Java tutorial
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileOutputStream; import org.eclipse.jface.viewers.CheckboxTableViewer; import org.eclipse.jface.viewers.ILabelProvider; import org.eclipse.jface.viewers.ILabelProviderListener; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.DirectoryDialog; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; /** * This class demonstrates CheckboxTableViewer. It allows you to check files to * copy, and copy them to a backup directory. */ public class BackupFiles extends ApplicationWindow { // Used to show status private Label status; /** * BackupFiles constructor */ public BackupFiles() { super(null); } /** * Runs the application */ public void run() { // Don't return from open() until window closes setBlockOnOpen(true); // Open the main window open(); // Dispose the display Display.getCurrent().dispose(); } /** * Configures the shell * * @param shell * the shell */ protected void configureShell(Shell shell) { super.configureShell(shell); // Set the title bar text and the size shell.setText("Backup Files"); shell.setSize(400, 400); } /** * Creates the main window's contents * * @param parent * the main window * @return Control */ protected Control createContents(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(new GridLayout(1, false)); // Create the source directory panel and its controls final Text sourceDir = createFilePanelHelper(composite, "Source Dir:"); // Create the CheckboxTableViewer to display the files in the source dir final CheckboxTableViewer ctv = CheckboxTableViewer.newCheckList(composite, SWT.BORDER); ctv.getTable().setLayoutData(new GridData(GridData.FILL_BOTH)); ctv.setContentProvider(new BackupFilesContentProvider()); ctv.setLabelProvider(new BackupFilesLabelProvider()); // Create the destination directory panel and its controls final Text destDir = createFilePanelHelper(composite, "Dest Dir:"); // Create the Copy button Button copy = new Button(composite, SWT.PUSH); copy.setText("Copy"); // Create the status field status = new Label(composite, SWT.NONE); status.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); // When the source directory changes, change the input for the viewer sourceDir.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent event) { ctv.setInput(((Text) event.widget).getText()); } }); // When copy is pressed, copy the files copy.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { // Get the checked elements Object[] files = ctv.getCheckedElements(); if (files.length > 0) { // Some files are checked; make sure we have a valid // destination File dest = new File(destDir.getText()); if (dest.isDirectory()) { // Go through each file for (int i = 0, n = files.length; i < n; i++) { copyFile((File) files[i], dest); } } else showMessage("You must select a valid destination directory"); } else showMessage("You must select some files to copy"); } }); return composite; } /** * Helper method to create the label/text/button for a directory * * @param composite * the parent composite * @param label * the text for the label * @return Text */ private Text createFilePanelHelper(Composite composite, String label) { // Create the composite to hold the controls Composite panel = new Composite(composite, SWT.BORDER); panel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); panel.setLayout(new GridLayout(3, false)); // Create the controls new Label(panel, SWT.LEFT).setText(label); Text text = new Text(panel, SWT.BORDER); text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Button browse = new Button(panel, SWT.PUSH); // Add browsing browse.setText("..."); browse.addSelectionListener(new DirectoryBrowser(text)); // Return the Text that holds the directory return text; } /** * Copies a file * * @param file * the file to copy * @param targetDir * the directory to copy to */ private void copyFile(File file, File targetDir) { BufferedInputStream in = null; BufferedOutputStream out = null; File destFile = new File(targetDir.getAbsolutePath() + File.separator + file.getName()); try { showMessage("Copying " + file.getName()); in = new BufferedInputStream(new FileInputStream(file)); out = new BufferedOutputStream(new FileOutputStream(destFile)); int n; while ((n = in.read()) != -1) { out.write(n); } showMessage("Copied " + file.getName()); } catch (Exception e) { showMessage("Cannot copy file " + file.getAbsolutePath()); } finally { if (in != null) try { in.close(); } catch (Exception e) { } if (out != null) try { out.close(); } catch (Exception e) { } } } /** * Shows a message * * @param message * the message */ private void showMessage(String message) { status.setText(message); } /** * The application entry point * * @param args * the command line arguments */ public static void main(String[] args) { new BackupFiles().run(); } } /** * This class returns the files in the specified directory. If the specified * directory doesn't exist, it returns an empty array. */ class BackupFilesContentProvider implements IStructuredContentProvider { private static final Object[] EMPTY = new Object[] {}; /** * Gets the files in the specified directory * * @param arg0 * a String containing the directory */ public Object[] getElements(Object arg0) { File file = new File((String) arg0); if (file.isDirectory()) { return file.listFiles(new FileFilter() { public boolean accept(File pathName) { // Ignore directories; return only files return pathName.isFile(); } }); } return EMPTY; } /** * Disposes any created resources */ public void dispose() { // Nothing to dispose } /** * Called when the input changes */ public void inputChanged(Viewer arg0, Object arg1, Object arg2) { // Nothing to do } } /** * This class provides the labels for files */ class BackupFilesLabelProvider implements ILabelProvider { /** * Returns the image * * @param arg0 * the file * @return Image */ public Image getImage(Object arg0) { return null; } /** * Returns the name of the file * * @param arg0 * the name of the file * @return String */ public String getText(Object arg0) { return ((File) arg0).getName(); } /** * Adds a listener * * @param arg0 * the listener */ public void addListener(ILabelProviderListener arg0) { // Throw it away } /** * Disposes any created resources */ public void dispose() { // Nothing to dispose } /** * Returns whether changing this property for this element affects the label * * @param arg0 * the element * @param arg1 * the property */ public boolean isLabelProperty(Object arg0, String arg1) { return false; } /** * Removes a listener * * @param arg0 * the listener */ public void removeListener(ILabelProviderListener arg0) { // Ignore } } /** * This class allows users to browse for a directory */ class DirectoryBrowser extends SelectionAdapter { // The Text this browser is tied to private Text text; /** * DirectoryBrowser constructor * * @param text */ public DirectoryBrowser(Text text) { this.text = text; } /** * Called when the browse button is pushed * * @param event * the generated event */ public void widgetSelected(SelectionEvent event) { DirectoryDialog dlg = new DirectoryDialog(Display.getCurrent().getActiveShell()); dlg.setFilterPath(text.getText()); String dir = dlg.open(); if (dir != null) { text.setText(dir); } } }