ErrorFeedback.java

   1 package org.argeo.eclipse.ui;
   2
   3 import java.io.PrintWriter;
   4 import java.io.StringWriter;
   5
   6 import org.apache.commons.logging.Log;
   7 import org.apache.commons.logging.LogFactory;
   8 import org.eclipse.jface.dialogs.IMessageProvider;
   9 import org.eclipse.jface.dialogs.TitleAreaDialog;
  10 import org.eclipse.swt.SWT;
  11 import org.eclipse.swt.graphics.Point;
  12 import org.eclipse.swt.layout.GridData;
  13 import org.eclipse.swt.layout.GridLayout;
  14 import org.eclipse.swt.widgets.Composite;
  15 import org.eclipse.swt.widgets.Control;
  16 import org.eclipse.swt.widgets.Display;
  17 import org.eclipse.swt.widgets.Shell;
  18 import org.eclipse.swt.widgets.Text;
  19 import org.eclipse.ui.PlatformUI;
  20
  21 /** Generic error dialog to be used in try/catch blocks */
  22 public class ErrorFeedback extends TitleAreaDialog {
  23         private final static Log log = LogFactory.getLog(ErrorFeedback.class);
  24
  25         private final String message;
  26         private final Throwable exception;
  27
  28         public static void show(String message, Throwable e) {
  29                 // rethrow ThreaDeath in order to make sure that RAP will properly clean
  30                 // up the UI thread
  31                 if (e instanceof ThreadDeath)
  32                         throw (ThreadDeath) e;
  33
  34                 new ErrorFeedback(getDisplay().getActiveShell(), message, e).open();
  35         }
  36
  37         public static void show(String message) {
  38                 new ErrorFeedback(getDisplay().getActiveShell(), message, null).open();
  39         }
  40
  41         /** Tries to find a display */
  42         private static Display getDisplay() {
  43                 try {
  44                         Display display = PlatformUI.getWorkbench().getDisplay();
  45                         if (display != null)
  46                                 return display;
  47                         else
  48                                 return Display.getDefault();
  49                 } catch (Exception e) {
  50                         return Display.getCurrent();
  51                 }
  52         }
  53
  54         public ErrorFeedback(Shell parentShell, String message, Throwable e) {
  55                 super(parentShell);
  56                 this.message = message;
  57                 this.exception = e;
  58                 log.error(message, e);
  59         }
  60
  61         protected Point getInitialSize() {
  62                 if (exception != null)
  63                         return new Point(800, 600);
  64                 else
  65                         return new Point(400, 300);
  66         }
  67
  68         @Override
  69         protected Control createDialogArea(Composite parent) {
  70                 Composite dialogarea = (Composite) super.createDialogArea(parent);
  71                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  72                 Composite composite = new Composite(dialogarea, SWT.NONE);
  73                 composite.setLayout(new GridLayout(2, false));
  74                 composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  75
  76                 setMessage(message != null ? message
  77                                 + (exception != null ? ": " + exception.getMessage() : "")
  78                                 : exception != null ? exception.getMessage() : "Unkown Error",
  79                                 IMessageProvider.ERROR);
  80
  81                 if (exception != null) {
  82                         Text stack = new Text(composite, SWT.MULTI | SWT.LEAD | SWT.BORDER
  83                                         | SWT.V_SCROLL | SWT.H_SCROLL);
  84                         stack.setEditable(false);
  85                         stack.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  86                         StringWriter sw = new StringWriter();
  87                         exception.printStackTrace(new PrintWriter(sw));
  88                         stack.setText(sw.toString());
  89                 }
  90
  91                 parent.pack();
  92                 return composite;
  93         }
  94
  95         protected void configureShell(Shell shell) {
  96                 super.configureShell(shell);
  97                 shell.setText("Error");
  98         }
  99
 100 }