Java Bit Shift shift(int direction, long sq, int delta)

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Description

shift

License

LGPL

Declaration 

public static long shift(int direction, long sq, int delta)

Method Source Code

//package com.java2s;
//License from project: LGPL 

public class Main {
    private static long[] SHIFT_MASKS = new long[8];
    private static final int[] DIRECTION_SHIFTS = new int[] { 8, 9, 1, -7, -8, -9, -1, 7 };

    public static long shift(int direction, long sq, int delta) {
        long result = sq;
        for (int i = 0; i < delta; i++) {
            result = shift(direction, result);
        }/*w  ww  .ja  v a2 s .  c o m*/
        return result;
    }

    public static long shift(int direction, long sq) {
        int shift = DIRECTION_SHIFTS[direction];
        if (shift < 0)
            return (sq >>> (-shift)) & SHIFT_MASKS[direction];
        else
            return (sq << shift) & SHIFT_MASKS[direction];
    }
}

Related

  1. shift(int a, int b)
  2. shift(int component, int shift)
  3. shift(int length)
  4. shift(String string)
  5. shiftBits(byte b)
  6. shiftByte(byte n, short shift)