| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.fs.slive; |
| |
| import java.util.Random; |
| |
| /** |
| * Class which is used to create the data to write for a given path and offset |
| * into that file for writing and later verification that the expected value is |
| * read at that file bytes offset |
| */ |
| class DataHasher { |
| |
| private Random rnd; |
| |
| DataHasher(long mixIn) { |
| this.rnd = new Random(mixIn); |
| } |
| |
| /** |
| * @param offSet |
| * the byte offset into the file |
| * |
| * @return the data to be expected at that offset |
| */ |
| long generate(long offSet) { |
| return ((offSet * 47) ^ (rnd.nextLong() * 97)) * 37; |
| } |
| |
| } |