001    /* ============================================================
002     * JRobin : Pure java implementation of RRDTool's functionality
003     * ============================================================
004     *
005     * Project Info:  http://www.jrobin.org
006     * Project Lead:  Sasa Markovic (saxon@jrobin.org);
007     *
008     * (C) Copyright 2003-2005, by Sasa Markovic.
009     *
010     * Developers:    Sasa Markovic (saxon@jrobin.org)
011     *
012     *
013     * This library is free software; you can redistribute it and/or modify it under the terms
014     * of the GNU Lesser General Public License as published by the Free Software Foundation;
015     * either version 2.1 of the License, or (at your option) any later version.
016     *
017     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
018     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
019     * See the GNU Lesser General Public License for more details.
020     *
021     * You should have received a copy of the GNU Lesser General Public License along with this
022     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
023     * Boston, MA 02111-1307, USA.
024     */
025    
026    package org.jrobin.core;
027    
028    import java.io.IOException;
029    
030    /**
031     * Factory class which creates actual {@link RrdFileBackend} objects. This was the default
032     * backend factory in JRobin before 1.4.0 release.
033     */
034    public class RrdFileBackendFactory extends RrdBackendFactory {
035            /**
036             * factory name, "FILE"
037             */
038            public static final String NAME = "FILE";
039    
040            /**
041             * Creates RrdFileBackend object for the given file path.
042             *
043             * @param path   File path
044             * @param readOnly True, if the file should be accessed in read/only mode.
045             *                 False otherwise.
046             * @return RrdFileBackend object which handles all I/O operations for the given file path
047             * @throws IOException Thrown in case of I/O error.
048             */
049            protected RrdBackend open(String path, boolean readOnly) throws IOException {
050                    return new RrdFileBackend(path, readOnly);
051            }
052    
053            /**
054             * Method to determine if a file with the given path already exists.
055             *
056             * @param path File path
057             * @return True, if such file exists, false otherwise.
058             */
059            protected boolean exists(String path) {
060                    return Util.fileExists(path);
061            }
062    
063            /**
064             * Returns the name of this factory.
065             *
066             * @return Factory name (equals to string "FILE")
067             */
068            public String getFactoryName() {
069                    return NAME;
070            }
071    }