Examples of org.eclipse.ui.IPerspectiveDescriptor

org.eclipse.ui.IPerspectiveDescriptor
A perspective descriptor describes a perspective in an IPerspectiveRegistry.
A perspective is a template for view visibility, layout, and action visibility within a workbench page. There are two types of perspective: a predefined perspective and a custom perspective.
- A predefined perspective is defined by an extension to the workbench's perspective extension point ("org.eclipse.ui.perspectives"). The extension defines a id, label, and IPerspectiveFactory. A perspective factory is used to define the initial layout for a page.
- A custom perspective is defined by the user. In this case a predefined perspective is modified to suit a particular task and saved as a new perspective. The attributes for the perspective are stored in a separate file in the workbench's metadata directory.
Within a page the user can open any of the perspectives known to the workbench's perspective registry, typically by selecting one from the workbench's Open Perspective menu. When selected, the views and actions within the active page rearrange to reflect the perspective.

This interface is not intended to be implemented by clients.
@see IPerspectiveRegistry


        ArrayList getCheckedItemIds() {
            ArrayList ids = new ArrayList();
            if (getMenuId() == ID_PERSP) {
                for (int i = 0; i < checkedItems.size(); i++) {
                    IPerspectiveDescriptor item = (IPerspectiveDescriptor) checkedItems
                            .get(i);
                    ids.add(item.getId());
                }
            } else if (getMenuId() == ID_VIEW) {
                for (int i = 0; i < checkedItems.size(); i++) {
                    IViewDescriptor item = (IViewDescriptor) checkedItems
                            .get(i);
                    ids.add(item.getId());
                }
            } else if (getMenuId() == ID_WIZARD) {
                for (int i = 0; i < checkedItems.size(); i++) {
                    WorkbenchWizardElement item = (WorkbenchWizardElement) checkedItems
                            .get(i);
                    ids.add(item.getId());
                }
            }
            for (int i = 0; i < children.size(); i++) {
                ShortcutMenu menu = (ShortcutMenu) children.get(i);
                ids.addAll(menu.getCheckedItemIds());

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        XMLMemento memento = XMLMemento.createReadRoot(reader);
        PerspectiveDescriptor newPersp = new PerspectiveDescriptor(
            null, null, null);
        newPersp.restoreState(memento);
        String id = newPersp.getId();
        IPerspectiveDescriptor oldPersp = findPerspectiveWithId(id);
        if (oldPersp == null) {
          add(newPersp);
        }
        reader.close();
      } catch (IOException e) {
        unableToLoadPerspective(null);
      } catch (WorkbenchException e) {
        unableToLoadPerspective(e.getStatus());
      }
    }


    // Get the entries from files, if any
    // if -data @noDefault specified the state location may not be
    // initialized
    IPath path = WorkbenchPlugin.getDefault().getDataLocation();
    if (path == null) {
      return;
    }


    File folder = path.toFile();


    if (folder.isDirectory()) {
      File[] fileList = folder.listFiles();
      int nSize = fileList.length;
      for (int nX = 0; nX < nSize; nX++) {
        File file = fileList[nX];
        if (file.getName().endsWith(EXT)) {
          // get the memento
          InputStream stream = null;
          try {
            stream = new FileInputStream(file);
            reader = new BufferedReader(new InputStreamReader(
                stream, "utf-8")); //$NON-NLS-1$


            // Restore the layout state.
            XMLMemento memento = XMLMemento.createReadRoot(reader);
            PerspectiveDescriptor newPersp = new PerspectiveDescriptor(
                null, null, null);
            newPersp.restoreState(memento);
            IPerspectiveDescriptor oldPersp = findPerspectiveWithId(newPersp
                .getId());
            if (oldPersp == null) {
              add(newPersp);
            }

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  /**
   * @see IPerspectiveRegistry#setDefaultPerspective(String)
   */
  public void setDefaultPerspective(String id) {
    IPerspectiveDescriptor desc = findPerspectiveWithId(id);
    if (desc != null) {
      defaultPerspID = id;
      PrefUtil.getAPIPreferenceStore().setValue(
          IWorkbenchPreferenceConstants.DEFAULT_PERSPECTIVE_ID, id);
    }

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   * Verifies the id of the default perspective. If the default perspective is
   * invalid use the workbench default.
   */
  private void verifyDefaultPerspective() {
    // Step 1: Try current defPerspId value.
    IPerspectiveDescriptor desc = null;
    if (defaultPerspID != null) {
      desc = findPerspectiveWithId(defaultPerspID);
    }
    if (desc != null) {
      return;

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    if (label == null || !(label.trim().length() > 0)) {
      throw new IllegalArgumentException();
    }


    // Check for duplicates
    IPerspectiveDescriptor desc = findPerspectiveWithId(id);
    if (desc != null) {
      throw new IllegalArgumentException();
    }


    // Create descriptor.

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  public IPerspectiveFactory createFactory() throws CoreException {
    // if there is an originalId, then use that descriptor instead
    if (originalId != null) {
      // Get the original descriptor to create the factory. If the
      // original is gone then nothing can be done.
      IPerspectiveDescriptor target = ((PerspectiveRegistry) WorkbenchPlugin
          .getDefault().getPerspectiveRegistry())
          .findPerspectiveWithId(originalId);


      return target == null ? null : ((PerspectiveDescriptor) target)
          .createFactory();

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      label = childMem.getString(IWorkbenchConstants.TAG_LABEL);
      className = childMem.getString(IWorkbenchConstants.TAG_CLASS);
      singleton = (childMem.getInteger(IWorkbenchConstants.TAG_SINGLETON) != null);


      // Find a descriptor in the registry.
      IPerspectiveDescriptor descriptor = WorkbenchPlugin.getDefault()
          .getPerspectiveRegistry().findPerspectiveWithId(
              getOriginalId());


      if (descriptor != null) {
        // Copy the state from the registred descriptor.
        image = descriptor.getImageDescriptor();
      }
    }
    return new Status(IStatus.OK, PlatformUI.PLUGIN_ID, 0, "", null); //$NON-NLS-1$
  }

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     * Determines the active perspective in the window 
     * and calls <code>update(IPerspectiveDescriptor)</code>.
     */
    private void update() {
        if (window != null) {
            IPerspectiveDescriptor persp = null;
            IWorkbenchPage page = window.getActivePage();
            if (page != null) {
                persp = page.getPerspective();
            }
            update(persp);

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      }
    }
    if (perspId == null) {
      return;
    }
    IPerspectiveDescriptor desc = getPerspectiveRegistry()
        .findPerspectiveWithId(perspId);
    if (desc == null) {
      return;
    }

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    // ignored.
    WorkbenchWindow win = (WorkbenchWindow) window;
    if (win != null) {
      WorkbenchPage page = win.getActiveWorkbenchPage();
      if (page != null) {
        IPerspectiveDescriptor perspectives[] = page
            .getOpenPerspectives();
        for (int i = 0; i < perspectives.length; i++) {
          IPerspectiveDescriptor persp = perspectives[i];
          if (perspectiveId.equals(persp.getId())) {
            win.makeVisible();
            page.setPerspective(persp);
            return page;
          }
        }
      }
    }


    // If another window that has the workspace root as input and the
    // requested
    // perpective open and active, then the window is given focus.
    IAdaptable input = getDefaultPageInput();
    IWorkbenchWindow[] windows = getWorkbenchWindows();
    for (int i = 0; i < windows.length; i++) {
      win = (WorkbenchWindow) windows[i];
      if (window != win) {
        WorkbenchPage page = win.getActiveWorkbenchPage();
        if (page != null) {
          boolean inputSame = false;
          if (input == null) {
            inputSame = (page.getInput() == null);
          } else {
            inputSame = input.equals(page.getInput());
          }
          if (inputSame) {
            Perspective persp = page.getActivePerspective();
            if (persp != null) {
              IPerspectiveDescriptor desc = persp.getDesc();
              if (desc != null) {
                if (perspectiveId.equals(desc.getId())) {
                  Shell shell = win.getShell();
                  shell.open();
                  if (shell.getMinimized()) {
                    shell.setMinimized(false);
                  }
                  return page;
                }
              }
            }
          }
        }
      }
    }


    // Otherwise the requested perspective is opened and shown in the
    // specified
    // window or in a new window depending on the current user preference
    // for opening
    // perspectives, and that window is given focus.
    win = (WorkbenchWindow) window;
    if (win != null) {
      IPreferenceStore store = WorkbenchPlugin.getDefault()
          .getPreferenceStore();
      int mode = store.getInt(IPreferenceConstants.OPEN_PERSP_MODE);
      IWorkbenchPage page = win.getActiveWorkbenchPage();
      IPerspectiveDescriptor persp = null;
      if (page != null) {
        persp = page.getPerspective();
      }


      // Only open a new window if user preference is set and the window
      // has an active perspective.
      if (IPreferenceConstants.OPM_NEW_WINDOW == mode && persp != null) {
        IWorkbenchWindow newWindow = openWorkbenchWindow(perspectiveId,
            input);
        return newWindow.getActivePage();
      }


      IPerspectiveDescriptor desc = getPerspectiveRegistry()
          .findPerspectiveWithId(perspectiveId);
      if (desc == null) {
        throw new WorkbenchException(
            NLS
                .bind(

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