Java tutorial
/******************************************************************************* * Copyright (c) 2015 OPCoach 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: * Olivier Prouvost <olivier.prouvost@opcoach.com> - initial API and implementation (bug #451116) * Simon Scholz <simon.scholz@vogella.com> - Bug 466785 *******************************************************************************/ package org.eclipse.e4.tools.bundles.spy; import java.util.Iterator; import javax.annotation.PostConstruct; import javax.inject.Inject; import org.eclipse.e4.core.contexts.ContextInjectionFactory; import org.eclipse.e4.core.contexts.IEclipseContext; import org.eclipse.e4.internal.tools.bundles.spy.BundleDataFilter; import org.eclipse.e4.internal.tools.bundles.spy.BundleDataProvider; import org.eclipse.e4.ui.di.Focus; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.ImageRegistry; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ColumnViewerToolTipSupport; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.Text; import org.osgi.framework.Bundle; import org.osgi.framework.BundleContext; import org.osgi.framework.BundleException; import org.osgi.framework.FrameworkUtil; /** * This class is the main part of the bundle spy. It displays a tableviewer with * all bundles */ public class BundleSpyPart { private static final String ICON_REFRESH = "icons/refresh.png"; public static final String ICON_STATE_ACTIVE = "icons/state_active.png"; public static final String ICON_STATE_STARTING = "icons/state_starting.png"; public static final String ICON_STATE_STOPPING = "icons/state_stopping.png"; public static final String ICON_STATE_RESOLVED = "icons/state_resolved.png"; public static final String ICON_STATE_INSTALLED = "icons/state_installed.png"; public static final String ICON_STATE_UNINSTALLED = "icons/state_uninstalled.png"; public static final String ICON_START = "icons/start.png"; public static final String ICON_STOP = "icons/stop.png"; private TableViewer bundlesTableViewer; private Text filterText; private Button showOnlyFilteredElements; private BundleDataFilter bundleFilter; @Inject private IEclipseContext ctx; /** Store the values to set it when it is reopened */ private static String lastFilterText = null; private static boolean lastShowFiltered = false; /** * Create contents of the view part. */ @PostConstruct public void createControls(Composite parent) { ImageRegistry imgReg = initializeImageRegistry(); // Set a filter in context (-> null at the begining). bundleFilter = new BundleDataFilter(); ctx.set(BundleDataFilter.class, bundleFilter); parent.setLayout(new GridLayout(1, false)); final Composite comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout(5, false)); Button refreshButton = new Button(comp, SWT.FLAT); refreshButton.setImage(imgReg.get(ICON_REFRESH)); refreshButton.setToolTipText("Refresh the contexts"); refreshButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { bundlesTableViewer.refresh(true); } }); filterText = new Text(comp, SWT.SEARCH | SWT.ICON_SEARCH); GridDataFactory.fillDefaults().hint(200, SWT.DEFAULT).applyTo(filterText); filterText.setMessage("Search data"); filterText.setToolTipText( "Highlight the bundles where the contained objects contains this string.\n" + "Case is ignored."); if (lastFilterText != null) filterText.setText(lastFilterText); bundleFilter.setPattern(lastFilterText); filterText.addKeyListener(new KeyAdapter() { @Override public void keyReleased(KeyEvent e) { String textToSearch = filterText.getText(); lastFilterText = textToSearch; boolean enableButton = textToSearch.length() > 0; // Enable/disable button for filtering showOnlyFilteredElements.setEnabled(enableButton); // Then update filters and viewers bundleFilter.setPattern(textToSearch); setFilter(); bundlesTableViewer.refresh(true); } }); showOnlyFilteredElements = new Button(comp, SWT.CHECK); showOnlyFilteredElements.setText("Show Only Filtered"); showOnlyFilteredElements.setToolTipText("Show only the filtered items in the bundle table "); showOnlyFilteredElements.setEnabled((lastFilterText != null) && (lastFilterText.length() > 0)); showOnlyFilteredElements.setSelection(lastShowFiltered); showOnlyFilteredElements.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { lastShowFiltered = showOnlyFilteredElements.getSelection(); setFilter(); } }); startButton = new Button(comp, SWT.FLAT); startButton.setImage(imgReg.get(ICON_START)); startButton.setToolTipText("Start the selected bundles not yet started"); startButton.setEnabled(false); startButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { IStructuredSelection sel = (IStructuredSelection) bundlesTableViewer.getSelection(); Iterator<?> iter = sel.iterator(); while (iter.hasNext()) { Bundle b = (Bundle) iter.next(); try { b.start(); } catch (BundleException e1) { e1.printStackTrace(); } } bundlesTableViewer.refresh(); updateButtonStatuses(sel); } }); stopButton = new Button(comp, SWT.FLAT); stopButton.setImage(imgReg.get(ICON_STOP)); stopButton.setToolTipText("Stop the selected bundles not yet stopped"); stopButton.setEnabled(false); stopButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { if (MessageDialog.openConfirm(((Control) e.getSource()).getShell(), "Confirm Bundle Stop", "Stopping a bundle may cause problems in your current application.\nUse this button only for your bundles under testing\n\nDo you confirm you want to stop the selected started bundle(s) ? ")) { IStructuredSelection sel = (IStructuredSelection) bundlesTableViewer.getSelection(); Iterator<?> iter = sel.iterator(); while (iter.hasNext()) { Bundle b = (Bundle) iter.next(); try { b.stop(); } catch (BundleException e1) { e1.printStackTrace(); } } bundlesTableViewer.refresh(); updateButtonStatuses(sel); } } }); // Create the customer table with 2 columns: firstname and name bundlesTableViewer = new TableViewer(parent); final Table cTable = bundlesTableViewer.getTable(); cTable.setHeaderVisible(true); cTable.setLinesVisible(true); GridData gd_cTable = new GridData(SWT.FILL, SWT.FILL, true, true); // gd_cTable.verticalAlignment = SWT.TOP; cTable.setLayoutData(gd_cTable); // Create the first column for bundle name addColumn(bundlesTableViewer, 35, "State", BundleDataProvider.COL_STATE); addColumn(bundlesTableViewer, 200, "Bundle Name", BundleDataProvider.COL_NAME); addColumn(bundlesTableViewer, 200, "Version", BundleDataProvider.COL_VERSION); // Set input data and content provider (default ArrayContentProvider) bundlesTableViewer.setContentProvider(ArrayContentProvider.getInstance()); // Get the list of bundles in platform using bundle context... BundleContext bc = BundleSpyActivator.getContext(); bundlesTableViewer.setInput(bc.getBundles()); bundlesTableViewer.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { updateButtonStatuses((IStructuredSelection) event.getSelection()); } }); ColumnViewerToolTipSupport.enableFor(bundlesTableViewer); } /** Update the stop and start buttons depending on current selection */ protected void updateButtonStatuses(IStructuredSelection selection) { // startButton is enabled if at least one bundle is not active // stopButton is enabled if at least one bundle is active boolean oneBundleIsActive = false; boolean oneBundleIsNotActive = false; Iterator<?> iter = selection.iterator(); while (iter.hasNext()) { Bundle b = (Bundle) iter.next(); oneBundleIsActive = oneBundleIsActive || (b.getState() == Bundle.ACTIVE); oneBundleIsNotActive = oneBundleIsNotActive || (b.getState() != Bundle.ACTIVE); } startButton.setEnabled(oneBundleIsNotActive); stopButton.setEnabled(oneBundleIsActive); } private void addColumn(final TableViewer parentTable, int width, String title, final int column) { TableViewerColumn col = new TableViewerColumn(bundlesTableViewer, SWT.NONE); col.getColumn().setWidth(width); col.getColumn().setText(title); final BundleDataProvider bdp = ContextInjectionFactory.make(BundleDataProvider.class, ctx); bdp.setColumn(column); col.setLabelProvider(bdp); col.getColumn().addSelectionListener(new SelectionAdapter() { private int turnAround = 1; @Override public void widgetSelected(SelectionEvent e) { turnAround *= -1; parentTable.setComparator(new ViewerComparator() { @Override public int compare(Viewer viewer, Object e1, Object e2) { if (BundleDataProvider.COL_STATE == column) { Bundle b1 = (Bundle) e1; Bundle b2 = (Bundle) e2; return turnAround(Integer.compare(b1.getState(), b2.getState())); } return turnAround(bdp.getText(e1).compareTo(bdp.getText(e2))); } }); } private int turnAround(int compare) { return compare * turnAround; } }); } private static final ViewerFilter[] NO_FILTER = new ViewerFilter[0]; private Button stopButton; private Button startButton; /** Set the filter on table */ public void setFilter() { if (showOnlyFilteredElements.isEnabled() && showOnlyFilteredElements.getSelection()) { bundlesTableViewer.setFilters(new ViewerFilter[] { bundleFilter }); } else { bundlesTableViewer.setFilters(NO_FILTER); } } @Focus public void setFocus() { bundlesTableViewer.getControl().setFocus(); } private ImageRegistry initializeImageRegistry() { Bundle b = FrameworkUtil.getBundle(this.getClass()); ImageRegistry imgReg = new ImageRegistry(); imgReg.put(ICON_REFRESH, ImageDescriptor.createFromURL(b.getEntry(ICON_REFRESH))); imgReg.put(ICON_STATE_ACTIVE, ImageDescriptor.createFromURL(b.getEntry(ICON_STATE_ACTIVE))); imgReg.put(ICON_STATE_RESOLVED, ImageDescriptor.createFromURL(b.getEntry(ICON_STATE_RESOLVED))); imgReg.put(ICON_STATE_STARTING, ImageDescriptor.createFromURL(b.getEntry(ICON_STATE_STARTING))); imgReg.put(ICON_STATE_STOPPING, ImageDescriptor.createFromURL(b.getEntry(ICON_STATE_STOPPING))); imgReg.put(ICON_STATE_INSTALLED, ImageDescriptor.createFromURL(b.getEntry(ICON_STATE_INSTALLED))); imgReg.put(ICON_STATE_UNINSTALLED, ImageDescriptor.createFromURL(b.getEntry(ICON_STATE_UNINSTALLED))); imgReg.put(ICON_START, ImageDescriptor.createFromURL(b.getEntry(ICON_START))); imgReg.put(ICON_STOP, ImageDescriptor.createFromURL(b.getEntry(ICON_STOP))); ctx.set(ImageRegistry.class, imgReg); return imgReg; } }