1   /*
    2    * Copyright (c) 2002-2007 by OpenSymphony
    3    * All rights reserved.
    4    */
    5   package com.opensymphony.xwork2.interceptor;
    6   
    7   import java.io.IOException;
    8   import java.io.PrintWriter;
    9   import java.io.StringWriter;
   10   import java.io.Serializable;
   11   
   12   /**
   13    * <!-- START SNIPPET: javadoc -->
   14    *
   15    * A simple wrapper around an exception, providing an easy way to print out the stack trace of the exception as well as
   16    * a way to get a handle on the exception itself.
   17    *
   18    * <!-- END SNIPPET: javadoc -->
   19    *
   20    * @author Matthew E. Porter (matthew dot porter at metissian dot com)
   21    */
   22   public class ExceptionHolder implements Serializable {
   23   
   24       private Exception exception;
   25   
   26       /**
   27        * Holds the given exception
   28        *
   29        * @param exception  the exception to hold.
   30        */
   31       public ExceptionHolder(Exception exception) {
   32           this.exception = exception;
   33       }
   34   
   35       /**
   36        * Gets the holded exception
   37        *
   38        * @return  the holded exception
   39        */
   40       public Exception getException() {
   41           return this.exception;
   42       }
   43   
   44       /**
   45        * Gets the holded exception stacktrace using {@link Exception#printStackTrace()}.
   46        *
   47        * @return  stacktrace
   48        */
   49       public String getExceptionStack() {
   50           String exceptionStack = null;
   51   
   52           if (getException() != null) {
   53               StringWriter sw = new StringWriter();
   54               PrintWriter pw = new PrintWriter(sw);
   55   
   56               try {
   57                   getException().printStackTrace(pw);
   58                   exceptionStack = sw.toString();
   59               }
   60               finally {
   61                   try {
   62                       sw.close();
   63                       pw.close();
   64                   } catch (IOException e) {
   65                       // ignore
   66                   }
   67               }
   68           }
   69   
   70           return exceptionStack;
   71       }
   72       
   73   }