xmlserializationops.java

Mandarax是一个规则引擎的纯Java实现。它支持多类型的事实和基于反映的规则

package org.mandarax.zkb;
/*
 * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;

import org.mandarax.util.xmlser.LogExceptionListener;
 
/**
 * Object persistency service based on XML serialization.
 * <strong>Warning:</strong>Requires JDK 1.4 or better!
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 2.2
 */
public class XMLSerializationOPS extends AbstractOPS {
	/**
	 * Export objects.
	 * @param out an output stream
	 * @exception an io exception
	 */
	public void exportObjects(OutputStream out) throws IOException {
		XMLEncoder encoder = new XMLEncoder(out);
		encoder.setExceptionListener(new LogExceptionListener());
       	encoder.writeObject(objectsByUri);
       	encoder.close();
	}
	/**
	 * Import objects.
	 * @param in an input stream
	 * @exception an io exception
	 */
	public void importObjects(InputStream in) throws IOException {
		// buffer, otherwise closing the decoder closes the stream
		ByteArrayOutputStream buf = new ByteArrayOutputStream();
		byte b = -1;
		while ((b=(byte)in.read())>-1) buf.write(b);
		InputStream bin = new ByteArrayInputStream(buf.toByteArray());
		XMLDecoder decoder = new XMLDecoder(bin);
		decoder.setExceptionListener(new LogExceptionListener());
		reset();
       	objectsByUri = (Map)decoder.readObject();
       	reverseMap(objectsByUri,urisByObject);
       	decoder.close();

	}	
	/**
	 * Get name.
	 * @return the name of the service
	 */
	public String getName() {
		return "XML serialization";
	}
	/**
	 * Get a brief description.
	 * @return a brief description of the service
	 */
	public String getDescription() {
		return "Object persistency service based on JDK XML serialization, requires JDK 1.4 or better";
	}
	/**
	 * Get the extension of the associated files.
	 * @return a file extension
	 */
	public String getExtension() {
		return "xml";
	}
}