Merge "HTMLFormField: Use 'align' => 'top' when wrapping legacy stuff in OOUI FieldLa...

[lhc/web/wiklou.git] / includes / content / ContentHandler.php

diff --git a/includes/content/ContentHandler.php b/includes/content/ContentHandler.php
index 76f2a7b..acaa288 100644 (file)
--- a/includes/content/ContentHandler.php
+++ b/includes/content/ContentHandler.php
@@ -33,6 +33,32 @@
 class MWContentSerializationException extends MWException {
 }
 
+/**
+ * Exception thrown when an unregistered content model is requested. This error
+ * can be triggered by user input, so a separate exception class is provided so
+ * callers can substitute a context-specific, internationalised error message.
+ *
+ * @ingroup Content
+ * @since 1.27
+ */
+class MWUnknownContentModelException extends MWException {
+       /** @var string The name of the unknown content model */
+       private $modelId;
+
+       /** @param string $modelId */
+       function __construct( $modelId ) {
+               parent::__construct( "The content model '$modelId' is not registered on this wiki.\n" .
+                       'See https://www.mediawiki.org/wiki/Content_handlers to find out which extensions ' .
+                       'handle this content model.' );
+               $this->modelId = $modelId;
+       }
+
+       /** @return string */
+       public function getModelId() {
+               return $modelId;
+       }
+}
+
 /**
  * A content handler knows how do deal with a specific type of content on a wiki
  * page. Content is stored in the database in a serialized form (using a
@@ -307,7 +333,8 @@ abstract class ContentHandler {
         * @param string $modelId The ID of the content model for which to get a
         *    handler. Use CONTENT_MODEL_XXX constants.
         *
-        * @throws MWException If no handler is known for the model ID.
+        * @throws MWException For internal errors and problems in the configuration.
+        * @throws MWUnknownContentModelException If no handler is known for the model ID.
         * @return ContentHandler The ContentHandler singleton for handling the model given by the ID.
         */
        public static function getForModelID( $modelId ) {
@@ -323,7 +350,7 @@ abstract class ContentHandler {
                        Hooks::run( 'ContentHandlerForModelID', array( $modelId, &$handler ) );
 
                        if ( $handler === null ) {
-                               throw new MWException( "No handler for model '$modelId' registered in \$wgContentHandlers" );
+                               throw new MWUnknownContentModelException( $modelId );
                        }
 
                        if ( !( $handler instanceof ContentHandler ) ) {