Java tutorial
/******************************************************************************* * Copyright (c) 2003, 2008 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 *******************************************************************************/ package org.eclipse.ui.internal.dialogs; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.Platform; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.osgi.util.NLS; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.Clipboard; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; 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.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.internal.ConfigurationInfo; import org.eclipse.ui.internal.IWorkbenchHelpContextIds; import org.eclipse.ui.internal.WorkbenchMessages; import org.eclipse.ui.internal.WorkbenchPlugin; /** * Displays system information about the eclipse application. The content of * what is displayed is selectable through the * <code>org.eclipse.ui.systemSummaryExtensions</code> extension point. */ public final class AboutSystemDialog extends ProductInfoDialog { private Text text; private final static int BROWSE_ERROR_LOG_BUTTON = IDialogConstants.CLIENT_ID; private final static int COPY_TO_CLIPBOARD_BUTTON = IDialogConstants.CLIENT_ID + 1; private final static String ERROR_LOG_COPY_FILENAME = "log"; //$NON-NLS-1$ /** * Create an instance of this dialog. * * @param parentShell the parent shell */ public AboutSystemDialog(Shell parentShell) { super(parentShell); } /* (non-Javadoc) * Method declared on Window. */ protected void configureShell(Shell newShell) { super.configureShell(newShell); newShell.setText(WorkbenchMessages.SystemSummary_title); PlatformUI.getWorkbench().getHelpSystem().setHelp(newShell, IWorkbenchHelpContextIds.SYSTEM_SUMMARY_DIALOG); } /* (non-Javadoc) * Method declared on Dialog. */ protected void createButtonsForButtonBar(Composite parent) { parent.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Button button = createButton(parent, BROWSE_ERROR_LOG_BUTTON, WorkbenchMessages.AboutSystemDialog_browseErrorLogName, false); String filename = Platform.getLogFileLocation().toOSString(); button.setEnabled(new File(filename).exists()); createButton(parent, COPY_TO_CLIPBOARD_BUTTON, WorkbenchMessages.AboutSystemDialog_copyToClipboardName, false); new Label(parent, SWT.NONE).setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); GridLayout layout = (GridLayout) parent.getLayout(); layout.numColumns++; layout.makeColumnsEqualWidth = false; createButton(parent, IDialogConstants.CLOSE_ID, IDialogConstants.CLOSE_LABEL, true); } /* (non-Javadoc) * Method declared on Dialog. */ protected Control createDialogArea(Composite parent) { Composite outer = (Composite) super.createDialogArea(parent); text = new Text(outer, SWT.MULTI | SWT.BORDER | SWT.READ_ONLY | SWT.V_SCROLL | SWT.NO_FOCUS | SWT.H_SCROLL); text.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND)); GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL); gridData.grabExcessVerticalSpace = true; gridData.grabExcessHorizontalSpace = true; gridData.heightHint = convertVerticalDLUsToPixels(300); gridData.widthHint = convertHorizontalDLUsToPixels(400); text.setLayoutData(gridData); text.setText(ConfigurationInfo.getSystemSummary()); text.setFont(JFaceResources.getTextFont()); return outer; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#buttonPressed(int) */ protected void buttonPressed(int buttonId) { switch (buttonId) { case IDialogConstants.CLOSE_ID: close(); break; case BROWSE_ERROR_LOG_BUTTON: openErrorLogBrowser(); break; case COPY_TO_CLIPBOARD_BUTTON: runCopyToClipboard(); break; } super.buttonPressed(buttonId); } private void openErrorLogBrowser() { String filename = Platform.getLogFileLocation().toOSString(); File log = new File(filename); if (log.exists()) { // Make a copy of the file with a temporary name. // Working around an issue with windows file associations/browser malfunction // whereby the browser doesn't open on ".log" and we aren't returned an error. // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=97783 File logCopy = makeDisplayCopy(log); if (logCopy != null) { openLink("file:///" + logCopy.getAbsolutePath()); //$NON-NLS-1$ return; } // Couldn't make copy, try to open the original log. // We try the original in this case rather than putting up an error, // because the copy could fail due to an I/O or out of space problem. // In that case we may still be able to show the original log, // depending on the platform. The risk is that users with configurations // that have bug #97783 will still get nothing (vs. an error) but we'd rather // try again than put up an error dialog on platforms where the ability to // view the original log works just fine. openLink("file:///" + filename); //$NON-NLS-1$ return; } MessageDialog.openInformation(getShell(), WorkbenchMessages.AboutSystemDialog_noLogTitle, NLS.bind(WorkbenchMessages.AboutSystemDialog_noLogMessage, filename)); } /** * Returns a copy of the given file to be used for display in * a browser. * * @return the file, or <code>null</code> */ private File makeDisplayCopy(File file) { IPath path = WorkbenchPlugin.getDefault().getDataLocation(); if (path == null) { return null; } path = path.append(ERROR_LOG_COPY_FILENAME); File copy = path.toFile(); FileReader in = null; FileWriter out = null; try { in = new FileReader(file); // don't append data, overwrite what was there out = new FileWriter(copy); char buffer[] = new char[4096]; int count; while ((count = in.read(buffer, 0, buffer.length)) > 0) { out.write(buffer, 0, count); } } catch (FileNotFoundException e) { return null; } catch (IOException e) { return null; } finally { try { if (in != null) { in.close(); } if (out != null) { out.close(); } } catch (IOException e) { return null; } } return copy; } private void runCopyToClipboard() { if (text == null) { return; } Clipboard clipboard = null; try { clipboard = new Clipboard(getShell().getDisplay()); clipboard.setContents(new Object[] { text.getText() }, new Transfer[] { TextTransfer.getInstance() }); } finally { if (clipboard != null) { clipboard.dispose(); } } } }