[213420] Speed up handling of ManyReferences in DBStoreAccessor

https://bugs.eclipse.org/bugs/show_bug.cgi?id=213420

1 files changed, 63 insertions, 0 deletions

diff --git a/plugins/org.eclipse.emf.cdo.edit/src/org/eclipse/emf/cdo/edit/CDOItemProviderAdapter.java b/plugins/org.eclipse.emf.cdo.edit/src/org/eclipse/emf/cdo/edit/CDOItemProviderAdapter.java
new file mode 100644
index 0000000000..c2ed9c7855
--- /dev/null
+++ b/plugins/org.eclipse.emf.cdo.edit/src/org/eclipse/emf/cdo/edit/CDOItemProviderAdapter.java
@@ -0,0 +1,63 @@
+/***************************************************************************
+ * Copyright (c) 2004 - 2007 Eike Stepper, Germany.
+ * 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.edit;
+
+import org.eclipse.emf.common.notify.AdapterFactory;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EStructuralFeature;
+import org.eclipse.emf.edit.provider.ItemProviderAdapter;
+
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * @author Eike Stepper
+ */
+public class CDOItemProviderAdapter extends ItemProviderAdapter
+{
+  public CDOItemProviderAdapter(AdapterFactory adapterFactory)
+  {
+    super(adapterFactory);
+  }
+
+  @Override
+  @SuppressWarnings("deprecation")
+  public boolean hasChildren(Object object)
+  {
+    Collection<? extends EStructuralFeature> anyChildrenFeatures = getChildrenFeatures(object);
+    if (anyChildrenFeatures.isEmpty())
+    {
+      anyChildrenFeatures = getChildrenReferences(object);
+    }
+
+    EObject eObject = (EObject)object;
+    for (EStructuralFeature feature : anyChildrenFeatures)
+    {
+      if (feature.isMany())
+      {
+        List<?> children = (List<?>)eObject.eGet(feature);
+        if (!children.isEmpty())
+        {
+          return true;
+        }
+      }
+      else
+      {
+        if (eObject.eIsSet(feature))
+        {
+          return true;
+        }
+      }
+    }
+
+    return false;
+  }
+}