org.eclipse.emf.ecp.emf2web.wizard.pages.EClassPage.java Source code

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Here is the source code for org.eclipse.emf.ecp.emf2web.wizard.pages.EClassPage.java

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/*******************************************************************************
 * Copyright (c) 2014-2015 EclipseSource Muenchen GmbH 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:
 * Stefan Dirix - initial API and implementation
 *
 *******************************************************************************/
package org.eclipse.emf.ecp.emf2web.wizard.pages;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.CheckStateChangedEvent;
import org.eclipse.jface.viewers.CheckboxTableViewer;
import org.eclipse.jface.viewers.ICheckStateListener;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;

/**
 * Page for selecting an EClass out of an Ecore model.
 *
 */
public class EClassPage extends WizardPage {

    private CheckboxTableViewer eClassTableViewer;
    private Resource ecoreResource;

    private final Set<EClass> selectedEClasses;

    /**
     * @return the ecoreResource or {@code null} if not set.
     */
    public Resource getEcoreResource() {
        return ecoreResource;
    }

    /**
     * Create the wizard.
     */
    public EClassPage() {
        super(Messages.EClassPage_ConstructorTitle);
        setTitle(Messages.EClassPage_Title);
        setDescription(Messages.EClassPage_Description);

        selectedEClasses = new HashSet<EClass>();
    }

    /**
     * Create contents of the wizard.
     *
     * @param parent
     */
    @Override
    public void createControl(Composite parent) {
        final Composite container = new Composite(parent, SWT.NULL);

        setControl(container);
        container.setLayout(new FillLayout(SWT.HORIZONTAL));

        eClassTableViewer = CheckboxTableViewer.newCheckList(container, SWT.BORDER | SWT.FULL_SELECTION);
        eClassTableViewer.addCheckStateListener(new EClassTableViewerICheckStateListener());
        eClassTableViewer.setContentProvider(new ArrayContentProvider());

        final ComposedAdapterFactory composedAdapterFactory = new ComposedAdapterFactory(
                ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
        final AdapterFactoryLabelProvider labelProvider = new AdapterFactoryLabelProvider(composedAdapterFactory);

        eClassTableViewer.setLabelProvider(labelProvider);

        setPageComplete(false);
    }

    /**
     * Indicate the page that the resource and therefore the model changed.
     *
     * @param ecoreResource
     *            The new resource containing an Ecore model.
     */
    public void setNewResource(Resource ecoreResource) {
        if (this.ecoreResource == ecoreResource) {
            // Nothing changed -> Nothing to do
            return;
        }

        this.ecoreResource = ecoreResource;
        setPageComplete(false);

        final List<EClass> eClassList = new ArrayList<EClass>();
        for (final Iterator<EObject> it = ecoreResource.getAllContents(); it.hasNext();) {
            final EObject object = it.next();
            if (!(object instanceof EPackage)) {
                continue;
            }
            final EPackage ePackage = (EPackage) object;
            for (final EClassifier eclassifier : ePackage.getEClassifiers()) {
                if (eclassifier instanceof EClass) {
                    eClassList.add((EClass) eclassifier);
                }
            }
        }

        Collections.sort(eClassList, new Comparator<EClass>() {
            @Override
            public int compare(EClass arg0, EClass arg1) {
                return arg0.getName().compareTo(arg1.getName());
            }
        });

        selectedEClasses.clear();
        eClassTableViewer.setInput(eClassList);
    }

    /**
     * Listener for managing CheckStateEvents in {@link EClassPage}.
     *
     * @author Stefan Dirix
     *
     */
    private class EClassTableViewerICheckStateListener implements ICheckStateListener {
        @Override
        public void checkStateChanged(CheckStateChangedEvent event) {
            if (event.getChecked()) {
                selectedEClasses.add((EClass) event.getElement());
            } else {
                selectedEClasses.remove(event.getElement());
            }

            if (selectedEClasses.size() > 0 && !isPageComplete()) {
                setPageComplete(true);
            }
            if (selectedEClasses.size() == 0 && isPageComplete()) {
                setPageComplete(false);
            }
        }
    }

    /**
     * Returns the EClasses selected by the user.
     *
     * @return
     *         EClasses selected by the user.
     */
    public Set<EClass> getSelectedEClasses() {
        return selectedEClasses;
    }

}