synchronize getChangeset method of hook events and call registered pre processors before the changesets are returned to hook

scm-core/src/main/java/sonia/scm/repository/AbstractRepositoryManager.java

@@ -177,6 +177,9 @@ public abstract class AbstractRepositoryManager implements RepositoryManager
     AssertUtil.assertIsNotNull(event.getType());
     event.setRepository(repository);
 
+    // prepare the event
+    event = prepareHookEvent(event);
+
     // post wrapped hook to event system
     ScmEventBus.getInstance().post(WrappedRepositoryHookEvent.wrap(event));
 
@@ -246,6 +249,20 @@ public abstract class AbstractRepositoryManager implements RepositoryManager
     ScmEventBus.getInstance().post(new RepositoryEvent(repository, event));
   }
 
+  /**
+   * Prepare a hook event before it is fired to the event system of SCM-Manager.
+   *
+   *
+   * @param event hook event
+   * @since 1.26
+   *
+   * @return
+   */
+  protected RepositoryHookEvent prepareHookEvent(RepositoryHookEvent event)
+  {
+    return event;
+  }
+
   //~--- fields ---------------------------------------------------------------
 
   /** repository hooks map */