org.eclipse.gmf.runtime.emf.core/src/org/eclipse/gmf/runtime/emf/core/internal/validation/ActionNotAbandonedConstraint.java

/******************************************************************************
 * Copyright (c) 2005 IBM Corporation and others.
 * 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:
 *    IBM Corporation - initial API and implementation 
 ****************************************************************************/


package org.eclipse.gmf.runtime.emf.core.internal.validation;

import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.emf.validation.AbstractModelConstraint;
import org.eclipse.emf.validation.IValidationContext;

/**
 * A constraint that ensures that a write action was not abandoned by some
 * listener adding an abandon-action command to the write action.
 *
 * @author Christian W. Damus (cdamus)
 */
public class ActionNotAbandonedConstraint
	extends AbstractModelConstraint {
	
	/**
	 * Initializes me.
	 */
	public ActionNotAbandonedConstraint() {
		super();
	}
	
	public IStatus validate(IValidationContext ctx) {
    	if (ctx.getCurrentConstraintData() == null) {
    		// put myself as a token to prevent calling me again
    		ctx.putCurrentConstraintData(this);
    		
    		List events = ctx.getAllEvents();
    		
    		for (Iterator iter = events.iterator(); iter.hasNext();) {
    			Object next = iter.next();
    			
    			if (next instanceof ActionAbandonedNotification) {
    				return ctx.createFailureStatus(new Object[] {
    					((ActionAbandonedNotification) next).getStatus().getMessage()
    				});
    			}
    		}
    	}
    	
    	return ctx.createSuccessStatus();
	}
}