org.eclipse.fmc.blockdiagram.editor/src/org/eclipse/fmc/blockdiagram/editor/wizards/BlockDiagramFileWizard.java

/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2013, 2013 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.fmc.blockdiagram.editor.wizards;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.common.util.URI;
import org.eclipse.fmc.blockdiagram.editor.util.DiagramFactory;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWizard;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;

/**
 * This class is responsible for creating Blockdiagram files with a single graphical
 * file.
 * 
 * @author Benjamin Schmeling
 * @author Rainer Thome
 * 
 */
public class BlockDiagramFileWizard extends Wizard implements INewWizard {

	protected BlockDiagramFilePage page;
	protected int diagramWidth;
	protected int diagramHeight;
	protected int gridUnit;
	protected ISelection selection;

	/**
	 * Constructor for BlockDiagramFileWizard.
	 */
	public BlockDiagramFileWizard() {
		super();
		setNeedsProgressMonitor(true);
	}

	/**
	 * Adding the page to the wizard.
	 */
	public void addPages() {
		page = new BlockDiagramFilePage(selection);
		addPage(page);
	}

	/**
	 * This method is called when 'Finish' button is pressed in the wizard. We
	 * will create an operation and run it using wizard as execution context.
	 */
	public boolean performFinish() {
		final String containerName = page.getContainerName();
		final String fileName = page.getFileName();
		this.gridUnit = page.getGridUnit();
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor)
					throws InvocationTargetException {
				try {
					doFinish(containerName, fileName, monitor,
							page.getExtension());
				} catch (CoreException e) {
					throw new InvocationTargetException(e);
				} finally {
					monitor.done();
				}
			}
		};
		try {
			getContainer().run(true, false, op);
		} catch (InterruptedException e) {
			return false;
		} catch (InvocationTargetException e) {
			Throwable realException = e.getTargetException();
			MessageDialog.openError(getShell(), "Error",
					realException.getMessage());
			return false;
		}
		return true;
	}

	/**
	 * The worker method. It will find the container, create the file if missing
	 * or just replace its contents, and open the editor on the newly created
	 * file.
	 */
	private void doFinish(String containerName, String fileName,
			IProgressMonitor monitor, String extension) throws CoreException {
		// create a sample file
		monitor.beginTask("Creating " + fileName, 2);
		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		IResource resource = root.findMember(new Path(containerName));
		if (!resource.exists() || !(resource instanceof IContainer)) {
			throwCoreException("Project \"" + containerName
					+ "\" does not exist.");
		}
		IContainer container = (IContainer) resource;
		final IFile file = container.getFile(new Path(fileName));
		try {
			InputStream stream = openContentStream();
			if (!file.exists()) {

				file.create(stream, true, monitor);
			}
			stream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		createBlockdiagramFile(file);
		monitor.worked(1);
		monitor.setTaskName("Opening file for editing...");
		getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				IWorkbenchPage page = PlatformUI.getWorkbench()
						.getActiveWorkbenchWindow().getActivePage();
				try {
					IDE.openEditor(page, file, true);
				} catch (PartInitException e) {
					e.printStackTrace();
				}
			}
		});
		monitor.worked(1);
	}

	protected void createBlockdiagramFile(final IFile file) {
		DiagramFactory.createDefaultBlockdiagramFile(URI.createPlatformResourceURI(file
				.getFullPath().toString(), true), diagramWidth, diagramHeight,
				gridUnit);
	}

	/**
	 * We will initialize file contents with a sample text.
	 */
	private InputStream openContentStream() {
		return new ByteArrayInputStream(new byte[0]);
	}

	private void throwCoreException(String message) throws CoreException {
		IStatus status = new Status(IStatus.ERROR, "BlockdiagramEditor", IStatus.OK,
				message, null);
		throw new CoreException(status);
	}

	/**
	 * We will accept the selection in the workbench to see if we can initialize
	 * from it.
	 * 
	 * @see IWorkbenchWizard#init(IWorkbench, IStructuredSelection)
	 */
	public void init(IWorkbench workbench, IStructuredSelection selection) {
		this.selection = selection;
	}
}