/*******************************************************************************
 * Copyright (c) 2016 ALL4TEC & 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:
 *     ALL4TEC & CEA LIST - initial API and implementation
 ******************************************************************************/
package org.polarsys.esf.safetyreq.execution.ui.tester;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EObjectTreeElement;
import org.eclipse.papyrus.sysml14.requirements.Requirement;
import org.eclipse.uml2.uml.Class;
import org.eclipse.uml2.uml.util.UMLUtil;

/**
 * Class dedicated to verify if the selected element is a SysML Requirement.
 *
 * @author $Author: ymunoz $
 * @version $Revision: 168 $
 */
public class SysMLRequirementTester
    extends PropertyTester {

    /** Property "isSysMLRequirement". */
    private static final String IS_SYSML_REQUIREMENT = "isSysMLRequirement"; //$NON-NLS-1$

    /**
     * Default constructor.
     */
    public SysMLRequirementTester() {
        // TODO Auto-generated constructor stub
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean test(
        final Object pReceiver,
        final String pProperty,
        final Object[] pArgs,
        final Object pExpectedValue) {
        boolean vAnswer = false;

        if (IS_SYSML_REQUIREMENT.equals(pProperty) && pReceiver instanceof IStructuredSelection) {
            IStructuredSelection vSelection = (IStructuredSelection) pReceiver;
            final Object vFirstElement = vSelection.getFirstElement();

            // If selected element in a EditPart
            if (vFirstElement instanceof EditPart) {
                EditPart vEditPart = (EditPart) vFirstElement;
                if (vEditPart.getModel() instanceof View) {
                    View vView = (View) vEditPart.getModel();
                    Class vClass = null;
                    if (vView.getElement() instanceof Class) {
                        vClass = (Class) vView.getElement();
                    }
                    if ((vClass != null) && (UMLUtil.getStereotypeApplication(vClass, Requirement.class) != null)) {
                        vAnswer = true;
                    }
                }
            } else if (vFirstElement instanceof EObjectTreeElement) {
                // If selected element in the Model Explorer
                EObjectTreeElement vTreeEl = (EObjectTreeElement) vFirstElement;
                if (vTreeEl.getEObject() instanceof Class) {
                    Class vClass = (Class) vTreeEl.getEObject();
                    if (UMLUtil.getStereotypeApplication(vClass, Requirement.class) != null) {
                        vAnswer = true;
                    }
                }
            }
        }
        return new Boolean(vAnswer).equals(pExpectedValue);
    }

}