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/*
* Copyright (C) 2014 The Android Open Source 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.android.inputmethod.dictionarypack;
import android.app.DownloadManager;
import android.app.DownloadManager.Query;
import android.app.DownloadManager.Request;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteException;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.FileNotFoundException;
import java.util.Arrays;
import javax.annotation.Nullable;
/**
* A class to help with calling DownloadManager methods.
*
* Mostly, the problem here is that most methods from DownloadManager may throw SQL exceptions if
* they can't open the database on disk. We want to avoid crashing in these cases but can't do
* much more, so this class insulates the callers from these. SQLiteException also inherit from
* RuntimeException so they are unchecked :(
* While we're at it, we also insulate callers from the cases where DownloadManager is disabled,
* and getSystemService returns null.
*/
public class DownloadManagerWrapper {
private final static String TAG = DownloadManagerWrapper.class.getSimpleName();
private final DownloadManager mDownloadManager;
public DownloadManagerWrapper(final Context context) {
this((DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE));
}
private DownloadManagerWrapper(final DownloadManager downloadManager) {
mDownloadManager = downloadManager;
}
public void remove(final long... ids) {
try {
if (null != mDownloadManager) {
mDownloadManager.remove(ids);
}
} catch (IllegalArgumentException e) {
// This is expected to happen on boot when the device is encrypted.
} catch (SQLiteException e) {
// We couldn't remove the file from DownloadManager. Apparently, the database can't
// be opened. It may be a problem with file system corruption. In any case, there is
// not much we can do apart from avoiding crashing.
Log.e(TAG, "Can't remove files with ID " + Arrays.toString(ids) +
" from download manager", e);
}
}
public ParcelFileDescriptor openDownloadedFile(final long fileId) throws FileNotFoundException {
try {
if (null != mDownloadManager) {
return mDownloadManager.openDownloadedFile(fileId);
}
} catch (IllegalArgumentException e) {
// This is expected to happen on boot when the device is encrypted.
} catch (SQLiteException e) {
Log.e(TAG, "Can't open downloaded file with ID " + fileId, e);
}
// We come here if mDownloadManager is null or if an exception was thrown.
throw new FileNotFoundException();
}
@Nullable
public Cursor query(final Query query) {
try {
if (null != mDownloadManager) {
return mDownloadManager.query(query);
}
} catch (IllegalArgumentException e) {
// This is expected to happen on boot when the device is encrypted.
} catch (SQLiteException e) {
Log.e(TAG, "Can't query the download manager", e);
}
// We come here if mDownloadManager is null or if an exception was thrown.
return null;
}
public long enqueue(final Request request) {
try {
if (null != mDownloadManager) {
return mDownloadManager.enqueue(request);
}
} catch (IllegalArgumentException e) {
// This is expected to happen on boot when the device is encrypted.
} catch (SQLiteException e) {
Log.e(TAG, "Can't enqueue a request with the download manager", e);
}
return 0;
}
}
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