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/*******************************************************************************
* 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" );
}
}
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