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/* *******************************************************************
* Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
* 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:
* PARC initial implementation
* ******************************************************************/
package answers;
import figures.Group;
import figures.FigureElement;
public aspect Answer2c {
before(FigureElement newValue, Group g):
call(void Group.add(FigureElement))
&& args(newValue)
&& target(g) {
if (newValue == null) {
throw new IllegalArgumentException("null not allowed");
}
if (newValue == g) {
throw new IllegalArgumentException("self not allowed");
}
}
}
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