/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.route.function;
import java.math.BigInteger;
import org.opencloudb.config.model.rule.RuleAlgorithm;
/**
* number column partion by Mod operator
* if count is 10 then 0 to 0,21 to 1 (21 % 10 =1)
* @author wuzhih
*
*/
public class PartionByMod extends AbstractPartionAlgorithm implements RuleAlgorithm {
private int count;
@Override
public void init() {
}
public void setCount(int count) {
this.count = count;
}
@Override
public Integer calculate(String columnValue) {
BigInteger bigNum = new BigInteger(columnValue).abs();
return (bigNum.mod(BigInteger.valueOf(count))).intValue();
}
}