Java BitSet to BitsToInt(BitSet bits, int length)

Description

Bits To Int

License

Apache License

Declaration

public static long BitsToInt(BitSet bits, int length) 

Method Source Code

//package com.java2s;
/**/* ww  w  .  j av a 2  s .  c  om*/
 * Copyright 2005 Refactored Networks, LLC
    
   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.
    
 */

import java.util.BitSet;

public class Main {
    public static long BitsToInt(BitSet bits, int length) {
        int j = 0;
        byte[] bytes = new byte[length / 8 + 1];
        long result = 0;
        for (int i = (length - 1); i >= 0; i--) {
            if (bits.get(i)) {
                bytes[bytes.length - j / 8 - 1] |= 1 << (j % 8);
            }
            j++;
        }
        // copy, then shift the whole thing, not shift then add
        // doing an add brings the whole sign thing into play and
        // that's a Bad Thing (tm)
        for (int i = 0; i < bytes.length - 1; i++) {
            result |= bytes[i] & 0xFF;
            result <<= 8;
        }
        result |= bytes[bytes.length - 1] & 0xFF;
        return (result);
    }
}

Related

1. bitSetToMap(Map map, String key, BitSet bits, int length)
2. bitSetToUnsignedInt(BitSet b, int startBit, int length)
3. bitsToBytes(BitSet ba, int size)
4. BitsToBytes(BitSet bits)
5. bitsToHexString(BitSet ba, int size)
6. convert(BitSet bits)
7. convert(BitSet bits)