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comparison 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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1 package org.dancres.blitz.entry.ci;
2
3 import java.io.IOException;
4
5 import org.dancres.blitz.oid.OID;
6
7 import org.dancres.blitz.entry.TupleLocator;
8
9 import org.dancres.struct.BitIndex;
10 import org.dancres.struct.BitVisitor;
11
12 /**
13 Used by CacheIndexer.
14 */
15 class BitLocatorImpl implements TupleLocator {
16 private BitVisitor theHits;
17 private OID[] theOIDs;
18 private int theIndex = 0;
19 private OID theCurrent;
20
21 BitLocatorImpl(BitIndex aHits, OID[] aListOfOIDs, boolean hitOnZero) {
22 theOIDs = aListOfOIDs;
23 theHits = aHits.getVisitor(hitOnZero);
24 }
25
26 /**
27 Invoke this to load the next matching Tuple.
28
29 @return <code>true</code> if there was a tuple, <code>false</code>
30 otherwise
31 */
32 public boolean fetchNext() throws IOException {
33 int myNext;
34
35 while ((myNext = theHits.getNext()) != -1) {
36 theCurrent = (OID) theOIDs[myNext];
37
38 if (theCurrent != null)
39 return true;
40 else {
41 /*
42 System.err.println("There should've been a OID here: " +
43 myNext);
44 */
45 }
46 }
47
48 return false;
49 }
50
51 /**
52 @return the OID of the tuple just fetched with
53 <code>fetchNext</code>
54 */
55 public OID getOID() {
56 return theCurrent;
57 }
58
59 /**
60 When you've finished with the TupleLocator instance, call release.
61 */
62 public void release() throws IOException {
63 // System.out.println("Iterated: " + theIndex);
64 }
65 }