/* * AppleCommander - An Apple ][ image utility. * Copyright (C) 2002 by Robert Greene * robgreene at users.sourceforge.net * * 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 com.webcodepro.applecommander.storage; import java.util.Comparator; /** * Sort FileEntry objects by the columnIndex. Mostly useful to the interface. * The columns are tested to see if they are numerical - if so, an Integer compare * is done (instead of a String). *
* Date created: Oct 27, 2002 8:24:39 PM
* @author: Rob Greene
*/
public class FileEntryComparator implements Comparator {
private int columnIndex;
private int displayMode;
/**
* Construct a FileEntryComparator for the given columnIndex.
*/
public FileEntryComparator(int columnIndex, int displayMode) {
this.columnIndex = columnIndex;
this.displayMode = displayMode;
}
/**
* Compare two FileEntry objects.
* @see java.util.Comparator#compare(Object, Object)
*/
public int compare(Object o1, Object o2) {
if (!(o1 instanceof FileEntry) || !(o2 instanceof FileEntry)) {
return 0;
}
if (o1 == null || o2 == null) {
return ((o1 == null) ? -1 : 0) + ((o2 == null) ? 1 : 0);
}
FileEntry entry1 = (FileEntry) o1;
FileEntry entry2 = (FileEntry) o2;
String column1 = (String) entry1.getFileColumnData(displayMode).get(columnIndex);
String column2 = (String) entry2.getFileColumnData(displayMode).get(columnIndex);
if (isAllDigits(column1) && isAllDigits(column2)) {
int int1 = toInt(column1);
int int2 = toInt(column2);
return int1 - int2;
} else {
return column1.compareTo(column2);
}
}
/**
* Test for digits in the screen.
*/
protected boolean isAllDigits(String string) {
if (string == null || string.length() == 0) return false;
for (int i=0; i