/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow;import java.io.PrintStream;import java.io.PrintWriter;/** * @author Hani Suleiman (hani@formicary.net) * Date: May 10, 2003 * Time: 11:26:07 AM */public class WorkflowException extends Exception {    //~ Instance fields ////////////////////////////////////////////////////////    private Throwable rootCause;    //~ Constructors ///////////////////////////////////////////////////////////    public WorkflowException() {    }    public WorkflowException(String s) {        super(s);    }    public WorkflowException(String s, Throwable rootCause) {        super(s);        this.rootCause = rootCause;    }    public WorkflowException(Throwable rootCause) {        this.rootCause = rootCause;    }    //~ Methods ////////////////////////////////////////////////////////////////    public Throwable getCause() {        return rootCause;    }    public String getMessage() {        StringBuffer sb = new StringBuffer();        String msg = super.getMessage();        if (msg != null) {            sb.append(msg);            if (rootCause != null) {                sb.append(": ");            }        }        if (rootCause != null) {            sb.append("root cause: " + ((rootCause.getMessage() == null) ? rootCause.toString() : rootCause.getMessage()));        }        return sb.toString();    }    public Throwable getRootCause() {        return rootCause;    }    public void printStackTrace() {        super.printStackTrace();        if (rootCause != null) {            synchronized (System.err) {                System.err.println("\nRoot cause:");                rootCause.printStackTrace();            }        }    }    public void printStackTrace(PrintStream s) {        super.printStackTrace(s);        if (rootCause != null) {            synchronized (s) {                s.println("\nRoot cause:");                rootCause.printStackTrace(s);            }        }    }    public void printStackTrace(PrintWriter s) {        super.printStackTrace(s);        if (rootCause != null) {            synchronized (s) {                s.println("\nRoot cause:");                rootCause.printStackTrace(s);            }        }    }}