Mercurial > hg > blitz_condensed
diff src/org/dancres/blitz/entry/ci/FifoCacheLineLocatorImpl.java @ 0:3dc0c5604566
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 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/blitz/entry/ci/FifoCacheLineLocatorImpl.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,52 @@ +package org.dancres.blitz.entry.ci; + +import java.io.IOException; + +import org.dancres.blitz.oid.OID; + +import org.dancres.blitz.entry.TupleLocator; + +/** + Used by CacheIndexer. + */ +class FifoCacheLineLocatorImpl implements TupleLocator { + private Object[] theOIDs; + private FifoCacheLine theCacheLine; + + private int theIndex = 0; + private OID theCurrent; + + FifoCacheLineLocatorImpl(Object[] aListOfOIDs, FifoCacheLine aCacheLine) { + theOIDs = aListOfOIDs; + theCacheLine = aCacheLine; + } + + /** + 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 { + if (theIndex >= theOIDs.length) + return false; + + theCurrent = (OID) theOIDs[theIndex++]; + return true; + } + + /** + @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); + } +}