Mercurial > hg > blitz_stable
annotate src/org/dancres/struct/BitVisitorImpl.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.struct; |
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2 |
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3 /** |
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4 A class to take a bit array and iterate over them reporting offset of |
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5 each set bit. |
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6 */ |
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7 public class BitVisitorImpl implements BitVisitor { |
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8 private Object[] theLocks; |
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9 private long[] theBits; |
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Dan Creswell <dan.creswell@gmail.com>
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10 |
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11 private int theBitGroupIndex = 0; |
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12 private int theBitGroupPtr = 0; |
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13 |
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14 private int theBase = 0; |
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15 |
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16 private long theMask = 1L; |
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17 |
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18 private boolean testZero; |
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19 |
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20 public BitVisitorImpl(long[] aBits, Object[] aLocks, boolean findZero) { |
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21 theBits = aBits; |
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22 theLocks = aLocks; |
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23 testZero = findZero; |
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24 } |
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25 |
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Dan Creswell <dan.creswell@gmail.com>
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26 /** |
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27 @return -1 when no bits are left |
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28 */ |
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29 public int getNext() { |
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30 while (theBitGroupIndex < theBits.length) { |
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31 long myLong; |
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32 |
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33 synchronized(theLocks[theBitGroupIndex]) { |
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34 myLong = theBits[theBitGroupIndex]; |
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35 } |
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36 |
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37 if (myLong != 0) { |
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38 while (theBitGroupPtr < 64) { |
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39 ++theBitGroupPtr; |
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40 |
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41 if (testZero) { |
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42 if ((myLong & theMask) == 0) { |
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43 theMask = theMask << 1; |
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44 return (theBase + theBitGroupPtr - 1); |
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45 } else |
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46 theMask = theMask << 1; |
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Dan Creswell <dan.creswell@gmail.com>
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47 } else { |
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Dan Creswell <dan.creswell@gmail.com>
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48 if ((myLong & theMask) != 0) { |
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49 theMask = theMask << 1; |
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50 return (theBase + theBitGroupPtr - 1); |
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Dan Creswell <dan.creswell@gmail.com>
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51 } else |
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52 theMask = theMask << 1; |
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53 } |
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54 } |
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55 |
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56 // Get ready for next block |
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57 theBitGroupPtr = 0; |
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58 } |
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59 |
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60 theBase += 64; |
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61 ++theBitGroupIndex; |
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62 theMask = 1L; |
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63 } |
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64 |
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65 return -1; |
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66 } |
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67 } |