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/*
This file is part of Subsonic.
Subsonic 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 3 of the License, or
(at your option) any later version.
Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.domain;
import java.util.Comparator;
import static net.sourceforge.subsonic.domain.MediaFile.MediaType.DIRECTORY;
/**
* Comparator for sorting media files.
*/
public class MediaFileComparator implements Comparator<MediaFile> {
private final boolean sortAlbumsByYear;
public MediaFileComparator(boolean sortAlbumsByYear) {
this.sortAlbumsByYear = sortAlbumsByYear;
}
public int compare(MediaFile a, MediaFile b) {
// Directories before files.
if (a.isFile() && b.isDirectory()) {
return 1;
}
if (a.isDirectory() && b.isFile()) {
return -1;
}
// Non-album directories before album directories.
if (a.isAlbum() && b.getMediaType() == DIRECTORY) {
return 1;
}
if (a.getMediaType() == DIRECTORY && b.isAlbum()) {
return -1;
}
// Sort albums by year
if (sortAlbumsByYear && a.isAlbum() && b.isAlbum()) {
int i = nullSafeCompare(a.getYear(), b.getYear(), false);
if (i != 0) {
return i;
}
}
if (a.isDirectory() && b.isDirectory()) {
return a.getName().compareToIgnoreCase(b.getName());
}
// Compare by disc and track numbers, if present.
Integer trackA = getSortableDiscAndTrackNumber(a);
Integer trackB = getSortableDiscAndTrackNumber(b);
int i = nullSafeCompare(trackA, trackB, false);
if (i != 0) {
return i;
}
return a.getName().compareToIgnoreCase(b.getName());
}
private <T extends Comparable<T>> int nullSafeCompare(T a, T b, boolean nullIsSmaller) {
if (a == null && b == null) {
return 0;
}
if (a == null) {
return nullIsSmaller ? -1 : 1;
}
if (b == null) {
return nullIsSmaller ? 1 : -1;
}
return a.compareTo(b);
}
private Integer getSortableDiscAndTrackNumber(MediaFile file) {
if (file.getTrackNumber() == null) {
return null;
}
int discNumber = file.getDiscNumber() == null ? 1 : file.getDiscNumber();
return discNumber * 1000 + file.getTrackNumber();
}
}
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