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 SQLite write transactions. 23 */ 24 public abstract class SQLiteTransaction { 25 26 /** 27 * Executes the statements that form the transaction. 28 * 29 * @param db A writable database. 30 * @return {@code true} if the transaction should be committed. 31 */ 32 protected abstract boolean performTransaction(SQLiteDatabase db); 33 34 /** 35 * Runs the transaction against the database. The results are committed if 36 * {@link #performTransaction(SQLiteDatabase)} completes normally and returns {@code true}. 37 */ 38 public void run(SQLiteDatabase db) { 39 db.beginTransaction(); 40 try { 41 if (performTransaction(db)) { 42 db.setTransactionSuccessful(); 43 } 44 } finally { 45 db.endTransaction(); 46 } 47 } 48 } 49
