[392503] Provide a convenient CDODirtyStateAdapter drops/I20121020-0730

https://bugs.eclipse.org/bugs/show_bug.cgi?id=392503

1 files changed, 49 insertions, 0 deletions

diff --git a/plugins/org.eclipse.emf.cdo/src/org/eclipse/emf/cdo/view/CDODirtyStateAdapter.java b/plugins/org.eclipse.emf.cdo/src/org/eclipse/emf/cdo/view/CDODirtyStateAdapter.java
new file mode 100644
index 0000000000..9af677e70f
--- /dev/null
+++ b/plugins/org.eclipse.emf.cdo/src/org/eclipse/emf/cdo/view/CDODirtyStateAdapter.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Eike Stepper - initial API and implementation
+ */
+package org.eclipse.emf.cdo.view;
+
+import org.eclipse.emf.cdo.transaction.CDOTransactionFinishedEvent;
+import org.eclipse.emf.cdo.transaction.CDOTransactionStartedEvent;
+
+import org.eclipse.net4j.util.event.IEvent;
+import org.eclipse.net4j.util.event.IListener;
+
+/**
+ * A {@link IListener listener} that calls the {@link #onDirtyStateChanged(boolean)} method when the {@link CDOView#isDirty() dirty} state
+ * of the {@link CDOView view} this listener is {@link CDOView#addListener(IListener) registered} with has changed.
+ *
+ * @author Eike Stepper
+ * @since 4.2
+ */
+public abstract class CDODirtyStateAdapter implements IListener
+{
+  public void notifyEvent(IEvent event)
+  {
+    if (event instanceof CDOTransactionStartedEvent)
+    {
+      onDirtyStateChanged(true);
+    }
+    else if (event instanceof CDOTransactionFinishedEvent)
+    {
+      onDirtyStateChanged(false);
+    }
+    else
+    {
+      notifyOtherEvent(event);
+    }
+  }
+
+  protected void notifyOtherEvent(IEvent event)
+  {
+  }
+
+  protected abstract void onDirtyStateChanged(boolean dirty);
+}