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<?php
/**
* Class representing a list of titles
* The execute() method checks them all for existence and adds them to a LinkCache object
*
* @ingroup Cache
*/
class LinkBatch {
/**
* 2-d array, first index namespace, second index dbkey, value arbitrary
*/
var $data = array();
/**
* For debugging which method is using this class.
*/
protected $caller;
function __construct( $arr = array() ) {
foreach( $arr as $item ) {
$this->addObj( $item );
}
}
/**
* Use ->setCaller( __METHOD__ ) to indicate which code is using this
* class. Only used in debugging output.
* @since 1.17
*/
public function setCaller( $caller ) {
$this->caller = $caller;
}
public function addObj( $title ) {
if ( is_object( $title ) ) {
$this->add( $title->getNamespace(), $title->getDBkey() );
} else {
wfDebug( "Warning: LinkBatch::addObj got invalid title object\n" );
}
}
public function add( $ns, $dbkey ) {
if ( $ns < 0 ) {
return;
}
if ( !array_key_exists( $ns, $this->data ) ) {
$this->data[$ns] = array();
}
$this->data[$ns][str_replace( ' ', '_', $dbkey )] = 1;
}
/**
* Set the link list to a given 2-d array
* First key is the namespace, second is the DB key, value arbitrary
*/
public function setArray( $array ) {
$this->data = $array;
}
/**
* Returns true if no pages have been added, false otherwise.
*/
public function isEmpty() {
return ($this->getSize() == 0);
}
/**
* Returns the size of the batch.
*/
public function getSize() {
return count( $this->data );
}
/**
* Do the query and add the results to the LinkCache object
* Return an array mapping PDBK to ID
*/
public function execute() {
$linkCache = LinkCache::singleton();
return $this->executeInto( $linkCache );
}
/**
* Do the query and add the results to a given LinkCache object
* Return an array mapping PDBK to ID
*/
protected function executeInto( &$cache ) {
wfProfileIn( __METHOD__ );
$res = $this->doQuery();
$ids = $this->addResultToCache( $cache, $res );
wfProfileOut( __METHOD__ );
return $ids;
}
/**
* Add a ResultWrapper containing IDs and titles to a LinkCache object.
* As normal, titles will go into the static Title cache field.
* This function *also* stores extra fields of the title used for link
* parsing to avoid extra DB queries.
*/
public function addResultToCache( $cache, $res ) {
if ( !$res ) {
return array();
}
// For each returned entry, add it to the list of good links, and remove it from $remaining
$ids = array();
$remaining = $this->data;
foreach ( $res as $row ) {
$title = Title::makeTitle( $row->page_namespace, $row->page_title );
$cache->addGoodLinkObj( $row->page_id, $title, $row->page_len, $row->page_is_redirect, $row->page_latest );
$ids[$title->getPrefixedDBkey()] = $row->page_id;
unset( $remaining[$row->page_namespace][$row->page_title] );
}
// The remaining links in $data are bad links, register them as such
foreach ( $remaining as $ns => $dbkeys ) {
foreach ( $dbkeys as $dbkey => $unused ) {
$title = Title::makeTitle( $ns, $dbkey );
$cache->addBadLinkObj( $title );
$ids[$title->getPrefixedDBkey()] = 0;
}
}
return $ids;
}
/**
* Perform the existence test query, return a ResultWrapper with page_id fields
*/
public function doQuery() {
if ( $this->isEmpty() ) {
return false;
}
wfProfileIn( __METHOD__ );
// This is similar to LinkHolderArray::replaceInternal
$dbr = wfGetDB( DB_SLAVE );
$table = 'page';
$fields = array( 'page_id', 'page_namespace', 'page_title', 'page_len',
'page_is_redirect', 'page_latest' );
$conds = $this->constructSet( 'page', $dbr );
// Do query
$caller = __METHOD__;
if ( strval( $this->caller ) !== '' ) {
$caller .= " (for {$this->caller})";
}
$res = $dbr->select( $table, $fields, $conds, $caller );
wfProfileOut( __METHOD__ );
return $res;
}
/**
* Construct a WHERE clause which will match all the given titles.
*
* @param $prefix String: the appropriate table's field name prefix ('page', 'pl', etc)
* @param $db DatabaseBase object to use
* @return mixed string with SQL where clause fragment, or false if no items.
*/
public function constructSet( $prefix, $db ) {
return $db->makeWhereFrom2d( $this->data, "{$prefix}_namespace", "{$prefix}_title" );
}
}
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