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public class HelloWorldSwtPerspective implements SpoonPerspective {
  private Composite comp;
  private static HelloWorldSwtPerspective instance = new HelloWorldSwtPerspective();

  private HelloWorldSwtPerspective(){
    createUI();
  }

  private void createUI(){
    comp = new Composite(((Spoon) SpoonFactory.getInstance()).getShell(), SWT.BORDER);
    comp.setLayout(new GridLayout());
    comp.setLayoutData(new GridData(GridData.FILL_BOTH));
    Label lbl = new Label(comp, SWT.CENTER);
    lbl.setLayoutData(new GridData(GridData.FILL_BOTH));
    lbl.setText("This perspective has added two menu-items to the Spoon menu-system. One is under " +
        "Tools->\"Spoon Plugin Example\", the other is only visible when the perspective is active: " +
        "Edit->\"Perspective Only Action\"");
  }

  public static HelloWorldSwtPerspective getInstance(){
    return instance;
  }

  public void setActive(boolean b) {
  }

  public List<XulOverlay> getOverlays() {
    return Collections.singletonList((XulOverlay) new DefaultXulOverlay("org/pentaho/di/plugins/examples/helloworld/res/spoon_perspective_overlay.xul"));
  }

  public List<XulEventHandler> getEventHandlers() {
    return Collections.singletonList((XulEventHandler) new HelloWorldPerspectiveHandler());
  }

  public void addPerspectiveListener(SpoonPerspectiveListener spoonPerspectiveListener) {
  }

  public String getId() {
    return "helloWorld";
  }

  // Whatever you pass out will be reparented. Don't construct the UI in this method as it may be called more than once.
  public Composite getUI() {
    return comp;
  }

  public String getDisplayName(Locale locale) {
    return "Spoon Example";
  }

  public InputStream getPerspectiveIcon() {
    ClassLoader loader = getClass().getClassLoader();
    return loader.getResourceAsStream("org/pentaho/di/plugins/examples/helloworld/res/blueprint.png");
  }

  /**
   * This perspective is not Document based, therefore there is no EngineMeta to save/open.
   */
  public EngineMetaInterface getActiveMeta() {
    return null;
  }
}