From 183851b06bd6c52f3cae5375f433da720d410447 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Wed, 11 Oct 2006 18:12:39 +0000
Subject: MediaWiki 1.7.1 wiederhergestellt

---
 includes/LinkBatch.php | 184 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 includes/LinkBatch.php

(limited to 'includes/LinkBatch.php')

diff --git a/includes/LinkBatch.php b/includes/LinkBatch.php
new file mode 100644
index 00000000..e0f0f6fd
--- /dev/null
+++ b/includes/LinkBatch.php
@@ -0,0 +1,184 @@
+<?php
+
+/**
+ * Class representing a list of titles
+ * The execute() method checks them all for existence and adds them to a LinkCache object
+ +
+ * @package MediaWiki
+ * @subpackage Cache
+ */
+class LinkBatch {
+	/**
+	 * 2-d array, first index namespace, second index dbkey, value arbitrary
+	 */
+	var $data = array();
+
+	function LinkBatch( $arr = array() ) {
+		foreach( $arr as $item ) {
+			$this->addObj( $item );
+		}
+	}
+
+	function addObj( $title ) {
+		if ( is_object( $title ) ) {
+			$this->add( $title->getNamespace(), $title->getDBkey() );
+		} else {
+			wfDebug( "Warning: LinkBatch::addObj got invalid title object\n" );
+		}
+	}
+
+	function add( $ns, $dbkey ) {
+		if ( $ns < 0 ) {
+			return;
+		}
+		if ( !array_key_exists( $ns, $this->data ) ) {
+			$this->data[$ns] = array();
+		}
+
+		$this->data[$ns][$dbkey] = 1;
+	}
+
+	/**
+	 * Set the link list to a given 2-d array
+	 * First key is the namespace, second is the DB key, value arbitrary
+	 */
+	function setArray( $array ) {
+		$this->data = $array;
+	}
+
+	/**
+	 * Returns true if no pages have been added, false otherwise.
+	 */
+	function isEmpty() {
+		return ($this->getSize() == 0);
+	}
+
+	/**
+	 * Returns the size of the batch.
+	 */
+	function getSize() {
+		return count( $this->data );
+	}
+
+	/**
+	 * Do the query and add the results to the LinkCache object
+	 * Return an array mapping PDBK to ID
+	 */
+	 function execute() {
+	 	$linkCache =& LinkCache::singleton();
+	 	$this->executeInto( $linkCache );
+	 }
+
+	/**
+	 * Do the query and add the results to a given LinkCache object
+	 * Return an array mapping PDBK to ID
+	 */
+	function executeInto( &$cache ) {
+		$fname = 'LinkBatch::executeInto';
+		wfProfileIn( $fname );
+		// Do query
+		$res = $this->doQuery();
+		if ( !$res ) {
+			wfProfileOut( $fname );
+			return array();
+		}
+
+		// For each returned entry, add it to the list of good links, and remove it from $remaining
+
+		$ids = array();
+		$remaining = $this->data;
+		while ( $row = $res->fetchObject() ) {
+			$title = Title::makeTitle( $row->page_namespace, $row->page_title );
+			$cache->addGoodLinkObj( $row->page_id, $title );
+			$ids[$title->getPrefixedDBkey()] = $row->page_id;
+			unset( $remaining[$row->page_namespace][$row->page_title] );
+		}
+		$res->free();
+
+		// The remaining links in $data are bad links, register them as such
+		foreach ( $remaining as $ns => $dbkeys ) {
+			foreach ( $dbkeys as $dbkey => $nothing ) {
+				$title = Title::makeTitle( $ns, $dbkey );
+				$cache->addBadLinkObj( $title );
+				$ids[$title->getPrefixedDBkey()] = 0;
+			}
+		}
+		wfProfileOut( $fname );
+		return $ids;
+	}
+
+	/**
+	 * Perform the existence test query, return a ResultWrapper with page_id fields
+	 */
+	function doQuery() {
+		$fname = 'LinkBatch::doQuery';
+		$namespaces = array();
+
+		if ( $this->isEmpty() ) {
+			return false;
+		}
+		wfProfileIn( $fname );
+
+		// Construct query
+		// This is very similar to Parser::replaceLinkHolders
+		$dbr =& wfGetDB( DB_SLAVE );
+		$page = $dbr->tableName( 'page' );
+		$set = $this->constructSet( 'page', $dbr );
+		if ( $set === false ) {
+			wfProfileOut( $fname );
+			return false;
+		}
+		$sql = "SELECT page_id, page_namespace, page_title FROM $page WHERE $set";
+
+		// Do query
+		$res = new ResultWrapper( $dbr,  $dbr->query( $sql, $fname ) );
+		wfProfileOut( $fname );
+		return $res;
+	}
+
+	/**
+	 * Construct a WHERE clause which will match all the given titles.
+	 * Give the appropriate table's field name prefix ('page', 'pl', etc).
+	 *
+	 * @param $prefix String: ??
+	 * @return string
+	 * @public
+	 */
+	function constructSet( $prefix, &$db ) {
+		$first = true;
+		$firstTitle = true;
+		$sql = '';
+		foreach ( $this->data as $ns => $dbkeys ) {
+			if ( !count( $dbkeys ) ) {
+				continue;
+			}
+
+			if ( $first ) {
+				$first = false;
+			} else {
+				$sql .= ' OR ';
+			}
+			$sql .= "({$prefix}_namespace=$ns AND {$prefix}_title IN (";
+
+			$firstTitle = true;
+			foreach( $dbkeys as $dbkey => $nothing ) {
+				if ( $firstTitle ) {
+					$firstTitle = false;
+				} else {
+					$sql .= ',';
+				}
+				$sql .= $db->addQuotes( $dbkey );
+			}
+
+			$sql .= '))';
+		}
+		if ( $first && $firstTitle ) {
+			# No titles added
+			return false;
+		} else {
+			return $sql;
+		}
+	}
+}
+
+?>
-- 
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