| /* |
| * 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.settings.search; |
| |
| import android.content.Context; |
| import android.database.Cursor; |
| import android.database.sqlite.SQLiteDatabase; |
| import android.support.annotation.VisibleForTesting; |
| |
| import com.android.settings.search.IndexDatabaseHelper.SavedQueriesColumns; |
| import com.android.settings.utils.AsyncLoader; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Loader for recently searched queries. |
| */ |
| public class SavedQueryLoader extends AsyncLoader<List<? extends SearchResult>> { |
| |
| // Max number of proposed suggestions |
| @VisibleForTesting |
| static final int MAX_PROPOSED_SUGGESTIONS = 5; |
| |
| private final SQLiteDatabase mDatabase; |
| |
| public SavedQueryLoader(Context context) { |
| super(context); |
| mDatabase = IndexDatabaseHelper.getInstance(context).getReadableDatabase(); |
| } |
| |
| @Override |
| protected void onDiscardResult(List<? extends SearchResult> result) { |
| |
| } |
| |
| @Override |
| public List<? extends SearchResult> loadInBackground() { |
| try (final Cursor cursor = mDatabase.query( |
| IndexDatabaseHelper.Tables.TABLE_SAVED_QUERIES /* table */, |
| new String[]{SavedQueriesColumns.QUERY} /* columns */, |
| null /* selection */, |
| null /* selectionArgs */, |
| null /* groupBy */, |
| null /* having */, |
| "rowId DESC" /* orderBy */, |
| String.valueOf(MAX_PROPOSED_SUGGESTIONS) /* limit */)) { |
| return convertCursorToResult(cursor); |
| } |
| } |
| |
| private List<SearchResult> convertCursorToResult(Cursor cursor) { |
| final List<SearchResult> results = new ArrayList<>(); |
| while (cursor.moveToNext()) { |
| final SavedQueryPayload payload = new SavedQueryPayload( |
| cursor.getString(cursor.getColumnIndex(SavedQueriesColumns.QUERY))); |
| results.add(new SearchResult.Builder() |
| .setStableId(payload.hashCode()) |
| .setTitle(payload.query) |
| .setPayload(payload) |
| .build()); |
| } |
| return results; |
| } |
| } |