bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/about/AboutPluginsPage.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2009 IBM Corporation 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:
  *		IBM Corporation - initial API and implementation
  *  	Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog
  * 		font should be activated and used by other components.
  *******************************************************************************/
 package org.eclipse.ui.internal.about;

 import java.io.IOException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.util.ConfigureColumns;
 import org.eclipse.jface.viewers.ArrayContentProvider;
 import org.eclipse.jface.viewers.IBaseLabelProvider;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.ITableLabelProvider;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.jface.viewers.LabelProviderChangedEvent;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.TableViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerComparator;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.SashForm;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.internal.IWorkbenchGraphicConstants;
 import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
 import org.eclipse.ui.internal.WorkbenchImages;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.misc.StatusUtil;
 import org.eclipse.ui.internal.util.BundleUtility;
 import org.eclipse.ui.progress.WorkbenchJob;
 import org.eclipse.ui.statushandlers.StatusManager;
 import org.osgi.framework.Bundle;

 /**
  * Displays information about the product plugins.
  *
  * PRIVATE this class is internal to the ide
  */
 public class AboutPluginsPage extends ProductInfoPage {

 	public class BundleTableLabelProvider extends LabelProvider implements
 			ITableLabelProvider {

 		/**
 		 * Queue containing bundle signing info to be resolved.
 		 */
 		private LinkedList resolveQueue = new LinkedList();

 		/**
 		 * Queue containing bundle data that's been resolve and needs updating.
 		 */
 		private List updateQueue = new ArrayList();

 		/*
 		 * this job will attempt to discover the signing state of a given bundle
 		 * and then send it along to the update job
 		 */
 		private Job resolveJob = new Job(AboutPluginsPage.class.getName()) {
 			{
 				setSystem(true);
 				setPriority(Job.SHORT);
 			}

 			protected IStatus run(IProgressMonitor monitor) {
 				while (true) {
 					// If the UI has not been created, nothing to do.
 					if (vendorInfo == null)
 						return Status.OK_STATUS;
 					// If the UI has been disposed since we were asked to
 					// render, nothing to do.
 					Table table = vendorInfo.getTable();
 					// the table has been disposed since we were asked to render
 					if (table == null || table.isDisposed())
 						return Status.OK_STATUS;
 					AboutBundleData data = null;
 					synchronized (resolveQueue) {
 						if (resolveQueue.isEmpty())
 							return Status.OK_STATUS;
 						data = (AboutBundleData) resolveQueue.removeFirst();
 					}
 					try {
 						// following is an expensive call
 						data.isSigned();

 						synchronized (updateQueue) {
 							updateQueue.add(data);
 						}
 						// start the update job
 						updateJob.schedule();
 					} catch (IllegalStateException e) {
 						// the bundle we're testing has been unloaded. Do
 						// nothing.
 					}
 				}
 			}
 		};

 		/*
 		 * this job is responsible for feeding label change events into the
 		 * viewer as they become available from the resolve job
 		 */
 		private Job updateJob = new WorkbenchJob(PlatformUI.getWorkbench()
 				.getDisplay(), AboutPluginsPage.class.getName()) {
 			{
 				setSystem(true);
 				setPriority(Job.DECORATE);
 			}

 			/*
 			 * (non-Javadoc)
 			 *
 			 * @see
 			 * org.eclipse.ui.progress.UIJob#runInUIThread(org.eclipse.core.
 			 * runtime.IProgressMonitor)
 			 */
 			public IStatus runInUIThread(IProgressMonitor monitor) {
 				while (true) {
 					Control page = getControl();
 					// the page has gone down since we were asked to render
 					if (page == null || page.isDisposed())
 						return Status.OK_STATUS;
 					AboutBundleData[] data = null;
 					synchronized (updateQueue) {
 						if (updateQueue.isEmpty())
 							return Status.OK_STATUS;

 						data = (AboutBundleData[]) updateQueue
 								.toArray(new AboutBundleData[updateQueue.size()]);
 						updateQueue.clear();

 					}
 					fireLabelProviderChanged(new LabelProviderChangedEvent(
 							BundleTableLabelProvider.this, data));
 				}
 			}
 		};

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see
 		 * org.eclipse.jface.viewers.ITableLabelProvider#getColumnImage(java
 		 * .lang.Object, int)
 		 */
 		public Image getColumnImage(Object element, int columnIndex) {
 			if (columnIndex == 0) {
 				if (element instanceof AboutBundleData) {
 					final AboutBundleData data = (AboutBundleData) element;
 					if (data.isSignedDetermined()) {
 						return WorkbenchImages
 								.getImage(data.isSigned() ? IWorkbenchGraphicConstants.IMG_OBJ_SIGNED_YES
 										: IWorkbenchGraphicConstants.IMG_OBJ_SIGNED_NO);
 					}

 					synchronized (resolveQueue) {
 						resolveQueue.add(data);
 					}
 					resolveJob.schedule();

 					return WorkbenchImages
 							.getImage(IWorkbenchGraphicConstants.IMG_OBJ_SIGNED_UNKNOWN);
 				}
 			}
 			return null;
 		}

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see
 		 * org.eclipse.jface.viewers.ITableLabelProvider#getColumnText(java.
 		 * lang.Object, int)
 		 */
 		public String getColumnText(Object element, int columnIndex) {
 			if (element instanceof AboutBundleData) {
 				AboutBundleData data = (AboutBundleData) element;
 				switch (columnIndex) {
 				case 1:
 					return data.getProviderName();
 				case 2:
 					return data.getName();
 				case 3:
 					return data.getVersion();
 				case 4:
 					return data.getId();
 				}
 			}
 			return ""; //$NON-NLS-1$
 		}
 	}

 	// This id is used when the page is created inside its own dialog
 	private static final String ID = "productInfo.plugins"; //$NON-NLS-1$

 	/**
 	 * Table height in dialog units (value 200).
 	 */
 	private static final int TABLE_HEIGHT = 200;

 	private final static int MORE_ID = IDialogConstants.CLIENT_ID + 1;
 	private final static int SIGNING_ID = MORE_ID + 1;
 	private final static int COLUMNS_ID = MORE_ID + 2;

 	private static final IPath baseNLPath = new Path("$nl$"); //$NON-NLS-1$

 	private static final String PLUGININFO = "about.html"; //$NON-NLS-1$

 	private static final int PLUGIN_NAME_COLUMN_INDEX = 2;

 	private static final int SIGNING_AREA_PERCENTAGE = 30;

 	private TableViewer vendorInfo;

 	private Button moreInfo, signingInfo;

 	private String message;

 	private String helpContextId = IWorkbenchHelpContextIds.ABOUT_PLUGINS_DIALOG;

 	private String columnTitles[] = {
 			WorkbenchMessages.AboutPluginsDialog_signed,
 			WorkbenchMessages.AboutPluginsDialog_provider,
 			WorkbenchMessages.AboutPluginsDialog_pluginName,
 			WorkbenchMessages.AboutPluginsDialog_version,
 			WorkbenchMessages.AboutPluginsDialog_pluginId,

 	};
 	private Bundle[] bundles = WorkbenchPlugin.getDefault().getBundles();
 	private AboutBundleData[] bundleInfos;
 	private SashForm sashForm;
 	private BundleSigningInfo signingArea;

 	public void setBundles(Bundle[] bundles) {
 		this.bundles = bundles;
 	}

 	public void setHelpContextId(String id) {
 		this.helpContextId = id;
 	}

 	public void setMessage(String message) {
 		this.message = message;
 	}

 	/**
 	 */
 	protected void handleSigningInfoPressed() {
 		if (signingArea == null) {
 			signingArea = new BundleSigningInfo();
 			AboutBundleData bundleInfo = (AboutBundleData) ((IStructuredSelection) vendorInfo
 					.getSelection()).getFirstElement();
 			signingArea.setData(bundleInfo);

 			signingArea.createContents(sashForm);
 			sashForm.setWeights(new int[] { 100 - SIGNING_AREA_PERCENTAGE,
 					SIGNING_AREA_PERCENTAGE });
 			signingInfo
 					.setText(WorkbenchMessages.AboutPluginsDialog_signingInfo_hide);

 		} else {
 			// hide
 			signingInfo
 					.setText(WorkbenchMessages.AboutPluginsDialog_signingInfo_show);
 			signingArea.dispose();
 			signingArea = null;
 			sashForm.setWeights(new int[] { 100 });
 		}
 	}

 	public void createPageButtons(Composite parent) {

 		moreInfo = createButton(parent, MORE_ID,
 				WorkbenchMessages.AboutPluginsDialog_moreInfo);
 		moreInfo.setEnabled(false);

 		signingInfo = createButton(parent, SIGNING_ID,
 				WorkbenchMessages.AboutPluginsDialog_signingInfo_show);
 		signingInfo.setEnabled(false);

 		createButton(parent, COLUMNS_ID,
 				WorkbenchMessages.AboutPluginsDialog_columns);
 	}

 	public void createControl(Composite parent) {
 		initializeDialogUnits(parent);

 		// create a data object for each bundle, remove duplicates, and include
 		// only resolved bundles (bug 65548)
 		Map map = new HashMap();
 		for (int i = 0; i < bundles.length; ++i) {
 			AboutBundleData data = new AboutBundleData(bundles[i]);
 			if (BundleUtility.isReady(data.getState())
 					&& !map.containsKey(data.getVersionedId())) {
 				map.put(data.getVersionedId(), data);
 			}
 		}
 		bundleInfos = (AboutBundleData[]) map.values().toArray(
 				new AboutBundleData[0]);
 		WorkbenchPlugin.class.getSigners();

 		sashForm = new SashForm(parent, SWT.HORIZONTAL | SWT.SMOOTH);
 		FillLayout layout = new FillLayout();
 		sashForm.setLayout(layout);
 		layout.marginHeight = 0;
 		layout.marginWidth = 0;
 		GridData data = new GridData(GridData.FILL_BOTH);
 		sashForm.setLayoutData(data);

 		Composite outer = createOuterComposite(sashForm);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(outer, helpContextId);

 		if (message != null) {
 			Label label = new Label(outer, SWT.NONE);
 			label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 			label.setFont(parent.getFont());
 			label.setText(message);
 		}

 		createTable(outer);
 		setControl(outer);
 	}

 	/**
 	 * Create the table part of the dialog.
 	 *
 	 * @param parent
 	 *            the parent composite to contain the dialog area
 	 */
 	protected void createTable(Composite parent) {
 		vendorInfo = new TableViewer(parent, SWT.H_SCROLL | SWT.V_SCROLL
 				| SWT.SINGLE | SWT.FULL_SELECTION | SWT.BORDER);
 		vendorInfo.setUseHashlookup(true);
 		vendorInfo.getTable().setHeaderVisible(true);
 		vendorInfo.getTable().setLinesVisible(true);
 		vendorInfo.getTable().setFont(parent.getFont());
 		vendorInfo.addSelectionChangedListener(new ISelectionChangedListener() {

 			public void selectionChanged(SelectionChangedEvent event) {
 				checkEnablement();
 			}
 		});

 		final TableComparator comparator = new TableComparator();
 		vendorInfo.setComparator(comparator);
 		int[] columnWidths = {
 				convertHorizontalDLUsToPixels(30), // signature
 				convertHorizontalDLUsToPixels(120),
 				convertHorizontalDLUsToPixels(120),
 				convertHorizontalDLUsToPixels(70),
 				convertHorizontalDLUsToPixels(130), };

 		// create table headers
 		for (int i = 0; i < columnTitles.length; i++) {
 			TableColumn column = new TableColumn(vendorInfo.getTable(),
 					SWT.NULL);
 			if (i == PLUGIN_NAME_COLUMN_INDEX) { // prime initial sorting
 				updateTableSorting(i);
 			}
 			column.setWidth(columnWidths[i]);
 			column.setText(columnTitles[i]);
 			final int columnIndex = i;
 			column.addSelectionListener(new SelectionAdapter() {
 				public void widgetSelected(SelectionEvent e) {
 					updateTableSorting(columnIndex);
 				}
 			});
 		}

 		vendorInfo.setContentProvider(new ArrayContentProvider());
 		vendorInfo.setLabelProvider(new BundleTableLabelProvider());

 		GridData gridData = new GridData(GridData.FILL, GridData.FILL, true,
 				true);
 		gridData.heightHint = convertVerticalDLUsToPixels(TABLE_HEIGHT);
 		vendorInfo.getTable().setLayoutData(gridData);

 		vendorInfo.setInput(bundleInfos);
 	}

 	/**
 	 * Update the sort information on both the comparator and the table.
 	 *
 	 * @param columnIndex
 	 *            the index to sort by
 	 * @since 3.4
 	 */
 	private void updateTableSorting(final int columnIndex) {
 		TableComparator comparator = (TableComparator) vendorInfo
 				.getComparator();
 		// toggle direction if it's the same column
 		if (columnIndex == comparator.getSortColumn()) {
 			comparator.setAscending(!comparator.isAscending());
 		}
 		comparator.setSortColumn(columnIndex);
 		vendorInfo.getTable().setSortColumn(
 				vendorInfo.getTable().getColumn(columnIndex));
 		vendorInfo.getTable().setSortDirection(
 				comparator.isAscending() ? SWT.UP : SWT.DOWN);
 		vendorInfo.refresh(false);
 	}

 	/**
 	 * Return an url to the plugin's about.html file (what is shown when
 	 * "More info" is pressed) or null if no such file exists. The method does
 	 * nl lookup to allow for i18n.
 	 *
 	 * @param bundleInfo
 	 *            the bundle info
 	 * @param makeLocal
 	 *            whether to make the about content local
 	 * @return the url or <code>null</code>
 	 */
 	private URL getMoreInfoURL(AboutBundleData bundleInfo, boolean makeLocal) {
 		Bundle bundle = Platform.getBundle(bundleInfo.getId());
 		if (bundle == null) {
 			return null;
 		}

 		URL aboutUrl = Platform.find(bundle, baseNLPath.append(PLUGININFO),
 				null);
 		if (!makeLocal) {
 			return aboutUrl;
 		}
 		if (aboutUrl != null) {
 			try {
 				URL result = Platform.asLocalURL(aboutUrl);
 				try {
 					// Make local all content in the "about" directory.
 					// This is needed to handle jar'ed plug-ins.
 					// See Bug 88240 [About] About dialog needs to extract
 					// subdirs.
 					URL about = new URL(aboutUrl, "about_files"); //$NON-NLS-1$
 					if (about != null) {
 						Platform.asLocalURL(about);
 					}
 				} catch (IOException e) {
 					// skip the about dir if its not found or there are other
 					// problems.
 				}
 				return result;
 			} catch (IOException e) {
 				// do nothing
 			}
 		}
 		return null;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.ui.internal.about.ProductInfoPage#getId()
 	 */
 	String getId() {
 		return ID;
 	}

 	private void checkEnablement() {
 		// enable if there is an item selected and that
 		// item has additional info
 		IStructuredSelection selection = (IStructuredSelection) vendorInfo
 				.getSelection();
 		if (selection.getFirstElement() instanceof AboutBundleData) {
 			AboutBundleData selected = (AboutBundleData) selection
 					.getFirstElement();
 			moreInfo.setEnabled(selectionHasInfo(selected));
 			signingInfo.setEnabled(true);
 			if (signingArea != null) {
 				signingArea.setData(selected);
 			}
 		} else {
 			signingInfo.setEnabled(false);
 			moreInfo.setEnabled(false);
 		}
 	}

 	protected void buttonPressed(int buttonId) {
 		switch (buttonId) {
 		case MORE_ID:
 			handleMoreInfoPressed();
 			break;
 		case SIGNING_ID:
 			handleSigningInfoPressed();
 			break;
 		case COLUMNS_ID:
 			handleColumnsPressed();
 			break;
 		default:
 			super.buttonPressed(buttonId);
 			break;
 		}
 	}

 	/**
 	 * Check if the currently selected plugin has additional information to
 	 * show.
 	 *
 	 * @param bundleInfo
 	 *
 	 * @return true if the selected plugin has additional info available to
 	 *         display
 	 */
 	private boolean selectionHasInfo(AboutBundleData bundleInfo) {

 		URL infoURL = getMoreInfoURL(bundleInfo, false);

 		// only report ini problems if the -debug command line argument is used
 		if (infoURL == null && WorkbenchPlugin.DEBUG) {
 			WorkbenchPlugin.log("Problem reading plugin info for: " //$NON-NLS-1$
 					+ bundleInfo.getName());
 		}

 		return infoURL != null;
 	}

 	/**
 	 * The More Info button was pressed. Open a browser showing the license
 	 * information for the selected bundle or an error dialog if the browser
 	 * cannot be opened.
 	 */
 	protected void handleMoreInfoPressed() {
 		if (vendorInfo == null) {
 			return;
 		}

 		if (vendorInfo.getSelection().isEmpty())
 			return;

 		AboutBundleData bundleInfo = (AboutBundleData) ((IStructuredSelection) vendorInfo
 				.getSelection()).getFirstElement();

 		if (!AboutUtils.openBrowser(getShell(),
 				getMoreInfoURL(bundleInfo, true))) {
 			String message = NLS.bind(
 					WorkbenchMessages.AboutPluginsDialog_unableToOpenFile,
 					PLUGININFO, bundleInfo.getId());
 			StatusUtil.handleStatus(
 					WorkbenchMessages.AboutPluginsDialog_errorTitle
 							+ ": " + message, StatusManager.SHOW, getShell()); //$NON-NLS-1$
 		}
 	}

 	/**
 	 *
 	 */
 	private void handleColumnsPressed() {
 		ConfigureColumns.forTable(vendorInfo.getTable(), this);
 	}
 }

 class TableComparator extends ViewerComparator {

 	private int sortColumn = 0;
 	private int lastSortColumn = 0;
 	private boolean ascending = true;
 	private boolean lastAscending = true;

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see
 	 * org.eclipse.jface.viewers.ViewerComparator#compare(org.eclipse.jface.
 	 * viewers.Viewer, java.lang.Object, java.lang.Object)
 	 */
 	public int compare(Viewer viewer, Object e1, Object e2) {
 		if (sortColumn == 0 && e1 instanceof AboutBundleData
 				&& e2 instanceof AboutBundleData) {
 			AboutBundleData d1 = (AboutBundleData) e1;
 			AboutBundleData d2 = (AboutBundleData) e2;
 			int diff = getSignedSortValue(d1) - getSignedSortValue(d2);
 			// If values are different, or there is no secondary column defined,
 			// we are done
 			if (diff != 0 || lastSortColumn == 0)
 				return ascending ? diff : -diff;
 			// try a secondary sort
 			if (viewer instanceof TableViewer) {
 				TableViewer tableViewer = (TableViewer) viewer;
 				IBaseLabelProvider baseLabel = tableViewer.getLabelProvider();
 				if (baseLabel instanceof ITableLabelProvider) {
 					ITableLabelProvider tableProvider = (ITableLabelProvider) baseLabel;
 					String e1p = tableProvider
 							.getColumnText(e1, lastSortColumn);
 					String e2p = tableProvider
 							.getColumnText(e2, lastSortColumn);
 					int result = getComparator().compare(e1p, e2p);
 					return lastAscending ? result : (-1) * result;
 				}
 			}
 			// we couldn't determine a secondary sort, call it equal
 			return 0;
 		}
 		if (viewer instanceof TableViewer) {
 			TableViewer tableViewer = (TableViewer) viewer;
 			IBaseLabelProvider baseLabel = tableViewer.getLabelProvider();
 			if (baseLabel instanceof ITableLabelProvider) {
 				ITableLabelProvider tableProvider = (ITableLabelProvider) baseLabel;
 				String e1p = tableProvider.getColumnText(e1, sortColumn);
 				String e2p = tableProvider.getColumnText(e2, sortColumn);
 				int result = getComparator().compare(e1p, e2p);
 				// Secondary column sort
 				if (result == 0) {
 					if (lastSortColumn != 0) {
 						e1p = tableProvider.getColumnText(e1, lastSortColumn);
 						e2p = tableProvider.getColumnText(e2, lastSortColumn);
 						result = getComparator().compare(e1p, e2p);
 						return lastAscending ? result : (-1) * result;
 					} // secondary sort is by column 0
 					if (e1 instanceof AboutBundleData
 							&& e2 instanceof AboutBundleData) {
 						AboutBundleData d1 = (AboutBundleData) e1;
 						AboutBundleData d2 = (AboutBundleData) e2;
 						int diff = getSignedSortValue(d1)
 								- getSignedSortValue(d2);
 						return lastAscending ? diff : -diff;
 					}
 				}
 				// primary column sort
 				return ascending ? result : (-1) * result;
 			}
 		}

 		return super.compare(viewer, e1, e2);
 	}

 	/**
 	 * @param data
 	 * @return a sort value depending on the signed state
 	 */
 	private int getSignedSortValue(AboutBundleData data) {
 		if (!data.isSignedDetermined()) {
 			return 0;
 		} else if (data.isSigned()) {
 			return 1;
 		} else {
 			return -1;
 		}
 	}

 	/**
 	 * @return Returns the sortColumn.
 	 */
 	public int getSortColumn() {
 		return sortColumn;
 	}

 	/**
 	 * @param sortColumn
 	 *            The sortColumn to set.
 	 */
 	public void setSortColumn(int sortColumn) {
 		if (this.sortColumn != sortColumn) {
 			lastSortColumn = this.sortColumn;
 			lastAscending = this.ascending;
 			this.sortColumn = sortColumn;
 		}
 	}

 	/**
 	 * @return Returns the ascending.
 	 */
 	public boolean isAscending() {
 		return ascending;
 	}

 	/**
 	 * @param ascending
 	 *            The ascending to set.
 	 */
 	public void setAscending(boolean ascending) {
 		this.ascending = ascending;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2009 IBM Corporation 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:
	* IBM Corporation - initial API and implementation
	* Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog
	* font should be activated and used by other components.
	*******************************************************************************/
	package org.eclipse.ui.internal.about;

	import java.io.IOException;
	import java.net.URL;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.LinkedList;
	import java.util.List;
	import java.util.Map;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Path;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.core.runtime.jobs.Job;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.util.ConfigureColumns;
	import org.eclipse.jface.viewers.ArrayContentProvider;
	import org.eclipse.jface.viewers.IBaseLabelProvider;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.ITableLabelProvider;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.jface.viewers.LabelProviderChangedEvent;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.TableViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerComparator;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.SashForm;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.layout.FillLayout;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Table;
	import org.eclipse.swt.widgets.TableColumn;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.internal.IWorkbenchGraphicConstants;
	import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
	import org.eclipse.ui.internal.WorkbenchImages;
	import org.eclipse.ui.internal.WorkbenchMessages;
	import org.eclipse.ui.internal.WorkbenchPlugin;
	import org.eclipse.ui.internal.misc.StatusUtil;
	import org.eclipse.ui.internal.util.BundleUtility;
	import org.eclipse.ui.progress.WorkbenchJob;
	import org.eclipse.ui.statushandlers.StatusManager;
	import org.osgi.framework.Bundle;

	/**
	* Displays information about the product plugins.
	*
	* PRIVATE this class is internal to the ide
	*/
	public class AboutPluginsPage extends ProductInfoPage {

	public class BundleTableLabelProvider extends LabelProvider implements
	ITableLabelProvider {

	/**
	* Queue containing bundle signing info to be resolved.
	*/
	private LinkedList resolveQueue = new LinkedList();

	/**
	* Queue containing bundle data that's been resolve and needs updating.
	*/
	private List updateQueue = new ArrayList();

	/*
	* this job will attempt to discover the signing state of a given bundle
	* and then send it along to the update job
	*/
	private Job resolveJob = new Job(AboutPluginsPage.class.getName()) {
	{
	setSystem(true);
	setPriority(Job.SHORT);
	}

	protected IStatus run(IProgressMonitor monitor) {
	while (true) {
	// If the UI has not been created, nothing to do.
	if (vendorInfo == null)
	return Status.OK_STATUS;
	// If the UI has been disposed since we were asked to
	// render, nothing to do.
	Table table = vendorInfo.getTable();
	// the table has been disposed since we were asked to render
	if (table == null \|\| table.isDisposed())
	return Status.OK_STATUS;
	AboutBundleData data = null;
	synchronized (resolveQueue) {
	if (resolveQueue.isEmpty())
	return Status.OK_STATUS;
	data = (AboutBundleData) resolveQueue.removeFirst();
	}
	try {
	// following is an expensive call
	data.isSigned();

	synchronized (updateQueue) {
	updateQueue.add(data);
	}
	// start the update job
	updateJob.schedule();
	} catch (IllegalStateException e) {
	// the bundle we're testing has been unloaded. Do
	// nothing.
	}
	}
	}
	};

	/*
	* this job is responsible for feeding label change events into the
	* viewer as they become available from the resolve job
	*/
	private Job updateJob = new WorkbenchJob(PlatformUI.getWorkbench()
	.getDisplay(), AboutPluginsPage.class.getName()) {
	{
	setSystem(true);
	setPriority(Job.DECORATE);
	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.ui.progress.UIJob#runInUIThread(org.eclipse.core.
	* runtime.IProgressMonitor)
	*/
	public IStatus runInUIThread(IProgressMonitor monitor) {
	while (true) {
	Control page = getControl();
	// the page has gone down since we were asked to render
	if (page == null \|\| page.isDisposed())
	return Status.OK_STATUS;
	AboutBundleData[] data = null;
	synchronized (updateQueue) {
	if (updateQueue.isEmpty())
	return Status.OK_STATUS;

	data = (AboutBundleData[]) updateQueue
	.toArray(new AboutBundleData[updateQueue.size()]);
	updateQueue.clear();

	}
	fireLabelProviderChanged(new LabelProviderChangedEvent(
	BundleTableLabelProvider.this, data));
	}
	}
	};

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.jface.viewers.ITableLabelProvider#getColumnImage(java
	* .lang.Object, int)
	*/
	public Image getColumnImage(Object element, int columnIndex) {
	if (columnIndex == 0) {
	if (element instanceof AboutBundleData) {
	final AboutBundleData data = (AboutBundleData) element;
	if (data.isSignedDetermined()) {
	return WorkbenchImages
	.getImage(data.isSigned() ? IWorkbenchGraphicConstants.IMG_OBJ_SIGNED_YES
	: IWorkbenchGraphicConstants.IMG_OBJ_SIGNED_NO);
	}

	synchronized (resolveQueue) {
	resolveQueue.add(data);
	}
	resolveJob.schedule();

	return WorkbenchImages
	.getImage(IWorkbenchGraphicConstants.IMG_OBJ_SIGNED_UNKNOWN);
	}
	}
	return null;
	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.jface.viewers.ITableLabelProvider#getColumnText(java.
	* lang.Object, int)
	*/
	public String getColumnText(Object element, int columnIndex) {
	if (element instanceof AboutBundleData) {
	AboutBundleData data = (AboutBundleData) element;
	switch (columnIndex) {
	case 1:
	return data.getProviderName();
	case 2:
	return data.getName();
	case 3:
	return data.getVersion();
	case 4:
	return data.getId();
	}
	}
	return ""; //$NON-NLS-1$
	}
	}

	// This id is used when the page is created inside its own dialog
	private static final String ID = "productInfo.plugins"; //$NON-NLS-1$

	/**
	* Table height in dialog units (value 200).
	*/
	private static final int TABLE_HEIGHT = 200;

	private final static int MORE_ID = IDialogConstants.CLIENT_ID + 1;
	private final static int SIGNING_ID = MORE_ID + 1;
	private final static int COLUMNS_ID = MORE_ID + 2;

	private static final IPath baseNLPath = new Path("$nl$"); //$NON-NLS-1$

	private static final String PLUGININFO = "about.html"; //$NON-NLS-1$

	private static final int PLUGIN_NAME_COLUMN_INDEX = 2;

	private static final int SIGNING_AREA_PERCENTAGE = 30;

	private TableViewer vendorInfo;

	private Button moreInfo, signingInfo;

	private String message;

	private String helpContextId = IWorkbenchHelpContextIds.ABOUT_PLUGINS_DIALOG;

	private String columnTitles[] = {
	WorkbenchMessages.AboutPluginsDialog_signed,
	WorkbenchMessages.AboutPluginsDialog_provider,
	WorkbenchMessages.AboutPluginsDialog_pluginName,
	WorkbenchMessages.AboutPluginsDialog_version,
	WorkbenchMessages.AboutPluginsDialog_pluginId,

	};
	private Bundle[] bundles = WorkbenchPlugin.getDefault().getBundles();
	private AboutBundleData[] bundleInfos;
	private SashForm sashForm;
	private BundleSigningInfo signingArea;

	public void setBundles(Bundle[] bundles) {
	this.bundles = bundles;
	}

	public void setHelpContextId(String id) {
	this.helpContextId = id;
	}

	public void setMessage(String message) {
	this.message = message;
	}

	/**
	*/
	protected void handleSigningInfoPressed() {
	if (signingArea == null) {
	signingArea = new BundleSigningInfo();
	AboutBundleData bundleInfo = (AboutBundleData) ((IStructuredSelection) vendorInfo
	.getSelection()).getFirstElement();
	signingArea.setData(bundleInfo);

	signingArea.createContents(sashForm);
	sashForm.setWeights(new int[] { 100 - SIGNING_AREA_PERCENTAGE,
	SIGNING_AREA_PERCENTAGE });
	signingInfo
	.setText(WorkbenchMessages.AboutPluginsDialog_signingInfo_hide);

	} else {
	// hide
	signingInfo
	.setText(WorkbenchMessages.AboutPluginsDialog_signingInfo_show);
	signingArea.dispose();
	signingArea = null;
	sashForm.setWeights(new int[] { 100 });
	}
	}

	public void createPageButtons(Composite parent) {

	moreInfo = createButton(parent, MORE_ID,
	WorkbenchMessages.AboutPluginsDialog_moreInfo);
	moreInfo.setEnabled(false);

	signingInfo = createButton(parent, SIGNING_ID,
	WorkbenchMessages.AboutPluginsDialog_signingInfo_show);
	signingInfo.setEnabled(false);

	createButton(parent, COLUMNS_ID,
	WorkbenchMessages.AboutPluginsDialog_columns);
	}

	public void createControl(Composite parent) {
	initializeDialogUnits(parent);

	// create a data object for each bundle, remove duplicates, and include
	// only resolved bundles (bug 65548)
	Map map = new HashMap();
	for (int i = 0; i < bundles.length; ++i) {
	AboutBundleData data = new AboutBundleData(bundles[i]);
	if (BundleUtility.isReady(data.getState())
	&& !map.containsKey(data.getVersionedId())) {
	map.put(data.getVersionedId(), data);
	}
	}
	bundleInfos = (AboutBundleData[]) map.values().toArray(
	new AboutBundleData[0]);
	WorkbenchPlugin.class.getSigners();

	sashForm = new SashForm(parent, SWT.HORIZONTAL \| SWT.SMOOTH);
	FillLayout layout = new FillLayout();
	sashForm.setLayout(layout);
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	GridData data = new GridData(GridData.FILL_BOTH);
	sashForm.setLayoutData(data);

	Composite outer = createOuterComposite(sashForm);
	PlatformUI.getWorkbench().getHelpSystem().setHelp(outer, helpContextId);

	if (message != null) {
	Label label = new Label(outer, SWT.NONE);
	label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	label.setFont(parent.getFont());
	label.setText(message);
	}

	createTable(outer);
	setControl(outer);
	}

	/**
	* Create the table part of the dialog.
	*
	* @param parent
	* the parent composite to contain the dialog area
	*/
	protected void createTable(Composite parent) {
	vendorInfo = new TableViewer(parent, SWT.H_SCROLL \| SWT.V_SCROLL
	\| SWT.SINGLE \| SWT.FULL_SELECTION \| SWT.BORDER);
	vendorInfo.setUseHashlookup(true);
	vendorInfo.getTable().setHeaderVisible(true);
	vendorInfo.getTable().setLinesVisible(true);
	vendorInfo.getTable().setFont(parent.getFont());
	vendorInfo.addSelectionChangedListener(new ISelectionChangedListener() {

	public void selectionChanged(SelectionChangedEvent event) {
	checkEnablement();
	}
	});

	final TableComparator comparator = new TableComparator();
	vendorInfo.setComparator(comparator);
	int[] columnWidths = {
	convertHorizontalDLUsToPixels(30), // signature
	convertHorizontalDLUsToPixels(120),
	convertHorizontalDLUsToPixels(120),
	convertHorizontalDLUsToPixels(70),
	convertHorizontalDLUsToPixels(130), };

	// create table headers
	for (int i = 0; i < columnTitles.length; i++) {
	TableColumn column = new TableColumn(vendorInfo.getTable(),
	SWT.NULL);
	if (i == PLUGIN_NAME_COLUMN_INDEX) { // prime initial sorting
	updateTableSorting(i);
	}
	column.setWidth(columnWidths[i]);
	column.setText(columnTitles[i]);
	final int columnIndex = i;
	column.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	updateTableSorting(columnIndex);
	}
	});
	}

	vendorInfo.setContentProvider(new ArrayContentProvider());
	vendorInfo.setLabelProvider(new BundleTableLabelProvider());

	GridData gridData = new GridData(GridData.FILL, GridData.FILL, true,
	true);
	gridData.heightHint = convertVerticalDLUsToPixels(TABLE_HEIGHT);
	vendorInfo.getTable().setLayoutData(gridData);

	vendorInfo.setInput(bundleInfos);
	}

	/**
	* Update the sort information on both the comparator and the table.
	*
	* @param columnIndex
	* the index to sort by
	* @since 3.4
	*/
	private void updateTableSorting(final int columnIndex) {
	TableComparator comparator = (TableComparator) vendorInfo
	.getComparator();
	// toggle direction if it's the same column
	if (columnIndex == comparator.getSortColumn()) {
	comparator.setAscending(!comparator.isAscending());
	}
	comparator.setSortColumn(columnIndex);
	vendorInfo.getTable().setSortColumn(
	vendorInfo.getTable().getColumn(columnIndex));
	vendorInfo.getTable().setSortDirection(
	comparator.isAscending() ? SWT.UP : SWT.DOWN);
	vendorInfo.refresh(false);
	}

	/**
	* Return an url to the plugin's about.html file (what is shown when
	* "More info" is pressed) or null if no such file exists. The method does
	* nl lookup to allow for i18n.
	*
	* @param bundleInfo
	* the bundle info
	* @param makeLocal
	* whether to make the about content local
	* @return the url or <code>null</code>
	*/
	private URL getMoreInfoURL(AboutBundleData bundleInfo, boolean makeLocal) {
	Bundle bundle = Platform.getBundle(bundleInfo.getId());
	if (bundle == null) {
	return null;
	}

	URL aboutUrl = Platform.find(bundle, baseNLPath.append(PLUGININFO),
	null);
	if (!makeLocal) {
	return aboutUrl;
	}
	if (aboutUrl != null) {
	try {
	URL result = Platform.asLocalURL(aboutUrl);
	try {
	// Make local all content in the "about" directory.
	// This is needed to handle jar'ed plug-ins.
	// See Bug 88240 [About] About dialog needs to extract
	// subdirs.
	URL about = new URL(aboutUrl, "about_files"); //$NON-NLS-1$
	if (about != null) {
	Platform.asLocalURL(about);
	}
	} catch (IOException e) {
	// skip the about dir if its not found or there are other
	// problems.
	}
	return result;
	} catch (IOException e) {
	// do nothing
	}
	}
	return null;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.ui.internal.about.ProductInfoPage#getId()
	*/
	String getId() {
	return ID;
	}

	private void checkEnablement() {
	// enable if there is an item selected and that
	// item has additional info
	IStructuredSelection selection = (IStructuredSelection) vendorInfo
	.getSelection();
	if (selection.getFirstElement() instanceof AboutBundleData) {
	AboutBundleData selected = (AboutBundleData) selection
	.getFirstElement();
	moreInfo.setEnabled(selectionHasInfo(selected));
	signingInfo.setEnabled(true);
	if (signingArea != null) {
	signingArea.setData(selected);
	}
	} else {
	signingInfo.setEnabled(false);
	moreInfo.setEnabled(false);
	}
	}

	protected void buttonPressed(int buttonId) {
	switch (buttonId) {
	case MORE_ID:
	handleMoreInfoPressed();
	break;
	case SIGNING_ID:
	handleSigningInfoPressed();
	break;
	case COLUMNS_ID:
	handleColumnsPressed();
	break;
	default:
	super.buttonPressed(buttonId);
	break;
	}
	}

	/**
	* Check if the currently selected plugin has additional information to
	* show.
	*
	* @param bundleInfo
	*
	* @return true if the selected plugin has additional info available to
	* display
	*/
	private boolean selectionHasInfo(AboutBundleData bundleInfo) {

	URL infoURL = getMoreInfoURL(bundleInfo, false);

	// only report ini problems if the -debug command line argument is used
	if (infoURL == null && WorkbenchPlugin.DEBUG) {
	WorkbenchPlugin.log("Problem reading plugin info for: " //$NON-NLS-1$
	+ bundleInfo.getName());
	}

	return infoURL != null;
	}

	/**
	* The More Info button was pressed. Open a browser showing the license
	* information for the selected bundle or an error dialog if the browser
	* cannot be opened.
	*/
	protected void handleMoreInfoPressed() {
	if (vendorInfo == null) {
	return;
	}

	if (vendorInfo.getSelection().isEmpty())
	return;

	AboutBundleData bundleInfo = (AboutBundleData) ((IStructuredSelection) vendorInfo
	.getSelection()).getFirstElement();

	if (!AboutUtils.openBrowser(getShell(),
	getMoreInfoURL(bundleInfo, true))) {
	String message = NLS.bind(
	WorkbenchMessages.AboutPluginsDialog_unableToOpenFile,
	PLUGININFO, bundleInfo.getId());
	StatusUtil.handleStatus(
	WorkbenchMessages.AboutPluginsDialog_errorTitle
	+ ": " + message, StatusManager.SHOW, getShell()); //$NON-NLS-1$
	}
	}

	/**
	*
	*/
	private void handleColumnsPressed() {
	ConfigureColumns.forTable(vendorInfo.getTable(), this);
	}
	}

	class TableComparator extends ViewerComparator {

	private int sortColumn = 0;
	private int lastSortColumn = 0;
	private boolean ascending = true;
	private boolean lastAscending = true;

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.jface.viewers.ViewerComparator#compare(org.eclipse.jface.
	* viewers.Viewer, java.lang.Object, java.lang.Object)
	*/
	public int compare(Viewer viewer, Object e1, Object e2) {
	if (sortColumn == 0 && e1 instanceof AboutBundleData
	&& e2 instanceof AboutBundleData) {
	AboutBundleData d1 = (AboutBundleData) e1;
	AboutBundleData d2 = (AboutBundleData) e2;
	int diff = getSignedSortValue(d1) - getSignedSortValue(d2);
	// If values are different, or there is no secondary column defined,
	// we are done
	if (diff != 0 \|\| lastSortColumn == 0)
	return ascending ? diff : -diff;
	// try a secondary sort
	if (viewer instanceof TableViewer) {
	TableViewer tableViewer = (TableViewer) viewer;
	IBaseLabelProvider baseLabel = tableViewer.getLabelProvider();
	if (baseLabel instanceof ITableLabelProvider) {
	ITableLabelProvider tableProvider = (ITableLabelProvider) baseLabel;
	String e1p = tableProvider
	.getColumnText(e1, lastSortColumn);
	String e2p = tableProvider
	.getColumnText(e2, lastSortColumn);
	int result = getComparator().compare(e1p, e2p);
	return lastAscending ? result : (-1) * result;
	}
	}
	// we couldn't determine a secondary sort, call it equal
	return 0;
	}
	if (viewer instanceof TableViewer) {
	TableViewer tableViewer = (TableViewer) viewer;
	IBaseLabelProvider baseLabel = tableViewer.getLabelProvider();
	if (baseLabel instanceof ITableLabelProvider) {
	ITableLabelProvider tableProvider = (ITableLabelProvider) baseLabel;
	String e1p = tableProvider.getColumnText(e1, sortColumn);
	String e2p = tableProvider.getColumnText(e2, sortColumn);
	int result = getComparator().compare(e1p, e2p);
	// Secondary column sort
	if (result == 0) {
	if (lastSortColumn != 0) {
	e1p = tableProvider.getColumnText(e1, lastSortColumn);
	e2p = tableProvider.getColumnText(e2, lastSortColumn);
	result = getComparator().compare(e1p, e2p);
	return lastAscending ? result : (-1) * result;
	} // secondary sort is by column 0
	if (e1 instanceof AboutBundleData
	&& e2 instanceof AboutBundleData) {
	AboutBundleData d1 = (AboutBundleData) e1;
	AboutBundleData d2 = (AboutBundleData) e2;
	int diff = getSignedSortValue(d1)
	- getSignedSortValue(d2);
	return lastAscending ? diff : -diff;
	}
	}
	// primary column sort
	return ascending ? result : (-1) * result;
	}
	}

	return super.compare(viewer, e1, e2);
	}

	/**
	* @param data
	* @return a sort value depending on the signed state
	*/
	private int getSignedSortValue(AboutBundleData data) {
	if (!data.isSignedDetermined()) {
	return 0;
	} else if (data.isSigned()) {
	return 1;
	} else {
	return -1;
	}
	}

	/**
	* @return Returns the sortColumn.
	*/
	public int getSortColumn() {
	return sortColumn;
	}

	/**
	* @param sortColumn
	* The sortColumn to set.
	*/
	public void setSortColumn(int sortColumn) {
	if (this.sortColumn != sortColumn) {
	lastSortColumn = this.sortColumn;
	lastAscending = this.ascending;
	this.sortColumn = sortColumn;
	}
	}

	/**
	* @return Returns the ascending.
	*/
	public boolean isAscending() {
	return ascending;
	}

	/**
	* @param ascending
	* The ascending to set.
	*/
	public void setAscending(boolean ascending) {
	this.ascending = ascending;
	}
	}