dxexception.java

用Java写的面相对象的数据库管理系统

// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by ozone-db.org.
//
// The original code and portions created by SMB are
// Copyright (C) 1997-2000 by SMB GmbH. All rights reserved.
//
// $Id: DxException.java,v 1.6 2000/10/28 16:55:14 daniela Exp $

package org.ozoneDB.DxLib;

import java.lang.reflect.*;
import java.io.*;

/**
 * Diese Klasse dient dazu, ein Java-Exception in einem Stream zu schreiben
 * bzw. daraus zu lesen. Das ist z.B. fuer Socket-Verbindungen nuetzlich.
 * 
 * 
 * @author <a href="http://www.softwarebuero.de/">SMB</a>
 * @version $Revision: 1.6 $Date: 2000/10/28 16:55:14 $
 */
public class DxException extends DxObject implements Externalizable {
    
    final static long serialVersionUID = 1L;
    
    Throwable exc;
    String msg;
    
    
    public DxException() {
        msg = new String();
    }
    
    
    public DxException( Throwable e ) {
        exc = e;
        msg = new String( e.toString() );
    }
    
    
    public Throwable toExc() {
        return exc;
    } 
    
    
    public String toString() {
        return msg;
    } 
    
    
    public void writeExternal( ObjectOutput out ) throws IOException {
        try {
            if (exc != null) {
                out.writeUTF( exc.getClass().getName() );
            } else {
                out.writeUTF( "null" );
            } 
            out.writeUTF( msg );
        } catch (Exception e) {
            throw new IOException( e.toString() );
        } 
    } 
    
    
    public void readExternal( ObjectInput in ) throws IOException {
        try {
            String e = in.readUTF();
            msg = in.readUTF();
            if (e.compareTo( "null" ) != 0) {
                Class[] classes = new Class[1];
                classes[0] = e.getClass();
                Constructor constr = Class.forName( e ).getConstructor( classes );
                if (constr != null) {
                    Object[] args = new Object[1];
                    args[0] = msg;
                    System.out.println( args[0] );
                    exc = (Throwable)constr.newInstance( args );
                } 
            } 
        } catch (Exception e) {
            throw new IOException( e.toString() );
        } 
    } 
}