de.thischwa.pmcms.tool.file.FileComparator.java Source code

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Here is the source code for de.thischwa.pmcms.tool.file.FileComparator.java

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/*******************************************************************************
 * Poor Man's CMS (pmcms) - A very basic CMS generating static html pages.
 * http://poormans.sourceforge.net
 * Copyright (C) 2004-2013 by Thilo Schwarz
 * 
 * == BEGIN LICENSE ==
 * 
 * Licensed under the terms of any of the following licenses at your
 * choice:
 * 
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 * 
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 * 
 * == END LICENSE ==
 ******************************************************************************/
package de.thischwa.pmcms.tool.file;

import java.io.File;
import java.util.Comparator;

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.StringUtils;

/**
 * Comparator for generating a traverseable file list e.g. to reduce change directory commands while copying. 
 * The sort order is 1st the full path of the directory and 2nd the name of the file.
 *
 * @author Thilo Schwarz
 */
public class FileComparator implements Comparator<File> {

    @Override
    public int compare(final File f1, final File f2) {
        if (f1.getAbsolutePath().equals(f2.getAbsolutePath()))
            return 0;

        String path1 = FilenameUtils.getFullPath(f1.getAbsolutePath());
        String path2 = FilenameUtils.getFullPath(f2.getAbsolutePath());
        String name1 = FilenameUtils.getName(f1.getAbsolutePath());
        String name2 = FilenameUtils.getName(f2.getAbsolutePath());
        if (path1.equals(path2) || (StringUtils.isBlank(path1) && StringUtils.isBlank(path2)))
            return name1.compareTo(name2);
        String[] pathParts1 = StringUtils.split(FilenameUtils.getFullPathNoEndSeparator(path1), File.separatorChar);
        String[] pathParts2 = StringUtils.split(FilenameUtils.getFullPathNoEndSeparator(path2), File.separatorChar);

        if (pathParts1.length < pathParts2.length)
            return -1;
        if (pathParts1.length > pathParts2.length)
            return +1;

        int i = 0;
        while (i < pathParts1.length && i < pathParts2.length) {
            if (!pathParts1[i].equals(pathParts2[i]))
                return pathParts1[i].compareTo(pathParts2[i]);
            i++;
        }
        return 0;
    }
}