com.webcodepro.applecommander.storage.FileEntryComparator Maven / Gradle / Ivy
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/*
* AppleCommander - An Apple ][ image utility.
* Copyright (C) 2002-2022 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(FileEntry entry1, FileEntry entry2) {
if (entry1 == null || entry2 == null) {
return ((entry1 == null) ? -1 : 0) + ((entry2 == null) ? 1 : 0);
}
String column1 = entry1.getFileColumnData(displayMode).get(columnIndex);
String column2 = entry2.getFileColumnData(displayMode).get(columnIndex);
if (isAllDigits(column1) && isAllDigits(column2)) {
int int1 = toInt(column1);
int int2 = toInt(column2);
return int1 - int2;
}
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