HelloHandler.java

/*
 * Copyright (c) 2016, Alex Blewitt, Bandlem Ltd
 * Copyright (c) 2016, Packt Publishing Ltd
 *
 * 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
 */
package com.packtpub.e4.clock.ui.handlers;

import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.ParameterizedCommand;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.core.services.statusreporter.StatusReporter;
import org.eclipse.e4.ui.di.UISynchronize;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.commands.ICommandService;
import org.eclipse.ui.progress.IProgressConstants2;

import com.packtpub.e4.clock.ui.Activator;

@SuppressWarnings("restriction")
public class HelloHandler {
	@Execute
	public void execute(final UISynchronize display, final ICommandService commandService,
			final StatusReporter statusReporter) {
		Job job = new Job("About to say hello") {
			protected IStatus run(IProgressMonitor monitor) {
				try {
					SubMonitor subMonitor = SubMonitor.convert(monitor, "Preparing", 5000);
					// subMonitor = null; // cause a NullPointerException
					for (int i = 0; i < 50 && !subMonitor.isCanceled(); i++) {
						if (i == 10) {
							subMonitor.subTask("Doing something");
						} else if (i == 12) {
							checkDozen(subMonitor.newChild(100));
							continue;
						} else if (i == 25) {
							subMonitor.subTask("Doing something else");
						} else if (i == 40) {
							subMonitor.subTask("Nearly there");
						}
						Thread.sleep(100);
						subMonitor.worked(100);
					}
				} catch (InterruptedException e) {
				} catch (RuntimeException e) {
					// return new Status(IStatus.ERROR, Activator.PLUGIN_ID, "Programming bug?", e);
					Status status = new Status(IStatus.ERROR, Activator.PLUGIN_ID, "Programming bug?", e);
					statusReporter.report(status, StatusReporter.LOG | StatusReporter.SHOW);
				} finally {
					monitor.done();
				}
				if (!monitor.isCanceled()) {
					display.asyncExec(() -> {
						MessageDialog.openInformation(null, "Hello", "World");
						// MessageDialog.openError(null, "Hello", "World");
					});
				}
				return Status.OK_STATUS;
			}

			private void checkDozen(IProgressMonitor monitor) {
				try {
					if (monitor == null)
						monitor = new NullProgressMonitor();
					monitor.beginTask("Checking a dozen", 12);
					for (int i = 0; i < 12; i++) {
						Thread.sleep(10);
						monitor.worked(1);
					}
				} catch (InterruptedException e) {
				} finally {
					monitor.done();
				}
			}
		};
		Command command = commandService.getCommand("com.packtpub.e4.clock.ui.command.hello");
		if (command != null) {
			job.setProperty(IProgressConstants2.COMMAND_PROPERTY, ParameterizedCommand.generateCommand(command, null));
			job.setProperty(IProgressConstants2.ICON_PROPERTY,
					ImageDescriptor.createFromURL(HelloHandler.class.getResource("/icons/sample.gif")));
		}
		job.schedule();
		return;
	}
}