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/*
* Copyright (C) 2012 Andrew Neal
* Copyright (C) 2014 The CyanogenMod Project
* Licensed under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
* or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package com.cyanogenmod.eleven.loaders;
import android.content.Context;
import android.database.Cursor;
import android.provider.BaseColumns;
import android.provider.MediaStore;
import android.provider.MediaStore.Audio.ArtistColumns;
import com.cyanogenmod.eleven.model.Artist;
import com.cyanogenmod.eleven.sectionadapter.SectionCreator;
import com.cyanogenmod.eleven.utils.Lists;
import com.cyanogenmod.eleven.utils.PreferenceUtils;
import com.cyanogenmod.eleven.utils.SortOrder;
import com.cyanogenmod.eleven.utils.SortUtils;
import java.util.ArrayList;
import java.util.List;
/**
* Used to query {@link MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI} and
* return the artists on a user's device.
*
* @author Andrew Neal (andrewdneal@gmail.com)
*/
public class ArtistLoader extends SectionCreator.SimpleListLoader<Artist> {
/**
* The result
*/
private ArrayList<Artist> mArtistsList = Lists.newArrayList();
/**
* The {@link Cursor} used to run the query.
*/
private Cursor mCursor;
/**
* Constructor of <code>ArtistLoader</code>
*
* @param context The {@link Context} to use
*/
public ArtistLoader(final Context context) {
super(context);
}
/**
* {@inheritDoc}
*/
@Override
public List<Artist> loadInBackground() {
// Create the Cursor
mCursor = makeArtistCursor(getContext());
// Gather the data
if (mCursor != null && mCursor.moveToFirst()) {
do {
// Copy the artist id
final long id = mCursor.getLong(0);
// Copy the artist name
final String artistName = mCursor.getString(1);
// Copy the number of albums
final int albumCount = mCursor.getInt(2);
// Copy the number of songs
final int songCount = mCursor.getInt(3);
// as per designer's request, don't show unknown artist
if (MediaStore.UNKNOWN_STRING.equals(artistName)) {
continue;
}
// Create a new artist
final Artist artist = new Artist(id, artistName, songCount, albumCount);
mArtistsList.add(artist);
} while (mCursor.moveToNext());
}
// Close the cursor
if (mCursor != null) {
mCursor.close();
mCursor = null;
}
// requested artist ordering
String artistSortOrder = PreferenceUtils.getInstance(mContext).getArtistSortOrder();
// run a custom localized sort to try to fit items in to header buckets more nicely
if (shouldEvokeCustomSortRoutine(artistSortOrder)) {
mArtistsList = SortUtils.localizeSortList(mArtistsList, artistSortOrder);
}
return mArtistsList;
}
/**
* Evoke custom sorting routine if the sorting attribute is a String. MediaProvider's sort
* can be trusted in other instances
* @param sortOrder
* @return
*/
private boolean shouldEvokeCustomSortRoutine(String sortOrder) {
return sortOrder.equals(SortOrder.ArtistSortOrder.ARTIST_A_Z) ||
sortOrder.equals(SortOrder.ArtistSortOrder.ARTIST_Z_A);
}
/**
* Creates the {@link Cursor} used to run the query.
*
* @param context The {@link Context} to use.
* @return The {@link Cursor} used to run the artist query.
*/
public static final Cursor makeArtistCursor(final Context context) {
return context.getContentResolver().query(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI,
new String[] {
/* 0 */
BaseColumns._ID,
/* 1 */
ArtistColumns.ARTIST,
/* 2 */
ArtistColumns.NUMBER_OF_ALBUMS,
/* 3 */
ArtistColumns.NUMBER_OF_TRACKS
}, null, null, PreferenceUtils.getInstance(context).getArtistSortOrder());
}
}
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