Java tutorial
/** * Copyright (C) 2012, Bayerische Motoren Werke Aktiengesellschaft (BMW AG) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 * Unless required by applicable law or agreed to in writing, software distributed * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR * CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. **/ package com.bmw.spdxeditor.wizards; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.InvocationTargetException; import java.net.URL; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import org.apache.commons.lang3.StringUtils; 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.core.runtime.preferences.InstanceScope; 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; import org.osgi.service.prefs.Preferences; import com.bmw.spdxeditor.Activator; /** * An Eclipse wizard for creating new SPDX files. * @author Johannes Klein (johannes.klein@bmw.de) * */ public class NewSPDXFileWizard extends Wizard implements INewWizard { private NewSPDXFileWizardPage page; private ISelection selection; /** * Constructor for SampleNewWizard. */ public NewSPDXFileWizard() { super(); setNeedsProgressMonitor(true); } /** * Adding the page to the wizard. */ public void addPages() { page = new NewSPDXFileWizardPage(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(); IRunnableWithProgress op = new IRunnableWithProgress() { public void run(IProgressMonitor monitor) throws InvocationTargetException { try { doFinish(containerName, fileName, monitor); } 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) 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("Container \"" + containerName + "\" does not exist."); } IContainer container = (IContainer) resource; final IFile file = container.getFile(new Path(fileName)); try { InputStream stream = openContentStream(this.page.getSpdxFileURL()); if (file.exists()) { // Overwrite throwCoreException("File does already exist."); //file.setContents(stream, true, true, monitor); } else { file.create(stream, true, monitor); } stream.close(); } catch (IOException e) { } // Start monitor thread monitor.worked(1); // a non-negative number of work units just completed 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) { } } }); monitor.worked(1); // a non-negative number of work units just completed } private InputStream openContentStream(URL spdxUrl) throws CoreException { DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); Preferences prefs = new InstanceScope().getNode(Activator.PLUGIN_ID); // you might want to call prefs.sync() if you're worried about others changing your settings String spdxFileCreator = prefs.get("SPDX_DEFAULT_FILE_CREATOR", ""); if (StringUtils.isEmpty(spdxFileCreator)) { this.throwCoreException("Please configure SPDX_DEFAULT_FILE_CREATOR first"); } // Initialize a basic SPDX file from String String contents = "<?xml version=\"1.0\"?>\n<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" " + "xmlns=\"http://spdx.org/rdf/terms#\" xmlns:rdfs=\"http://www.w3.org/2000/01/rdf-schema#\"><SpdxDocument rdf:about=\"" + spdxUrl.toString() + "#SPDXANALYSIS\">" + "<dataLicense rdf:resource=\"http://spdx.org/licenses/PDDL-1.0\" />" + "<specVersion>SPDX-1.0</specVersion>" + "<creationInfo><CreationInfo><creator>" + spdxFileCreator + "</creator><created>" + df.format(new Date()) + "</created></CreationInfo></creationInfo>" + "<describesPackage><Package rdf:about=\"" + spdxUrl.toString() + "#SPDXANALYSIS?package\">" + "<packageVerificationCode><PackageVerificationCode><packageVerificationCodeValue>0000000000000000000000000000000000000000</packageVerificationCodeValue></PackageVerificationCode></packageVerificationCode>" + "<licenseConcluded rdf:resource=\"http://spdx.org/rdf/terms#noassertion\" />" + "<licenseDeclared rdf:resource=\"http://spdx.org/rdf/terms#noassertion\" />" + "<licenseInfoFromFiles rdf:resource=\"http://spdx.org/rdf/terms#noassertion\" />" + "</Package>" + "</describesPackage></SpdxDocument>" + "</rdf:RDF>\n"; return new ByteArrayInputStream(contents.getBytes()); } private void throwCoreException(String message) throws CoreException { IStatus status = new Status(IStatus.ERROR, "SPDXEditor", 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; } }