/***************************************************************************
* Copyright (C) 2012 by H-Store Project *
* Brown University *
* Massachusetts Institute of Technology *
* Yale University *
* *
* Coded By: Justin A. DeBrabant (http://www.cs.brown.edu/~debrabant/) *
* *
* *
* Permission is hereby granted, free of charge, to any person obtaining *
* a copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, sublicense, and/or sell copies of the Software, and to *
* permit persons to whom the Software is furnished to do so, subject to *
* the following conditions: *
* *
* The above copyright notice and this permission notice shall be *
* included in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, *
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
* OTHER DEALINGS IN THE SOFTWARE. *
***************************************************************************/
package edu.brown.benchmark.ycsb;
import java.util.Random;
public abstract class YCSBUtil {
public static final Random rand = new Random();
/**
* @returns a random alphabetic string with length in range [minimum_length,
* maximum_length].
*/
public static String astring(int minimum_length, int maximum_length) {
return randomString(minimum_length, maximum_length, 'A', 26);
}
/**
* @returns a random numeric string with length in range [minimum_length,
* maximum_length].
*/
public static String nstring(int minimum_length, int maximum_length) {
return randomString(minimum_length, maximum_length, '0', 10);
}
// taken from tpcc.RandomGenerator
public static String randomString(int minimum_length, int maximum_length, char base, int numCharacters) {
int length = (int)(minimum_length == maximum_length ?
minimum_length :
number(minimum_length, maximum_length));
byte baseByte = (byte) base;
byte[] bytes = new byte[length];
for (int i = 0; i < length; ++i) {
bytes[i] = (byte) (baseByte + number(0, numCharacters - 1));
}
return new String(bytes);
}
// taken from tpcc.RandomGenerator
public static long number(long minimum, long maximum) {
assert minimum <= maximum;
long value = Math.abs(rand.nextInt()) % (maximum - minimum + 1) + minimum;
value = Math.abs(value); // "fixing" a strange out of range error
assert(minimum <= value && value <= maximum) :
String.format("Unexpected invalid random number '%d' [min=%d / max=%d]",
value, minimum, maximum);
return value;
}
}