base/runtime/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/ErrorFeedback.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui;
  17
  18 import java.io.PrintWriter;
  19 import java.io.StringWriter;
  20
  21 import org.apache.commons.logging.Log;
  22 import org.apache.commons.logging.LogFactory;
  23 import org.eclipse.jface.dialogs.IMessageProvider;
  24 import org.eclipse.jface.dialogs.TitleAreaDialog;
  25 import org.eclipse.swt.SWT;
  26 import org.eclipse.swt.graphics.Point;
  27 import org.eclipse.swt.layout.GridData;
  28 import org.eclipse.swt.layout.GridLayout;
  29 import org.eclipse.swt.widgets.Composite;
  30 import org.eclipse.swt.widgets.Control;
  31 import org.eclipse.swt.widgets.Display;
  32 import org.eclipse.swt.widgets.Shell;
  33 import org.eclipse.swt.widgets.Text;
  34 import org.eclipse.ui.PlatformUI;
  35
  36 /** Generic error dialog to be used in try/catch blocks */
  37 public class ErrorFeedback extends TitleAreaDialog {
  38         private final static Log log = LogFactory.getLog(ErrorFeedback.class);
  39
  40         private final String message;
  41         private final Throwable exception;
  42
  43         public static void show(String message, Throwable e) {
  44                 // rethrow ThreaDeath in order to make sure that RAP will properly clean
  45                 // up the UI thread
  46                 if (e instanceof ThreadDeath)
  47                         throw (ThreadDeath) e;
  48
  49                 new ErrorFeedback(getDisplay().getActiveShell(), message, e).open();
  50         }
  51
  52         public static void show(String message) {
  53                 new ErrorFeedback(getDisplay().getActiveShell(), message, null).open();
  54         }
  55
  56         /** Tries to find a display */
  57         private static Display getDisplay() {
  58                 try {
  59                         Display display = PlatformUI.getWorkbench().getDisplay();
  60                         if (display != null)
  61                                 return display;
  62                         else
  63                                 return Display.getDefault();
  64                 } catch (Exception e) {
  65                         return Display.getCurrent();
  66                 }
  67         }
  68
  69         public ErrorFeedback(Shell parentShell, String message, Throwable e) {
  70                 super(parentShell);
  71                 this.message = message;
  72                 this.exception = e;
  73                 log.error(message, e);
  74         }
  75
  76         protected Point getInitialSize() {
  77                 if (exception != null)
  78                         return new Point(800, 600);
  79                 else
  80                         return new Point(400, 300);
  81         }
  82
  83         @Override
  84         protected Control createDialogArea(Composite parent) {
  85                 Composite dialogarea = (Composite) super.createDialogArea(parent);
  86                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  87                 Composite composite = new Composite(dialogarea, SWT.NONE);
  88                 composite.setLayout(new GridLayout(2, false));
  89                 composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  90
  91                 setMessage(message != null ? message
  92                                 + (exception != null ? ": " + exception.getMessage() : "")
  93                                 : exception != null ? exception.getMessage() : "Unkown Error",
  94                                 IMessageProvider.ERROR);
  95
  96                 if (exception != null) {
  97                         Text stack = new Text(composite, SWT.MULTI | SWT.LEAD | SWT.BORDER
  98                                         | SWT.V_SCROLL | SWT.H_SCROLL);
  99                         stack.setEditable(false);
 100                         stack.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 101                         StringWriter sw = new StringWriter();
 102                         exception.printStackTrace(new PrintWriter(sw));
 103                         stack.setText(sw.toString());
 104                 }
 105
 106                 parent.pack();
 107                 return composite;
 108         }
 109
 110         protected void configureShell(Shell shell) {
 111                 super.configureShell(shell);
 112                 shell.setText("Error");
 113         }
 114 }