bundles/core/org.eclipse.apogy.core.invocator.ui/src/org/eclipse/apogy/core/invocator/ui/wizards/VariableImplementationsWizardPage.java

/*******************************************************************************
 * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency 
 * 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:
 *     Pierre Allard,
 *     Regent L'Archeveque,
 *     Olivier L. Larouche - initial API and implementation
 *
 * SPDX-License-Identifier: EPL-1.0
 *     
 *******************************************************************************/
package org.eclipse.apogy.core.invocator.ui.wizards;

import org.eclipse.apogy.core.invocator.Context;
import org.eclipse.apogy.core.invocator.VariableImplementationsList;
import org.eclipse.apogy.core.invocator.ui.composites.VariableImplementationsComposite;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.ecore.util.Diagnostician;
import org.eclipse.jface.dialogs.IDialogPage;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;

public class VariableImplementationsWizardPage extends WizardPage {

	private final static String WIZARD_PAGE_ID = "org.eclipse.apogy.core.invocator.ui.wizards.VariableImplementationsWizardPage";
	private VariableImplementationsComposite variableImplementationsComposite;
	private Adapter adapter;
	private Context context;

	/**
	 * Constructor for the WizardPage.
	 * 
	 * @param pageName
	 * @wbp.parser.constructor
	 */
	public VariableImplementationsWizardPage() {
		super(WIZARD_PAGE_ID);
		setTitle("Variable implementation");
		setDescription("Select a variable implementation");
	}

	public VariableImplementationsWizardPage(Context context) {
		this();

		if (this.context != null) {
			this.context.eAdapters().remove(getAdapter());
		}
		this.context = context;

		context.getVariableImplementationsList().getVariableImplementations().get(0).eAdapters().add(getAdapter());
	}

	private Adapter getAdapter() {
		if (this.adapter == null) {
			this.adapter = new AdapterImpl() {
				@Override
				public void notifyChanged(Notification msg) {
					validate();
				}
			};
		}
		return this.adapter;
	}

	/**
	 * @see IDialogPage#createControl(Composite)
	 */
	@Override
	public void createControl(Composite parent) {
		this.variableImplementationsComposite = new VariableImplementationsComposite(parent, SWT.None);
		this.variableImplementationsComposite.setContext(this.context);
		this.variableImplementationsComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));

		setControl(this.variableImplementationsComposite);
		this.variableImplementationsComposite.addDisposeListener(new DisposeListener() {

			@Override
			public void widgetDisposed(DisposeEvent e) {
				dispose();
			}
		});

		validate();
	}

	@Override
	public void dispose() {
		super.dispose();
		if (this.context != null) {
			this.context.eAdapters().remove(getAdapter());
		}
	}

	/**
	 * This method is invoked to validate the content.
	 */
	protected void validate() {
		String errorVariableStr = null;

		VariableImplementationsList variableImplementationsList = this.context.getVariableImplementationsList();

		Diagnostic diagnostic = Diagnostician.INSTANCE.validate(variableImplementationsList);

		if (diagnostic.getSeverity() != Diagnostic.OK) {
			errorVariableStr = "A variable implementation must be selected";
		}

		setErrorMessage(errorVariableStr);
		setPageComplete(errorVariableStr == null);
	}
}