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package de.podfetcher.asynctask;
import de.podfetcher.storage.DownloadRequester;
import de.podfetcher.feed.*;
import de.podfetcher.R;
import android.content.Context;
import android.app.DownloadManager;
import android.util.Log;
import android.database.Cursor;
import java.util.concurrent.Callable;
import android.os.AsyncTask;
/** Observes the status of a specific Download */
public class DownloadObserver extends AsyncTask<FeedFile, DownloadStatus, Boolean> {
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 DownloadStatus[] statusList;
public DownloadObserver(Context context) {
super();
this.context = context;
requester = DownloadRequester.getInstance();
}
@Override
protected void onCancelled(Boolean result) {
Log.d(TAG, "Task was cancelled.");
}
protected Boolean doInBackground(FeedFile... files) {
Log.d(TAG, "Background Task started.");
statusList = new DownloadStatus[files.length];
for (int i = 0; i < files.length; i++) {
FeedFile feedfile = files[i];
statusList[i] = new DownloadStatus(feedfile);
if (feedfile.getFile_url() == null) {
statusList[i].reason = NO_DOWNLOAD_FOUND;
statusList[i].successful = false;
statusList[i].done = true;
}
if (feedfile.isDownloaded()) {
statusList[i].reason = ALREADY_DOWNLOADED;
statusList[i].successful = false;
statusList[i].done = true;
}
}
while(downloadsLeft() && !isCancelled()) {
for (DownloadStatus status : statusList) {
if (status.done == false) {
Cursor cursor = getDownloadCursor(status.feedfile);
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;
}
}
}
publishProgress(statusList);
try {
Thread.sleep(DEFAULT_WAITING_INTERVALL);
} catch (InterruptedException e) {
Log.w(TAG, "Thread was interrupted while waiting.");
}
}
Log.d(TAG, "Background Task finished.");
return Boolean.valueOf(true);
}
public Cursor getDownloadCursor(FeedFile feedfile) {
DownloadManager.Query query = buildQuery(feedfile.getDownloadId());
DownloadManager manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
Cursor result = manager.query(query);
return result;
}
public int getDownloadStatus(Cursor c, String column) {
if(c.moveToFirst()) {
int status = c.getInt(c.getColumnIndex(column));
return status;
} else {
return -1;
}
}
private void getDownloadProgress(Cursor c, DownloadStatus status) {
if (c.moveToFirst()) {
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);
Log.d(TAG, "Setting progress to " + status.progressPercent);
}
}
private DownloadManager.Query buildQuery(long id) {
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(id);
return query;
}
public Context getContext() {
return context;
}
public DownloadStatus[] getStatusList() {
return statusList;
}
private boolean downloadsLeft() {
boolean result = false;
for (int i = 0; i < statusList.length; i++) {
if (statusList[i].done == false) {
return true;
}
}
return result;
}
}
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