org.argeo.eclipse.ui.workbench/src/org/argeo/eclipse/ui/workbench/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.workbench;
  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 static final long serialVersionUID = -8918084784628179044L;
  39
  40         private final static Log log = LogFactory.getLog(ErrorFeedback.class);
  41
  42         private final String message;
  43         private final Throwable exception;
  44
  45         public static void show(String message, Throwable e) {
  46                 // rethrow ThreaDeath in order to make sure that RAP will properly clean
  47                 // up the UI thread
  48                 if (e instanceof ThreadDeath)
  49                         throw (ThreadDeath) e;
  50
  51                 new ErrorFeedback(getDisplay().getActiveShell(), message, e).open();
  52         }
  53
  54         public static void show(String message) {
  55                 new ErrorFeedback(getDisplay().getActiveShell(), message, null).open();
  56         }
  57
  58         /** Tries to find a display */
  59         private static Display getDisplay() {
  60                 try {
  61                         Display display = PlatformUI.getWorkbench().getDisplay();
  62                         if (display != null)
  63                                 return display;
  64                         else
  65                                 return Display.getDefault();
  66                 } catch (Exception e) {
  67                         return Display.getCurrent();
  68                 }
  69         }
  70
  71         public ErrorFeedback(Shell parentShell, String message, Throwable e) {
  72                 super(parentShell);
  73                 this.message = message;
  74                 this.exception = e;
  75                 log.error(message, e);
  76         }
  77
  78         protected Point getInitialSize() {
  79                 if (exception != null)
  80                         return new Point(800, 600);
  81                 else
  82                         return new Point(400, 300);
  83         }
  84
  85         @Override
  86         protected Control createDialogArea(Composite parent) {
  87                 Composite dialogarea = (Composite) super.createDialogArea(parent);
  88                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  89                 Composite composite = new Composite(dialogarea, SWT.NONE);
  90                 composite.setLayout(new GridLayout(2, false));
  91                 composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  92
  93                 setMessage(message != null ? message
  94                                 + (exception != null ? ": " + exception.getMessage() : "")
  95                                 : exception != null ? exception.getMessage() : "Unkown Error",
  96                                 IMessageProvider.ERROR);
  97
  98                 if (exception != null) {
  99                         Text stack = new Text(composite, SWT.MULTI | SWT.LEAD | SWT.BORDER
 100                                         | SWT.V_SCROLL | SWT.H_SCROLL);
 101                         stack.setEditable(false);
 102                         stack.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 103                         StringWriter sw = new StringWriter();
 104                         exception.printStackTrace(new PrintWriter(sw));
 105                         stack.setText(sw.toString());
 106                 }
 107
 108                 parent.pack();
 109                 return composite;
 110         }
 111
 112         protected void configureShell(Shell shell) {
 113                 super.configureShell(shell);
 114                 shell.setText("Error");
 115         }
 116 }