cvs commit: jakarta-avalon/src/java/org/apache/avalon ExceptionUtil.java

[donaldp]

donaldp     01/04/18 06:04:13

  Added:       src/java/org/apache/avalon ExceptionUtil.java
  Log:
  Added new exception utility class.
  
  Revision  Changes    Path
  1.1                  jakarta-avalon/src/java/org/apache/avalon/ExceptionUtil.java
  
  Index: ExceptionUtil.java
  ===================================================================
  /*
   * Copyright (C) The Apache Software Foundation. All rights reserved.
   *
   * This software is published under the terms of the Apache Software License
   * version 1.1, a copy of which has been included with this distribution in
   * the LICENSE file.
   */
  package org.apache.avalon;
  
  import java.io.PrintWriter;
  import java.io.StringWriter;
  import java.util.ArrayList;
  import java.util.StringTokenizer;
  
  /**
   * This class provides basic facilities for manipulating exceptions.
   *
   * Some exception handling stuff thieved from Turbine...
   *
   * @author <a href="mailto:[EMAIL PROTECTED]">Peter Donald</a>
   * @author <a href="mailto:[EMAIL PROTECTED]">Rafal Krzewski</a>
   */
  public final class ExceptionUtil
  {
      /**
       * Private constructor to prevent instantiation.
       */
      private ExceptionUtil()
      {
      }
  
      public static String printStackTrace( final Throwable throwable )
      {
          return printStackTrace( throwable, 0, true );
      }
  
      public static String printStackTrace( final Throwable throwable,
                                            final boolean printCascading )
      {
          return printStackTrace( throwable, 0, printCascading );
      }
  
      public static String printStackTrace( final Throwable throwable, int depth )
      {
          final String[] lines = captureStackTrace( throwable );
  
          if( 0 == depth || depth > lines.length ) depth = lines.length;
  
          final StringBuffer sb = new StringBuffer();
  
          for( int i = 0; i < depth; i++ )
          {
              sb.append( lines[ i ] );
              sb.append( '\n' );
          }
  
          return sb.toString();
      }
  
      public static String printStackTrace( Throwable throwable,
                                            final int depth,
                                            final boolean printCascading )
      {
          final String result = printStackTrace( throwable, depth );
  
          if( !printCascading || !(throwable instanceof CascadingThrowable) )
          {
              return result;
          }
          else
          {
              final StringBuffer sb = new StringBuffer();
              sb.append( result );
  
              throwable = ((CascadingThrowable)throwable).getCause();
  
              while( null != throwable )
              {
                  sb.append( "rethrown from\n" );
                  sb.append( printStackTrace( throwable, depth ) );
  
                  if( throwable instanceof CascadingThrowable )
                  {
                      throwable = ((CascadingThrowable)throwable).getCause();
                  }
                  else
                  {
                      throwable = null;
                  }
              }
  
              return sb.toString();
          }
      }
  
      /**
       * Captures the stack trace associated with this exception.
       *
       * @return an array of Strings describing stack frames.
       */
      public static String[] captureStackTrace( final Throwable throwable )
      {
          final StringWriter sw = new StringWriter();
          throwable.printStackTrace( new PrintWriter( sw, true ) );
          return splitString( sw.toString(), "\n" );
      }
  
      /**
       * Splits the string on every token into an array of stack frames.
       *
       * @param string the string
       * @param onToken the token
       * @return the resultant array
       */
      public static String[] splitString( final String string, final String onToken )
      {
          final StringTokenizer tokenizer = new StringTokenizer( string, onToken );
  
          final ArrayList lines = new ArrayList();
  
          while( tokenizer.hasMoreTokens() )
          {
              lines.add( tokenizer.nextToken() );
          }
  
          return (String[])lines.toArray( new String[ 0 ] );
      }
  }
  
  
  

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