/**
* 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;
}
}