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annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 287:4d53e9fc1bd9

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change lucene search to take lucene objects git-svn-id: https://luan-java.googlecode.com/svn/trunk@288 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 04 Dec 2014 09:27:20 +0000
parents 582e8db4cdb6
children a35d1177bbf0
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1 package luan.modules.lucene;
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3 import java.io.IOException;
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4 import java.util.NoSuchElementException;
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5 import java.util.Map;
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6 import java.util.List;
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7 import org.apache.lucene.index.IndexReader;
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8 import org.apache.lucene.index.Term;
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9 import org.apache.lucene.search.IndexSearcher;
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10 import org.apache.lucene.search.Query;
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11 import org.apache.lucene.search.TopDocs;
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12 import org.apache.lucene.search.TopFieldDocs;
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13 import org.apache.lucene.search.Sort;
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14 import org.apache.lucene.search.SortField;
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15 import org.apache.lucene.search.ScoreDoc;
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16 import org.apache.lucene.search.TermQuery;
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17 import org.apache.lucene.search.BooleanQuery;
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18 import org.apache.lucene.search.BooleanClause;
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19 import org.apache.lucene.search.Collector;
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20 import org.apache.lucene.search.TotalHitCountCollector;
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21 import org.apache.lucene.search.Scorer;
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22 import org.apache.lucene.search.MatchAllDocsQuery;
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23 import org.apache.lucene.index.AtomicReaderContext;
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24 import luan.Luan;
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25 import luan.LuanState;
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26 import luan.LuanTable;
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27 import luan.LuanFunction;
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28 import luan.LuanJavaFunction;
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29 import luan.LuanException;
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30 import luan.LuanRuntimeException;
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33 public final class LuceneSearcher {
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34 private final LuceneIndex index;
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35 private final IndexSearcher searcher;
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36
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37 LuceneSearcher(LuceneIndex index,IndexReader reader) {
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38 this.index = index;
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39 this.searcher = new IndexSearcher(reader);
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40 }
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42 // call in finally block
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43 void close() throws IOException {
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44 searcher.getIndexReader().decRef();
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45 }
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46
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47 LuanTable doc(LuanState luan,int docID) throws LuanException, IOException {
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48 return index.toTable(luan,searcher.doc(docID));
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49 }
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51 TopDocs search(Query query,int n) throws IOException {
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52 return searcher.search(query,n);
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53 }
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54
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55 TopFieldDocs search(Query query,int n,Sort sort) throws IOException {
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56 return searcher.search(query,n,sort);
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57 }
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59 // luan
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60
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61 private static final LuanFunction nothingFn = new LuanFunction() {
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62 @Override public Object call(LuanState luan,Object[] args) {
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63 return LuanFunction.NOTHING;
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64 }
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65 };
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66
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67 private static abstract class MyCollector extends Collector {
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68 @Override public void setScorer(Scorer scorer) {}
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69 @Override public void setNextReader(AtomicReaderContext context) {}
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70 @Override public boolean acceptsDocsOutOfOrder() {
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71 return true;
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72 }
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73 }
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74
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75 public Object[] search( final LuanState luan, Query query, Object nObj, Sort sort ) throws LuanException, IOException {
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76 if( nObj instanceof LuanFunction ) {
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77 final LuanFunction fn = (LuanFunction)nObj;
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78 Collector col = new MyCollector() {
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79 @Override public void collect(int doc) {
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80 try {
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81 LuanTable docTbl = doc(luan,doc);
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82 luan.call(fn,new Object[]{docTbl});
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83 } catch(LuanException e) {
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84 throw new LuanRuntimeException(e);
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85 } catch(IOException e) {
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86 throw new LuanRuntimeException(luan.exception(e));
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87 }
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88 }
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89 };
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90 try {
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91 searcher.search(query,col);
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92 } catch(LuanRuntimeException e) {
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93 throw (LuanException)e.getCause();
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94 }
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95 return LuanFunction.NOTHING;
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96 }
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97 Integer nI = Luan.asInteger(nObj);
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98 if( nI == null )
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99 throw luan.exception("bad argument #2 (integer or function expected, got "+Luan.type(nObj)+")");
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100 int n = nI;
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101 if( n==0 ) {
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102 TotalHitCountCollector thcc = new TotalHitCountCollector();
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103 searcher.search(query,thcc);
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104 return new Object[]{ nothingFn, 0, thcc.getTotalHits() };
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105 }
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106 TopDocs td = sort==null ? searcher.search(query,n) : searcher.search(query,n,sort);
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107 final ScoreDoc[] scoreDocs = td.scoreDocs;
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108 LuanFunction results = new LuanFunction() {
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109 int i = 0;
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110
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111 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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112 if( i >= scoreDocs.length )
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113 return LuanFunction.NOTHING;
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114 try {
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115 LuanTable doc = doc(luan,scoreDocs[i++].doc);
232
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116 return doc;
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117 } catch(IOException e) {
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118 throw luan.exception(e);
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119 }
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120 }
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121 };
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122 return new Object[]{ results, scoreDocs.length, td.totalHits };
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123 }
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124
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125 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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126 t.put( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) );
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127 }
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128
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129 LuanTable table() {
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130 LuanTable tbl = Luan.newTable();
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131 try {
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132 add( tbl, "search", LuanState.class, Query.class, Object.class, Sort.class );
232
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133 } catch(NoSuchMethodException e) {
230
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134 throw new RuntimeException(e);
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135 }
232
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136 return tbl;
230
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137 }
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138
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139 }