stdoutgraphqueryresultwriter.java

这是外国一个开源推理机

/*  Sesame - Storage and Querying architecture for RDF and RDF Schema
 *  Copyright (C) 2001-2005 Aduna
 *
 *  Contact: 
 *  	Aduna
 *  	Prinses Julianaplein 14 b
 *  	3817 CS Amersfoort
 *  	The Netherlands
 *  	tel. [phone]
 *  	fax. [phone]
 *
 *  	http://aduna.biz/
 *  	http://www.openrdf.org/
 *  
 *  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 2.1 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
 */

package org.openrdf.sesame.query;

import java.io.IOException;

import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.Value;

/**
 * <p>
 * A default implementation of GraphQueryResultListener that simply writes
 * all results to System.out. Useful for debugging purposes.
 * </p>
 *
 * @author Jeen Broekstra
 * @version $Revision: 1.5 $
 *
 **/
public class StdOutGraphQueryResultWriter implements GraphQueryResultListener {

	public void startGraphQueryResult()
		throws IOException 
	{
		System.out.println("[start of graph]");
	}

	public void endGraphQueryResult()
		throws IOException
	{
		System.out.println("[end of graph]");
	}

	public void namespace(String prefix, String name)
		throws IOException 
	{
		System.out.println("* namespace " + prefix + ": " + name);	
	}

	public void triple(Resource subj, URI pred, Value obj)
		throws IOException 
	{
		System.out.println(" - triple(" + subj.toString() + ", " + pred.toString() + ", " + obj.toString() + ")");
	}

	public void reportError(String msg)
		throws IOException
	{
		System.out.println("[ERROR] " + msg);
	}
}