001/**
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014package ch.qos.logback.core.rolling.helper;
015
016import java.io.File;
017import java.nio.file.FileStore;
018import java.nio.file.Files;
019import java.nio.file.Path;
020
021import ch.qos.logback.core.rolling.RolloverFailure;
022
023/**
024 * A utility class using functionality available since JDK 1.7.
025 *
026 * @author ceki
027 * @since 1.0.10
028 */
029public class FileStoreUtil {
030
031    static final String PATH_CLASS_STR = "java.nio.file.Path";
032    static final String FILES_CLASS_STR = "java.nio.file.Files";
033
034    /**
035     * This method assumes that both files a and b exists.
036     *
037     * @param a
038     * @param b
039     * @return
040     * @throws RolloverFailure
041     */
042    static public boolean areOnSameFileStore(File a, File b) throws RolloverFailure {
043        if (!a.exists()) {
044            throw new IllegalArgumentException("File [" + a + "] does not exist.");
045        }
046        if (!b.exists()) {
047            throw new IllegalArgumentException("File [" + b + "] does not exist.");
048        }
049
050        // Implements the following by reflection
051
052        try {
053            Path pathA = a.toPath();
054            Path pathB = b.toPath();
055
056            FileStore fileStoreA = Files.getFileStore(pathA);
057            FileStore fileStoreB = Files.getFileStore(pathB);
058
059            return fileStoreA.equals(fileStoreB);
060        } catch (Exception e) {
061            throw new RolloverFailure("Failed to check file store equality for [" + a + "] and [" + b + "]", e);
062        }
063    }
064}