1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.quicksearchbox.util;
18
19import android.database.sqlite.SQLiteDatabase;
20
21/**
22 * Abstract helper base class for asynchronous SQLite queries.
23 *
24 * @param <A> The type of the result of the query.
25 */
26public abstract class SQLiteAsyncQuery<A> {
27
28    /**
29     * Performs a query and computes some value from the result
30     *
31     * @param db A readable database.
32     * @return The result of the query.
33     */
34    protected abstract A performQuery(SQLiteDatabase db);
35
36    /**
37     * Runs the query against the database and passes the result to the consumer.
38     */
39    public void run(SQLiteDatabase db, Consumer<A> consumer) {
40        A result = performQuery(db);
41        consumer.consume(result);
42    }
43}
44