plugins/org.eclipse.net4j.util.ui/src/org/eclipse/net4j/util/internal/ui/views/Net4jIntrospectorView.java - cdo/cdo - Git at Google

 /*
  * Copyright (c) 2007-2013 Eike Stepper (Berlin, Germany) and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *    Eike Stepper - initial API and implementation
  */
 package org.eclipse.net4j.util.internal.ui.views;

 import org.eclipse.net4j.ui.shared.SharedIcons;
 import org.eclipse.net4j.util.ReflectUtil;
 import org.eclipse.net4j.util.WrappedException;
 import org.eclipse.net4j.util.collection.Pair;
 import org.eclipse.net4j.util.container.IPluginContainer;
 import org.eclipse.net4j.util.event.EventUtil;
 import org.eclipse.net4j.util.event.IEvent;
 import org.eclipse.net4j.util.event.IListener;
 import org.eclipse.net4j.util.internal.ui.bundle.OM;
 import org.eclipse.net4j.util.internal.ui.messages.Messages;
 import org.eclipse.net4j.util.ui.UIUtil;

 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.action.IToolBarManager;
 import org.eclipse.jface.action.Separator;
 import org.eclipse.jface.viewers.DoubleClickEvent;
 import org.eclipse.jface.viewers.IDoubleClickListener;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITableLabelProvider;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.jface.viewers.TableViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerSorter;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.StackLayout;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IPartListener;
 import org.eclipse.ui.ISelectionListener;
 import org.eclipse.ui.ISharedImages;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchPart;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.part.ViewPart;

 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.Stack;

 /**
  * @author Eike Stepper
  */
 public class Net4jIntrospectorView extends ViewPart
     implements IPartListener, ISelectionListener, IDoubleClickListener, IListener
 {
   public static final String VIEW_ID = "org.eclipse.net4j.util.Net4jIntrospectorView"; //$NON-NLS-1$

   private static final Object[] NO_ELEMENTS = {};

   private static Net4jIntrospectorView instance;

   private TableViewer currentViewer;

   private TableViewer objectViewer;

   private TableViewer iterableViewer;

   private TableViewer arrayViewer;

   private TableViewer mapViewer;

   private Stack<Object> elements = new Stack<Object>();

   private Text classLabel;

   private Text objectLabel;

   private IAction backAction = new BackAction();

   private IAction modeAction = new ModeAction();

   private IAction containerAction = new ContainerAction();

   private IAction refreshAction = new RefreshAction();

   private StackLayout stackLayout;

   private Composite stacked;

   private IWorkbenchPart activePart;

   public Net4jIntrospectorView()
   {
   }

   @Override
   public void dispose()
   {
     IWorkbenchPage page = getSite().getPage();
     page.removePartListener(this);
     page.removeSelectionListener(this);
     super.dispose();
   }

   public static Net4jIntrospectorView getInstance()
   {
     return instance;
   }

   public static synchronized Net4jIntrospectorView getInstance(boolean show)
   {
     if (instance == null)
     {
       try
       {
         IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
         page.showView(VIEW_ID);
       }
       catch (Exception ex)
       {
         throw WrappedException.wrap(ex);
       }
     }

     return instance;
   }

   @Override
   public void createPartControl(Composite parent)
   {
     Color bg = parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND);
     Color gray = parent.getDisplay().getSystemColor(SWT.COLOR_DARK_BLUE);

     Composite composite = new Composite(parent, SWT.NONE);
     composite.setLayout(UIUtil.createGridLayout(1));

     Composite c = new Composite(composite, SWT.BORDER);
     c.setLayout(UIUtil.createGridLayout(2));
     c.setLayoutData(UIUtil.createGridData(true, false));

     classLabel = new Text(c, SWT.READ_ONLY);
     classLabel.setLayoutData(UIUtil.createGridData(false, false));
     classLabel.setBackground(bg);
     classLabel.setForeground(gray);

     objectLabel = new Text(c, SWT.READ_ONLY);
     objectLabel.setLayoutData(UIUtil.createGridData(true, false));
     objectLabel.setBackground(bg);

     stackLayout = new StackLayout();
     stacked = new Composite(composite, SWT.NONE);
     stacked.setLayoutData(UIUtil.createGridData());
     stacked.setLayout(stackLayout);

     objectViewer = createViewer(stacked);
     createObjectColmuns();
     objectViewer.addDoubleClickListener(this);
     objectViewer.setContentProvider(new ObjectContentProvider());
     objectViewer.setLabelProvider(new ObjectLabelProvider());
     objectViewer.setSorter(new NameSorter());
     objectViewer.setInput(getViewSite());

     iterableViewer = createViewer(stacked);
     createIterableColmuns();
     iterableViewer.addDoubleClickListener(this);
     iterableViewer.setContentProvider(new IterableContentProvider());
     iterableViewer.setLabelProvider(new IterableLabelProvider());
     iterableViewer.setInput(getViewSite());

     arrayViewer = createViewer(stacked);
     createArrayColmuns();
     arrayViewer.addDoubleClickListener(this);
     arrayViewer.setContentProvider(new ArrayContentProvider());
     arrayViewer.setLabelProvider(new ArrayLabelProvider());
     arrayViewer.setInput(getViewSite());

     mapViewer = createViewer(stacked);
     createMapColmuns();
     mapViewer.addDoubleClickListener(this);
     mapViewer.setContentProvider(new MapContentProvider());
     mapViewer.setLabelProvider(new MapLabelProvider());
     mapViewer.setSorter(new NameSorter());
     mapViewer.setInput(getViewSite());

     IActionBars bars = getViewSite().getActionBars();
     fillLocalPullDown(bars.getMenuManager());
     fillLocalToolBar(bars.getToolBarManager());

     IWorkbenchPage page = getSite().getPage();
     page.addPartListener(this);
     page.addSelectionListener(this);

     setCurrentViewer(objectViewer);
     instance = this;
   }

   private void setCurrentViewer(TableViewer viewer)
   {
     currentViewer = viewer;
     stackLayout.topControl = currentViewer.getControl();
     stacked.layout();
   }

   private TableViewer createViewer(Composite parent)
   {
     TableViewer viewer = new TableViewer(parent, SWT.FULL_SELECTION | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
     viewer.getTable().setLayoutData(UIUtil.createGridData());
     viewer.getTable().setHeaderVisible(true);
     viewer.getTable().setLinesVisible(true);
     return viewer;
   }

   public void refreshViewer()
   {
     UIUtil.refreshViewer(currentViewer);
   }

   public void partActivated(IWorkbenchPart part)
   {
     if (part == this)
     {
       return;
     }

     activePart = part;
     if (modeAction.isChecked())
     {
       elements.clear();
       setObject(activePart);
     }
   }

   public void partBroughtToTop(IWorkbenchPart part)
   {
   }

   public void partClosed(IWorkbenchPart part)
   {
   }

   public void partDeactivated(IWorkbenchPart part)
   {
     if (modeAction.isChecked())
     {
       if (part == activePart)
       {
         activePart = null;
         setObject(null);
       }
     }
   }

   public void partOpened(IWorkbenchPart part)
   {
   }

   public void selectionChanged(IWorkbenchPart part, ISelection sel)
   {
     if (part == this)
     {
       return;
     }

     if (modeAction.isChecked())
     {
       return;
     }

     if (sel instanceof IStructuredSelection)
     {
       IStructuredSelection ssel = (IStructuredSelection)sel;
       elements.clear();
       setObject(ssel.getFirstElement());
     }
     else
     {
       setObject(null);
     }
   }

   public void doubleClick(DoubleClickEvent event)
   {
     ISelection sel = event.getSelection();
     if (sel instanceof IStructuredSelection)
     {
       IStructuredSelection ssel = (IStructuredSelection)sel;
       Object element = ssel.getFirstElement();
       if (currentViewer == objectViewer && element instanceof Pair<?, ?>)
       {
         @SuppressWarnings("unchecked")
         Pair<Field, Object> pair = (Pair<Field, Object>)element;

         Field field = pair.getElement1();
         if (!field.getType().isPrimitive())
         {
           setObject(pair.getElement2());
         }
       }
       else if (currentViewer == mapViewer && element instanceof Map.Entry<?, ?>)
       {
         Map.Entry<?, ?> entry = (Map.Entry<?, ?>)element;
         setObject(entry.getValue());
       }
       else if (currentViewer == iterableViewer)
       {
         setObject(element);
       }
       else if (currentViewer == arrayViewer && element instanceof Pair<?, ?>)
       {
         @SuppressWarnings("unchecked")
         Pair<Integer, Object> pair = (Pair<Integer, Object>)element;
         setObject(pair.getElement2());
       }
     }
   }

   /**
    * Passing the focus request to the viewer's control.
    */
   @Override
   public void setFocus()
   {
     try
     {
       currentViewer.getControl().setFocus();
     }
     catch (RuntimeException ignore)
     {
     }
   }

   public void notifyEvent(IEvent event)
   {
     refreshViewer();
   }

   public void setObject(Object object)
   {
     EventUtil.removeListener(object, this);
     if (object != null)
     {
       if (!elements.isEmpty())
       {
         Object element = elements.peek();
         if (element != object)
         {
           EventUtil.removeListener(element, this);
           elements.push(object);
         }
       }
       else
       {
         elements.push(object);
       }
     }

     if (object == null)
     {
       classLabel.setText(""); //$NON-NLS-1$
       objectLabel.setText(""); //$NON-NLS-1$
       currentViewer = objectViewer;
     }
     else
     {
       EventUtil.addListener(object, this);
       String className = object.getClass().getName();
       classLabel.setText(className);

       String value = object.toString();
       if (value.startsWith(className + "@")) //$NON-NLS-1$
       {
         objectLabel.setText(value.substring(className.length()));
       }
       else
       {
         objectLabel.setText(value);
       }
     }

     classLabel.getParent().layout();
     backAction.setEnabled(elements.size() >= 2);

     if (object instanceof Map<?, ?>)
     {
       setCurrentViewer(mapViewer);
     }
     else if (object instanceof Iterable<?>)
     {
       setCurrentViewer(iterableViewer);
     }
     else if (object != null && object.getClass().isArray())
     {
       setCurrentViewer(arrayViewer);
     }
     else
     {
       setCurrentViewer(objectViewer);
     }

     refreshViewer();
   }

   private void createObjectColmuns()
   {
     Table table = objectViewer.getTable();
     String[] columnNames = { Messages.getString("Net4jIntrospectorView_4"), //$NON-NLS-1$
         Messages.getString("Net4jIntrospectorView_5"), Messages.getString("Net4jIntrospectorView_6"), //$NON-NLS-1$ //$NON-NLS-2$
         Messages.getString("Net4jIntrospectorView_7") }; //$NON-NLS-1$
     int[] columnWidths = { 200, 400, 300, 300 };
     createColumns(table, columnNames, columnWidths);
   }

   private void createMapColmuns()
   {
     Table table = mapViewer.getTable();
     String[] columnNames = { Messages.getString("Net4jIntrospectorView_8"), //$NON-NLS-1$
         Messages.getString("Net4jIntrospectorView_9"), Messages.getString("Net4jIntrospectorView_10") }; //$NON-NLS-1$ //$NON-NLS-2$
     int[] columnWidths = { 200, 400, 300 };
     createColumns(table, columnNames, columnWidths);
   }

   private void createIterableColmuns()
   {
     Table table = iterableViewer.getTable();
     String[] columnNames = { Messages.getString("Net4jIntrospectorView_11"), //$NON-NLS-1$
         Messages.getString("Net4jIntrospectorView_12") }; //$NON-NLS-1$
     int[] columnWidths = { 400, 300 };
     createColumns(table, columnNames, columnWidths);
   }

   private void createArrayColmuns()
   {
     Table table = arrayViewer.getTable();
     String[] columnNames = { Messages.getString("Net4jIntrospectorView_13"), //$NON-NLS-1$
         Messages.getString("Net4jIntrospectorView_14"), Messages.getString("Net4jIntrospectorView_15") }; //$NON-NLS-1$ //$NON-NLS-2$
     int[] columnWidths = { 50, 400, 300 };
     createColumns(table, columnNames, columnWidths);
   }

   private void createColumns(Table table, String[] columnNames, int[] columnWidths)
   {
     TableColumn[] columns = new TableColumn[columnNames.length];
     for (int i = 0; i < columns.length; i++)
     {
       TableColumn column = new TableColumn(table, SWT.LEFT, i);
       column.setText(columnNames[i]);
       column.setWidth(columnWidths[i]);
       column.setMoveable(true);
       column.setResizable(true);
     }
   }

   private void fillLocalPullDown(IMenuManager manager)
   {
   }

   private void fillLocalToolBar(IToolBarManager manager)
   {
     manager.add(backAction);
     manager.add(containerAction);
     manager.add(new Separator());
     manager.add(modeAction);
     manager.add(new Separator());
     manager.add(refreshAction);
   }

   /**
    * @author Eike Stepper
    */
   class BackAction extends Action
   {
     private BackAction()
     {
       super(Messages.getString("Net4jIntrospectorView_16")); //$NON-NLS-1$
       ISharedImages sharedImages = PlatformUI.getWorkbench().getSharedImages();
       setImageDescriptor(sharedImages.getImageDescriptor(ISharedImages.IMG_TOOL_BACK));
       setDisabledImageDescriptor(sharedImages.getImageDescriptor(ISharedImages.IMG_TOOL_BACK_DISABLED));
     }

     @Override
     public void run()
     {
       if (!elements.isEmpty())
       {
         elements.pop();
         if (!elements.isEmpty())
         {
           setObject(elements.peek());
         }
       }
     }
   }

   /**
    * @author Eike Stepper
    */
   class ModeAction extends Action
   {
     private ModeAction()
     {
       super(Messages.getString("Net4jIntrospectorView_17b"), AS_CHECK_BOX); //$NON-NLS-1$
       setImageDescriptor(SharedIcons.getDescriptor(SharedIcons.ETOOL_PART_MODE));
     }

     @Override
     public void run()
     {
       if (isChecked())
       {
         elements.clear();
         setObject(activePart);
       }
       else
       {
         setObject(null);
       }
     }
   }

   /**
    * @author Eike Stepper
    */
   class ContainerAction extends Action
   {
     private ContainerAction()
     {
       super(Messages.getString("Net4jIntrospectorView_17")); //$NON-NLS-1$
       setImageDescriptor(SharedIcons.getDescriptor(SharedIcons.VIEW_CONTAINER));
     }

     @Override
     public void run()
     {
       setObject(IPluginContainer.INSTANCE);
     }
   }

   /**
    * @author Eike Stepper
    */
   class RefreshAction extends Action
   {
     private RefreshAction()
     {
       super("Refresh"); //$NON-NLS-1$
       setImageDescriptor(SharedIcons.getDescriptor(SharedIcons.ETOOL_REFRESH));
     }

     @Override
     public void run()
     {
       refreshViewer();
     }
   }

   /**
    * @author Eike Stepper
    */
   abstract class AbstractContentProvider implements IStructuredContentProvider
   {
     public void inputChanged(Viewer v, Object oldInput, Object newInput)
     {
     }

     public void dispose()
     {
     }
   }

   /**
    * @author Eike Stepper
    */
   abstract class AbstractLabelProvider extends LabelProvider implements ITableLabelProvider
   {
     @Override
     public String getText(Object element)
     {
       return getColumnText(element, 0);
     }

     public Image getColumnImage(Object obj, int index)
     {
       return null;
     }

     @Override
     public Image getImage(Object obj)
     {
       return null;
     }
   }

   /**
    * @author Eike Stepper
    */
   class ObjectContentProvider extends AbstractContentProvider
   {
     public Object[] getElements(Object parent)
     {
       if (!elements.isEmpty())
       {
         try
         {
           return ReflectUtil.dumpToArray(elements.peek());
         }
         catch (RuntimeException ex)
         {
           OM.LOG.error(ex);
         }
       }

       return NO_ELEMENTS;
     }
   }

   /**
    * @author Eike Stepper
    */
   class ObjectLabelProvider extends AbstractLabelProvider
   {
     public String getColumnText(Object obj, int index)
     {
       if (obj instanceof Pair<?, ?>)
       {
         try
         {
           @SuppressWarnings("unchecked")
           Pair<Field, Object> pair = (Pair<Field, Object>)obj;

           Field field = pair.getElement1();
           Object value = pair.getElement2();

           switch (index)
           {
           case 0:
             return field.getName();
           case 1:
             return value == null ? Messages.getString("Net4jIntrospectorView_18") : value.toString(); //$NON-NLS-1$
           case 2:
             return field.getType().getName();
           case 3:
             return value == null ? Messages.getString("Net4jIntrospectorView_1") : value.getClass().getName(); //$NON-NLS-1$
           }
         }
         catch (RuntimeException ex)
         {
           OM.LOG.error(ex);
         }
       }

       return ""; //$NON-NLS-1$
     }
   }

   /**
    * @author Eike Stepper
    */
   class IterableContentProvider extends AbstractContentProvider
   {
     public Object[] getElements(Object parent)
     {
       if (!elements.isEmpty())
       {
         Object element = elements.peek();
         if (element instanceof Iterable<?>)
         {
           List<Object> result = new ArrayList<Object>();
           for (Object object : (Iterable<?>)element)
           {
             result.add(object);
           }

           return result.toArray();
         }
       }

       return NO_ELEMENTS;
     }
   }

   /**
    * @author Eike Stepper
    */
   class IterableLabelProvider extends AbstractLabelProvider
   {
     public String getColumnText(Object obj, int index)
     {
       switch (index)
       {
       case 0:
         return obj == null ? Messages.getString("Net4jIntrospectorView_21") : obj.toString(); //$NON-NLS-1$
       case 1:
         return obj == null ? Messages.getString("Net4jIntrospectorView_22") : obj.getClass().getName(); //$NON-NLS-1$
       }

       return ""; //$NON-NLS-1$
     }
   }

   /**
    * @author Eike Stepper
    */
   class ArrayContentProvider extends AbstractContentProvider
   {
     @SuppressWarnings("unchecked")
     public Object[] getElements(Object parent)
     {
       if (!elements.isEmpty())
       {
         Object element = elements.peek();
         if (element.getClass().isArray())
         {
           Object[] array = (Object[])element;
           Pair<Integer, Object>[] result = new Pair[array.length];
           for (int i = 0; i < array.length; i++)
           {
             result[i] = Pair.create(i, array[i]);
           }

           return result;
         }
       }

       return NO_ELEMENTS;
     }
   }

   /**
    * @author Eike Stepper
    */
   class ArrayLabelProvider extends AbstractLabelProvider
   {
     public String getColumnText(Object obj, int index)
     {
       if (obj instanceof Pair<?, ?>)
       {
         try
         {
           @SuppressWarnings("unchecked")
           Pair<Integer, Object> pair = (Pair<Integer, Object>)obj;

           int i = pair.getElement1();
           Object value = pair.getElement2();
           switch (index)
           {
           case 0:
             return String.valueOf(i);
           case 1:
             return value == null ? Messages.getString("Net4jIntrospectorView_24") : value.toString(); //$NON-NLS-1$
           case 2:
             return value == null ? Messages.getString("Net4jIntrospectorView_25") : value.getClass().getName(); //$NON-NLS-1$
           }
         }
         catch (RuntimeException ex)
         {
           OM.LOG.error(ex);
         }
       }

       return ""; //$NON-NLS-1$
     }
   }

   /**
    * @author Eike Stepper
    */
   class MapContentProvider extends AbstractContentProvider
   {
     public Object[] getElements(Object parent)
     {
       if (!elements.isEmpty())
       {
         Object element = elements.peek();
         if (element instanceof Map<?, ?>)
         {
           return ((Map<?, ?>)element).entrySet().toArray();
         }
       }

       return NO_ELEMENTS;
     }
   }

   /**
    * @author Eike Stepper
    */
   class MapLabelProvider extends AbstractLabelProvider
   {
     public String getColumnText(Object obj, int index)
     {
       if (obj instanceof Map.Entry<?, ?>)
       {
         Map.Entry<?, ?> entry = (Map.Entry<?, ?>)obj;
         Object key = entry.getKey();
         Object value = entry.getValue();
         switch (index)
         {
         case 0:
           return key == null ? Messages.getString("Net4jIntrospectorView_27") : key.toString(); //$NON-NLS-1$
         case 1:
           return value == null ? Messages.getString("Net4jIntrospectorView_28") : value.toString(); //$NON-NLS-1$
         case 2:
           return value == null ? Messages.getString("Net4jIntrospectorView_29") : value.getClass().getName(); //$NON-NLS-1$
         }
       }

       return ""; //$NON-NLS-1$
     }
   }

   /**
    * @author Eike Stepper
    */
   class NameSorter extends ViewerSorter
   {
   }
 }
	/*
	* Copyright (c) 2007-2013 Eike Stepper (Berlin, Germany) and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* Eike Stepper - initial API and implementation
	*/
	package org.eclipse.net4j.util.internal.ui.views;

	import org.eclipse.net4j.ui.shared.SharedIcons;
	import org.eclipse.net4j.util.ReflectUtil;
	import org.eclipse.net4j.util.WrappedException;
	import org.eclipse.net4j.util.collection.Pair;
	import org.eclipse.net4j.util.container.IPluginContainer;
	import org.eclipse.net4j.util.event.EventUtil;
	import org.eclipse.net4j.util.event.IEvent;
	import org.eclipse.net4j.util.event.IListener;
	import org.eclipse.net4j.util.internal.ui.bundle.OM;
	import org.eclipse.net4j.util.internal.ui.messages.Messages;
	import org.eclipse.net4j.util.ui.UIUtil;

	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.IAction;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.action.IToolBarManager;
	import org.eclipse.jface.action.Separator;
	import org.eclipse.jface.viewers.DoubleClickEvent;
	import org.eclipse.jface.viewers.IDoubleClickListener;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.IStructuredContentProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITableLabelProvider;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.jface.viewers.TableViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerSorter;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.StackLayout;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Table;
	import org.eclipse.swt.widgets.TableColumn;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.ui.IActionBars;
	import org.eclipse.ui.IPartListener;
	import org.eclipse.ui.ISelectionListener;
	import org.eclipse.ui.ISharedImages;
	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.IWorkbenchPart;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.part.ViewPart;

	import java.lang.reflect.Field;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Map;
	import java.util.Stack;

	/**
	* @author Eike Stepper
	*/
	public class Net4jIntrospectorView extends ViewPart
	implements IPartListener, ISelectionListener, IDoubleClickListener, IListener
	{
	public static final String VIEW_ID = "org.eclipse.net4j.util.Net4jIntrospectorView"; //$NON-NLS-1$

	private static final Object[] NO_ELEMENTS = {};

	private static Net4jIntrospectorView instance;

	private TableViewer currentViewer;

	private TableViewer objectViewer;

	private TableViewer iterableViewer;

	private TableViewer arrayViewer;

	private TableViewer mapViewer;

	private Stack<Object> elements = new Stack<Object>();

	private Text classLabel;

	private Text objectLabel;

	private IAction backAction = new BackAction();

	private IAction modeAction = new ModeAction();

	private IAction containerAction = new ContainerAction();

	private IAction refreshAction = new RefreshAction();

	private StackLayout stackLayout;

	private Composite stacked;

	private IWorkbenchPart activePart;

	public Net4jIntrospectorView()
	{
	}

	@Override
	public void dispose()
	{
	IWorkbenchPage page = getSite().getPage();
	page.removePartListener(this);
	page.removeSelectionListener(this);
	super.dispose();
	}

	public static Net4jIntrospectorView getInstance()
	{
	return instance;
	}

	public static synchronized Net4jIntrospectorView getInstance(boolean show)
	{
	if (instance == null)
	{
	try
	{
	IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
	page.showView(VIEW_ID);
	}
	catch (Exception ex)
	{
	throw WrappedException.wrap(ex);
	}
	}

	return instance;
	}

	@Override
	public void createPartControl(Composite parent)
	{
	Color bg = parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND);
	Color gray = parent.getDisplay().getSystemColor(SWT.COLOR_DARK_BLUE);

	Composite composite = new Composite(parent, SWT.NONE);
	composite.setLayout(UIUtil.createGridLayout(1));

	Composite c = new Composite(composite, SWT.BORDER);
	c.setLayout(UIUtil.createGridLayout(2));
	c.setLayoutData(UIUtil.createGridData(true, false));

	classLabel = new Text(c, SWT.READ_ONLY);
	classLabel.setLayoutData(UIUtil.createGridData(false, false));
	classLabel.setBackground(bg);
	classLabel.setForeground(gray);

	objectLabel = new Text(c, SWT.READ_ONLY);
	objectLabel.setLayoutData(UIUtil.createGridData(true, false));
	objectLabel.setBackground(bg);

	stackLayout = new StackLayout();
	stacked = new Composite(composite, SWT.NONE);
	stacked.setLayoutData(UIUtil.createGridData());
	stacked.setLayout(stackLayout);

	objectViewer = createViewer(stacked);
	createObjectColmuns();
	objectViewer.addDoubleClickListener(this);
	objectViewer.setContentProvider(new ObjectContentProvider());
	objectViewer.setLabelProvider(new ObjectLabelProvider());
	objectViewer.setSorter(new NameSorter());
	objectViewer.setInput(getViewSite());

	iterableViewer = createViewer(stacked);
	createIterableColmuns();
	iterableViewer.addDoubleClickListener(this);
	iterableViewer.setContentProvider(new IterableContentProvider());
	iterableViewer.setLabelProvider(new IterableLabelProvider());
	iterableViewer.setInput(getViewSite());

	arrayViewer = createViewer(stacked);
	createArrayColmuns();
	arrayViewer.addDoubleClickListener(this);
	arrayViewer.setContentProvider(new ArrayContentProvider());
	arrayViewer.setLabelProvider(new ArrayLabelProvider());
	arrayViewer.setInput(getViewSite());

	mapViewer = createViewer(stacked);
	createMapColmuns();
	mapViewer.addDoubleClickListener(this);
	mapViewer.setContentProvider(new MapContentProvider());
	mapViewer.setLabelProvider(new MapLabelProvider());
	mapViewer.setSorter(new NameSorter());
	mapViewer.setInput(getViewSite());

	IActionBars bars = getViewSite().getActionBars();
	fillLocalPullDown(bars.getMenuManager());
	fillLocalToolBar(bars.getToolBarManager());

	IWorkbenchPage page = getSite().getPage();
	page.addPartListener(this);
	page.addSelectionListener(this);

	setCurrentViewer(objectViewer);
	instance = this;
	}

	private void setCurrentViewer(TableViewer viewer)
	{
	currentViewer = viewer;
	stackLayout.topControl = currentViewer.getControl();
	stacked.layout();
	}

	private TableViewer createViewer(Composite parent)
	{
	TableViewer viewer = new TableViewer(parent, SWT.FULL_SELECTION \| SWT.MULTI \| SWT.H_SCROLL \| SWT.V_SCROLL);
	viewer.getTable().setLayoutData(UIUtil.createGridData());
	viewer.getTable().setHeaderVisible(true);
	viewer.getTable().setLinesVisible(true);
	return viewer;
	}

	public void refreshViewer()
	{
	UIUtil.refreshViewer(currentViewer);
	}

	public void partActivated(IWorkbenchPart part)
	{
	if (part == this)
	{
	return;
	}

	activePart = part;
	if (modeAction.isChecked())
	{
	elements.clear();
	setObject(activePart);
	}
	}

	public void partBroughtToTop(IWorkbenchPart part)
	{
	}

	public void partClosed(IWorkbenchPart part)
	{
	}

	public void partDeactivated(IWorkbenchPart part)
	{
	if (modeAction.isChecked())
	{
	if (part == activePart)
	{
	activePart = null;
	setObject(null);
	}
	}
	}

	public void partOpened(IWorkbenchPart part)
	{
	}

	public void selectionChanged(IWorkbenchPart part, ISelection sel)
	{
	if (part == this)
	{
	return;
	}

	if (modeAction.isChecked())
	{
	return;
	}

	if (sel instanceof IStructuredSelection)
	{
	IStructuredSelection ssel = (IStructuredSelection)sel;
	elements.clear();
	setObject(ssel.getFirstElement());
	}
	else
	{
	setObject(null);
	}
	}

	public void doubleClick(DoubleClickEvent event)
	{
	ISelection sel = event.getSelection();
	if (sel instanceof IStructuredSelection)
	{
	IStructuredSelection ssel = (IStructuredSelection)sel;
	Object element = ssel.getFirstElement();
	if (currentViewer == objectViewer && element instanceof Pair<?, ?>)
	{
	@SuppressWarnings("unchecked")
	Pair<Field, Object> pair = (Pair<Field, Object>)element;

	Field field = pair.getElement1();
	if (!field.getType().isPrimitive())
	{
	setObject(pair.getElement2());
	}
	}
	else if (currentViewer == mapViewer && element instanceof Map.Entry<?, ?>)
	{
	Map.Entry<?, ?> entry = (Map.Entry<?, ?>)element;
	setObject(entry.getValue());
	}
	else if (currentViewer == iterableViewer)
	{
	setObject(element);
	}
	else if (currentViewer == arrayViewer && element instanceof Pair<?, ?>)
	{
	@SuppressWarnings("unchecked")
	Pair<Integer, Object> pair = (Pair<Integer, Object>)element;
	setObject(pair.getElement2());
	}
	}
	}

	/**
	* Passing the focus request to the viewer's control.
	*/
	@Override
	public void setFocus()
	{
	try
	{
	currentViewer.getControl().setFocus();
	}
	catch (RuntimeException ignore)
	{
	}
	}

	public void notifyEvent(IEvent event)
	{
	refreshViewer();
	}

	public void setObject(Object object)
	{
	EventUtil.removeListener(object, this);
	if (object != null)
	{
	if (!elements.isEmpty())
	{
	Object element = elements.peek();
	if (element != object)
	{
	EventUtil.removeListener(element, this);
	elements.push(object);
	}
	}
	else
	{
	elements.push(object);
	}
	}

	if (object == null)
	{
	classLabel.setText(""); //$NON-NLS-1$
	objectLabel.setText(""); //$NON-NLS-1$
	currentViewer = objectViewer;
	}
	else
	{
	EventUtil.addListener(object, this);
	String className = object.getClass().getName();
	classLabel.setText(className);

	String value = object.toString();
	if (value.startsWith(className + "@")) //$NON-NLS-1$
	{
	objectLabel.setText(value.substring(className.length()));
	}
	else
	{
	objectLabel.setText(value);
	}
	}

	classLabel.getParent().layout();
	backAction.setEnabled(elements.size() >= 2);

	if (object instanceof Map<?, ?>)
	{
	setCurrentViewer(mapViewer);
	}
	else if (object instanceof Iterable<?>)
	{
	setCurrentViewer(iterableViewer);
	}
	else if (object != null && object.getClass().isArray())
	{
	setCurrentViewer(arrayViewer);
	}
	else
	{
	setCurrentViewer(objectViewer);
	}

	refreshViewer();
	}

	private void createObjectColmuns()
	{
	Table table = objectViewer.getTable();
	String[] columnNames = { Messages.getString("Net4jIntrospectorView_4"), //$NON-NLS-1$
	Messages.getString("Net4jIntrospectorView_5"), Messages.getString("Net4jIntrospectorView_6"), //$NON-NLS-1$ //$NON-NLS-2$
	Messages.getString("Net4jIntrospectorView_7") }; //$NON-NLS-1$
	int[] columnWidths = { 200, 400, 300, 300 };
	createColumns(table, columnNames, columnWidths);
	}

	private void createMapColmuns()
	{
	Table table = mapViewer.getTable();
	String[] columnNames = { Messages.getString("Net4jIntrospectorView_8"), //$NON-NLS-1$
	Messages.getString("Net4jIntrospectorView_9"), Messages.getString("Net4jIntrospectorView_10") }; //$NON-NLS-1$ //$NON-NLS-2$
	int[] columnWidths = { 200, 400, 300 };
	createColumns(table, columnNames, columnWidths);
	}

	private void createIterableColmuns()
	{
	Table table = iterableViewer.getTable();
	String[] columnNames = { Messages.getString("Net4jIntrospectorView_11"), //$NON-NLS-1$
	Messages.getString("Net4jIntrospectorView_12") }; //$NON-NLS-1$
	int[] columnWidths = { 400, 300 };
	createColumns(table, columnNames, columnWidths);
	}

	private void createArrayColmuns()
	{
	Table table = arrayViewer.getTable();
	String[] columnNames = { Messages.getString("Net4jIntrospectorView_13"), //$NON-NLS-1$
	Messages.getString("Net4jIntrospectorView_14"), Messages.getString("Net4jIntrospectorView_15") }; //$NON-NLS-1$ //$NON-NLS-2$
	int[] columnWidths = { 50, 400, 300 };
	createColumns(table, columnNames, columnWidths);
	}

	private void createColumns(Table table, String[] columnNames, int[] columnWidths)
	{
	TableColumn[] columns = new TableColumn[columnNames.length];
	for (int i = 0; i < columns.length; i++)
	{
	TableColumn column = new TableColumn(table, SWT.LEFT, i);
	column.setText(columnNames[i]);
	column.setWidth(columnWidths[i]);
	column.setMoveable(true);
	column.setResizable(true);
	}
	}

	private void fillLocalPullDown(IMenuManager manager)
	{
	}

	private void fillLocalToolBar(IToolBarManager manager)
	{
	manager.add(backAction);
	manager.add(containerAction);
	manager.add(new Separator());
	manager.add(modeAction);
	manager.add(new Separator());
	manager.add(refreshAction);
	}

	/**
	* @author Eike Stepper
	*/
	class BackAction extends Action
	{
	private BackAction()
	{
	super(Messages.getString("Net4jIntrospectorView_16")); //$NON-NLS-1$
	ISharedImages sharedImages = PlatformUI.getWorkbench().getSharedImages();
	setImageDescriptor(sharedImages.getImageDescriptor(ISharedImages.IMG_TOOL_BACK));
	setDisabledImageDescriptor(sharedImages.getImageDescriptor(ISharedImages.IMG_TOOL_BACK_DISABLED));
	}

	@Override
	public void run()
	{
	if (!elements.isEmpty())
	{
	elements.pop();
	if (!elements.isEmpty())
	{
	setObject(elements.peek());
	}
	}
	}
	}

	/**
	* @author Eike Stepper
	*/
	class ModeAction extends Action
	{
	private ModeAction()
	{
	super(Messages.getString("Net4jIntrospectorView_17b"), AS_CHECK_BOX); //$NON-NLS-1$
	setImageDescriptor(SharedIcons.getDescriptor(SharedIcons.ETOOL_PART_MODE));
	}

	@Override
	public void run()
	{
	if (isChecked())
	{
	elements.clear();
	setObject(activePart);
	}
	else
	{
	setObject(null);
	}
	}
	}

	/**
	* @author Eike Stepper
	*/
	class ContainerAction extends Action
	{
	private ContainerAction()
	{
	super(Messages.getString("Net4jIntrospectorView_17")); //$NON-NLS-1$
	setImageDescriptor(SharedIcons.getDescriptor(SharedIcons.VIEW_CONTAINER));
	}

	@Override
	public void run()
	{
	setObject(IPluginContainer.INSTANCE);
	}
	}

	/**
	* @author Eike Stepper
	*/
	class RefreshAction extends Action
	{
	private RefreshAction()
	{
	super("Refresh"); //$NON-NLS-1$
	setImageDescriptor(SharedIcons.getDescriptor(SharedIcons.ETOOL_REFRESH));
	}

	@Override
	public void run()
	{
	refreshViewer();
	}
	}

	/**
	* @author Eike Stepper
	*/
	abstract class AbstractContentProvider implements IStructuredContentProvider
	{
	public void inputChanged(Viewer v, Object oldInput, Object newInput)
	{
	}

	public void dispose()
	{
	}
	}

	/**
	* @author Eike Stepper
	*/
	abstract class AbstractLabelProvider extends LabelProvider implements ITableLabelProvider
	{
	@Override
	public String getText(Object element)
	{
	return getColumnText(element, 0);
	}

	public Image getColumnImage(Object obj, int index)
	{
	return null;
	}

	@Override
	public Image getImage(Object obj)
	{
	return null;
	}
	}

	/**
	* @author Eike Stepper
	*/
	class ObjectContentProvider extends AbstractContentProvider
	{
	public Object[] getElements(Object parent)
	{
	if (!elements.isEmpty())
	{
	try
	{
	return ReflectUtil.dumpToArray(elements.peek());
	}
	catch (RuntimeException ex)
	{
	OM.LOG.error(ex);
	}
	}

	return NO_ELEMENTS;
	}
	}

	/**
	* @author Eike Stepper
	*/
	class ObjectLabelProvider extends AbstractLabelProvider
	{
	public String getColumnText(Object obj, int index)
	{
	if (obj instanceof Pair<?, ?>)
	{
	try
	{
	@SuppressWarnings("unchecked")
	Pair<Field, Object> pair = (Pair<Field, Object>)obj;

	Field field = pair.getElement1();
	Object value = pair.getElement2();

	switch (index)
	{
	case 0:
	return field.getName();
	case 1:
	return value == null ? Messages.getString("Net4jIntrospectorView_18") : value.toString(); //$NON-NLS-1$
	case 2:
	return field.getType().getName();
	case 3:
	return value == null ? Messages.getString("Net4jIntrospectorView_1") : value.getClass().getName(); //$NON-NLS-1$
	}
	}
	catch (RuntimeException ex)
	{
	OM.LOG.error(ex);
	}
	}

	return ""; //$NON-NLS-1$
	}
	}

	/**
	* @author Eike Stepper
	*/
	class IterableContentProvider extends AbstractContentProvider
	{
	public Object[] getElements(Object parent)
	{
	if (!elements.isEmpty())
	{
	Object element = elements.peek();
	if (element instanceof Iterable<?>)
	{
	List<Object> result = new ArrayList<Object>();
	for (Object object : (Iterable<?>)element)
	{
	result.add(object);
	}

	return result.toArray();
	}
	}

	return NO_ELEMENTS;
	}
	}

	/**
	* @author Eike Stepper
	*/
	class IterableLabelProvider extends AbstractLabelProvider
	{
	public String getColumnText(Object obj, int index)
	{
	switch (index)
	{
	case 0:
	return obj == null ? Messages.getString("Net4jIntrospectorView_21") : obj.toString(); //$NON-NLS-1$
	case 1:
	return obj == null ? Messages.getString("Net4jIntrospectorView_22") : obj.getClass().getName(); //$NON-NLS-1$
	}

	return ""; //$NON-NLS-1$
	}
	}

	/**
	* @author Eike Stepper
	*/
	class ArrayContentProvider extends AbstractContentProvider
	{
	@SuppressWarnings("unchecked")
	public Object[] getElements(Object parent)
	{
	if (!elements.isEmpty())
	{
	Object element = elements.peek();
	if (element.getClass().isArray())
	{
	Object[] array = (Object[])element;
	Pair<Integer, Object>[] result = new Pair[array.length];
	for (int i = 0; i < array.length; i++)
	{
	result[i] = Pair.create(i, array[i]);
	}

	return result;
	}
	}

	return NO_ELEMENTS;
	}
	}

	/**
	* @author Eike Stepper
	*/
	class ArrayLabelProvider extends AbstractLabelProvider
	{
	public String getColumnText(Object obj, int index)
	{
	if (obj instanceof Pair<?, ?>)
	{
	try
	{
	@SuppressWarnings("unchecked")
	Pair<Integer, Object> pair = (Pair<Integer, Object>)obj;

	int i = pair.getElement1();
	Object value = pair.getElement2();
	switch (index)
	{
	case 0:
	return String.valueOf(i);
	case 1:
	return value == null ? Messages.getString("Net4jIntrospectorView_24") : value.toString(); //$NON-NLS-1$
	case 2:
	return value == null ? Messages.getString("Net4jIntrospectorView_25") : value.getClass().getName(); //$NON-NLS-1$
	}
	}
	catch (RuntimeException ex)
	{
	OM.LOG.error(ex);
	}
	}

	return ""; //$NON-NLS-1$
	}
	}

	/**
	* @author Eike Stepper
	*/
	class MapContentProvider extends AbstractContentProvider
	{
	public Object[] getElements(Object parent)
	{
	if (!elements.isEmpty())
	{
	Object element = elements.peek();
	if (element instanceof Map<?, ?>)
	{
	return ((Map<?, ?>)element).entrySet().toArray();
	}
	}

	return NO_ELEMENTS;
	}
	}

	/**
	* @author Eike Stepper
	*/
	class MapLabelProvider extends AbstractLabelProvider
	{
	public String getColumnText(Object obj, int index)
	{
	if (obj instanceof Map.Entry<?, ?>)
	{
	Map.Entry<?, ?> entry = (Map.Entry<?, ?>)obj;
	Object key = entry.getKey();
	Object value = entry.getValue();
	switch (index)
	{
	case 0:
	return key == null ? Messages.getString("Net4jIntrospectorView_27") : key.toString(); //$NON-NLS-1$
	case 1:
	return value == null ? Messages.getString("Net4jIntrospectorView_28") : value.toString(); //$NON-NLS-1$
	case 2:
	return value == null ? Messages.getString("Net4jIntrospectorView_29") : value.getClass().getName(); //$NON-NLS-1$
	}
	}

	return ""; //$NON-NLS-1$
	}
	}

	/**
	* @author Eike Stepper
	*/
	class NameSorter extends ViewerSorter
	{
	}
	}