/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.commons.utils;

/**
 * Jul 8, 2004
 * 
 * @author: Tuan Nguyen
 * @version: $Id: ExceptionUtil.java,v 1.2 2004/10/05 14:40:47 tuan08 Exp $
 */
public class ExceptionUtil
{
   private static String LINE_SEPARATOR = PrivilegedSystemHelper.getProperty("line.separator");

   static public String getExoStackTrace(Throwable t)
   {
      StackTraceElement[] elements = t.getStackTrace();
      StringBuffer b = new StringBuffer();
      b.append(t.getMessage()).append(LINE_SEPARATOR);
      boolean appendDot = true;
      for (int i = 0; i < elements.length; i++)
      {
         if (i < 10)
         {
            b.append(" at ").append(elements[i].toString()).append(LINE_SEPARATOR);
         }
         else
         {
            if (elements[i].getClassName().startsWith("exo."))
            {
               b.append(" at ").append(elements[i].toString()).append(LINE_SEPARATOR);
               appendDot = true;
            }
            else
            {
               if (appendDot)
               {
                  b.append("  [...................................]").append(LINE_SEPARATOR);
                  appendDot = false;
               }
            }
         }
      }
      return b.toString();
   }

   static public String getStackTrace(Throwable t, int numberOfLine)
   {
      StackTraceElement[] elements = t.getStackTrace();
      if (numberOfLine > elements.length)
         numberOfLine = elements.length;
      StringBuffer b = new StringBuffer();
      b.append(t.getMessage()).append(LINE_SEPARATOR);
      for (int i = 0; i < numberOfLine; i++)
      {
         b.append(elements[i].toString()).append(LINE_SEPARATOR);
      }
      return b.toString();
   }

   static public Throwable getRootCause(Throwable t)
   {
      Throwable root = t;
      while (root.getCause() != null)
      {
         root = root.getCause();
      }
      return root;
   }
}
