1 files changed, 79 insertions, 0 deletions
diff --git a/extraplugins/layers/org.eclipse.papyrus.layers.stackmodel/src/org/eclipse/papyrus/layers/stackmodel/layers/util/ECoreUtils.java b/extraplugins/layers/org.eclipse.papyrus.layers.stackmodel/src/org/eclipse/papyrus/layers/stackmodel/layers/util/ECoreUtils.java
new file mode 100644
index 00000000000..5d16381d792
--- /dev/null
+++ b/extraplugins/layers/org.eclipse.papyrus.layers.stackmodel/src/org/eclipse/papyrus/layers/stackmodel/layers/util/ECoreUtils.java
@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2013 CEA LIST.
+ * 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:
+ *     Cedric Dumoulin - cedric.dumoulin@lifl.fr
+ ******************************************************************************/
+package org.eclipse.papyrus.layers.stackmodel.layers.util;
+
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.papyrus.layers.stackmodel.NotFoundException;
+
+
+/**
+ * @author cedric dumoulin
+ *
+ */
+public class ECoreUtils {
+
+	/**
+	 * Check if one of the ancestor is instance of the specified type.
+	 * Ancestors are classes that contains this class
+	 * @param child Child for which we want to check the ancestor's type
+	 * @param type The expected type
+	 * @return true if one of the ancestor is of the expected type. False otherwise.
+	 */
+	public static boolean isAncestorInstanceOf(EObject child, EClass type) {
+
+
+		try {
+			lookupAncestorOfType(child, type);
+			return true;
+		} catch (NotFoundException e) {
+			return false;
+		}
+		    
+	}
+	
+	/**
+	 * Lookup if one of the ancestor is instance of the specified type.
+	 * Ancestors are classes that contains this class
+	 * @param child Child for which we want to check the ancestor's type
+	 * @param type The expected type
+	 * @return the first ancestor of the specified type.
+	 * @throws NotFoundException If no ancestor is found.
+	 */
+	public static EObject lookupAncestorOfType(EObject child, EClass type) throws NotFoundException {
+		    if (child != null)
+		    {
+		    	if( type.isInstance(child)) {
+		    		return child;
+		    	}
+
+		    	int count = 0;
+		      for (EObject parent = child.eContainer(); parent != null; parent = parent.eContainer())
+		      {
+		        if (++count > 100000)
+		        {
+		          return lookupAncestorOfType(child, type);
+		        }
+		        // Check if this is the correct type
+		        if( type.isInstance(parent)) {
+		        	return parent;
+		        }
+		        if (parent == child)
+		        {
+		          throw new IllegalStateException("There is a cycle in the containment hierarchy of " + child);
+		        }
+		      }
+		    }
+		    //Nothing found
+		    throw new NotFoundException("No ancestor of the specified type"	);
+
+	}
+}