Java BigInteger Create Create(BigInteger value)

Description

Create a bitset from a positive BigInteger.

License

Open Source License

Parameter

Parameter	Description
value	The BigInteger value.

Exception

Parameter	Description
IllegalArgumentException	if value is negative

Return

The corresponding BitSet.

Declaration

public static BitSet Create(BigInteger value) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.*;
import java.math.*;

public class Main {
    /**/*  w w w  .ja  v a 2  s . c o  m*/
     * Create a bitset from a positive long.
     * 
     * @param value The long value.
     * 
     * @return The corresponding BitSet.
     * 
     * @throws IllegalArgumentException if value is negative
     */
    public static BitSet Create(long value) {

        if (value < 0)
            throw new IllegalArgumentException("value must be greater than zero (" + value + ")");
        BitSet newBS = new BitSet();
        int highBit = (int) Math.ceil(Math.log(value + 1) / Math.log(2));
        for (int index = 0; index < highBit; index += 1) {
            long bit = (long) Math.pow(2, index);
            newBS.set(index, (bit & value) == bit);
        }
        return newBS;
    }

    /**
     * Create a bitset from a positive BigInteger.
     * 
     * @param value The BigInteger value.
     * 
     * @return The corresponding BitSet.
     * 
     * @throws IllegalArgumentException if value is negative
     */
    public static BitSet Create(BigInteger value) {

        if (value.compareTo(BigInteger.ZERO) < 0)
            throw new IllegalArgumentException("value must be greater than zero (" + value + ")");
        int numbits = value.bitLength() + 1;
        BitSet newBS = new BitSet(numbits);
        for (int index = 0; index < numbits; index += 1) {
            if (value.testBit(index)) {
                newBS.set(index);
            }
        }
        return newBS;
    }
}

Related

1. createBigInteger(final String str)
2. createBigInteger(final String str)
3. createBigInteger(final String value)
4. createBigInteger(String str)