Java by API/org.eclipse.jface.viewers/ITreeContentProvider

implements ITreeContentProvider

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
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.ruposite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class MainClass extends ApplicationWindow {
  public MainClass() {
    super(null);
    setBlockOnOpen(true);
    open();
    Display.getCurrent().dispose();
  }
  protected void configureShell(Shell shell) {
    super.configureShell(shell);
    shell.setText("File Tree");
    shell.setSize(400, 400);
  }
  protected Control createContents(Composite parent) {
    Composite composite = new Composite(parent, SWT.NONE);
    composite.setLayout(new GridLayout(1, false));
    Button preserveCase = new Button(composite, SWT.CHECK);
    preserveCase.setText("&Preserve case");
    final TreeViewer tv = new TreeViewer(composite);
    tv.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
    tv.setContentProvider(new FileTreeContentProvider());
    tv.setLabelProvider(new FileTreeLabelProvider());
    tv.setInput("root");
    preserveCase.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        boolean preserveCase = ((Button) event.widget).getSelection();
        FileTreeLabelProvider ftlp = (FileTreeLabelProvider) tv.getLabelProvider();
        ftlp.setPreserveCase(preserveCase);
      }
    });
    return composite;
  }
  public static void main(String[] args) {
    new MainClass();
  }
}
class FileTreeLabelProvider implements ILabelProvider {
  private List listeners = new ArrayList();
  private Image file;
  private Image dir;
  boolean preserveCase;
  public FileTreeLabelProvider() {
    try {
      file = new Image(null, new FileInputStream("file.gif"));
      dir = new Image(null, new FileInputStream("directory.gif"));
    } catch (FileNotFoundException e) {
    }
  }
  public void setPreserveCase(boolean preserveCase) {
    this.preserveCase = preserveCase;
    LabelProviderChangedEvent event = new LabelProviderChangedEvent(this);
    for (int i = 0, n = listeners.size(); i < n; i++) {
      ILabelProviderListener ilpl = (ILabelProviderListener) listeners.get(i);
      ilpl.labelProviderChanged(event);
    }
  }
  public Image getImage(Object arg0) {
    return ((File) arg0).isDirectory() ? dir : file;
  }
  public String getText(Object arg0) {
    String text = ((File) arg0).getName();
    if (text.length() == 0) {
      text = ((File) arg0).getPath();
    }
    return preserveCase ? text : text.toUpperCase();
  }
  public void addListener(ILabelProviderListener arg0) {
    listeners.add(arg0);
  }
  public void dispose() {
    if (dir != null)
      dir.dispose();
    if (file != null)
      file.dispose();
  }
  public boolean isLabelProperty(Object arg0, String arg1) {
    return false;
  }
  public void removeListener(ILabelProviderListener arg0) {
    listeners.remove(arg0);
  }
}
class FileTreeContentProvider implements ITreeContentProvider {
  public Object[] getChildren(Object arg0) {
    return ((File) arg0).listFiles();
  }
  public Object getParent(Object arg0) {
    return ((File) arg0).getParentFile();
  }
  public boolean hasChildren(Object arg0) {
    Object[] obj = getChildren(arg0);
    return obj == null ? false : obj.length > 0;
  }
  public Object[] getElements(Object arg0) {
    return File.listRoots();
  }
  public void dispose() {
  }
  public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
  }
}