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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.tv.search;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.media.tv.TvContract.Channels;
import android.media.tv.TvContract.Programs;
import android.net.Uri;
import com.android.internal.util.Preconditions;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class TvProviderSearch {
public static List<SearchResult> search(Context context, String query, int limit) {
List<SearchResult> results = new ArrayList<SearchResult>();
results.addAll(searchChannels(context, query, new String[] {
Channels.COLUMN_DISPLAY_NAME,
Channels.COLUMN_DESCRIPTION
}, limit));
if (results.size() >= limit) {
return results;
}
Set<Long> previousResults = getChannelIdSet(results);
limit -= results.size();
results.addAll(searchPrograms(context, query, new String[] {
Programs.COLUMN_TITLE,
Programs.COLUMN_SHORT_DESCRIPTION
}, previousResults, limit));
return results;
}
private static Set<Long> getChannelIdSet(List<SearchResult> results) {
Set<Long> channelIdSet = new HashSet<Long>();
for (SearchResult sr : results) {
channelIdSet.add(sr.getChannelId());
}
return channelIdSet;
}
private static List<SearchResult> searchChannels(Context context, String query,
String[] columnNames, int limit) {
Preconditions.checkState(columnNames != null && columnNames.length > 0);
String[] projection = {
Channels._ID,
Channels.COLUMN_DISPLAY_NAME,
Channels.COLUMN_DESCRIPTION,
};
StringBuilder sb = new StringBuilder();
sb.append(Channels.COLUMN_BROWSABLE).append("=1 AND ");
sb.append(Channels.COLUMN_SEARCHABLE).append("=1 AND (");
sb.append(columnNames[0]).append(" like ?");
for (int i = 1; i < columnNames.length; ++i) {
sb.append(" OR ").append(columnNames[i]).append(" like ?");
}
sb.append(")");
String selection = sb.toString();
String selectionArg = "%" + query + "%";
String[] selectionArgs = new String[columnNames.length];
for (int i = 0; i < selectionArgs.length; ++i) {
selectionArgs[i] = selectionArg;
}
return search(context, Channels.CONTENT_URI, projection, selection, selectionArgs, limit,
null);
}
private static List<SearchResult> searchPrograms(final Context context, String query,
String[] columnNames, final Set<Long> previousResults, int limit) {
Preconditions.checkState(columnNames != null && columnNames.length > 0);
String[] projection = {
Programs.COLUMN_CHANNEL_ID,
Programs.COLUMN_TITLE,
Programs.COLUMN_SHORT_DESCRIPTION,
};
StringBuilder sb = new StringBuilder();
// Search among the programs which are now being on the air.
sb.append(Programs.COLUMN_START_TIME_UTC_MILLIS).append("<=? AND ");
sb.append(Programs.COLUMN_END_TIME_UTC_MILLIS).append(">=? AND (");
sb.append(columnNames[0]).append(" like ?");
for (int i = 1; i < columnNames.length; ++i) {
sb.append(" OR ").append(columnNames[0]).append(" like ?");
}
sb.append(")");
String selection = sb.toString();
String selectionArg = "%" + query + "%";
String[] selectionArgs = new String[columnNames.length+2];
selectionArgs[0] = selectionArgs[1] = String.valueOf(System.currentTimeMillis());
for (int i = 2; i < selectionArgs.length; ++i) {
selectionArgs[i] = selectionArg;
}
return search(context, Programs.CONTENT_URI, projection, selection, selectionArgs, limit,
new ResultFilter() {
private Map<Long, Boolean> searchableMap = new HashMap<Long, Boolean>();
@Override
public boolean filter(Cursor c) {
long id = c.getLong(0);
// Filter out the program whose channel is already searched.
if (previousResults.contains(id)) {
return false;
}
// The channel is cached.
Boolean isSearchable = searchableMap.get(id);
if (isSearchable != null) {
return isSearchable;
}
// Don't know whether the channel is searchable or not.
String selection = Channels._ID + "=? AND "
+ Channels.COLUMN_BROWSABLE + "=1 AND "
+ Channels.COLUMN_SEARCHABLE + "=1";
Cursor cursor = null;
try {
// Don't need to fetch all the columns.
cursor = context.getContentResolver().query(Channels.CONTENT_URI,
new String[] { Channels._ID }, selection,
new String[] { String.valueOf(id) }, null);
boolean isSearchableChannel = cursor != null && cursor.getCount() > 0;
searchableMap.put(id, isSearchableChannel);
return isSearchableChannel;
} finally {
if (cursor != null) {
cursor.close();
}
}
}
});
}
private static List<SearchResult> search(Context context, Uri uri, String[] projection,
String selection, String[] selectionArgs, int limit, ResultFilter resultFilter) {
List<SearchResult> results = new ArrayList<SearchResult>();
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null) {
// TODO: Need to add image when available.
int count = 0;
while (cursor.moveToNext()) {
if (resultFilter != null && !resultFilter.filter(cursor)) {
continue;
}
long id = cursor.getLong(0);
String title = cursor.getString(1);
String description = cursor.getString(2);
SearchResult result = SearchResult.builder()
.setChannelId(id)
.setTitle(title)
.setDescription(description)
.setIntentAction(Intent.ACTION_VIEW)
.setIntentData(ContentUris.withAppendedId(Channels.CONTENT_URI, id)
.toString())
.build();
results.add(result);
if (++count >= limit) {
break;
}
}
}
} finally {
if (cursor != null) {
cursor.close();
}
}
return results;
}
private interface ResultFilter {
boolean filter(Cursor c);
}
}
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