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/***************************************************************************
 * Copyright (c) 2004 - 2007 Eike Stepper, Germany.
 * 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.internal.debug.views;

import org.eclipse.net4j.internal.debug.bundle.OM;
import org.eclipse.net4j.util.ReflectUtil;
import org.eclipse.net4j.util.collection.Pair;

import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.dialogs.MessageDialog;
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.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.part.ViewPart;

import java.lang.reflect.Field;

/**
 * @author Eike Stepper
 */
public class IntrospectorView extends ViewPart implements ISelectionListener
{
  private static final Object[] NO_ELEMENTS = {};

  private TableViewer viewer;

  private Object selection;

  public IntrospectorView()
  {
  }

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

  @Override
  public void createPartControl(Composite parent)
  {
    viewer = new TableViewer(parent, SWT.FULL_SELECTION | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
    viewer.getTable().setHeaderVisible(true);
    viewer.getTable().setLinesVisible(true);
    createColmuns(viewer);
    viewer.setContentProvider(new ViewContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());
    viewer.setInput(getViewSite());

    makeActions();
    hookContextMenu();
    hookDoubleClickAction();
    contributeToActionBars();

    getSite().getPage().addSelectionListener(this);
    // getSite().getPage().getSelectionProvider().addSelectionChangedListener(this);
  }

  protected void createColmuns(TableViewer viewer)
  {
    final String[] columnNames = { "Field", "Value" };
    final int[] columnWidths = { 200, 400 };
    TableColumn[] columns = new TableColumn[columnNames.length];
    for (int i = 0; i < columns.length; i++)
    {
      TableColumn column = new TableColumn(viewer.getTable(), SWT.LEFT, i);
      column.setText(columnNames[i]);
      column.setWidth(columnWidths[i]);
      column.setMoveable(true);
      column.setResizable(true);
    }
  }

  public void refreshViewer()
  {
    if (isViewerAlive())
    {
      getSite().getShell().getDisplay().asyncExec(new Runnable()
      {
        public void run()
        {
          if (isViewerAlive())
          {
            viewer.refresh();
          }
        }
      });
    }
  }

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

    if (sel instanceof IStructuredSelection)
    {
      IStructuredSelection ssel = (IStructuredSelection)sel;
      selection = ssel.getFirstElement();
    }
    else
    {
      selection = null;
    }

    refreshViewer();
  }

  private boolean isViewerAlive()
  {
    return viewer != null && viewer.getControl() != null && !viewer.getControl().isDisposed();
  }

  private void hookContextMenu()
  {
    MenuManager menuMgr = new MenuManager("#PopupMenu");
    menuMgr.setRemoveAllWhenShown(true);
    menuMgr.addMenuListener(new IMenuListener()
    {
      public void menuAboutToShow(IMenuManager manager)
      {
        IntrospectorView.this.fillContextMenu(manager);
      }
    });

    Menu menu = menuMgr.createContextMenu(viewer.getControl());
    viewer.getControl().setMenu(menu);
    getSite().registerContextMenu(menuMgr, viewer);
  }

  private void contributeToActionBars()
  {
    IActionBars bars = getViewSite().getActionBars();
    fillLocalPullDown(bars.getMenuManager());
    fillLocalToolBar(bars.getToolBarManager());
  }

  private void fillLocalPullDown(IMenuManager manager)
  {
  }

  private void fillContextMenu(IMenuManager manager)
  {
    manager.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS));
  }

  private void fillLocalToolBar(IToolBarManager manager)
  {
  }

  private void makeActions()
  {
  }

  private void hookDoubleClickAction()
  {
    viewer.addDoubleClickListener(new IDoubleClickListener()
    {
      public void doubleClick(DoubleClickEvent event)
      {
      }
    });
  }

  @SuppressWarnings("unused")
  private void showMessage(String message)
  {
    MessageDialog.openInformation(viewer.getControl().getShell(), "Remote Traces", message);
  }

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

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

    public void dispose()
    {
    }

    public Object[] getElements(Object parent)
    {
      if (selection != null)
      {
        try
        {
          return ReflectUtil.dumpToArray(selection);
        }
        catch (RuntimeException ex)
        {
          OM.LOG.error(ex);
        }
      }

      return NO_ELEMENTS;
    }
  }

  /**
   * @author Eike Stepper
   */
  class ViewLabelProvider extends LabelProvider implements ITableLabelProvider
  {
    public ViewLabelProvider()
    {
    }

    public String getColumnText(Object obj, int index)
    {
      if (obj instanceof Pair)
      {
        try
        {
          Pair<Field, Object> pair = (Pair)obj;
          switch (index)
          {
          case 0:
            return pair.getElement1().getName();
          case 1:
            Object value = pair.getElement2();
            return value == null ? "null" : value.toString();
          }
        }
        catch (RuntimeException ex)
        {
          OM.LOG.error(ex);
        }
      }

      return getText(obj);
    }

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

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

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

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