dbxmlforobj.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 Core 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: DbXMLForObj.java,v 1.3 2000/10/28 16:55:17 daniela Exp $

package org.ozoneDB.core.DbRemote;

import java.io.*;
import org.ozoneDB.DxLib.*;
import org.ozoneDB.core.*;
import org.ozoneDB.core.xml.*;
import org.ozoneDB.*;
import org.ozoneDB.util.*;
import org.ozoneDB.xml.util.*;


/**
 * @author <a href="http://www.softwarebuero.de/">SMB</a>
 * @version $Revision: 1.3 $Date: 2000/10/28 16:55:17 $
 */
public final class DbXMLForObj extends DbCommand {
    
    private OzoneProxy obj;
    
    
    public DbXMLForObj() {
    }
    
    
    public DbXMLForObj( OzoneProxy _obj ) {
        obj = _obj;
    }
    
    
    public void perform( Transaction ta ) throws Exception {
        // env.logWriter.newEntry (this, "DbXMLForObj.perform()...", LogWriter.DEBUG);
        
        ObjectContainer container = ta.acquireObject( obj.remoteID(), Lock.LEVEL_READ );
        
        // cache already converted XML in the container?
        
        OzoneCompatible target = container.target();
        SAXChunkProducer chunkProducer = new SAXChunkProducer( (SAXChunkProducerDelegate)null );
        Object2XML o2x = new Object2XML( chunkProducer, true );
        o2x.toXML( target );
        ChunkOutputStream cos = chunkProducer.chunkStream();
        result = cos.toByteArray();
    } 
    
    
    public void writeExternal( ObjectOutput out ) throws IOException {
        out.writeObject( obj );
    } 
    
    
    public void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException {
        obj = (OzoneProxy)in.readObject();
    } 
    
    
    public String toString() {
        return super.toString();
    } 
    
}