| /* |
| * Copyright (C) 2017 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.data.epg; |
| |
| import android.content.ContentProviderOperation; |
| import android.content.Context; |
| import android.content.OperationApplicationException; |
| import android.database.Cursor; |
| import android.media.tv.TvContract; |
| import android.media.tv.TvContract.Programs; |
| import android.os.RemoteException; |
| import android.preference.PreferenceManager; |
| import android.support.annotation.WorkerThread; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| import com.android.tv.data.Program; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| /** The helper class for {@link com.android.tv.data.epg.EpgFetcher} */ |
| class EpgFetchHelper { |
| private static final String TAG = "EpgFetchHelper"; |
| private static final boolean DEBUG = false; |
| |
| private static final long PROGRAM_QUERY_DURATION_MS = TimeUnit.DAYS.toMillis(30); |
| private static final int BATCH_OPERATION_COUNT = 100; |
| |
| // Value: Long |
| private static final String KEY_LAST_UPDATED_EPG_TIMESTAMP = |
| "com.android.tv.data.epg.EpgFetcher.LastUpdatedEpgTimestamp"; |
| // Value: String |
| private static final String KEY_LAST_LINEUP_ID = |
| "com.android.tv.data.epg.EpgFetcher.LastLineupId"; |
| |
| private static long sLastEpgUpdatedTimestamp = -1; |
| private static String sLastLineupId; |
| |
| private EpgFetchHelper() { } |
| |
| /** |
| * Updates newly fetched EPG data for the given channel to local providers. The method will |
| * compare the broadcasting time and try to match each newly fetched program with old programs |
| * of that channel in the database one by one. It will update the matched old program, or insert |
| * the new program if there is no matching program can be found in the database and at the same |
| * time remove those old programs which conflicts with the inserted one. |
| |
| * @param channelId the target channel ID. |
| * @param fetchedPrograms the newly fetched program data. |
| * @return {@code true} if new program data are successfully updated. Otherwise {@code false}. |
| */ |
| static boolean updateEpgData(Context context, long channelId, List<Program> fetchedPrograms) { |
| final int fetchedProgramsCount = fetchedPrograms.size(); |
| if (fetchedProgramsCount == 0) { |
| return false; |
| } |
| boolean updated = false; |
| long startTimeMs = System.currentTimeMillis(); |
| long endTimeMs = startTimeMs + PROGRAM_QUERY_DURATION_MS; |
| List<Program> oldPrograms = queryPrograms(context, channelId, startTimeMs, endTimeMs); |
| int oldProgramsIndex = 0; |
| int newProgramsIndex = 0; |
| |
| // Compare the new programs with old programs one by one and update/delete the old one |
| // or insert new program if there is no matching program in the database. |
| ArrayList<ContentProviderOperation> ops = new ArrayList<>(); |
| while (newProgramsIndex < fetchedProgramsCount) { |
| Program oldProgram = oldProgramsIndex < oldPrograms.size() |
| ? oldPrograms.get(oldProgramsIndex) : null; |
| Program newProgram = fetchedPrograms.get(newProgramsIndex); |
| boolean addNewProgram = false; |
| if (oldProgram != null) { |
| if (oldProgram.equals(newProgram)) { |
| // Exact match. No need to update. Move on to the next programs. |
| oldProgramsIndex++; |
| newProgramsIndex++; |
| } else if (hasSameTitleAndOverlap(oldProgram, newProgram)) { |
| // Partial match. Update the old program with the new one. |
| // NOTE: Use 'update' in this case instead of 'insert' and 'delete'. There |
| // could be application specific settings which belong to the old program. |
| ops.add(ContentProviderOperation.newUpdate( |
| TvContract.buildProgramUri(oldProgram.getId())) |
| .withValues(Program.toContentValues(newProgram)) |
| .build()); |
| oldProgramsIndex++; |
| newProgramsIndex++; |
| } else if (oldProgram.getEndTimeUtcMillis() < newProgram.getEndTimeUtcMillis()) { |
| // No match. Remove the old program first to see if the next program in |
| // {@code oldPrograms} partially matches the new program. |
| ops.add(ContentProviderOperation.newDelete( |
| TvContract.buildProgramUri(oldProgram.getId())) |
| .build()); |
| oldProgramsIndex++; |
| } else { |
| // No match. The new program does not match any of the old programs. Insert |
| // it as a new program. |
| addNewProgram = true; |
| newProgramsIndex++; |
| } |
| } else { |
| // No old programs. Just insert new programs. |
| addNewProgram = true; |
| newProgramsIndex++; |
| } |
| if (addNewProgram) { |
| ops.add(ContentProviderOperation |
| .newInsert(Programs.CONTENT_URI) |
| .withValues(Program.toContentValues(newProgram)) |
| .build()); |
| } |
| // Throttle the batch operation not to cause TransactionTooLargeException. |
| if (ops.size() > BATCH_OPERATION_COUNT || newProgramsIndex >= fetchedProgramsCount) { |
| try { |
| if (DEBUG) { |
| int size = ops.size(); |
| Log.d(TAG, "Running " + size + " operations for channel " + channelId); |
| for (int i = 0; i < size; ++i) { |
| Log.d(TAG, "Operation(" + i + "): " + ops.get(i)); |
| } |
| } |
| context.getContentResolver().applyBatch(TvContract.AUTHORITY, ops); |
| updated = true; |
| } catch (RemoteException | OperationApplicationException e) { |
| Log.e(TAG, "Failed to insert programs.", e); |
| return updated; |
| } |
| ops.clear(); |
| } |
| } |
| if (DEBUG) { |
| Log.d(TAG, "Updated " + fetchedProgramsCount + " programs for channel " + channelId); |
| } |
| return updated; |
| } |
| |
| private static List<Program> queryPrograms(Context context, long channelId, |
| long startTimeMs, long endTimeMs) { |
| try (Cursor c = context.getContentResolver().query( |
| TvContract.buildProgramsUriForChannel(channelId, startTimeMs, endTimeMs), |
| Program.PROJECTION, null, null, Programs.COLUMN_START_TIME_UTC_MILLIS)) { |
| if (c == null) { |
| return Collections.emptyList(); |
| } |
| ArrayList<Program> programs = new ArrayList<>(); |
| while (c.moveToNext()) { |
| programs.add(Program.fromCursor(c)); |
| } |
| return programs; |
| } |
| } |
| |
| /** |
| * Returns {@code true} if the {@code oldProgram} needs to be updated with the |
| * {@code newProgram}. |
| */ |
| private static boolean hasSameTitleAndOverlap(Program oldProgram, Program newProgram) { |
| // NOTE: Here, we update the old program if it has the same title and overlaps with the |
| // new program. The test logic is just an example and you can modify this. E.g. check |
| // whether the both programs have the same program ID if your EPG supports any ID for |
| // the programs. |
| return TextUtils.equals(oldProgram.getTitle(), newProgram.getTitle()) |
| && oldProgram.getStartTimeUtcMillis() <= newProgram.getEndTimeUtcMillis() |
| && newProgram.getStartTimeUtcMillis() <= oldProgram.getEndTimeUtcMillis(); |
| } |
| |
| /** |
| * Sets the last known lineup ID into shared preferences for future usage. If channels are not |
| * re-scanned, EPG fetcher can directly use this value instead of checking the correct lineup ID |
| * every time when it needs to fetch EPG data. |
| */ |
| @WorkerThread |
| synchronized static void setLastLineupId(Context context, String lineupId) { |
| if (DEBUG) { |
| if (lineupId == null) { |
| Log.d(TAG, "Clear stored lineup id: " + sLastLineupId); |
| } |
| } |
| sLastLineupId = lineupId; |
| PreferenceManager.getDefaultSharedPreferences(context).edit() |
| .putString(KEY_LAST_LINEUP_ID, lineupId).apply(); |
| } |
| |
| /** |
| * Gets the last known lineup ID from shared preferences. |
| */ |
| synchronized static String getLastLineupId(Context context) { |
| if (sLastLineupId == null) { |
| sLastLineupId = PreferenceManager.getDefaultSharedPreferences(context) |
| .getString(KEY_LAST_LINEUP_ID, null); |
| } |
| if (DEBUG) Log.d(TAG, "Last lineup is " + sLastLineupId); |
| return sLastLineupId; |
| } |
| |
| /** |
| * Sets the last updated timestamp of EPG data into shared preferences. If the EPG data is not |
| * out-dated, it's not necessary for EPG fetcher to fetch EPG again. |
| */ |
| @WorkerThread |
| synchronized static void setLastEpgUpdatedTimestamp(Context context, long timestamp) { |
| sLastEpgUpdatedTimestamp = timestamp; |
| PreferenceManager.getDefaultSharedPreferences(context).edit().putLong( |
| KEY_LAST_UPDATED_EPG_TIMESTAMP, timestamp).apply(); |
| } |
| |
| /** |
| * Gets the last updated timestamp of EPG data. |
| */ |
| synchronized static long getLastEpgUpdatedTimestamp(Context context) { |
| if (sLastEpgUpdatedTimestamp < 0) { |
| sLastEpgUpdatedTimestamp = PreferenceManager.getDefaultSharedPreferences(context) |
| .getLong(KEY_LAST_UPDATED_EPG_TIMESTAMP, 0); |
| } |
| return sLastEpgUpdatedTimestamp; |
| } |
| } |