Extract the message from an exception - Java java.lang

Java examples for java.lang:Throwable

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Description

Extract the message from an exception

Demo Code

/*/*from   w ww  . java  2  s.  c om*/
 * This file is part of the OpenSCADA project
 * 
 * Copyright (C) 2006-2012 TH4 SYSTEMS GmbH (http://th4-systems.com)
 * Copyright (C) 2013 Jens Reimann (ctron@dentrassi.de)
 *
 * OpenSCADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenSCADA 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenSCADA. If not, see
 * <http://opensource.org/licenses/lgpl-3.0.html> for a copy of the LGPLv3 License.
 */
//package com.java2s;

public class Main {
    /**
     * Extract the message from an exception
     * 
     * @param e
     *            the exception to extract the message from
     * @return either the localized message, the message or the class name (in
     *         that order)
     */
    public static String extractMessage(final Throwable e) {
        if (e == null) {
            return null;
        }

        if (e.getLocalizedMessage() != null) {
            return e.getLocalizedMessage();
        } else if (e.getMessage() != null) {
            return e.getMessage();
        } else {
            return e.getClass().getName();
        }
    }

    /**
     * Get the message of the root cause
     * 
     * @param e
     *            the exception from which the message should be extracted
     * @return the message of the root cause
     * @see StatusHelper#extractMessage(Throwable)
     */
    public static String getMessage(final Throwable e) {
        return extractMessage(getRootCause(e));
    }

    /**
     * Get the root cause of an exception
     * 
     * @param e
     *            the exception to check, must not be <code>null</code>
     * @return the root cause, is never <code>null</code>
     */
    public static Throwable getRootCause(Throwable e) {
        if (e == null) {
            return null;
        }

        while (e.getCause() != null) {
            e = e.getCause();
        }
        return e;
    }
}

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