FileUtil.java

/*
 * This file is part of Fim - File Integrity Manager
 *
 * Copyright (C) 2017  Etienne Vrignaud
 *
 * Fim 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Fim 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 Fim.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fim.util;

import org.fim.model.Context;
import org.fim.model.FileState;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.text.DecimalFormat;

public class FileUtil {
    static DecimalFormat decimalFormat = new DecimalFormat("0.#");

    public static String getNormalizedFileName(Path file) {
        String normalizedFileName = file.toAbsolutePath().normalize().toString();
        if (File.separatorChar != '/') {
            normalizedFileName = normalizedFileName.replace(File.separatorChar, '/');
        }
        return normalizedFileName;
    }

    public static String getRelativeFileName(String directory, String fileName) {
        String relativeFileName = fileName;
        if (relativeFileName.startsWith(directory)) {
            relativeFileName = relativeFileName.substring(directory.length());
        }

        if (relativeFileName.startsWith("/")) {
            relativeFileName = relativeFileName.substring(1);
        }
        return relativeFileName;
    }

    public static boolean removeFile(Context context, Path rootDir, FileState fileState) {
        try {
            Path file = rootDir.resolve(fileState.getFileName());
            Files.delete(file);
            return true;
        } catch (IOException ex) {
            Logger.error("Error deleting file", ex, context.isDisplayStackTrace());
        }
        return false;
    }

    /**
     * Call commons.io.FileUtils.byteCountToDisplaySize() with negative number support.
     */
    public static String byteCountToDisplaySize(final long size) {
        long localSize = size;
        boolean isNegative = false;
        if (size < 0) {
            localSize = -size;
            isNegative = true;
        }

        String displaySize = humanReadableByteCount(localSize, true);
        if (isNegative) {
            displaySize = "-" + displaySize;
        }
        return displaySize;
    }

    /**
     * Original code comes from:
     * http://programming.guide/java/formatting-byte-size-to-human-readable-format.html
     */
    private static String humanReadableByteCount(long bytes, boolean si) {
        int unit = si ? 1000 : 1024;
        if (bytes < unit) {
            return bytes + " bytes";
        }
        int exp = (int) (Math.log(bytes) / Math.log(unit));
        return decimalFormat.format(bytes / Math.pow(unit, exp)) + " " + "KMGTPE".charAt(exp - 1) + (si ? "B" : "bit");
    }
}