includes/pager/ReverseChronologicalPager.php

   1 <?php
   2 /**
   3  * Efficient paging for SQL queries.
   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  * @file
  21  * @ingroup Pager
  22  */
  23
  24 /**
  25  * IndexPager with a formatted navigation bar
  26  * @ingroup Pager
  27  */
  28 abstract class ReverseChronologicalPager extends IndexPager {
  29         public $mDefaultDirection = IndexPager::DIR_DESCENDING;
  30         public $mYear;
  31         public $mMonth;
  32
  33         function getNavigationBar() {
  34                 if ( !$this->isNavigationBarShown() ) {
  35                         return '';
  36                 }
  37
  38                 if ( isset( $this->mNavigationBar ) ) {
  39                         return $this->mNavigationBar;
  40                 }
  41
  42                 $linkTexts = array(
  43                         'prev' => $this->msg( 'pager-newer-n' )->numParams( $this->mLimit )->escaped(),
  44                         'next' => $this->msg( 'pager-older-n' )->numParams( $this->mLimit )->escaped(),
  45                         'first' => $this->msg( 'histlast' )->escaped(),
  46                         'last' => $this->msg( 'histfirst' )->escaped()
  47                 );
  48
  49                 $pagingLinks = $this->getPagingLinks( $linkTexts );
  50                 $limitLinks = $this->getLimitLinks();
  51                 $limits = $this->getLanguage()->pipeList( $limitLinks );
  52                 $firstLastLinks = $this->msg( 'parentheses' )->rawParams( "{$pagingLinks['first']}" .
  53                         $this->msg( 'pipe-separator' )->escaped() .
  54                         "{$pagingLinks['last']}" )->escaped();
  55
  56                 $this->mNavigationBar = $firstLastLinks . ' ' .
  57                         $this->msg( 'viewprevnext' )->rawParams(
  58                                 $pagingLinks['prev'], $pagingLinks['next'], $limits )->escaped();
  59
  60                 return $this->mNavigationBar;
  61         }
  62
  63         function getDateCond( $year, $month ) {
  64                 $year = intval( $year );
  65                 $month = intval( $month );
  66
  67                 // Basic validity checks
  68                 $this->mYear = $year > 0 ? $year : false;
  69                 $this->mMonth = ( $month > 0 && $month < 13 ) ? $month : false;
  70
  71                 // Given an optional year and month, we need to generate a timestamp
  72                 // to use as "WHERE rev_timestamp <= result"
  73                 // Examples: year = 2006 equals < 20070101 (+000000)
  74                 // year=2005, month=1    equals < 20050201
  75                 // year=2005, month=12   equals < 20060101
  76                 if ( !$this->mYear && !$this->mMonth ) {
  77                         return;
  78                 }
  79
  80                 if ( $this->mYear ) {
  81                         $year = $this->mYear;
  82                 } else {
  83                         // If no year given, assume the current one
  84                         $timestamp = MWTimestamp::getInstance();
  85                         $year = $timestamp->format( 'Y' );
  86                         // If this month hasn't happened yet this year, go back to last year's month
  87                         if ( $this->mMonth > $timestamp->format( 'n' ) ) {
  88                                 $year--;
  89                         }
  90                 }
  91
  92                 if ( $this->mMonth ) {
  93                         $month = $this->mMonth + 1;
  94                         // For December, we want January 1 of the next year
  95                         if ( $month > 12 ) {
  96                                 $month = 1;
  97                                 $year++;
  98                         }
  99                 } else {
 100                         // No month implies we want up to the end of the year in question
 101                         $month = 1;
 102                         $year++;
 103                 }
 104
 105                 // Y2K38 bug
 106                 if ( $year > 2032 ) {
 107                         $year = 2032;
 108                 }
 109
 110                 $ymd = (int)sprintf( "%04d%02d01", $year, $month );
 111
 112                 if ( $ymd > 20320101 ) {
 113                         $ymd = 20320101;
 114                 }
 115
 116                 $this->mOffset = $this->mDb->timestamp( "${ymd}000000" );
 117         }
 118 }