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 */ 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
