import/export: Add documentation for nullable arguments

Change-Id: Id8e4553a054a36011433d5705c699d1c2730456e

includes/export/DumpFilter.php

@@ -63,7 +63,7 @@ class DumpFilter {
 	}
 
 	/**
-	 * @param stdClass $page
+	 * @param stdClass|null $page
 	 * @param string $string
 	 */
 	public function writeOpenPage( $page, $string ) {
@@ -84,7 +84,7 @@ class DumpFilter {
 	}
 
 	/**
-	 * @param stdClass $rev
+	 * @param stdClass|null $rev
 	 * @param string $string
 	 */
 	public function writeRevision( $rev, $string ) {
@@ -127,7 +127,7 @@ class DumpFilter {
 
 	/**
 	 * Override for page-based filter types.
-	 * @param stdClass $page
+	 * @param stdClass|null $page
 	 * @return bool
 	 */
 	protected function pass( $page ) {

includes/export/DumpOutput.php

@@ -43,7 +43,7 @@ class DumpOutput {
 	}
 
 	/**
-	 * @param stdClass $page
+	 * @param stdClass|null $page
 	 * @param string $string
 	 */
 	public function writeOpenPage( $page, $string ) {
@@ -58,7 +58,7 @@ class DumpOutput {
 	}
 
 	/**
-	 * @param stdClass $rev
+	 * @param stdClass|null $rev
 	 * @param string $string
 	 */
 	public function writeRevision( $rev, $string ) {

includes/export/WikiExporter.php

@@ -511,7 +511,7 @@ class WikiExporter {
 	 * and be sorted/grouped by page and revision to avoid duplicate page records in the output.
 	 *
 	 * @param IResultWrapper $results
-	 * @param stdClass $lastRow the last row output from the previous call (or null if none)
+	 * @param stdClass|null $lastRow the last row output from the previous call (or null if none)
 	 * @return stdClass the last row processed
 	 */
 	protected function outputPageStreamBatch( $results, $lastRow ) {

includes/import/WikiImporter.php

@@ -53,16 +53,16 @@ class WikiImporter {
 	/** @var callable */
 	private $mUploadCallback;
 
-	/** @var callable */
+	/** @var callable|null */
 	private $mRevisionCallback;
 
-	/** @var callable */
+	/** @var callable|null */
 	private $mPageCallback;
 
 	/** @var callable|null */
 	private $mSiteInfoCallback;
 
-	/** @var callable */
+	/** @var callable|null */
 	private $mPageOutCallback;
 
 	/** @var callable|null */
@@ -284,8 +284,8 @@ class WikiImporter {
 
 	/**
 	 * Sets the action to perform as each new page in the stream is reached.
-	 * @param callable $callback
-	 * @return callable
+	 * @param callable|null $callback
+	 * @return callable|null
 	 */
 	public function setPageCallback( $callback ) {
 		$previous = $this->mPageCallback;
@@ -299,8 +299,8 @@ class WikiImporter {
 	 * with the original title form (in case it's been overridden into a
 	 * local namespace), and a count of revisions.
 	 *
-	 * @param callable $callback
-	 * @return callable
+	 * @param callable|null $callback
+	 * @return callable|null
 	 */
 	public function setPageOutCallback( $callback ) {
 		$previous = $this->mPageOutCallback;
@@ -310,8 +310,8 @@ class WikiImporter {
 
 	/**
 	 * Sets the action to perform as each page revision is reached.
-	 * @param callable $callback
-	 * @return callable
+	 * @param callable|null $callback
+	 * @return callable|null
 	 */
 	public function setRevisionCallback( $callback ) {
 		$previous = $this->mRevisionCallback;