Java Hash Calculate hashPoint(int hashlength, double fraction)

Description

returns fraction*FFFF...FF (hashlenth bytes), represented in hex 0th byte is most significant

License

Apache License

Parameter

Parameter	Description
hashlength	a parameter
fraction	a parameter

Declaration

public static byte[] hashPoint(int hashlength, double fraction) 

Method Source Code

//package com.java2s;
/* //from ww  w.  j  av  a  2 s.  com
Accumulo Collections
Copyright 2016 Isentropy LLC
Written by Jonathan Wolff <jwolff@isentropy.com>
Isentropy specializes in big data and quantitative programming consulting,
with particular expertise in Accumulo development and installation. 
More info at http://isentropy.com.
    
    
Licensed 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.
*/

public class Main {
    /**
     * 
     * returns fraction*FFFF...FF (hashlenth bytes), represented in hex
     * 0th byte is most significant
     * 
     * @param hashlength
     * @param fraction
     * @return
     */

    public static byte[] hashPoint(int hashlength, double fraction) {
        int ones = 0xff;
        byte[] rslt = new byte[hashlength];
        double remainder = 0;
        for (int i = 0; i < rslt.length; i++) {
            double product = (fraction * ones) + (remainder * 256);
            int intpart = (int) product;
            remainder = (product - intpart);
            rslt[i] = (byte) intpart;
        }
        return rslt;
    }
}

Related

1. hashObject(Object obj)
2. hashOrNull(Object value)
3. hashOrZero(Object o)
4. hashPair(int a, int b)
5. hashpair(Object o1, Object o2)
6. hashSetSize(final int nrOfElements)
7. hashThem(Object one, Object two)
8. hashToFloat(int x, int y, long seed)
9. hashToLong(final byte[] hash)