org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/dialogs/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.dialogs;
  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
  35 /** Generic error dialog to be used in try/catch blocks */
  36 public class ErrorFeedback extends TitleAreaDialog {
  37         private static final long serialVersionUID = -8918084784628179044L;
  38
  39         private final static Log log = LogFactory.getLog(ErrorFeedback.class);
  40
  41         private final String message;
  42         private final Throwable exception;
  43
  44         public static void show(String message, Throwable e) {
  45                 // rethrow ThreaDeath in order to make sure that RAP will properly clean
  46                 // up the UI thread
  47                 if (e instanceof ThreadDeath)
  48                         throw (ThreadDeath) e;
  49
  50                 new ErrorFeedback(newShell(), message, e).open();
  51         }
  52
  53         public static void show(String message) {
  54                 new ErrorFeedback(newShell(), message, null).open();
  55         }
  56
  57         private static Shell newShell() {
  58                 return new Shell(getDisplay(), SWT.NO_TRIM);
  59         }
  60
  61         /** Tries to find a display */
  62         private static Display getDisplay() {
  63                 try {
  64                         Display display = Display.getCurrent();
  65                         if (display != null)
  66                                 return display;
  67                         else
  68                                 return Display.getDefault();
  69                 } catch (Exception e) {
  70                         return Display.getCurrent();
  71                 }
  72         }
  73
  74         public ErrorFeedback(Shell parentShell, String message, Throwable e) {
  75                 super(parentShell);
  76                 setShellStyle(SWT.NO_TRIM);
  77                 this.message = message;
  78                 this.exception = e;
  79                 log.error(message, e);
  80         }
  81
  82         protected Point getInitialSize() {
  83                 if (exception != null)
  84                         return new Point(800, 600);
  85                 else
  86                         return new Point(400, 300);
  87         }
  88
  89         @Override
  90         protected Control createDialogArea(Composite parent) {
  91                 Composite dialogarea = (Composite) super.createDialogArea(parent);
  92                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  93                 Composite composite = new Composite(dialogarea, SWT.NONE);
  94                 composite.setLayout(new GridLayout(2, false));
  95                 composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  96
  97                 setMessage(message != null ? message + (exception != null ? ": " + exception.getMessage() : "")
  98                                 : exception != null ? exception.getMessage() : "Unkown Error", IMessageProvider.ERROR);
  99
 100                 if (exception != null) {
 101                         Text stack = new Text(composite, SWT.MULTI | SWT.LEAD | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
 102                         stack.setEditable(false);
 103                         stack.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 104                         StringWriter sw = new StringWriter();
 105                         exception.printStackTrace(new PrintWriter(sw));
 106                         stack.setText(sw.toString());
 107                 }
 108
 109                 parent.pack();
 110                 return composite;
 111         }
 112
 113         protected void configureShell(Shell shell) {
 114                 super.configureShell(shell);
 115                 shell.setText("Error");
 116         }
 117 }