1 files changed, 84 insertions, 0 deletions
diff --git a/plugins/org.eclipse.oomph.util/src/org/eclipse/oomph/util/SuppressHint.java b/plugins/org.eclipse.oomph.util/src/org/eclipse/oomph/util/SuppressHint.java
new file mode 100644
index 000000000..5aebf8f74
--- /dev/null
+++ b/plugins/org.eclipse.oomph.util/src/org/eclipse/oomph/util/SuppressHint.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2015 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.oomph.util;
+
+import org.eclipse.emf.common.notify.Adapter;
+import org.eclipse.emf.common.notify.Notifier;
+import org.eclipse.emf.common.notify.impl.AdapterImpl;
+import org.eclipse.emf.common.util.EList;
+
+import java.util.Iterator;
+
+/**
+ * An instance of this {@link Adapter} attached to a {@link Notifier} serves as a hint that the notifier should be suppressed from the UI.
+ *
+ * @author Eike Stepper
+ */
+public class SuppressHint extends AdapterImpl
+{
+  public static final SuppressHint INSTANCE = new SuppressHint();
+
+  protected SuppressHint()
+  {
+  }
+
+  public static boolean isSuppressed(Object object)
+  {
+    if (object instanceof Notifier)
+    {
+      Notifier notifier = (Notifier)object;
+      EList<Adapter> adapters = notifier.eAdapters();
+
+      for (Adapter adapter : adapters)
+      {
+        if (adapter instanceof SuppressHint)
+        {
+          return true;
+        }
+      }
+    }
+
+    return false;
+  }
+
+  public static void setSuppressed(Object object, boolean suppressed)
+  {
+    if (object instanceof Notifier)
+    {
+      Notifier notifier = (Notifier)object;
+      EList<Adapter> adapters = notifier.eAdapters();
+
+      if (suppressed)
+      {
+        for (Adapter adapter : notifier.eAdapters())
+        {
+          if (adapter instanceof SuppressHint)
+          {
+            return;
+          }
+        }
+
+        adapters.add(INSTANCE);
+      }
+      else
+      {
+        for (Iterator<Adapter> it = adapters.iterator(); it.hasNext();)
+        {
+          Adapter adapter = it.next();
+          if (adapter instanceof SuppressHint)
+          {
+            it.remove();
+          }
+        }
+      }
+    }
+  }
+}