xfilecomparator.java

来自「JavaExplorer是一个独立于平台的浏览器」· Java 代码 · 共 156 行

/**
  * File and FTP Explorer
  * Copyright 2002
  * BOESCH Vincent
  *
  * This program 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 2
  * of the License, or (at your option) any later version.
  *
  * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
package javaexplorer.util.comparator;

import java.util.*;

import javaexplorer.model.XFile;


public class XFileComparator implements Comparator {
    private static XFileComparator _fileComparator = new XFileComparator();
    public static final int SORT_NAME = 0;
    public static final int SORT_SIZE = 1;
    public static final int SORT_DATE = 2;
    private int _intSortType = 0; //Par defaut, sort sur le nom
    boolean reverse = false;

    /**
     *  Constructor for the FileComparator
     *  object
     */
    public XFileComparator() {
    }

    //Comparaison de deux fichiers

    /**
     *  Description of the Method
     *
     *@param  obj1  Description of Parameter
     *@param  obj2  Description of Parameter
     *@return       Description of the Returned
     *      Value
     */
    public int compare(Object obj1, Object obj2) {
        //Objet null plus petit qu'un objet non null
        if (obj1 == null) {
            if (obj2 == null) {
                return 0;
            } else {
                return 1;
            }
        } else {
            if (obj2 == null) {
                return -1;
            } else {
                XFile f1 = (XFile) obj1;
                XFile f2 = (XFile) obj2;

                return compare(f1, f2, _intSortType);
            }
        }
    }

    /**
     * Comparaison de deux xfile non-nuls !!!
     */
    private int compare(XFile x1, XFile x2, int method) {
        switch (method) {
        case SORT_SIZE:

            if (x1.length() == x2.length()) {
                return compare(x1, x2, SORT_NAME);
            } else {
                return (x1.length() > x2.length()) ? (reverse ? (-1) : 1)
                                                   : (reverse ? 1 : (-1));
            }

        case SORT_DATE:

            if (x1.lastModified() == x2.lastModified()) {
                return compare(x1, x2, SORT_NAME);
            } else {
                return (x1.lastModified() > x2.lastModified())
                ? (reverse ? (-1) : 1) : (reverse ? 1 : (-1));
            }

        case SORT_NAME:default:

            if (x1.isDirectory()) {
                if (!x2.isDirectory()) {
                    return (reverse ? 1 : (-1));
                }
            } else {
                if (x2.isDirectory()) {
                    return (reverse ? (-1) : 1);
                }
            }

            int res = x1.toString().compareToIgnoreCase(x2.toString());

            //Si pareil en ignoreCase, on regarde si les noms sont diff
            if (res == 0) {
                res = x1.toString().compareTo(x2.toString());
            }

            return reverse ? (-res) : res;
        }
    }

    //2 fichiers egaux ?

    /**
     *  Description of the Method
     *
     *@param  obj1  Description of Parameter
     *@param  obj2  Description of Parameter
     *@return       Description of the Returned
     *      Value
     */
    public boolean equals(Object obj1, Object obj2) {
        return compare(obj1, obj2) == 0;
    }

    public void setSortMethod(int sortType) {
        if (sortType == _intSortType) {
            reverse = !reverse;
        } else {
            reverse = false;
        }

        _intSortType = sortType;
    }

    public int getSortMethod() {
        return _intSortType;
    }

    /**
     *  Gets the Comparator attribute of the
     *  FileComparator class
     *
     *@return    The Comparator value
     */
    public static XFileComparator getComparator() {
        return _fileComparator;
    }
}