includes/WatchedItem.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup Watchlist
   5  */
   6
   7 /**
   8  * @ingroup Watchlist
   9  */
  10 class WatchedItem {
  11         var $mTitle, $mUser, $id, $ns, $ti;
  12
  13         /**
  14          * Create a WatchedItem object with the given user and title
  15          * @param $user User: the user to use for (un)watching
  16          * @param $title Title: the title we're going to (un)watch
  17          * @return WatchedItem object
  18          */
  19         public static function fromUserTitle( $user, $title ) {
  20                 $wl = new WatchedItem;
  21                 $wl->mUser = $user;
  22                 $wl->mTitle = $title;
  23                 $wl->id = $user->getId();
  24                 # Patch (also) for email notification on page changes T.Gries/M.Arndt 11.09.2004
  25                 # TG patch: here we do not consider pages and their talk pages equivalent - why should we ?
  26                 # The change results in talk-pages not automatically included in watchlists, when their parent page is included
  27                 # $wl->ns = $title->getNamespace() & ~1;
  28                 $wl->ns = $title->getNamespace();
  29
  30                 $wl->ti = $title->getDBkey();
  31                 return $wl;
  32         }
  33
  34         /**
  35          * Is mTitle being watched by mUser?
  36          * @return bool
  37          */
  38         public function isWatched() {
  39                 # Pages and their talk pages are considered equivalent for watching;
  40                 # remember that talk namespaces are numbered as page namespace+1.
  41
  42                 $dbr = wfGetDB( DB_SLAVE );
  43                 $res = $dbr->select( 'watchlist', 1, array( 'wl_user' => $this->id, 'wl_namespace' => $this->ns,
  44                         'wl_title' => $this->ti ), __METHOD__ );
  45                 $iswatched = ($dbr->numRows( $res ) > 0) ? 1 : 0;
  46                 return $iswatched;
  47         }
  48
  49         /**
  50          * Given a title and user (assumes the object is setup), add the watch to the
  51          * database.
  52          * @return bool (always true)
  53          */
  54         public function addWatch() {
  55                 wfProfileIn( __METHOD__ );
  56
  57                 // Use INSERT IGNORE to avoid overwriting the notification timestamp
  58                 // if there's already an entry for this page
  59                 $dbw = wfGetDB( DB_MASTER );
  60                 $dbw->insert( 'watchlist',
  61                   array(
  62                         'wl_user' => $this->id,
  63                         'wl_namespace' => MWNamespace::getSubject($this->ns),
  64                         'wl_title' => $this->ti,
  65                         'wl_notificationtimestamp' => null
  66                   ), __METHOD__, 'IGNORE' );
  67
  68                 // Every single watched page needs now to be listed in watchlist;
  69                 // namespace:page and namespace_talk:page need separate entries:
  70                 $dbw->insert( 'watchlist',
  71                   array(
  72                         'wl_user' => $this->id,
  73                         'wl_namespace' => MWNamespace::getTalk($this->ns),
  74                         'wl_title' => $this->ti,
  75                         'wl_notificationtimestamp' => null
  76                   ), __METHOD__, 'IGNORE' );
  77
  78                 wfProfileOut( __METHOD__ );
  79                 return true;
  80         }
  81
  82         /**
  83          * Same as addWatch, only the opposite.
  84          * @return bool
  85          */
  86         public function removeWatch() {
  87                 wfProfileIn( __METHOD__ );
  88
  89                 $success = false;
  90                 $dbw = wfGetDB( DB_MASTER );
  91                 $dbw->delete( 'watchlist',
  92                         array(
  93                                 'wl_user' => $this->id,
  94                                 'wl_namespace' => MWNamespace::getSubject($this->ns),
  95                                 'wl_title' => $this->ti
  96                         ), __METHOD__
  97                 );
  98                 if ( $dbw->affectedRows() ) {
  99                         $success = true;
 100                 }
 101
 102                 # the following code compensates the new behaviour, introduced by the
 103                 # enotif patch, that every single watched page needs now to be listed
 104                 # in watchlist namespace:page and namespace_talk:page had separate
 105                 # entries: clear them
 106                 $dbw->delete( 'watchlist',
 107                         array(
 108                                 'wl_user' => $this->id,
 109                                 'wl_namespace' => MWNamespace::getTalk($this->ns),
 110                                 'wl_title' => $this->ti
 111                         ), __METHOD__
 112                 );
 113
 114                 if ( $dbw->affectedRows() ) {
 115                         $success = true;
 116                 }
 117
 118                 wfProfileOut( __METHOD__ );
 119                 return $success;
 120         }
 121
 122         /**
 123          * Check if the given title already is watched by the user, and if so
 124          * add watches on a new title. To be used for page renames and such.
 125          *
 126          * @param $ot Title: page title to duplicate entries from, if present
 127          * @param $nt Title: page title to add watches on
 128          */
 129         public static function duplicateEntries( $ot, $nt ) {
 130                 WatchedItem::doDuplicateEntries( $ot->getSubjectPage(), $nt->getSubjectPage() );
 131                 WatchedItem::doDuplicateEntries( $ot->getTalkPage(), $nt->getTalkPage() );
 132         }
 133
 134         /**
 135          * Handle duplicate entries. Backend for duplicateEntries().
 136          *
 137          * @param $ot Title
 138          * @param $nt Title
 139          *
 140          * @return bool
 141          */
 142         private static function doDuplicateEntries( $ot, $nt ) {
 143                 $oldnamespace = $ot->getNamespace();
 144                 $newnamespace = $nt->getNamespace();
 145                 $oldtitle = $ot->getDBkey();
 146                 $newtitle = $nt->getDBkey();
 147
 148                 $dbw = wfGetDB( DB_MASTER );
 149                 $res = $dbw->select( 'watchlist', 'wl_user',
 150                         array( 'wl_namespace' => $oldnamespace, 'wl_title' => $oldtitle ),
 151                         __METHOD__, 'FOR UPDATE'
 152                 );
 153                 # Construct array to replace into the watchlist
 154                 $values = array();
 155                 foreach ( $res as $s ) {
 156                         $values[] = array(
 157                                 'wl_user' => $s->wl_user,
 158                                 'wl_namespace' => $newnamespace,
 159                                 'wl_title' => $newtitle
 160                         );
 161                 }
 162
 163                 if( empty( $values ) ) {
 164                         // Nothing to do
 165                         return true;
 166                 }
 167
 168                 # Perform replace
 169                 # Note that multi-row replace is very efficient for MySQL but may be inefficient for
 170                 # some other DBMSes, mostly due to poor simulation by us
 171                 $dbw->replace( 'watchlist', array( array( 'wl_user', 'wl_namespace', 'wl_title' ) ), $values, __METHOD__ );
 172                 return true;
 173         }
 174 }