bundles/org.eclipse.equinox.p2.ui.importexport/src/org/eclipse/equinox/internal/p2/importexport/internal/wizard/AbstractPage.java - equinox/rt.equinox.p2 - Git at Google

 /*******************************************************************************
  * Copyright (c) 2011 WindRiver 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:
  *     WindRiver Corporation - initial API and implementation
  *     IBM Corporation - Ongoing development
  *******************************************************************************/
 package org.eclipse.equinox.internal.p2.importexport.internal.wizard;

 import java.io.File;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.equinox.internal.p2.importexport.P2ImportExport;
 import org.eclipse.equinox.internal.p2.importexport.internal.Constants;
 import org.eclipse.equinox.internal.p2.importexport.internal.Messages;
 import org.eclipse.equinox.internal.p2.ui.ProvUI;
 import org.eclipse.equinox.internal.p2.ui.ProvUIMessages;
 import org.eclipse.equinox.internal.p2.ui.dialogs.ILayoutConstants;
 import org.eclipse.equinox.internal.p2.ui.viewers.*;
 import org.eclipse.equinox.p2.core.IProvisioningAgent;
 import org.eclipse.equinox.p2.engine.IProfile;
 import org.eclipse.equinox.p2.engine.IProfileRegistry;
 import org.eclipse.equinox.p2.metadata.IInstallableUnit;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.viewers.*;
 import org.eclipse.jface.wizard.WizardPage;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.*;
 import org.eclipse.swt.widgets.*;
 import org.osgi.framework.BundleContext;
 import org.osgi.util.tracker.ServiceTracker;

 public abstract class AbstractPage extends WizardPage implements Listener {

 	protected String currentMessage;
 	protected Button destinationBrowseButton;
 	protected Combo destinationNameField;
 	protected P2ImportExport importexportService = null;
 	protected CheckboxTableViewer viewer = null;
 	protected Exception finishException;
 	protected static IProfileRegistry profileRegistry = null;
 	protected static IProvisioningAgent agent = null;

 	class TableViewerComparator extends ViewerComparator {
 		private int sortColumn = 0;
 		private int lastSortColumn = 0;
 		private boolean ascending = false;
 		private boolean lastAscending = false;

 		@Override
 		public int compare(Viewer viewer, Object e1, Object e2) {
 			IInstallableUnit iu1 = ProvUI.getAdapter(e1, IInstallableUnit.class);
 			IInstallableUnit iu2 = ProvUI.getAdapter(e2, IInstallableUnit.class);
 			if (iu1 != null && iu2 != null) {
 				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, getSortColumn());
 						String e2p = tableProvider.getColumnText(e2, getSortColumn());
 						@SuppressWarnings("unchecked")
 						int result = getComparator().compare(e1p, e2p);
 						// Secondary column sort
 						if (result == 0) {
 							e1p = tableProvider.getColumnText(e1, lastSortColumn);
 							e2p = tableProvider.getColumnText(e2, lastSortColumn);
 							@SuppressWarnings("unchecked")
 							int result2 = getComparator().compare(e1p, e2p);
 							return lastAscending ? result2 : (-1) * result2;
 						}
 						return isAscending() ? result : (-1) * result;
 					}
 				}
 				// we couldn't determine a secondary sort, call it equal
 				return 0;
 			}
 			return super.compare(viewer, e1, e2);
 		}

 		/**
 		 * @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;
 		}
 	}

 	static {
 		BundleContext context = Platform.getBundle(Constants.Bundle_ID).getBundleContext();
 		ServiceTracker<IProvisioningAgent, IProvisioningAgent> tracker = new ServiceTracker<IProvisioningAgent, IProvisioningAgent>(context, IProvisioningAgent.class, null);
 		tracker.open();
 		agent = tracker.getService();
 		tracker.close();
 		if (agent != null)
 			profileRegistry = (IProfileRegistry) agent.getService(IProfileRegistry.SERVICE_NAME);
 	}

 	public AbstractPage(String pageName) {
 		super(pageName);
 	}

 	public AbstractPage(String pageName, String title, ImageDescriptor titleImage) {
 		super(pageName, title, titleImage);
 	}

 	protected IProfile getSelfProfile() {
 		if (profileRegistry != null) {
 			String selfID = System.getProperty("eclipse.p2.profile"); //$NON-NLS-1$
 			if (selfID == null)
 				selfID = IProfileRegistry.SELF;
 			return profileRegistry.getProfile(selfID);
 		}
 		return null;
 	}

 	private void createColumns(TableViewer viewer) {
 		String[] titles = {Messages.Column_Name, Messages.Column_Version, Messages.Column_Id};
 		for (int i = 0; i < titles.length; i++) {
 			TableViewerColumn column = new TableViewerColumn(viewer, SWT.NONE);
 			column.getColumn().setText(titles[i]);
 			column.getColumn().setResizable(true);
 			column.getColumn().setMoveable(true);
 			if (Messages.Column_Name.equals(titles[i]))
 				updateTableSorting(i);
 			final int columnIndex = i;
 			column.getColumn().addSelectionListener(new SelectionAdapter() {
 				@Override
 				public void widgetSelected(SelectionEvent e) {
 					updateTableSorting(columnIndex);
 				}
 			});
 		}
 	}

 	protected void updateTableSorting(int columnIndex) {
 		TableViewerComparator comparator = (TableViewerComparator) viewer.getComparator();
 		// toggle direction if it's the same column
 		if (columnIndex == comparator.getSortColumn()) {
 			comparator.setAscending(!comparator.isAscending());
 		}
 		comparator.setSortColumn(columnIndex);
 		viewer.getTable().setSortColumn(viewer.getTable().getColumn(columnIndex));
 		viewer.getTable().setSortDirection(comparator.isAscending() ? SWT.UP : SWT.DOWN);
 		viewer.refresh(false);
 	}

 	protected abstract void createContents(Composite composite);

 	public void createControl(Composite parent) {
 		initializeDialogUnits(parent);
 		initializeService();
 		Composite composite = new Composite(parent, SWT.NULL);
 		GridLayout layout = new GridLayout(1, true);
 		layout.horizontalSpacing = 0;
 		layout.verticalSpacing = 5;
 		composite.setLayout(layout);
 		composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL | GridData.HORIZONTAL_ALIGN_FILL));

 		createContents(composite);

 		// can not finish initially, but don't want to start with an error
 		// message either
 		if (!(validDestination() && validateOptionsGroup())) {
 			setPageComplete(false);
 		}

 		setControl(composite);
 		giveFocusToDestination();
 		Dialog.applyDialogFont(composite);
 	}

 	protected void createDestinationGroup(Composite parent) {
 		Composite composite = new Composite(parent, SWT.BORDER);
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 3;
 		composite.setLayout(layout);
 		composite.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, false));

 		Label label = new Label(composite, SWT.NONE);
 		label.setText(getDestinationLabel());

 		destinationNameField = new Combo(composite, SWT.SINGLE | SWT.BORDER);
 		GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL);
 		destinationNameField.setLayoutData(data);
 		destinationNameField.addListener(SWT.Modify, this);
 		destinationNameField.addListener(SWT.Selection, this);
 		destinationNameField.addListener(SWT.FocusIn, new Listener() {

 			public void handleEvent(Event event) {
 				destinationNameField.clearSelection();
 			}
 		});
 		destinationBrowseButton = new Button(composite, SWT.PUSH);
 		destinationBrowseButton.setText(Messages.Page_BUTTON_BROWSER);
 		destinationBrowseButton.addListener(SWT.Selection, this);
 		destinationBrowseButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
 	}

 	protected IUColumnConfig[] getColumnConfig() {
 		return new IUColumnConfig[] {new IUColumnConfig(ProvUIMessages.ProvUI_NameColumnTitle, IUColumnConfig.COLUMN_NAME, ILayoutConstants.DEFAULT_PRIMARY_COLUMN_WIDTH), new IUColumnConfig(ProvUIMessages.ProvUI_VersionColumnTitle, IUColumnConfig.COLUMN_VERSION, ILayoutConstants.DEFAULT_SMALL_COLUMN_WIDTH), new IUColumnConfig(ProvUIMessages.ProvUI_IdColumnTitle, IUColumnConfig.COLUMN_ID, ILayoutConstants.DEFAULT_COLUMN_WIDTH)};
 	}

 	protected void createInstallationTable(final Composite parent) {
 		Group group = new Group(parent, SWT.NONE);
 		GridData griddata = new GridData(GridData.FILL, GridData.FILL, true, true);
 		griddata.verticalSpan = griddata.horizontalSpan = 0;
 		group.setLayoutData(griddata);
 		group.setLayout(new GridLayout(1, false));
 		viewer = CheckboxTableViewer.newCheckList(group, SWT.MULTI | SWT.BORDER);
 		final Table table = viewer.getTable();
 		table.setHeaderVisible(true);
 		table.setLinesVisible(false);
 		viewer.setComparator(new TableViewerComparator());
 		createColumns(viewer);
 		viewer.setContentProvider(getContentProvider());
 		viewer.setLabelProvider(getLabelProvider());
 		parent.addControlListener(new ControlAdapter() {
 			private final int[] columnRate = new int[] {6, 2, 2};

 			@Override
 			public void controlResized(ControlEvent e) {
 				Rectangle area = parent.getClientArea();
 				Point size = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 				ScrollBar vBar = table.getVerticalBar();
 				int width = area.width - table.computeTrim(0, 0, 0, 0).width - vBar.getSize().x;
 				if (size.y > area.height + table.getHeaderHeight()) {
 					// Subtract the scrollbar width from the total column width
 					// if a vertical scrollbar will be required
 					Point vBarSize = vBar.getSize();
 					width -= vBarSize.x;
 				}
 				Point oldSize = table.getSize();
 				TableColumn[] columns = table.getColumns();
 				int hasUsed = 0, i = 0;
 				if (oldSize.x > area.width) {
 					// table is getting smaller so make the columns
 					// smaller first and then resize the table to
 					// match the client area width
 					for (; i < columns.length - 1; i++) {
 						columns[i].setWidth(width * columnRate[i] / 10);
 						hasUsed += columns[i].getWidth();
 					}
 					columns[columns.length - 1].setWidth(width - hasUsed);
 					table.setSize(area.width, area.height);
 				} else {
 					// table is getting bigger so make the table
 					// bigger first and then make the columns wider
 					// to match the client area width
 					table.setSize(area.width, area.height);
 					for (; i < columns.length - 1; i++) {
 						columns[i].setWidth(width * columnRate[i] / 10);
 						hasUsed += columns[i].getWidth();
 					}
 					columns[columns.length - 1].setWidth(width - hasUsed);
 				}
 			}
 		});
 		ICheckStateProvider provider = getViewerDefaultState();
 		if (provider != null)
 			viewer.setCheckStateProvider(provider);
 		else
 			viewer.addSelectionChangedListener(new ISelectionChangedListener() {
 				public void selectionChanged(SelectionChangedEvent event) {
 					updatePageCompletion();
 				}
 			});
 		viewer.getControl().setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true));
 		viewer.getControl().setSize(300, 200);
 		viewer.setInput(getInput());
 		Composite buttons = new Composite(group, SWT.NONE);
 		buttons.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, false));
 		buttons.setLayout(new RowLayout(SWT.HORIZONTAL));
 		Button selectAll = new Button(buttons, SWT.PUSH);
 		selectAll.setText(Messages.AbstractPage_ButtonSelectAll);
 		selectAll.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				for (TableItem item : viewer.getTable().getItems()) {
 					if (!item.getChecked()) {
 						item.setChecked(true);
 						Event event = new Event();
 						event.widget = item.getParent();
 						event.detail = SWT.CHECK;
 						event.item = item;
 						event.type = SWT.Selection;
 						viewer.getTable().notifyListeners(SWT.Selection, event);
 					}
 				}
 				updatePageCompletion();
 			}
 		});
 		Button deselectAll = new Button(buttons, SWT.PUSH);
 		deselectAll.setText(Messages.AbstractPage_ButtonDeselectAll);
 		deselectAll.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				viewer.setAllChecked(false);
 				updatePageCompletion();
 			}
 		});
 	}

 	protected ICheckStateProvider getViewerDefaultState() {
 		return null;
 	}

 	protected ITableLabelProvider getLabelProvider() {
 		return new IUDetailsLabelProvider(null, getColumnConfig(), null);
 	}

 	protected IContentProvider getContentProvider() {
 		return new DeferredQueryContentProvider();
 	}

 	protected boolean determinePageCompletion() {
 		currentMessage = null;
 		// validate groups in order of priority so error message is the most important one
 		boolean complete = validateDestinationGroup() && validateOptionsGroup();

 		// Avoid draw flicker by not clearing the error
 		// message unless all is valid.
 		if (complete) {
 			setErrorMessage(null);
 		} else {
 			setErrorMessage(currentMessage);
 		}

 		return complete;
 	}

 	protected abstract void doFinish() throws Exception;

 	protected int getBrowseDialogStyle() {
 		return SWT.OPEN;
 	}

 	/**
 	 * returns the destination label
 	 * @return non null string
 	 */
 	protected abstract String getDestinationLabel();

 	/**
 	 * Answer the contents of self's destination specification widget
 	 *
 	 * @return java.lang.String
 	 */
 	protected String getDestinationValue() {
 		return destinationNameField.getText().trim();
 	}

 	/**
 	 * return the title of dialog
 	 * @return non null string
 	 */
 	protected abstract String getDialogTitle();

 	protected abstract Object getInput();

 	protected abstract String getInvalidDestinationMessage();

 	protected String getNoOptionsMessage() {
 		return Messages.PAGE_NOINSTALLTION_ERROR;
 	}

 	protected abstract void giveFocusToDestination();

 	/**
 	 * Open an appropriate destination browser so that the user can specify a
 	 * source to import from
 	 */
 	protected void handleDestinationBrowseButtonPressed() {
 		FileDialog dialog = new FileDialog(getContainer().getShell(), getBrowseDialogStyle() | SWT.SHEET);
 		dialog.setText(getDialogTitle());
 		dialog.setFilterPath(getDestinationValue());
 		dialog.setFilterExtensions(new String[] {Messages.EXTENSION_p2F, Messages.EXTENSION_ALL});
 		dialog.setFilterNames(new String[] {Messages.EXTENSION_p2F_NAME, Messages.EXTENSION_ALL_NAME});
 		String selectedFileName = dialog.open();

 		if (selectedFileName != null) {
 			if (!selectedFileName.endsWith(Messages.EXTENSION_p2F.substring(1)))
 				selectedFileName += Messages.EXTENSION_p2F.substring(1);
 			setDestinationValue(selectedFileName);
 		}
 	}

 	public void handleEvent(Event event) {
 		Widget source = event.widget;

 		if (source == destinationBrowseButton) {
 			handleDestinationBrowseButtonPressed();
 		} else
 			handleDestinationChanged(getDestinationValue());
 		updatePageCompletion();
 	}

 	protected void handleDestinationChanged(String newDestination) {
 		// do nothing
 	}

 	protected void initializeService() {
 		ServiceTracker<P2ImportExport, P2ImportExport> tracker = new ServiceTracker<P2ImportExport, P2ImportExport>(Platform.getBundle(Constants.Bundle_ID).getBundleContext(), P2ImportExport.class.getName(), null);
 		tracker.open();
 		importexportService = tracker.getService();
 		tracker.close();
 	}

 	protected void setDestinationValue(String selectedFileName) {
 		destinationNameField.setText(selectedFileName);
 	}

 	/**
 	 * Determine if the page is complete and update the page appropriately.
 	 */
 	protected void updatePageCompletion() {
 		boolean pageComplete = determinePageCompletion();
 		setPageComplete(pageComplete);
 		if (pageComplete) {
 			setMessage(null);
 		}
 	}

 	/**
 	 * Validate the destination group.
 	 * @return <code>true</code> if the group is valid. If
 	 * not set the error message and return <code>false</code>.
 	 */
 	protected boolean validateDestinationGroup() {
 		if (!validDestination()) {
 			currentMessage = getInvalidDestinationMessage();
 			return false;
 		}

 		return true;
 	}

 	protected boolean validateOptionsGroup() {
 		if (viewer == null || viewer.getCheckedElements().length > 0)
 			return true;

 		currentMessage = getNoOptionsMessage();
 		return false;
 	}

 	protected boolean validDestination() {
 		if (this.destinationNameField == null)
 			return true;
 		File file = new File(getDestinationValue());
 		return !(file.getPath().length() <= 0 || file.isDirectory());
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2011 WindRiver 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:
	* WindRiver Corporation - initial API and implementation
	* IBM Corporation - Ongoing development
	*******************************************************************************/
	package org.eclipse.equinox.internal.p2.importexport.internal.wizard;

	import java.io.File;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.equinox.internal.p2.importexport.P2ImportExport;
	import org.eclipse.equinox.internal.p2.importexport.internal.Constants;
	import org.eclipse.equinox.internal.p2.importexport.internal.Messages;
	import org.eclipse.equinox.internal.p2.ui.ProvUI;
	import org.eclipse.equinox.internal.p2.ui.ProvUIMessages;
	import org.eclipse.equinox.internal.p2.ui.dialogs.ILayoutConstants;
	import org.eclipse.equinox.internal.p2.ui.viewers.*;
	import org.eclipse.equinox.p2.core.IProvisioningAgent;
	import org.eclipse.equinox.p2.engine.IProfile;
	import org.eclipse.equinox.p2.engine.IProfileRegistry;
	import org.eclipse.equinox.p2.metadata.IInstallableUnit;
	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.jface.viewers.*;
	import org.eclipse.jface.wizard.WizardPage;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.*;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.Rectangle;
	import org.eclipse.swt.layout.*;
	import org.eclipse.swt.widgets.*;
	import org.osgi.framework.BundleContext;
	import org.osgi.util.tracker.ServiceTracker;

	public abstract class AbstractPage extends WizardPage implements Listener {

	protected String currentMessage;
	protected Button destinationBrowseButton;
	protected Combo destinationNameField;
	protected P2ImportExport importexportService = null;
	protected CheckboxTableViewer viewer = null;
	protected Exception finishException;
	protected static IProfileRegistry profileRegistry = null;
	protected static IProvisioningAgent agent = null;

	class TableViewerComparator extends ViewerComparator {
	private int sortColumn = 0;
	private int lastSortColumn = 0;
	private boolean ascending = false;
	private boolean lastAscending = false;

	@Override
	public int compare(Viewer viewer, Object e1, Object e2) {
	IInstallableUnit iu1 = ProvUI.getAdapter(e1, IInstallableUnit.class);
	IInstallableUnit iu2 = ProvUI.getAdapter(e2, IInstallableUnit.class);
	if (iu1 != null && iu2 != null) {
	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, getSortColumn());
	String e2p = tableProvider.getColumnText(e2, getSortColumn());
	@SuppressWarnings("unchecked")
	int result = getComparator().compare(e1p, e2p);
	// Secondary column sort
	if (result == 0) {
	e1p = tableProvider.getColumnText(e1, lastSortColumn);
	e2p = tableProvider.getColumnText(e2, lastSortColumn);
	@SuppressWarnings("unchecked")
	int result2 = getComparator().compare(e1p, e2p);
	return lastAscending ? result2 : (-1) * result2;
	}
	return isAscending() ? result : (-1) * result;
	}
	}
	// we couldn't determine a secondary sort, call it equal
	return 0;
	}
	return super.compare(viewer, e1, e2);
	}

	/**
	* @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;
	}
	}

	static {
	BundleContext context = Platform.getBundle(Constants.Bundle_ID).getBundleContext();
	ServiceTracker<IProvisioningAgent, IProvisioningAgent> tracker = new ServiceTracker<IProvisioningAgent, IProvisioningAgent>(context, IProvisioningAgent.class, null);
	tracker.open();
	agent = tracker.getService();
	tracker.close();
	if (agent != null)
	profileRegistry = (IProfileRegistry) agent.getService(IProfileRegistry.SERVICE_NAME);
	}

	public AbstractPage(String pageName) {
	super(pageName);
	}

	public AbstractPage(String pageName, String title, ImageDescriptor titleImage) {
	super(pageName, title, titleImage);
	}

	protected IProfile getSelfProfile() {
	if (profileRegistry != null) {
	String selfID = System.getProperty("eclipse.p2.profile"); //$NON-NLS-1$
	if (selfID == null)
	selfID = IProfileRegistry.SELF;
	return profileRegistry.getProfile(selfID);
	}
	return null;
	}

	private void createColumns(TableViewer viewer) {
	String[] titles = {Messages.Column_Name, Messages.Column_Version, Messages.Column_Id};
	for (int i = 0; i < titles.length; i++) {
	TableViewerColumn column = new TableViewerColumn(viewer, SWT.NONE);
	column.getColumn().setText(titles[i]);
	column.getColumn().setResizable(true);
	column.getColumn().setMoveable(true);
	if (Messages.Column_Name.equals(titles[i]))
	updateTableSorting(i);
	final int columnIndex = i;
	column.getColumn().addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	updateTableSorting(columnIndex);
	}
	});
	}
	}

	protected void updateTableSorting(int columnIndex) {
	TableViewerComparator comparator = (TableViewerComparator) viewer.getComparator();
	// toggle direction if it's the same column
	if (columnIndex == comparator.getSortColumn()) {
	comparator.setAscending(!comparator.isAscending());
	}
	comparator.setSortColumn(columnIndex);
	viewer.getTable().setSortColumn(viewer.getTable().getColumn(columnIndex));
	viewer.getTable().setSortDirection(comparator.isAscending() ? SWT.UP : SWT.DOWN);
	viewer.refresh(false);
	}

	protected abstract void createContents(Composite composite);

	public void createControl(Composite parent) {
	initializeDialogUnits(parent);
	initializeService();
	Composite composite = new Composite(parent, SWT.NULL);
	GridLayout layout = new GridLayout(1, true);
	layout.horizontalSpacing = 0;
	layout.verticalSpacing = 5;
	composite.setLayout(layout);
	composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL \| GridData.HORIZONTAL_ALIGN_FILL));

	createContents(composite);

	// can not finish initially, but don't want to start with an error
	// message either
	if (!(validDestination() && validateOptionsGroup())) {
	setPageComplete(false);
	}

	setControl(composite);
	giveFocusToDestination();
	Dialog.applyDialogFont(composite);
	}

	protected void createDestinationGroup(Composite parent) {
	Composite composite = new Composite(parent, SWT.BORDER);
	GridLayout layout = new GridLayout();
	layout.numColumns = 3;
	composite.setLayout(layout);
	composite.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, false));

	Label label = new Label(composite, SWT.NONE);
	label.setText(getDestinationLabel());

	destinationNameField = new Combo(composite, SWT.SINGLE \| SWT.BORDER);
	GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL \| GridData.GRAB_HORIZONTAL);
	destinationNameField.setLayoutData(data);
	destinationNameField.addListener(SWT.Modify, this);
	destinationNameField.addListener(SWT.Selection, this);
	destinationNameField.addListener(SWT.FocusIn, new Listener() {

	public void handleEvent(Event event) {
	destinationNameField.clearSelection();
	}
	});
	destinationBrowseButton = new Button(composite, SWT.PUSH);
	destinationBrowseButton.setText(Messages.Page_BUTTON_BROWSER);
	destinationBrowseButton.addListener(SWT.Selection, this);
	destinationBrowseButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
	}

	protected IUColumnConfig[] getColumnConfig() {
	return new IUColumnConfig[] {new IUColumnConfig(ProvUIMessages.ProvUI_NameColumnTitle, IUColumnConfig.COLUMN_NAME, ILayoutConstants.DEFAULT_PRIMARY_COLUMN_WIDTH), new IUColumnConfig(ProvUIMessages.ProvUI_VersionColumnTitle, IUColumnConfig.COLUMN_VERSION, ILayoutConstants.DEFAULT_SMALL_COLUMN_WIDTH), new IUColumnConfig(ProvUIMessages.ProvUI_IdColumnTitle, IUColumnConfig.COLUMN_ID, ILayoutConstants.DEFAULT_COLUMN_WIDTH)};
	}

	protected void createInstallationTable(final Composite parent) {
	Group group = new Group(parent, SWT.NONE);
	GridData griddata = new GridData(GridData.FILL, GridData.FILL, true, true);
	griddata.verticalSpan = griddata.horizontalSpan = 0;
	group.setLayoutData(griddata);
	group.setLayout(new GridLayout(1, false));
	viewer = CheckboxTableViewer.newCheckList(group, SWT.MULTI \| SWT.BORDER);
	final Table table = viewer.getTable();
	table.setHeaderVisible(true);
	table.setLinesVisible(false);
	viewer.setComparator(new TableViewerComparator());
	createColumns(viewer);
	viewer.setContentProvider(getContentProvider());
	viewer.setLabelProvider(getLabelProvider());
	parent.addControlListener(new ControlAdapter() {
	private final int[] columnRate = new int[] {6, 2, 2};

	@Override
	public void controlResized(ControlEvent e) {
	Rectangle area = parent.getClientArea();
	Point size = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
	ScrollBar vBar = table.getVerticalBar();
	int width = area.width - table.computeTrim(0, 0, 0, 0).width - vBar.getSize().x;
	if (size.y > area.height + table.getHeaderHeight()) {
	// Subtract the scrollbar width from the total column width
	// if a vertical scrollbar will be required
	Point vBarSize = vBar.getSize();
	width -= vBarSize.x;
	}
	Point oldSize = table.getSize();
	TableColumn[] columns = table.getColumns();
	int hasUsed = 0, i = 0;
	if (oldSize.x > area.width) {
	// table is getting smaller so make the columns
	// smaller first and then resize the table to
	// match the client area width
	for (; i < columns.length - 1; i++) {
	columns[i].setWidth(width * columnRate[i] / 10);
	hasUsed += columns[i].getWidth();
	}
	columns[columns.length - 1].setWidth(width - hasUsed);
	table.setSize(area.width, area.height);
	} else {
	// table is getting bigger so make the table
	// bigger first and then make the columns wider
	// to match the client area width
	table.setSize(area.width, area.height);
	for (; i < columns.length - 1; i++) {
	columns[i].setWidth(width * columnRate[i] / 10);
	hasUsed += columns[i].getWidth();
	}
	columns[columns.length - 1].setWidth(width - hasUsed);
	}
	}
	});
	ICheckStateProvider provider = getViewerDefaultState();
	if (provider != null)
	viewer.setCheckStateProvider(provider);
	else
	viewer.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(SelectionChangedEvent event) {
	updatePageCompletion();
	}
	});
	viewer.getControl().setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true));
	viewer.getControl().setSize(300, 200);
	viewer.setInput(getInput());
	Composite buttons = new Composite(group, SWT.NONE);
	buttons.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, false));
	buttons.setLayout(new RowLayout(SWT.HORIZONTAL));
	Button selectAll = new Button(buttons, SWT.PUSH);
	selectAll.setText(Messages.AbstractPage_ButtonSelectAll);
	selectAll.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	for (TableItem item : viewer.getTable().getItems()) {
	if (!item.getChecked()) {
	item.setChecked(true);
	Event event = new Event();
	event.widget = item.getParent();
	event.detail = SWT.CHECK;
	event.item = item;
	event.type = SWT.Selection;
	viewer.getTable().notifyListeners(SWT.Selection, event);
	}
	}
	updatePageCompletion();
	}
	});
	Button deselectAll = new Button(buttons, SWT.PUSH);
	deselectAll.setText(Messages.AbstractPage_ButtonDeselectAll);
	deselectAll.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	viewer.setAllChecked(false);
	updatePageCompletion();
	}
	});
	}

	protected ICheckStateProvider getViewerDefaultState() {
	return null;
	}

	protected ITableLabelProvider getLabelProvider() {
	return new IUDetailsLabelProvider(null, getColumnConfig(), null);
	}

	protected IContentProvider getContentProvider() {
	return new DeferredQueryContentProvider();
	}

	protected boolean determinePageCompletion() {
	currentMessage = null;
	// validate groups in order of priority so error message is the most important one
	boolean complete = validateDestinationGroup() && validateOptionsGroup();

	// Avoid draw flicker by not clearing the error
	// message unless all is valid.
	if (complete) {
	setErrorMessage(null);
	} else {
	setErrorMessage(currentMessage);
	}

	return complete;
	}

	protected abstract void doFinish() throws Exception;

	protected int getBrowseDialogStyle() {
	return SWT.OPEN;
	}

	/**
	* returns the destination label
	* @return non null string
	*/
	protected abstract String getDestinationLabel();

	/**
	* Answer the contents of self's destination specification widget
	*
	* @return java.lang.String
	*/
	protected String getDestinationValue() {
	return destinationNameField.getText().trim();
	}

	/**
	* return the title of dialog
	* @return non null string
	*/
	protected abstract String getDialogTitle();

	protected abstract Object getInput();

	protected abstract String getInvalidDestinationMessage();

	protected String getNoOptionsMessage() {
	return Messages.PAGE_NOINSTALLTION_ERROR;
	}

	protected abstract void giveFocusToDestination();

	/**
	* Open an appropriate destination browser so that the user can specify a
	* source to import from
	*/
	protected void handleDestinationBrowseButtonPressed() {
	FileDialog dialog = new FileDialog(getContainer().getShell(), getBrowseDialogStyle() \| SWT.SHEET);
	dialog.setText(getDialogTitle());
	dialog.setFilterPath(getDestinationValue());
	dialog.setFilterExtensions(new String[] {Messages.EXTENSION_p2F, Messages.EXTENSION_ALL});
	dialog.setFilterNames(new String[] {Messages.EXTENSION_p2F_NAME, Messages.EXTENSION_ALL_NAME});
	String selectedFileName = dialog.open();

	if (selectedFileName != null) {
	if (!selectedFileName.endsWith(Messages.EXTENSION_p2F.substring(1)))
	selectedFileName += Messages.EXTENSION_p2F.substring(1);
	setDestinationValue(selectedFileName);
	}
	}

	public void handleEvent(Event event) {
	Widget source = event.widget;

	if (source == destinationBrowseButton) {
	handleDestinationBrowseButtonPressed();
	} else
	handleDestinationChanged(getDestinationValue());
	updatePageCompletion();
	}

	protected void handleDestinationChanged(String newDestination) {
	// do nothing
	}

	protected void initializeService() {
	ServiceTracker<P2ImportExport, P2ImportExport> tracker = new ServiceTracker<P2ImportExport, P2ImportExport>(Platform.getBundle(Constants.Bundle_ID).getBundleContext(), P2ImportExport.class.getName(), null);
	tracker.open();
	importexportService = tracker.getService();
	tracker.close();
	}

	protected void setDestinationValue(String selectedFileName) {
	destinationNameField.setText(selectedFileName);
	}

	/**
	* Determine if the page is complete and update the page appropriately.
	*/
	protected void updatePageCompletion() {
	boolean pageComplete = determinePageCompletion();
	setPageComplete(pageComplete);
	if (pageComplete) {
	setMessage(null);
	}
	}

	/**
	* Validate the destination group.
	* @return <code>true</code> if the group is valid. If
	* not set the error message and return <code>false</code>.
	*/
	protected boolean validateDestinationGroup() {
	if (!validDestination()) {
	currentMessage = getInvalidDestinationMessage();
	return false;
	}

	return true;
	}

	protected boolean validateOptionsGroup() {
	if (viewer == null \|\| viewer.getCheckedElements().length > 0)
	return true;

	currentMessage = getNoOptionsMessage();
	return false;
	}

	protected boolean validDestination() {
	if (this.destinationNameField == null)
	return true;
	File file = new File(getDestinationValue());
	return !(file.getPath().length() <= 0 \|\| file.isDirectory());
	}
	}