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package de.danoeh.antennapod.asynctask;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import android.app.DownloadManager;
import android.content.Context;
import android.database.Cursor;
import android.os.AsyncTask;
import android.util.Log;
import de.danoeh.antennapod.feed.FeedFile;
import de.danoeh.antennapod.storage.DownloadRequester;
import de.danoeh.antennapod.AppConfig;
import de.danoeh.antennapod.R;
/** Observes the status of a specific Download */
public class DownloadObserver extends AsyncTask<Void, Void, Void> {
private static final String TAG = "DownloadObserver";
/** Types of downloads to observe. */
public static final int TYPE_FEED = 0;
public static final int TYPE_IMAGE = 1;
public static final int TYPE_MEDIA = 2;
/** Error codes */
public static final int ALREADY_DOWNLOADED = 1;
public static final int NO_DOWNLOAD_FOUND = 2;
private final long DEFAULT_WAITING_INTERVALL = 1000L;
private DownloadRequester requester;
private Context context;
private ArrayList<DownloadStatus> statusList;
private List<DownloadObserver.Callback> observer;
public DownloadObserver(Context context) {
super();
this.context = context;
requester = DownloadRequester.getInstance();
statusList = new ArrayList<DownloadStatus>();
observer = Collections
.synchronizedList(new ArrayList<DownloadObserver.Callback>());
}
@Override
protected void onCancelled() {
if (AppConfig.DEBUG) Log.d(TAG, "Task was cancelled.");
statusList.clear();
for (DownloadObserver.Callback callback : observer) {
callback.onFinish();
}
}
@Override
protected void onPostExecute(Void result) {
if (AppConfig.DEBUG) Log.d(TAG, "Background task has finished");
statusList.clear();
for (DownloadObserver.Callback callback : observer) {
callback.onFinish();
}
}
protected Void doInBackground(Void... params) {
if (AppConfig.DEBUG) Log.d(TAG, "Background Task started.");
while (downloadsLeft() && !isCancelled()) {
refreshStatuslist();
publishProgress();
try {
Thread.sleep(DEFAULT_WAITING_INTERVALL);
} catch (InterruptedException e) {
Log.w(TAG, "Thread was interrupted while waiting.");
}
}
if (AppConfig.DEBUG) Log.d(TAG, "Background Task finished.");
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
for (DownloadObserver.Callback callback : observer) {
callback.onProgressUpdate();
}
}
private void refreshStatuslist() {
ArrayList<DownloadStatus> unhandledItems = new ArrayList<DownloadStatus>(
statusList);
Cursor cursor = getDownloadCursor();
if (cursor.moveToFirst()) {
do {
long downloadId = getDownloadStatus(cursor,
DownloadManager.COLUMN_ID);
FeedFile feedFile = requester.getFeedFile(downloadId);
if (feedFile != null) {
DownloadStatus status = findDownloadStatus(feedFile);
if (status == null) {
status = new DownloadStatus(feedFile);
statusList.add(status);
} else {
unhandledItems.remove(status);
}
// refresh status
int statusId = getDownloadStatus(cursor,
DownloadManager.COLUMN_STATUS);
getDownloadProgress(cursor, status);
switch (statusId) {
case DownloadManager.STATUS_SUCCESSFUL:
status.statusMsg = R.string.download_successful;
status.successful = true;
status.done = true;
case DownloadManager.STATUS_RUNNING:
status.statusMsg = R.string.download_running;
break;
case DownloadManager.STATUS_FAILED:
status.statusMsg = R.string.download_failed;
requester.notifyDownloadService(context);
status.successful = false;
status.done = true;
status.reason = getDownloadStatus(cursor,
DownloadManager.COLUMN_REASON);
case DownloadManager.STATUS_PENDING:
status.statusMsg = R.string.download_pending;
break;
default:
status.done = true;
status.successful = false;
status.statusMsg = R.string.download_cancelled_msg;
}
}
} while (cursor.moveToNext());
}
cursor.close();
// remove unhandled items from statuslist
for (DownloadStatus status : unhandledItems) {
statusList.remove(status);
}
}
/** Request a cursor with all running Feedfile downloads */
private Cursor getDownloadCursor() {
// Collect download ids
int numDownloads = requester.getNumberOfDownloads();
long ids[] = new long[numDownloads];
for (int i = 0; i < numDownloads; i++) {
ids[i] = requester.getDownloadAt(i).getDownloadId();
}
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(ids);
DownloadManager manager = (DownloadManager) context
.getSystemService(Context.DOWNLOAD_SERVICE);
Cursor result = manager.query(query);
return result;
}
/** Return value of a specific column */
private int getDownloadStatus(Cursor c, String column) {
int status = c.getInt(c.getColumnIndex(column));
return status;
}
private void getDownloadProgress(Cursor c, DownloadStatus status) {
status.size = c.getLong(c
.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
status.soFar = c
.getLong(c
.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
status.progressPercent = (int) (((double) status.soFar / (double) status.size) * 100);
}
public Context getContext() {
return context;
}
/** Find a DownloadStatus entry by its FeedFile */
public DownloadStatus findDownloadStatus(FeedFile f) {
for (DownloadStatus status : statusList) {
if (status.feedfile == f) {
return status;
}
}
return null;
}
public ArrayList<DownloadStatus> getStatusList() {
return statusList;
}
private boolean downloadsLeft() {
return !requester.hasNoDownloads();
}
public void registerCallback(DownloadObserver.Callback callback) {
observer.add(callback);
}
public void unregisterCallback(DownloadObserver.Callback callback) {
observer.remove(callback);
}
public interface Callback {
public void onProgressUpdate();
public void onFinish();
}
}
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