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< import CH.ifa.draw.framework.*;
< import java.util.*;
---
> import java.util.List;
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>  * @author  Wolfram Kaiser <mrfloppy@sourceforge.net>
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< 	private Vector redoStack;
---
> 	private List redoStack;
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< 	private Vector undoStack;
---
> 	private List undoStack;
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< 		undoStack = new Vector(maxStackCapacity);
< 		redoStack = new Vector(maxStackCapacity);
---
> 		undoStack = CollectionsFactory.current().createList(maxStackCapacity);
> 		redoStack = CollectionsFactory.current().createList(maxStackCapacity);
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< 			// If buffersize exceeds, remove the oldest command
< 			if (getUndoSize() >= maxStackCapacity) {
< 				undoStack.removeElementAt(0);
< 			}
< 		
< 			undoStack.addElement(undoActivity);
---
> 			removeFirstElementInFullList(undoStack);
> 			undoStack.add(undoActivity);
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< 			undoStack = new Vector(maxStackCapacity);
---
> 			undoStack = CollectionsFactory.current().createList(maxStackCapacity);
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< 			// If buffersize exceeds, remove the oldest command
< 			if (getRedoSize() >= maxStackCapacity) {
< 				redoStack.removeElementAt(0);
< 			}
---
> 
> 			removeFirstElementInFullList(redoStack);
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< 				redoStack.addElement(redoActivity);
---
> 				redoStack.add(redoActivity);
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< 			redoStack = new Vector(maxStackCapacity);
---
> 			redoStack = CollectionsFactory.current().createList(maxStackCapacity);
> 		}
> 	}
> 
> 	/**
> 	 * If buffersize exceeds, remove the oldest command
> 	 */
> 	private void removeFirstElementInFullList(List l) {
> 		if (l.size() >= maxStackCapacity) {
> 			l.remove(0);
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> 	private Undoable getLastElement(List l) {
> 		if (l.size() > 0) {
> 			return (Undoable)l.get(l.size() - 1);
> 		}
> 		else {
> 			return null;
> 		}
> 	}
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< 			return ((Undoable)undoStack.lastElement()).isUndoable();
---
> 			return getLastElement(undoStack).isUndoable();
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< 			return ((Undoable)redoStack.lastElement()).isRedoable();
---
> 			return getLastElement(redoStack).isRedoable();
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< 			return (Undoable) undoStack.lastElement();
---
> 			return getLastElement(undoStack);
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< 			return (Undoable) redoStack.lastElement();
---
> 			return getLastElement(redoStack);
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< 		undoStack.removeElementAt(getUndoSize() - 1);
---
> 		undoStack.remove(getUndoSize() - 1);
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< 		redoStack.removeElementAt(getRedoSize() - 1);
---
> 		redoStack.remove(getRedoSize() - 1);
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< 	protected void clearStack(Vector clearStack) {
< 		clearStack.removeAllElements();
---
> 	protected void clearStack(List clearStack) {
> 		clearStack.clear();