = 6;
  17
  18         /**
  19          * SHORT_TEXT is meant to be used with short text made of mostly ascii
  20          * technical information. Generally a language agnostic analysis chain
  21          * is used and aggressive splitting to increase recall.
  22          * E.g suited for mime/type
  23          */
  24         const INDEX_TYPE_SHORT_TEXT = 7;
  25
  26         /**
  27          * Generic field flags.
  28          */
  29         /**
  30          * This field is case-insensitive.
  31          */
  32         const FLAG_CASEFOLD = 1;
  33
  34         /**
  35          * This field contains secondary information, which is
  36          * already present in other fields, but can be used for
  37          * scoring.
  38          */
  39         const FLAG_SCORING = 2;
  40
  41         /**
  42          * This field does not need highlight handling.
  43          */
  44         const FLAG_NO_HIGHLIGHT = 4;
  45
  46         /**
  47          * Do not index this field, just store it.
  48          */
  49         const FLAG_NO_INDEX = 8;
  50
  51         /**
  52          * Get mapping for specific search engine
  53          * @param SearchEngine $engine
  54          * @return array|null Null means this field does not map to anything
  55          */
  56         public function getMapping( SearchEngine $engine );
  57
  58         /**
  59          * Set global flag for this field.
  60          *
  61          * @param int $flag Bit flag to set/unset
  62          * @param bool $unset True if flag should be unset, false by default
  63          * @return $this
  64          */
  65         public function setFlag( $flag, $unset = false );
  66
  67         /**
  68          * Check if flag is set.
  69          * @param int $flag
  70          * @return int 0 if unset, !=0 if set
  71          */
  72         public function checkFlag( $flag );
  73
  74         /**
  75          * Merge two field definitions if possible.
  76          *
  77          * @param SearchIndexField $that
  78          * @return SearchIndexField|false New definition or false if not mergeable.
  79          */
  80         public function merge( SearchIndexField $that );
  81
  82         /**
  83          * A list of search engine hints for this field.
  84          * Hints are usually specific to a search engine implementation
  85          * and allow to fine control how the search engine will handle this
  86          * particular field.
  87          *
  88          * For example some search engine permits some optimizations
  89          * at index time by ignoring an update if the updated value
  90          * does not change by more than X% on a numeric value.
  91          *
  92          * @param SearchEngine $engine
  93          * @return array an array of hints generally indexed by hint name. The type of
  94          * values is search engine specific
  95          * @since 1.30
  96          */
  97         public function getEngineHints( SearchEngine $engine );
  98 }