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/*
* (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());
}
}
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