2 * DemosceneMusic - ConciseNumberFilter.java - Copyright © 2012 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.demoscenemusic.template;
20 import java.util.Arrays;
21 import java.util.List;
24 import net.pterodactylus.util.number.Numbers;
25 import net.pterodactylus.util.template.Filter;
26 import net.pterodactylus.util.template.TemplateContext;
29 * {@link Filter} implementation that only shows the three most significant
30 * digits of a number, adding prefix for kilo (kibi, actually), mega (mebi), et
31 * cetera, as necessary.
33 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
35 public class ConciseNumberFilter implements Filter {
37 private static final List<String> prefixes = Arrays.asList("", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei");
43 public Object format(TemplateContext templateContext, Object data, Map<String, Object> parameters) {
44 double number = Numbers.safeParseLong(data, 0L);
46 while (number > 1023) {
51 return String.format("%1.2f %s", number / 1024.0, prefixes.get(prefix + 1));
54 return String.format("%1.0f %s", number, prefixes.get(prefix));
57 return String.format("%1.1f %s", number, prefixes.get(prefix));
59 return String.format("%1.2f %s", number, prefixes.get(prefix));