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annotate src/org/dancres/blitz/entry/ci/ArrayLocatorImpl.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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Dan Creswell <dan.creswell@gmail.com>
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9 /**
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10 Used by CacheIndexer.
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11 */
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12 public class ArrayLocatorImpl implements TupleLocator {
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13 private Object[] theOIDs;
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14 private int theIndex = 0;
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15 private OID theCurrent;
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16
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17 public static TupleLocator EMPTY_LOCATOR =
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18 new ArrayLocatorImpl(new OID[0]);
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19
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20 ArrayLocatorImpl(Object[] aListOfOIDs) {
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21 theOIDs = aListOfOIDs;
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22 }
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23
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24 /**
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25 Invoke this to load the next matching Tuple.
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26
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27 @return <code>true</code> if there was a tuple, <code>false</code>
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28 otherwise
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29 */
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30 public boolean fetchNext() throws IOException {
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31 if (theIndex >= theOIDs.length)
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32 return false;
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33
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34 theCurrent = (OID) theOIDs[theIndex++];
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35 return true;
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36 }
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37
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38 /**
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39 @return the OID of the tuple just fetched with
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40 <code>fetchNext</code>
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41 */
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42 public OID getOID() {
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43 return theCurrent;
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44 }
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45
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46 /**
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47 When you've finished with the TupleLocator instance, call release.
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48 */
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49 public void release() throws IOException {
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50 // System.out.println("Iterated: " + theIndex);
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51 }
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52 }