Mercurial > hg > blitz_condensed
view src/org/dancres/blitz/entry/ci/BitLocatorImpl.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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package org.dancres.blitz.entry.ci; import java.io.IOException; import org.dancres.blitz.oid.OID; import org.dancres.blitz.entry.TupleLocator; import org.dancres.struct.BitIndex; import org.dancres.struct.BitVisitor; /** Used by CacheIndexer. */ class BitLocatorImpl implements TupleLocator { private BitVisitor theHits; private OID[] theOIDs; private int theIndex = 0; private OID theCurrent; BitLocatorImpl(BitIndex aHits, OID[] aListOfOIDs, boolean hitOnZero) { theOIDs = aListOfOIDs; theHits = aHits.getVisitor(hitOnZero); } /** Invoke this to load the next matching Tuple. @return <code>true</code> if there was a tuple, <code>false</code> otherwise */ public boolean fetchNext() throws IOException { int myNext; while ((myNext = theHits.getNext()) != -1) { theCurrent = (OID) theOIDs[myNext]; if (theCurrent != null) return true; else { /* System.err.println("There should've been a OID here: " + myNext); */ } } return false; } /** @return the OID of the tuple just fetched with <code>fetchNext</code> */ public OID getOID() { return theCurrent; } /** When you've finished with the TupleLocator instance, call release. */ public void release() throws IOException { // System.out.println("Iterated: " + theIndex); } }