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/*
* Copyright (C) 2015 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.tv.dvr.provider;
import android.content.Context;
import android.database.Cursor;
import android.os.AsyncTask;
import android.support.annotation.Nullable;
import com.android.tv.data.Channel;
import com.android.tv.data.Program;
import com.android.tv.dvr.Recording;
import com.android.tv.dvr.provider.DvrContract.DvrChannels;
import com.android.tv.dvr.provider.DvrContract.DvrPrograms;
import com.android.tv.dvr.provider.DvrContract.RecordingToPrograms;
import com.android.tv.dvr.provider.DvrContract.Recordings;
import com.android.tv.util.NamedThreadFactory;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* {@link AsyncTask} that defaults to executing on its own single threaded Executor Service.
*/
public abstract class AsyncDvrDbTask<Params, Progress, Result>
extends AsyncTask<Params, Progress, Result> {
private static final NamedThreadFactory THREAD_FACTORY = new NamedThreadFactory(
AsyncDvrDbTask.class.getSimpleName());
private static final ExecutorService DB_EXECUTOR = Executors
.newSingleThreadExecutor(THREAD_FACTORY);
private static DvrDatabaseHelper sDbHelper;
private static synchronized DvrDatabaseHelper initializeDbHelper(Context context) {
if (sDbHelper == null) {
sDbHelper = new DvrDatabaseHelper(context.getApplicationContext());
}
return sDbHelper;
}
final Context mContext;
private AsyncDvrDbTask(Context context) {
mContext = context;
}
/**
* Execute the task on the {@link #DB_EXECUTOR} thread.
*/
@SafeVarargs
public final void executeOnDbThread(Params... params) {
executeOnExecutor(DB_EXECUTOR, params);
}
@Override
protected final Result doInBackground(Params... params) {
initializeDbHelper(mContext);
return doInDvrBackground(params);
}
/**
* Executes in the background after {@link #initializeDbHelper(Context)}
*/
@Nullable
protected abstract Result doInDvrBackground(Params... params);
/**
* Inserts recordings returning the list of recordings with id set.
* The id will be -1 if there was an error.
*/
public abstract static class AsyncAddRecordingTask
extends AsyncDvrDbTask<Recording, Void, List<Recording>> {
public AsyncAddRecordingTask(Context context) {
super(context);
}
@Override
protected final List<Recording> doInDvrBackground(Recording... params) {
return sDbHelper.insertRecordings(params);
}
}
/**
* Update recordings.
*
* @return list of row update counts. The count will be -1 if there was an error or 0
* if no match was found. The count is expected to be exactly 1 for each recording.
*/
public abstract static class AsyncUpdateRecordingTask
extends AsyncDvrDbTask<Recording, Void, List<Integer>> {
public AsyncUpdateRecordingTask(Context context) {
super(context);
}
@Override
protected final List<Integer> doInDvrBackground(Recording... params) {
return sDbHelper.updateRecordings(params);
}
}
/**
* Delete recordings.
*
* @return list of row delete counts. The count will be -1 if there was an error or 0
* if no match was found. The count is expected to be exactly 1 for each recording.
*/
public abstract static class AsyncDeleteRecordingTask
extends AsyncDvrDbTask<Recording, Void, List<Integer>> {
public AsyncDeleteRecordingTask(Context context) {
super(context);
}
@Override
protected final List<Integer> doInDvrBackground(Recording... params) {
return sDbHelper.deleteRecordings(params);
}
}
public abstract static class AsyncDvrQueryTask
extends AsyncDvrDbTask<Void, Void, List<Recording>> {
public AsyncDvrQueryTask(Context context) {
super(context);
}
@Override
@Nullable
protected final List<Recording> doInDvrBackground(Void... params) {
if (isCancelled()) {
return null;
}
// Read Channels Table.
Map<Long, Channel> channelMap = new HashMap<>();
try (Cursor c = sDbHelper.query(DvrChannels.TABLE_NAME, Channel.PROJECTION_DVR)) {
while (c.moveToNext() && !isCancelled()) {
Channel channel = Channel.fromDvrCursor(c);
channelMap.put(channel.getDvrId(), channel);
}
}
if (isCancelled()) {
return null;
}
// Read Programs Table.
Map<Long, Program> programMap = new HashMap<>();
try (Cursor c = sDbHelper.query(DvrPrograms.TABLE_NAME, Program.PROJECTION_DVR)) {
while (c.moveToNext() && !isCancelled()) {
Program program = Program.fromDvrCursor(c);
programMap.put(program.getDvrId(), program);
}
}
if (isCancelled()) {
return null;
}
// Read Mapping Table.
Map<Long, List<Long>> recordingToProgramMap = new HashMap<>();
try (Cursor c = sDbHelper.query(RecordingToPrograms.TABLE_NAME, new String[] {
RecordingToPrograms.COLUMN_RECORDING_ID,
RecordingToPrograms.COLUMN_PROGRAM_ID})) {
while (c.moveToNext() && !isCancelled()) {
long recordingId = c.getLong(0);
List<Long> programList = recordingToProgramMap.get(recordingId);
if (programList == null) {
programList = new ArrayList<>();
recordingToProgramMap.put(recordingId, programList);
}
programList.add(c.getLong(1));
}
}
if (isCancelled()) {
return null;
}
List<Recording> recordings = new ArrayList<>();
try (Cursor c = sDbHelper.query(Recordings.TABLE_NAME, Recording.PROJECTION)) {
int idIndex = c.getColumnIndex(Recordings._ID);
int channelIndex = c.getColumnIndex(Recordings.COLUMN_CHANNEL_ID);
while (c.moveToNext() && !isCancelled()) {
Channel channel = channelMap.get(c.getLong(channelIndex));
List<Program> programs = null;
long recordingId = c.getLong(idIndex);
List<Long> programIds = recordingToProgramMap.get(recordingId);
if (programIds != null) {
programs = new ArrayList<>();
for (long programId : programIds) {
programs.add(programMap.get(programId));
}
}
recordings.add(Recording.fromCursor(c, channel, programs));
}
}
return recordings;
}
}
}
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