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/**
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* '$RCSfile$'
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* Purpose: An Exception thrown when an error occurs because a
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* problem occurred in the metacat database
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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*
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* '$Author: leinfelder $'
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* '$Date: 2010-12-21 14:26:06 -0800 (Tue, 21 Dec 2010) $'
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* '$Revision: 5752 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.io.Writer;
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/**
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* Exception thrown when an error occurs because a problem occurred in
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* the metacat database. This is the general type of Exception that is
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* thrown whenever the server encounters an Error or Exception that is
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* outside of the scope of normal operation. This class may be
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* subclassed to provide more detailed informatin about the error.
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*/
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public class McdbException extends Exception {
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/**
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* @serial The embedded exception if wrapping an Exception
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*/
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private Exception exception;
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/**
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* Create a new McdbException.
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*/
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public McdbException() {
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super();
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this.exception = null;
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}
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/**
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* Create a new McdbException.
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*
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* @param message The error or warning message.
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*/
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public McdbException(String message) {
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super(message);
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this.exception = null;
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}
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/**
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* Create a new McdbException.
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*
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* @param e The exception to tunnel inside this exception
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*/
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public McdbException(Exception e) {
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super();
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this.exception = e;
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}
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/**
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* Create a new McdbException.
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*
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* @param message The error or warning message.
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* @param e The exception to tunnel inside this exception
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*/
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public McdbException(String message, Exception e) {
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super(message);
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this.exception = e;
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}
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/**
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* Get the tunneled Exception
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*/
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public Exception getException() {
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return exception;
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}
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/**
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* Get the message from this exception.
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*
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* <p>This returns the message from this exception, but if it
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* is null, and if the tunnelled exception is not null, then
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* it returns the message fromthe tunnelled exception.
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*/
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public String getMessage() {
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String msg = super.getMessage();
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if (msg == null && exception != null) {
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return exception.getMessage();
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}
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return msg;
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}
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/**
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* Print the message from this exception in XML format.
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*
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* <p>This returns the message from this exception, but if it
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* is null, and if the tunnelled exception is not null, then
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* it returns the message from the tunnelled exception.
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*/
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public void toXml(Writer pw) {
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String msg = super.getMessage();
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if (msg == null && exception != null) {
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msg = exception.getMessage();
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}
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try {
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pw.write("<?xml version=\"1.0\"?>");
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pw.write("<error>" + msg + "</error>");
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pw.flush();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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