92 lines
2.7 KiB
Java
92 lines
2.7 KiB
Java
/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2002-2022 by Robert Greene
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* robgreene at users.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.webcodepro.applecommander.storage;
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import java.util.Comparator;
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/**
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* Sort FileEntry objects by the columnIndex. Mostly useful to the interface.
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* The columns are tested to see if they are numerical - if so, an Integer compare
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* is done (instead of a String).
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* <p>
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* Date created: Oct 27, 2002 8:24:39 PM
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* @author Rob Greene
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*/
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public class FileEntryComparator implements Comparator<FileEntry> {
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private int columnIndex;
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private int displayMode;
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/**
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* Construct a FileEntryComparator for the given columnIndex.
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*/
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public FileEntryComparator(int columnIndex, int displayMode) {
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this.columnIndex = columnIndex;
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this.displayMode = displayMode;
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}
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/**
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* Compare two FileEntry objects.
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* @see java.util.Comparator#compare(Object, Object)
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*/
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public int compare(FileEntry entry1, FileEntry entry2) {
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if (entry1 == null || entry2 == null) {
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return ((entry1 == null) ? -1 : 0) + ((entry2 == null) ? 1 : 0);
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}
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String column1 = entry1.getFileColumnData(displayMode).get(columnIndex);
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String column2 = entry2.getFileColumnData(displayMode).get(columnIndex);
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if (isAllDigits(column1) && isAllDigits(column2)) {
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int int1 = toInt(column1);
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int int2 = toInt(column2);
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return int1 - int2;
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}
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return column1.compareTo(column2);
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}
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/**
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* Test for digits in the screen.
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*/
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protected boolean isAllDigits(String string) {
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if (string == null || string.length() == 0) return false;
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for (int i=0; i<string.length(); i++) {
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char ch = string.charAt(i);
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if (!Character.isDigit(ch) && ch != ',') {
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return false;
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}
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}
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return true;
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}
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/**
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* Convert String to int.
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*/
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protected int toInt(String string) {
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StringBuffer buf = new StringBuffer(string.length());
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for (int i=0; i<string.length(); i++) {
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char ch = string.charAt(i);
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if (Character.isDigit(ch)) {
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buf.append(ch);
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}
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}
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return Integer.parseInt(buf.toString());
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}
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}
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