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annotate src/org/dancres/blitz/entry/ci/BitLocatorImpl.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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1 package org.dancres.blitz.entry.ci;
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2
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3 import java.io.IOException;
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4
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5 import org.dancres.blitz.oid.OID;
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6
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7 import org.dancres.blitz.entry.TupleLocator;
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8
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9 import org.dancres.struct.BitIndex;
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10 import org.dancres.struct.BitVisitor;
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11
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12 /**
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13 Used by CacheIndexer.
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14 */
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15 class BitLocatorImpl implements TupleLocator {
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16 private BitVisitor theHits;
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17 private OID[] theOIDs;
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18 private int theIndex = 0;
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19 private OID theCurrent;
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20
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21 BitLocatorImpl(BitIndex aHits, OID[] aListOfOIDs, boolean hitOnZero) {
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22 theOIDs = aListOfOIDs;
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23 theHits = aHits.getVisitor(hitOnZero);
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24 }
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25
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26 /**
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27 Invoke this to load the next matching Tuple.
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28
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29 @return <code>true</code> if there was a tuple, <code>false</code>
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30 otherwise
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31 */
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32 public boolean fetchNext() throws IOException {
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33 int myNext;
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34
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35 while ((myNext = theHits.getNext()) != -1) {
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36 theCurrent = (OID) theOIDs[myNext];
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37
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38 if (theCurrent != null)
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39 return true;
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40 else {
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41 /*
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42 System.err.println("There should've been a OID here: " +
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43 myNext);
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44 */
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45 }
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46 }
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47
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48 return false;
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49 }
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50
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51 /**
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52 @return the OID of the tuple just fetched with
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53 <code>fetchNext</code>
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54 */
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55 public OID getOID() {
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56 return theCurrent;
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57 }
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58
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59 /**
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60 When you've finished with the TupleLocator instance, call release.
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61 */
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62 public void release() throws IOException {
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63 // System.out.println("Iterated: " + theIndex);
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64 }
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65 }