VirtuosoUpdateFactory.java

/*
 *  $Id$
 *
 *  This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
 *  project.
 *
 *  Copyright (C) 1998-2012 OpenLink Software
 *
 *  This project is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; only version 2 of the License, dated June 1991.
 *
 *  This program 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 program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

package virtuoso.jena.driver;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.Reader;

import com.hp.hpl.jena.update.UpdateException;
import com.hp.hpl.jena.util.FileUtils;

public class VirtuosoUpdateFactory {

	private VirtuosoUpdateFactory() {
	}

	/** Create an UpdateRequest by parsing the given string */
	static public VirtuosoUpdateRequest create(String query, VirtGraph graph) {
		return new VirtuosoUpdateRequest(query, graph);
	}

	/** Create an UpdateRequest by reading it from a file */
	public static VirtuosoUpdateRequest read(String fileName, VirtGraph graph) {
		InputStream in = null;
		if (fileName.equals("-"))
			in = System.in;
		else
			try {
				in = new FileInputStream(fileName);
			} catch (FileNotFoundException ex) {
				throw new UpdateException("File nout found: " + fileName);
			}
		return read(in, graph);
	}

	/**
	 * Create an UpdateRequest by reading it from an InputStream (note that
	 * conversion to UTF-8 will be applied automatically)
	 */
	public static VirtuosoUpdateRequest read(InputStream in, VirtGraph graph) {
		Reader r = FileUtils.asBufferedUTF8(in);
		StringBuffer b = new StringBuffer();
		char ch;
		try {
			while ((ch = (char) r.read()) != -1)
				b.append(ch);
		} catch (Exception e) {
			throw new UpdateException(e);
		}
		return new VirtuosoUpdateRequest(b.toString(), graph);
	}

}