/**
* Basic pager interface.
+ * @addtogroup Pager
*/
interface Pager {
function getNavigationBar();
/**
* IndexPager is an efficient pager which uses a (roughly unique) index in the
* data set to implement paging, rather than a "LIMIT offset,limit" clause.
- * In MySQL, such a limit/offset clause requires counting through the specified number
- * of offset rows to find the desired data, which can be expensive for large offsets.
+ * In MySQL, such a limit/offset clause requires counting through the
+ * specified number of offset rows to find the desired data, which can be
+ * expensive for large offsets.
*
- * ReverseChronologicalPager is a child class of the abstract IndexPager, and contains
- * some formatting and display code which is specific to the use of timestamps as
- * indexes. Here is a synopsis of its operation:
+ * ReverseChronologicalPager is a child class of the abstract IndexPager, and
+ * contains some formatting and display code which is specific to the use of
+ * timestamps as indexes. Here is a synopsis of its operation:
*
- * * The query is specified by the offset, limit and direction (dir) parameters, in
- * addition to any subclass-specific parameters.
+ * * The query is specified by the offset, limit and direction (dir)
+ * parameters, in addition to any subclass-specific parameters.
+ * * The offset is the non-inclusive start of the DB query. A row with an
+ * index value equal to the offset will never be shown.
+ * * The query may either be done backwards, where the rows are returned by
+ * the database in the opposite order to which they are displayed to the
+ * user, or forwards. This is specified by the "dir" parameter, dir=prev
+ * means backwards, anything else means forwards. The offset value
+ * specifies the start of the database result set, which may be either
+ * the start or end of the displayed data set. This allows "previous"
+ * links to be implemented without knowledge of the index value at the
+ * start of the previous page.
+ * * An additional row beyond the user-specified limit is always requested.
+ * This allows us to tell whether we should display a "next" link in the
+ * case of forwards mode, or a "previous" link in the case of backwards
+ * mode. Determining whether to display the other link (the one for the
+ * page before the start of the database result set) can be done
+ * heuristically by examining the offset.
*
- * * The offset is the non-inclusive start of the DB query. A row with an index value
- * equal to the offset will never be shown.
+ * * An empty offset indicates that the offset condition should be omitted
+ * from the query. This naturally produces either the first page or the
+ * last page depending on the dir parameter.
*
- * * The query may either be done backwards, where the rows are returned by the database
- * in the opposite order to which they are displayed to the user, or forwards. This is
- * specified by the "dir" parameter, dir=prev means backwards, anything else means
- * forwards. The offset value specifies the start of the database result set, which
- * may be either the start or end of the displayed data set. This allows "previous"
- * links to be implemented without knowledge of the index value at the start of the
- * previous page.
+ * Subclassing the pager to implement concrete functionality should be fairly
+ * simple, please see the examples in PageHistory.php and
+ * SpecialIpblocklist.php. You just need to override formatRow(),
+ * getQueryInfo() and getIndexField(). Don't forget to call the parent
+ * constructor if you override it.
*
- * * An additional row beyond the user-specified limit is always requested. This allows
- * us to tell whether we should display a "next" link in the case of forwards mode,
- * or a "previous" link in the case of backwards mode. Determining whether to
- * display the other link (the one for the page before the start of the database
- * result set) can be done heuristically by examining the offset.
- *
- * * An empty offset indicates that the offset condition should be omitted from the query.
- * This naturally produces either the first page or the last page depending on the
- * dir parameter.
- *
- * Subclassing the pager to implement concrete functionality should be fairly simple,
- * please see the examples in PageHistory.php and SpecialIpblocklist.php. You just need
- * to override formatRow(), getQueryInfo() and getIndexField(). Don't forget to call the
- * parent constructor if you override it.
+ * @addtogroup Pager
*/
abstract class IndexPager implements Pager {
public $mRequest;
public $mResult;
function __construct() {
- global $wgRequest;
+ global $wgRequest, $wgUser;
$this->mRequest = $wgRequest;
-
- # NB: the offset is quoted, not validated. It is treated as an arbitrary string
- # to support the widest variety of index types. Be careful outputting it into
- # HTML!
+
+ # NB: the offset is quoted, not validated. It is treated as an
+ # arbitrary string to support the widest variety of index types. Be
+ # careful outputting it into HTML!
$this->mOffset = $this->mRequest->getText( 'offset' );
- $this->mLimit = $this->mRequest->getInt( 'limit', $this->mDefaultLimit );
- if ( $this->mLimit <= 0 || $this->mLimit > 50000 ) {
- $this->mLimit = $this->mDefaultLimit;
- }
+
+ # Use consistent behavior for the limit options
+ $this->mDefaultLimit = intval( $wgUser->getOption( 'rclimit' ) );
+ list( $this->mLimit, /* $offset */ ) = $this->mRequest->getLimitOffset();
+
$this->mIsBackwards = ( $this->mRequest->getVal( 'dir' ) == 'prev' );
$this->mIndexField = $this->getIndexField();
$this->mDb = wfGetDB( DB_SLAVE );
$this->mResult = $this->reallyDoQuery( $this->mOffset, $queryLimit, $descending );
$this->extractResultInfo( $this->mOffset, $queryLimit, $this->mResult );
$this->mQueryDone = true;
+
+ $this->preprocessResults( $this->mResult );
+ $this->mResult->rewind(); // Paranoia
wfProfileOut( $fname );
}
$lastIndex = $row[$this->mIndexField];
} else {
$this->mPastTheEndRow = null;
- # Setting indexes to an empty string means that they will be omitted
- # if they would otherwise appear in URLs. It just so happens that this
- # is the right thing to do in the standard UI, in all the relevant cases.
+ # Setting indexes to an empty string means that they will be
+ # omitted if they would otherwise appear in URLs. It just so
+ # happens that this is the right thing to do in the standard
+ # UI, in all the relevant cases.
$this->mPastTheEndIndex = '';
$res->seek( $numRows - 1 );
$row = $res->fetchRow();
}
/**
- * Do a query with specified parameters, rather than using the object context
+ * Do a query with specified parameters, rather than using the object
+ * context
*
* @param string $offset Index offset, inclusive
* @param integer $limit Exact query limit
* @param boolean $descending Query direction, false for ascending, true for descending
* @return ResultWrapper
*/
- function reallyDoQuery( $offset, $limit, $ascending ) {
+ function reallyDoQuery( $offset, $limit, $descending ) {
$fname = __METHOD__ . ' (' . get_class( $this ) . ')';
$info = $this->getQueryInfo();
$tables = $info['tables'];
$fields = $info['fields'];
$conds = isset( $info['conds'] ) ? $info['conds'] : array();
$options = isset( $info['options'] ) ? $info['options'] : array();
- if ( $ascending ) {
+ if ( $descending ) {
$options['ORDER BY'] = $this->mIndexField;
$operator = '>';
} else {
return new ResultWrapper( $this->mDb, $res );
}
+ /**
+ * Pre-process results; useful for performing batch existence checks, etc.
+ *
+ * @param ResultWrapper $result Result wrapper
+ */
+ protected function preprocessResults( $result ) {}
+
/**
* Get the formatted result list. Calls getStartBody(), formatRow() and
* getEndBody(), concatenates the results and returns them.
}
/**
- * Get paging links. If a link is disabled, the item from $disabledTexts will
- * be used. If there is no such item, the unlinked text from $linkTexts will
- * be used. Both $linkTexts and $disabledTexts are arrays of HTML.
+ * Get paging links. If a link is disabled, the item from $disabledTexts
+ * will be used. If there is no such item, the unlinked text from
+ * $linkTexts will be used. Both $linkTexts and $disabledTexts are arrays
+ * of HTML.
*/
function getPagingLinks( $linkTexts, $disabledTexts = array() ) {
$queries = $this->getPagingQueries();
/**
* IndexPager with an alphabetic list and a formatted navigation bar
-*/
+ * @addtogroup Pager
+ */
abstract class AlphabeticPager extends IndexPager {
public $mDefaultDirection = false;
*/
function getNavigationBar() {
global $wgLang;
-
+
$linkTexts = array(
- 'prev' => wfMsgHtml( "prevn", $this->mLimit ),
- 'next' => wfMsgHtml( 'nextn', $this->mLimit ),
- 'first' => wfMsgHtml('first'), /* Introduced the message */
- 'last' => wfMsgHtml( 'last' )
+ 'prev' => wfMsgHtml( 'prevn', $wgLang->formatNum( $this->mLimit ) ),
+ 'next' => wfMsgHtml( 'nextn', $wgLang->formatNum($this->mLimit ) ),
+ 'first' => wfMsgHtml( 'page_first' ), /* Introduced the message */
+ 'last' => wfMsgHtml( 'page_last' ) /* Introduced the message */
);
-
+
$pagingLinks = $this->getPagingLinks( $linkTexts );
$limitLinks = $this->getLimitLinks();
$limits = implode( ' | ', $limitLinks );
-
+
$this->mNavigationBar = "({$pagingLinks['first']} | {$pagingLinks['last']}) " . wfMsgHtml("viewprevnext", $pagingLinks['prev'], $pagingLinks['next'], $limits);
return $this->mNavigationBar;
-
+
}
}
/**
* IndexPager with a formatted navigation bar
+ * @addtogroup Pager
*/
abstract class ReverseChronologicalPager extends IndexPager {
public $mDefaultDirection = true;
if ( isset( $this->mNavigationBar ) ) {
return $this->mNavigationBar;
}
+ $nicenumber = $wgLang->formatNum( $this->mLimit );
$linkTexts = array(
- 'prev' => wfMsgHtml( "prevn", $this->mLimit ),
- 'next' => wfMsgHtml( 'nextn', $this->mLimit ),
- 'first' => wfMsgHtml('histlast'),
+ 'prev' => wfMsgExt( 'pager-newer-n', array( 'parsemag' ), $nicenumber ),
+ 'next' => wfMsgExt( 'pager-older-n', array( 'parsemag' ), $nicenumber ),
+ 'first' => wfMsgHtml( 'histlast' ),
'last' => wfMsgHtml( 'histfirst' )
);
$pagingLinks = $this->getPagingLinks( $linkTexts );
$limitLinks = $this->getLimitLinks();
$limits = implode( ' | ', $limitLinks );
-
- $this->mNavigationBar = "({$pagingLinks['first']} | {$pagingLinks['last']}) " . wfMsgHtml("viewprevnext", $pagingLinks['prev'], $pagingLinks['next'], $limits);
+
+ $this->mNavigationBar = "({$pagingLinks['first']} | {$pagingLinks['last']}) " .
+ wfMsgHtml("viewprevnext", $pagingLinks['prev'], $pagingLinks['next'], $limits);
return $this->mNavigationBar;
}
}
/**
* Table-based display with a user-selectable sort order
+ * @addtogroup Pager
*/
abstract class TablePager extends IndexPager {
var $mSort;
}
/**
- * Return true if the named field should be sortable by the UI, false otherwise
+ * Return true if the named field should be sortable by the UI, false
+ * otherwise
+ *
* @param string $field
*/
abstract function isFieldSortable( $field );
/**
- * Format a table cell. The return value should be HTML, but use an empty string
- * not for empty cells. Do not include the <td> and </td>.
+ * Format a table cell. The return value should be HTML, but use an empty
+ * string not for empty cells. Do not include the <td> and </td>.
+ *
+ * The current result row is available as $this->mCurrentRow, in case you
+ * need more context.
*
* @param string $name The database field name
* @param string $value The value retrieved from the database
- *
- * The current result row is available as $this->mCurrentRow, in case you need
- * more context.
*/
abstract function formatValue( $name, $value );
abstract function getDefaultSort();
/**
- * An array mapping database field names to a textual description of the field
- * name, for use in the table header. The description should be plain text, it
- * will be HTML-escaped later.
+ * An array mapping database field names to a textual description of the
+ * field name, for use in the table header. The description should be plain
+ * text, it will be HTML-escaped later.
*/
abstract function getFieldNames();
}
-?>
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