ftpcomparator.java

来自「JavaExplorer是一个独立于平台的浏览器」· Java 代码 · 共 113 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.util.ftp.*;


public class FtpComparator implements Comparator {
    private static FtpComparator _comparator = new FtpComparator();

    /**
     *  Constructor for the FileComparator
     *  object
     */
    private FtpComparator() {
    }

    //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 {
                Ftp f1 = (Ftp) obj1;
                Ftp f2 = (Ftp) obj2;

                if (f1 instanceof FtpContainer) {
                    if (!(f2 instanceof FtpContainer)) {
                        return -1;
                    }
                } else {
                    if (f2 instanceof FtpContainer) {
                        return 1;
                    }
                }

                return f1.getTitle().compareToIgnoreCase(f2.getTitle());
            }
        }
    }

    //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) {
        if (obj1 == null) {
            if (obj2 == null) {
                return true;
            }

            return false;
        } else {
            if (obj2 == null) {
                return false;
            }

            return obj1.equals(obj2);
        }
    }

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