| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| package org.eclipse.compare.internal; |
| |
| import java.io.StringWriter; |
| import java.lang.reflect.InvocationTargetException; |
| |
| import org.eclipse.swt.widgets.Shell; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| |
| import org.eclipse.jface.dialogs.ErrorDialog; |
| import org.eclipse.jface.dialogs.MessageDialog; |
| |
| /** |
| * The default exception handler shows an error dialog when one of its handle methods |
| * is called. If the passed exception is a <code>CoreException</code> an error dialog |
| * pops up showing the exception's status information. For a <code>InvocationTargetException</code> |
| * a normal message dialog pops up showing the exception's message. Additionally the exception |
| * is written to the platform log. |
| */ |
| public class ExceptionHandler { |
| |
| private static ExceptionHandler fgInstance= new ExceptionHandler(); |
| |
| /** |
| * Logs the given exception using the platform's logging mechanism. The exception is |
| * logged as an error with the error code <code>JavaStatusConstants.INTERNAL_ERROR</code>. |
| */ |
| public static void log(Throwable t, String message) { |
| CompareUIPlugin.log(new Status(IStatus.ERROR, CompareUIPlugin.getPluginId(), |
| CompareUIPlugin.INTERNAL_ERROR, message, t)); |
| } |
| |
| /** |
| * Handles the given <code>CoreException</code>. The workbench shell is used as a parent |
| * for the dialog window. |
| * |
| * @param e the <code>CoreException</code> to be handled |
| * @param title the dialog window's window title |
| * @param message message to be displayed by the dialog window |
| */ |
| public static void handle(CoreException e, String title, String message) { |
| handle(e, CompareUIPlugin.getShell(), title, message); |
| } |
| |
| /** |
| * Handles the given <code>CoreException</code>. |
| * |
| * @param e the <code>CoreException</code> to be handled |
| * @param parent the dialog window's parent shell |
| * @param title the dialog window's window title |
| * @param message message to be displayed by the dialog window |
| */ |
| public static void handle(CoreException e, Shell parent, String title, String message) { |
| fgInstance.perform(e, parent, title, message); |
| } |
| |
| /** |
| * Handles the given <code>InvocationTargetException</code>. The workbench shell is used |
| * as a parent for the dialog window. |
| * |
| * @param e the <code>InvocationTargetException</code> to be handled |
| * @param title the dialog window's window title |
| * @param message message to be displayed by the dialog window |
| */ |
| public static void handle(InvocationTargetException e, String title, String message) { |
| handle(e, CompareUIPlugin.getShell(), title, message); |
| } |
| |
| /** |
| * Handles the given <code>InvocationTargetException</code>. |
| * |
| * @param e the <code>InvocationTargetException</code> to be handled |
| * @param parent the dialog window's parent shell |
| * @param title the dialog window's window title |
| * @param message message to be displayed by the dialog window |
| */ |
| public static void handle(InvocationTargetException e, Shell parent, String title, String message) { |
| fgInstance.perform(e, parent, title, message); |
| } |
| |
| //---- Hooks for subclasses to control exception handling ------------------------------------ |
| |
| protected void perform(CoreException e, Shell shell, String title, String message) { |
| CompareUIPlugin.log(e); |
| IStatus status= e.getStatus(); |
| if (status != null) { |
| ErrorDialog.openError(shell, title, message, status); |
| } else { |
| displayMessageDialog(e, e.getMessage(), shell, title, message); |
| } |
| } |
| |
| protected void perform(InvocationTargetException e, Shell shell, String title, String message) { |
| Throwable target= e.getTargetException(); |
| if (target instanceof CoreException) { |
| perform((CoreException)target, shell, title, message); |
| } else { |
| CompareUIPlugin.log(e); |
| if (e.getMessage() != null && e.getMessage().length() > 0) { |
| displayMessageDialog(e, e.getMessage(), shell, title, message); |
| } else { |
| displayMessageDialog(e, target.getMessage(), shell, title, message); |
| } |
| } |
| } |
| |
| //---- Helper methods ----------------------------------------------------------------------- |
| |
| private void displayMessageDialog(Throwable t, String exceptionMessage, Shell shell, String title, String message) { |
| StringWriter msg= new StringWriter(); |
| if (message != null) { |
| msg.write(message); |
| msg.write("\n\n"); //$NON-NLS-1$ |
| } |
| if (exceptionMessage == null || exceptionMessage.length() == 0) |
| msg.write(CompareMessages.getString("ExceptionDialog.seeErrorLogMessage")); //$NON-NLS-1$ |
| else |
| msg.write(exceptionMessage); |
| MessageDialog.openError(shell, title, msg.toString()); |
| } |
| } |