includes/SearchOracle.php

   1 <?php
   2 # Copyright (C) 2004 Brion Vibber <brion@pobox.com>
   3 # http://www.mediawiki.org/
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along
  16 # with this program; if not, write to the Free Software Foundation, Inc.,
  17 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Search engine hook base class for Oracle (ConText).
  22  * @addtogroup Search
  23  */
  24 class SearchOracle extends SearchEngine {
  25         function __construct($db) {
  26                 $this->db = $db;
  27         }
  28
  29         /**
  30          * Perform a full text search query and return a result set.
  31          *
  32          * @param string $term - Raw search term
  33          * @return OracleSearchResultSet
  34          * @access public
  35          */
  36         function searchText( $term ) {
  37                 $resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), true)));
  38                 return new OracleSearchResultSet($resultSet, $this->searchTerms);
  39         }
  40
  41         /**
  42          * Perform a title-only search query and return a result set.
  43          *
  44          * @param string $term - Raw search term
  45          * @return ORacleSearchResultSet
  46          * @access public
  47          */
  48         function searchTitle($term) {
  49                 $resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), false)));
  50                 return new MySQLSearchResultSet($resultSet, $this->searchTerms);
  51         }
  52
  53
  54         /**
  55          * Return a partial WHERE clause to exclude redirects, if so set
  56          * @return string
  57          * @private
  58          */
  59         function queryRedirect() {
  60                 if ($this->showRedirects) {
  61                         return '';
  62                 } else {
  63                         return 'AND page_is_redirect=0';
  64                 }
  65         }
  66
  67         /**
  68          * Return a partial WHERE clause to limit the search to the given namespaces
  69          * @return string
  70          * @private
  71          */
  72         function queryNamespaces() {
  73                 $namespaces = implode(',', $this->namespaces);
  74                 if ($namespaces == '') {
  75                         $namespaces = '0';
  76                 }
  77                 return 'AND page_namespace IN (' . $namespaces . ')';
  78         }
  79
  80         /**
  81          * Return a LIMIT clause to limit results on the query.
  82          * @return string
  83          * @private
  84          */
  85         function queryLimit($sql) {
  86                 return $this->db->limitResult($sql, $this->limit, $this->offset);
  87         }
  88
  89         /**
  90          * Does not do anything for generic search engine
  91          * subclasses may define this though
  92          * @return string
  93          * @private
  94          */
  95         function queryRanking($filteredTerm, $fulltext) {
  96                 return ' ORDER BY score(1)';
  97         }
  98
  99         /**
 100          * Construct the full SQL query to do the search.
 101          * The guts shoulds be constructed in queryMain()
 102          * @param string $filteredTerm
 103          * @param bool $fulltext
 104          * @private
 105          */
 106         function getQuery( $filteredTerm, $fulltext ) {
 107                 return $this->queryLimit($this->queryMain($filteredTerm, $fulltext) . ' ' .
 108                         $this->queryRedirect() . ' ' .
 109                         $this->queryNamespaces() . ' ' .
 110                         $this->queryRanking( $filteredTerm, $fulltext ) . ' ');
 111         }
 112
 113
 114         /**
 115          * Picks which field to index on, depending on what type of query.
 116          * @param bool $fulltext
 117          * @return string
 118          */
 119         function getIndexField($fulltext) {
 120                 return $fulltext ? 'si_text' : 'si_title';
 121         }
 122
 123         /**
 124          * Get the base part of the search query.
 125          *
 126          * @param string $filteredTerm
 127          * @param bool $fulltext
 128          * @return string
 129          * @private
 130          */
 131         function queryMain( $filteredTerm, $fulltext ) {
 132                 $match = $this->parseQuery($filteredTerm, $fulltext);
 133                 $page        = $this->db->tableName('page');
 134                 $searchindex = $this->db->tableName('searchindex');
 135                 return 'SELECT page_id, page_namespace, page_title ' .
 136                         "FROM $page,$searchindex " .
 137                         'WHERE page_id=si_page AND ' . $match;
 138         }
 139
 140         /** @todo document */
 141         function parseQuery($filteredText, $fulltext) {
 142                 global $wgContLang;
 143                 $lc = SearchEngine::legalSearchChars();
 144                 $this->searchTerms = array();
 145
 146                 # FIXME: This doesn't handle parenthetical expressions.
 147                 $m = array();
 148                 $q = array();
 149
 150                 if (preg_match_all('/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
 151                           $filteredText, $m, PREG_SET_ORDER)) {
 152                         foreach($m as $terms) {
 153                                 $q[] = $terms[1] . $wgContLang->stripForSearch($terms[2]);
 154
 155                                 if (!empty($terms[3])) {
 156                                         $regexp = preg_quote( $terms[3], '/' );
 157                                         if ($terms[4])
 158                                                 $regexp .= "[0-9A-Za-z_]+";
 159                                 } else {
 160                                         $regexp = preg_quote(str_replace('"', '', $terms[2]), '/');
 161                                 }
 162                                 $this->searchTerms[] = $regexp;
 163                         }
 164                 }
 165
 166                 $searchon = $this->db->strencode(join(',', $q));
 167                 $field = $this->getIndexField($fulltext);
 168                 return " CONTAINS($field, '$searchon', 1) > 0 ";
 169         }
 170
 171         /**
 172          * Create or update the search index record for the given page.
 173          * Title and text should be pre-processed.
 174          *
 175          * @param int $id
 176          * @param string $title
 177          * @param string $text
 178          */
 179         function update($id, $title, $text) {
 180                 $dbw = wfGetDB(DB_MASTER);
 181                 $dbw->replace('searchindex',
 182                         array('si_page'),
 183                         array(
 184                                 'si_page' => $id,
 185                                 'si_title' => $title,
 186                                 'si_text' => $text
 187                         ), 'SearchOracle::update' );
 188                 $dbw->query("CALL ctx_ddl.sync_index('si_text_idx')");
 189                 $dbw->query("CALL ctx_ddl.sync_index('si_title_idx')");
 190         }
 191
 192         /**
 193          * Update a search index record's title only.
 194          * Title should be pre-processed.
 195          *
 196          * @param int $id
 197          * @param string $title
 198          */
 199         function updateTitle($id, $title) {
 200                 $dbw = wfGetDB(DB_MASTER);
 201
 202                 $dbw->update('searchindex',
 203                         array('si_title' => $title),
 204                         array('si_page'  => $id),
 205                         'SearchOracle::updateTitle',
 206                         array());
 207         }
 208 }
 209
 210 /**
 211  * @addtogroup Search
 212  */
 213 class OracleSearchResultSet extends SearchResultSet {
 214         function __construct($resultSet, $terms) {
 215                 $this->mResultSet = $resultSet;
 216                 $this->mTerms = $terms;
 217         }
 218
 219         function termMatches() {
 220                 return $this->mTerms;
 221         }
 222
 223         function numRows() {
 224                 return $this->mResultSet->numRows();
 225         }
 226
 227         function next() {
 228                 $row = $this->mResultSet->fetchObject();
 229                 if ($row === false)
 230                         return false;
 231                 return new SearchResult($row);
 232         }
 233 }
 234
 235