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99 lines
3.0 KiB
99 lines
3.0 KiB
/*
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This file is part of Airsonic.
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Airsonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Airsonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Airsonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2016 (C) Airsonic Authors
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Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
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*/
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package org.airsonic.player.domain;
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import java.util.Comparator;
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/**
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* Comparator for sorting media files.
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*/
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public class MediaFileComparator implements Comparator<MediaFile> {
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private final boolean sortAlbumsByYear;
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public MediaFileComparator(boolean sortAlbumsByYear) {
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this.sortAlbumsByYear = sortAlbumsByYear;
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}
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public int compare(MediaFile a, MediaFile b) {
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// Directories before files.
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if (a.isFile() && b.isDirectory()) {
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return 1;
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}
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if (a.isDirectory() && b.isFile()) {
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return -1;
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}
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// Non-album directories before album directories.
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if (a.isAlbum() && b.getMediaType() == MediaFile.MediaType.DIRECTORY) {
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return 1;
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}
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if (a.getMediaType() == MediaFile.MediaType.DIRECTORY && b.isAlbum()) {
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return -1;
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}
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// Sort albums by year
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if (sortAlbumsByYear && a.isAlbum() && b.isAlbum()) {
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int i = nullSafeCompare(a.getYear(), b.getYear(), false);
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if (i != 0) {
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return i;
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}
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}
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if (a.isDirectory() && b.isDirectory()) {
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int n = a.getName().compareToIgnoreCase(b.getName());
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return n == 0 ? a.getPath().compareToIgnoreCase(b.getPath()) : n; // To make it consistent to MediaFile.equals()
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}
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// Compare by disc and track numbers, if present.
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Integer trackA = getSortableDiscAndTrackNumber(a);
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Integer trackB = getSortableDiscAndTrackNumber(b);
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int i = nullSafeCompare(trackA, trackB, false);
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if (i != 0) {
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return i;
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}
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return a.getPath().compareToIgnoreCase(b.getPath());
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}
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private <T extends Comparable<T>> int nullSafeCompare(T a, T b, boolean nullIsSmaller) {
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if (a == null && b == null) {
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return 0;
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}
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if (a == null) {
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return nullIsSmaller ? -1 : 1;
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}
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if (b == null) {
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return nullIsSmaller ? 1 : -1;
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}
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return a.compareTo(b);
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}
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private Integer getSortableDiscAndTrackNumber(MediaFile file) {
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if (file.getTrackNumber() == null) {
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return null;
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}
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int discNumber = file.getDiscNumber() == null ? 1 : file.getDiscNumber();
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return discNumber * 1000 + file.getTrackNumber();
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}
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}
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