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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:
* Ansgar Radermacher ansgar.radermacher@cea.fr
*
*****************************************************************************/
package org.eclipse.papyrus.qompass.designer.validation.constraints;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.emf.validation.AbstractModelConstraint;
import org.eclipse.emf.validation.IValidationContext;
import org.eclipse.papyrus.FCM.DerivedElement;
import org.eclipse.papyrus.uml.tools.utils.StereotypeUtil;
import org.eclipse.uml2.uml.Operation;
import org.eclipse.uml2.uml.Parameter;
import org.eclipse.uml2.uml.ParameterDirectionKind;
/**
* Verify that an operation has at most one return parameter
*
* Whereas this rule would make sense in general, it has been made specific to
* Qompass by verifying whether FCM is applied (check if DerivedElement stereotype
* is applicable)
*/
public class OperationsWithTwoReturnValues extends AbstractModelConstraint
{
@Override
public IStatus validate (IValidationContext ctx)
{
Operation operation = (Operation) ctx.getTarget();
boolean firstReturn = true;
for (Parameter parameter : operation.getOwnedParameters ()) {
if (parameter.getDirection() == ParameterDirectionKind.RETURN_LITERAL) {
if (firstReturn) {
firstReturn = false;
}
else {
if (StereotypeUtil.isApplicable(operation, DerivedElement.class)) {
return ctx.createFailureStatus ("The operation '" + operation.getName () + "' has more than one return parameter. It must have at most one");
}
else {
break;
}
}
}
}
return ctx.createSuccessStatus();
}
}
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