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/*
 * Enhydra Java Application Server Project
 * 
 * The contents of this file are subject to the Enhydra Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License on
 * the Enhydra web site ( http://www.enhydra.org/ ).
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 
 * the License for the specific terms governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Enhydra Application Server is Lutris
 * Technologies, Inc. The Enhydra Application Server and portions created
 * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
 * All Rights Reserved.
 * 
 * Contributor(s):
 * 
 * $Id: ErrorHandling.java,v 1.2 2005/01/26 08:29:24 jkjome Exp $
 */

package org.enhydra.xml.xmlc.commands;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.enhydra.error.ChainedThrowable;
import org.xml.sax.SAXException;

/**
 * Error handling methods for use in commands.
 */
public class ErrorHandling {

    /*
     * Disallow instantiation.
     */
    private ErrorHandling() {
    }

    /*
     * Print out a stack trace with special handling of SAX exceptions.
     */
    private static void printStackTrace(Throwable except) {
        except.printStackTrace();

        // If this is a chained exception, then walk the stack
        // looking for a non-chained exception.
        while ((except != null) && (except instanceof ChainedThrowable)) {
            except = ((ChainedThrowable)except).getCause();
        }
        if ((except != null) && (except instanceof SAXException)) {
            Exception except2 = ((SAXException)except).getException();
            if (except2 != null) {
                printStackTrace(except2);
            }
        }
    }
    
    /*
     * Handle an exception, printing the approriate error
     * message and exit the program
     *
     * @param except Exception or error to print.
     * @param verbose If true, print all details of the error.
     */
    public static void handleException(Throwable except,
                                       boolean verbose) {
        if (except instanceof ChainedThrowable) {
            System.err.println("Error: " + except.getMessage());
            if (verbose) {
                printStackTrace(except);
            }

            // If this is result of a java.lang exception, print stack.
            Throwable cause = ((ChainedThrowable)except).getCause();
            if ((!verbose) && (cause != null)
                && cause.getClass().getName().startsWith("java.lang.")) {
                printStackTrace(cause);
            }
        } else if ((except instanceof FileNotFoundException)
                   || (except instanceof IOException)) {
            System.err.println("Error: " + except.toString());
            if (verbose) {
                printStackTrace(except);
            }
        } else {
            System.err.println("Error: " + except.toString());
            printStackTrace(except);
        }
        System.exit(1);
    }
}