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/*
* Copyright (C) 2013 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.documentsui;
import static com.android.documentsui.DocumentsActivity.State.SORT_ORDER_DISPLAY_NAME;
import static com.android.documentsui.DocumentsActivity.State.SORT_ORDER_LAST_MODIFIED;
import static com.android.documentsui.DocumentsActivity.State.SORT_ORDER_SIZE;
import android.content.AsyncTaskLoader;
import android.content.ContentProviderClient;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.CancellationSignal;
import android.os.OperationCanceledException;
import android.provider.DocumentsContract.Document;
import libcore.io.IoUtils;
class DirectoryResult implements AutoCloseable {
ContentProviderClient client;
Cursor cursor;
Exception exception;
@Override
public void close() {
IoUtils.closeQuietly(cursor);
ContentProviderClient.closeQuietly(client);
cursor = null;
client = null;
}
}
public class DirectoryLoader extends AsyncTaskLoader<DirectoryResult> {
private final ForceLoadContentObserver mObserver = new ForceLoadContentObserver();
private final String mRootId;
private final Uri mUri;
private final int mSortOrder;
private CancellationSignal mSignal;
private DirectoryResult mResult;
public DirectoryLoader(Context context, String rootId, Uri uri, int sortOrder) {
super(context);
mRootId = rootId;
mUri = uri;
mSortOrder = sortOrder;
}
@Override
public final DirectoryResult loadInBackground() {
synchronized (this) {
if (isLoadInBackgroundCanceled()) {
throw new OperationCanceledException();
}
mSignal = new CancellationSignal();
}
final DirectoryResult result = new DirectoryResult();
final String authority = mUri.getAuthority();
try {
result.client = getContext()
.getContentResolver().acquireUnstableContentProviderClient(authority);
final Cursor cursor = result.client.query(
mUri, null, null, null, getQuerySortOrder(mSortOrder), mSignal);
final Cursor withRoot = new RootCursorWrapper(mUri.getAuthority(), mRootId, cursor, -1);
final Cursor sorted = new SortingCursorWrapper(withRoot, mSortOrder);
result.cursor = sorted;
result.cursor.registerContentObserver(mObserver);
} catch (Exception e) {
result.exception = e;
ContentProviderClient.closeQuietly(result.client);
} finally {
synchronized (this) {
mSignal = null;
}
}
return result;
}
@Override
public void cancelLoadInBackground() {
super.cancelLoadInBackground();
synchronized (this) {
if (mSignal != null) {
mSignal.cancel();
}
}
}
@Override
public void deliverResult(DirectoryResult result) {
if (isReset()) {
IoUtils.closeQuietly(result);
return;
}
DirectoryResult oldResult = mResult;
mResult = result;
if (isStarted()) {
super.deliverResult(result);
}
if (oldResult != null && oldResult != result) {
IoUtils.closeQuietly(oldResult);
}
}
@Override
protected void onStartLoading() {
if (mResult != null) {
deliverResult(mResult);
}
if (takeContentChanged() || mResult == null) {
forceLoad();
}
}
@Override
protected void onStopLoading() {
cancelLoad();
}
@Override
public void onCanceled(DirectoryResult result) {
IoUtils.closeQuietly(result);
}
@Override
protected void onReset() {
super.onReset();
// Ensure the loader is stopped
onStopLoading();
IoUtils.closeQuietly(mResult);
mResult = null;
getContext().getContentResolver().unregisterContentObserver(mObserver);
}
public static String getQuerySortOrder(int sortOrder) {
switch (sortOrder) {
case SORT_ORDER_DISPLAY_NAME:
return Document.COLUMN_DISPLAY_NAME + " ASC";
case SORT_ORDER_LAST_MODIFIED:
return Document.COLUMN_LAST_MODIFIED + " DESC";
case SORT_ORDER_SIZE:
return Document.COLUMN_SIZE + " DESC";
default:
return null;
}
}
}
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