perf: replace recursion with iteration

Author: rubenporras

com.avaloq.tools.ddk.xtext/src/com/avaloq/tools/ddk/xtext/resource/persistence/ProxyCompositeNode.java

@@ -13,6 +13,7 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Stack;
 
 import org.eclipse.emf.common.notify.Adapter;
 import org.eclipse.emf.common.notify.Notification;
@@ -87,17 +88,23 @@ static void installProxyNodeModel(final Resource resource) {
   }
 
   private static ProxyCompositeNode installProxyNodeModel(final EObject eObject, final List<EObject> map) {
-    ProxyCompositeNode result = new ProxyCompositeNode();
-    eObject.eAdapters().add(result);
+    Stack<EObject> stack = new Stack<>(); // NOPMD LooseCoupling
+    stack.push(eObject);
+    ProxyCompositeNode rootComposite = new ProxyCompositeNode();
+    eObject.eAdapters().add(rootComposite);
     map.add(eObject);
 
-    for (FeatureIterator<EObject> it = (FeatureIterator<EObject>) eObject.eContents().iterator(); it.hasNext();) {
-      EObject child = it.next();
-      if (!it.feature().isTransient()) {
-        installProxyNodeModel(child, map);
+    while (!stack.isEmpty()) {
+      for (FeatureIterator<EObject> it = (FeatureIterator<EObject>) stack.pop().eContents().reversed().iterator(); it.hasNext();) {
+        EObject child = it.next();
+        if (!it.feature().isTransient()) {
+          child.eAdapters().add(new ProxyCompositeNode());
+          map.add(child);
+          stack.push(child);
+        }
       }
     }
-    return result;
+    return rootComposite;
   }
 
   /**