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/*****************************************************************************
* Copyright (c) 2012 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:
* Vincent Lorenzo (CEA LIST) Vincent.Lorenzo@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.uml.compare.merger.utils;
import java.util.Comparator;
import java.util.Iterator;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.ecore.EObject;
/**
*
* This class allows to compare EObject using the PositionAdapter.
*
*
*/
public class EObjectComparator<T> implements Comparator<T> {
/**
*
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*
* @param o1
* @param o2
* @return
*/
public int compare(final T o1, final T o2) {
if(o1 instanceof EObject && o2 instanceof EObject) {
final int position1 = getWantedPosition((EObject)o1);
final int position2 = getWantedPosition((EObject)o2);
if(position1 != -1 && position2 != -1) {
return position1 - position2;
}
}
return 0;
}
/**
*
* @param obj1
* an EObject
* @return
* the wanted position for this object
*/
private int getWantedPosition(final EObject obj1) {
final Iterator<Adapter> adapters = obj1.eAdapters().iterator();
int expectedIndex = -1;
while(expectedIndex == -1 && adapters.hasNext()) {
final Adapter adapter = adapters.next();
if(adapter instanceof PositionAdapter) {
expectedIndex = ((PositionAdapter)adapter).getExpectedIndex();
}
}
return expectedIndex;
}
}
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