Java tutorial
/******************************************************************************* * Copyright (c) 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.wst.server.discovery.internal.wizard; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IStatus; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.wizard.WizardPage; 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.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.List; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.MenuItem; import org.eclipse.wst.server.discovery.internal.Messages; public class ErrorWizardPage extends WizardPage { /** * The nesting indent. */ private static final String NESTING_INDENT = " "; //$NON-NLS-1$ /** * The SWT list control that displays the error details. */ private List list; /** * Message (a localized string). */ protected String message; /** * The main status object. */ private IStatus status; /** * The current clipboard. To be disposed when closing the dialog. */ private Clipboard clipboard; public ErrorWizardPage() { super("error-page"); setTitle(Messages.wizExtensionTitle); setDescription(Messages.wizExtensionDescription); } public void createControl(Composite parent) { Control control = createDropDownList(parent); setControl(control); } /** * Set the status displayed by this error dialog to the given status. This * only affects the status displayed by the Details list. The message, image * and title should be updated by the subclass, if desired. * * @param status * the status to be displayed in the details list */ public void setStatus(IStatus status) { if (this.status != status) this.status = status; setDescription(status.getMessage()); if (list != null && !list.isDisposed()) { list.removeAll(); populateList(list); } } /** * Create this dialog's drop-down list component. * * @param parent * the parent composite * @return the drop-down list component */ protected List createDropDownList(Composite parent) { list = new List(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.MULTI); populateList(list); GridData data = new GridData(SWT.FILL, SWT.FILL, false, false); data.widthHint = 225; list.setLayoutData(data); list.setFont(parent.getFont()); Menu copyMenu = new Menu(list); MenuItem copyItem = new MenuItem(copyMenu, SWT.NONE); copyItem.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { copyToClipboard(); } public void widgetDefaultSelected(SelectionEvent e) { copyToClipboard(); } }); copyItem.setText(JFaceResources.getString("copy")); //$NON-NLS-1$ list.setMenu(copyMenu); //listCreated = true; return list; } /** * Copy the contents of the statuses to the clipboard. */ protected void copyToClipboard() { if (clipboard != null) clipboard.dispose(); StringBuffer statusBuffer = new StringBuffer(); populateCopyBuffer(status, statusBuffer, 0); clipboard = new Clipboard(list.getDisplay()); clipboard.setContents(new Object[] { statusBuffer.toString() }, new Transfer[] { TextTransfer.getInstance() }); } public void dispose() { if (clipboard != null) clipboard.dispose(); super.dispose(); } /** * Put the details of the status of the error onto the stream. * * @param buildingStatus * @param buffer * @param nesting */ private void populateCopyBuffer(IStatus buildingStatus, StringBuffer buffer, int nesting) { for (int i = 0; i < nesting; i++) buffer.append(NESTING_INDENT); buffer.append(buildingStatus.getMessage()); buffer.append("\n"); //$NON-NLS-1$ // Look for a nested core exception Throwable t = buildingStatus.getException(); if (t instanceof CoreException) { CoreException ce = (CoreException) t; populateCopyBuffer(ce.getStatus(), buffer, nesting + 1); } else if (t != null) { // Include low-level exception message for (int i = 0; i < nesting; i++) buffer.append(NESTING_INDENT); String message = t.getLocalizedMessage(); if (message == null) message = t.toString(); buffer.append(message); buffer.append("\n"); //$NON-NLS-1$ } IStatus[] children = buildingStatus.getChildren(); for (int i = 0; i < children.length; i++) populateCopyBuffer(children[i], buffer, nesting + 1); } /** * Populates the list using this error dialog's status object. This walks * the child static of the status object and displays them in a list. The * format for each entry is status_path : status_message If the status's * path was null then it (and the colon) are omitted. * * @param listToPopulate * The list to fill. */ private void populateList(List listToPopulate) { populateList(listToPopulate, status, 0, true); } /** * Populate the list with the messages from the given status. Traverse the * children of the status deeply and also traverse CoreExceptions that * appear in the status. * * @param listToPopulate * the list to populate * @param buildingStatus * the status being displayed * @param nesting * the nesting level (increases one level for each level of * children) * @param includeStatus * whether to include the buildingStatus in the display or just * its children */ private void populateList(List listToPopulate, IStatus buildingStatus, int nesting, boolean includeStatus) { Throwable t = buildingStatus.getException(); boolean isCoreException = t instanceof CoreException; boolean incrementNesting = false; if (includeStatus) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < nesting; i++) sb.append(NESTING_INDENT); String message = buildingStatus.getMessage(); sb.append(message); listToPopulate.add(sb.toString()); incrementNesting = true; } if (!isCoreException && t != null) { // Include low-level exception message StringBuffer sb = new StringBuffer(); for (int i = 0; i < nesting; i++) sb.append(NESTING_INDENT); String message = t.getLocalizedMessage(); if (message == null) message = t.toString(); sb.append(message); listToPopulate.add(sb.toString()); incrementNesting = true; } if (incrementNesting) nesting++; // Look for a nested core exception if (isCoreException) { CoreException ce = (CoreException) t; IStatus eStatus = ce.getStatus(); // Only print the exception message if it is not contained in the // parent message if (message == null || message.indexOf(eStatus.getMessage()) == -1) { populateList(listToPopulate, eStatus, nesting, true); } } // Look for child status IStatus[] children = buildingStatus.getChildren(); for (int i = 0; i < children.length; i++) populateList(listToPopulate, children[i], nesting, true); } }