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annotate src/org/dancres/blitz/entry/SortingLocator.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;
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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 /**
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8 This locator will provide a single FIFO list of tuples created from
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9 merging the contents of all the passed locators. It assumes that each
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10 individual locator is FIFO sorted.
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11 */
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12 class SortingLocator implements TupleLocator {
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13 private TupleLocator[] theLocators;
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14
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15 private OID[] theSortBuffer;
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16
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17 private OID theNext;
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18
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19 SortingLocator(TupleLocator[] aSetOfLocators) {
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20 theLocators = aSetOfLocators;
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21 }
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22
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23 /**
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24 Invoke this to load the next matching Tuple.
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25
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26 @return <code>true</code> if there was a tuple, <code>false</code>
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27 otherwise
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28 */
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29 public boolean fetchNext() throws IOException {
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30 if (theSortBuffer == null) {
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31 // First-time init
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32 theSortBuffer = new OID[theLocators.length];
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33
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34 for (int i = 0; i < theLocators.length; i++) {
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35 boolean hasUID = theLocators[i].fetchNext();
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36
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37 if (hasUID)
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38 theSortBuffer[i] = theLocators[i].getOID();
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39 }
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40 } else {
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41 // This cannot be the first time so if theNext is null, we've
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42 // run out of matches
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43 if (theNext == null)
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44 return false;
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45
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46 // Refresh slots in the slot buffer which contain the last OID
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47 for (int i = 0; i < theSortBuffer.length; i++) {
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48 if (theSortBuffer[i] != null) {
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49 if (theSortBuffer[i].equals(theNext)) {
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50 if (theLocators[i].fetchNext())
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51 theSortBuffer[i] = theLocators[i].getOID();
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52 else
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53 theSortBuffer[i] = null;
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54 }
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55 }
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56 }
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57 }
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58
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59 OID myOldest = null;
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60
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61 for (int i = 0; i < theSortBuffer.length; i++) {
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62 if (theSortBuffer[i] != null) {
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63 if (myOldest == null) {
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64 myOldest = theSortBuffer[i];
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65 } else {
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66 if (theSortBuffer[i].compareTo(myOldest) < 0) {
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67 myOldest = theSortBuffer[i];
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68 }
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69 }
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70 }
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71 }
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72
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73 theNext = myOldest;
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74
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75 return (theNext != null);
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76 }
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77
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78 /**
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79 @return the OID of the tuple just fetched with
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80 <code>fetchNext</code>
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81 */
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82 public OID getOID() {
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83 return theNext;
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84 }
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85
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86 /**
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87 When you've finished with the TupleLocator instance, call release.
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88 */
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89 public void release() throws IOException {
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90 for (int i = 0; i < theLocators.length; i++) {
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91 theLocators[i].release();
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92 }
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93 }
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94 }