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A set of common utilities used within the JBoss PressGang CCMS project

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/*
  Copyright 2011-2014 Red Hat, Inc

  This file is part of PressGang CCMS.

  PressGang CCMS 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 3 of the License, or
  (at your option) any later version.

  PressGang CCMS 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 PressGang CCMS.  If not, see .
*/

package org.jboss.pressgang.ccms.utils.common;

import java.io.PrintWriter;
import java.io.StringWriter;

public class ExceptionUtilities {
    /**
     * A standard function to get the stack trace from a
     * thrown Exception
     *
     * @param ex The thrown exception
     * @return The stack trace from the exception
     */
    public static String getStackTrace(final Throwable ex) {
        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw, true);
        ex.printStackTrace(pw);
        pw.flush();
        sw.flush();
        return sw.toString();
    }

    /**
     * Gets the root cause of an Exception/Error
     *
     * @param throwable The exception/error to find the root cause of.
     * @return The root cause of the exception, or throwable if it is the root cause.
     */
    public static Throwable getRootCause(Throwable throwable) {
        if (throwable.getCause() != null)
            return getRootCause(throwable.getCause());

        return throwable;
    }
}