/*
* Open Source Physics software is free software as described near the bottom of this code file.
*
* For additional information and documentation on Open Source Physics please see:
* <http://www.opensourcephysics.org/>
*/
package org.opensourcephysics.controls;
import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
/**
* This is an ObjectLoader implementation that uses the Java XMLEncoder and
* XMLDecoder classes to save and load data.
*
* @author Douglas Brown
* @version 1.0
*/
public class XMLJavaLoader implements XML.ObjectLoader {
private ByteArrayOutputStream out;
private BufferedOutputStream buf;
/**
* Constructs the loader.
*/
public XMLJavaLoader() {
out = new ByteArrayOutputStream();
buf = new BufferedOutputStream(out);
}
/**
* Saves XMLEncoder data for an object in the specified XMLControl.
*
* @param control the control
* @param obj the object
*/
public void saveObject(XMLControl control, Object obj) {
// buf.flush();
XMLEncoder enc = new XMLEncoder(buf);
enc.writeObject(obj);
enc.close();
String xml = out.toString();
control.setValue("java_xml", xml); //$NON-NLS-1$
}
/**
* Creates a new object if the class type has a no-arg constructor.
*
* @param control the control
* @return the new object
*/
public Object createObject(XMLControl control) {
String xml = control.getString("java_xml"); //$NON-NLS-1$
InputStream in;
try {
in = new ByteArrayInputStream(xml.getBytes("UTF-8")); //$NON-NLS-1$
} catch(UnsupportedEncodingException ex) {
in = new ByteArrayInputStream(xml.getBytes());
}
XMLDecoder dec = new XMLDecoder(new BufferedInputStream(in));
Object obj = dec.readObject();
dec.close();
return obj;
}
/**
* Loads an object with data from an XMLControl.
*
* @param control the control
* @param obj the object
*/
public Object loadObject(XMLControl control, Object obj) {
return createObject(control);
}
}
/*
* Open Source Physics software is free software; you can redistribute
* it and/or modify it under the terms of the GNU General Public License (GPL) as
* published by the Free Software Foundation; either version 2 of the License,
* or(at your option) any later version.
* Code that uses any portion of the code in the org.opensourcephysics package
* or any subpackage (subdirectory) of this package must must also be be released
* under the GNU GPL license.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA
* or view the license online at http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2007 The Open Source Physics project
* http://www.opensourcephysics.org
*/