de.tub.tfs.henshin.editor.actions.HenshinDeleteAction.java Source code

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Here is the source code for de.tub.tfs.henshin.editor.actions.HenshinDeleteAction.java

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/*******************************************************************************
 * Copyright (c) 2010-2015 Henshin developers. 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:
 *     TU Berlin, University of Luxembourg, SES S.A.
 *******************************************************************************/
/**
 * 
 */
package de.tub.tfs.henshin.editor.actions;

import java.util.List;

import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.henshin.model.Module;
import org.eclipse.emf.henshin.model.Node;
import org.eclipse.emf.henshin.model.Rule;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gef.ui.actions.DeleteAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.ui.IWorkbenchPart;

import de.tub.tfs.henshin.editor.util.ModelUtil;

/**
 * The Class HenshinDeleteAction.
 * 
 * @author nam
 */
public class HenshinDeleteAction extends DeleteAction {

    /**
     * Instantiates a new henshin delete action.
     * 
     * @param part
     *            the part
     */
    public HenshinDeleteAction(IWorkbenchPart part) {
        super(part);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.eclipse.gef.ui.actions.DeleteAction#createDeleteCommand(java.util
     * .List)
     */
    @SuppressWarnings("rawtypes")
    @Override
    public Command createDeleteCommand(List objects) {
        CompoundCommand cmd = (CompoundCommand) super.createDeleteCommand(objects);

        if (cmd != null) {
            if (cmd.getCommands().size() == 1) {
                cmd.setLabel(((Command) cmd.getCommands().get(0)).getLabel());
            } else {
                cmd.setLabel("Delete Objects");
            }
        }

        return cmd;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.gef.ui.actions.DeleteAction#run()
     */
    @Override
    public void run() {
        if (!getSelectedObjects().isEmpty()) {
            final Object targetObject = getSelectedObjects().get(0);
            if (targetObject instanceof EditPart) {
                final Object model = ((EditPart) targetObject).getModel();
                if (model instanceof EPackage) {
                    if (!canDeleteEPackage(targetObject, (EPackage) model)) {
                        return;
                    }
                } else if (model instanceof Rule) {
                    // TODO:
                    //if (model.getMulti)
                    // && canDeleteRule(targetObject, (Rule) model)) {
                    // return;
                    // }
                }
            }
        }

        super.run();
    }

    private boolean canDeleteEPackage(Object targetObject, EPackage ePackage) {
        Module rootModel = (Module) ((EditPart) targetObject).getParent().getParent().getModel();
        String errMsg = ModelUtil.getEPackageReferences(ePackage, rootModel);

        if (errMsg != null) {
            MessageDialog.open(MessageDialog.INFORMATION, null, "Delete Failed", "EPackage [" + ePackage.getName()
                    + "] is used in:\n\n" + errMsg + "\n\nPlease delete all references first.", SWT.NONE);
            return false;
        }

        return true;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.gef.ui.actions.DeleteAction#calculateEnabled()
     */
    @Override
    protected boolean calculateEnabled() {
        if (!getSelectedObjects().isEmpty()) {
            Object targetObject = getSelectedObjects().get(0);
            if (targetObject instanceof EditPart) {
                Object model = ((EditPart) targetObject).getModel();

                if (model instanceof EPackage) {
                    return true;
                }

                if (model instanceof Node) {
                    Node node = (Node) model;

                }
            }
        }
        return super.calculateEnabled();
    }
}