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 
17 package com.android.quicksearchbox.util;
18 
19 import 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  */
26 public 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      */
performQuery(SQLiteDatabase db)34     protected abstract A performQuery(SQLiteDatabase db);
35 
36     /**
37      * Runs the query against the database and passes the result to the consumer.
38      */
run(SQLiteDatabase db, Consumer<A> consumer)39     public void run(SQLiteDatabase db, Consumer<A> consumer) {
40         A result = performQuery(db);
41         consumer.consume(result);
42     }
43 }
44