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annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 544:c5a93767cc5c

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lucene overhaul, untested
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 12 Jun 2015 19:11:44 -0600
parents 5d4a78c93383
children
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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 sane.lucene.queryparser.ParseException;
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25 import luan.Luan;
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26 import luan.LuanState;
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27 import luan.LuanTable;
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28 import luan.LuanFunction;
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29 import luan.LuanJavaFunction;
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30 import luan.LuanException;
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31 import luan.LuanRuntimeException;
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32 import luan.LuanMethod;
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33 import luan.modules.Utils;
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36 public final class LuceneSearcher {
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37 private final LuceneIndex index;
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38 final IndexSearcher searcher;
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39
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40 LuceneSearcher(LuceneIndex index,IndexReader reader) {
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41 this.index = index;
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42 this.searcher = new IndexSearcher(reader);
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43 }
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45 // call in finally block
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46 void close() throws IOException {
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47 searcher.getIndexReader().decRef();
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48 }
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49
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50 private LuanTable doc(LuanState luan,int docID) throws LuanException, IOException {
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51 return LuceneDocument.toTable(luan,searcher.doc(docID));
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52 }
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53 /*
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54 TopDocs search(Query query,int n) throws IOException {
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55 return searcher.search(query,n);
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56 }
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57
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58 TopFieldDocs search(Query query,int n,Sort sort) throws IOException {
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59 return searcher.search(query,n,sort);
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60 }
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61 */
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62 // luan
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63
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64 private static final LuanFunction nothingFn = new LuanFunction() {
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65 @Override public Object call(LuanState luan,Object[] args) {
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66 return LuanFunction.NOTHING;
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67 }
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68 };
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69
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70 private static abstract class MyCollector extends Collector {
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71 int docBase;
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72
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73 @Override public void setScorer(Scorer scorer) {}
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74 @Override public void setNextReader(AtomicReaderContext context) {
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75 this.docBase = context.docBase;
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76 }
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77 @Override public boolean acceptsDocsOutOfOrder() {
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78 return true;
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79 }
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80 }
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81
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82 @LuanMethod public Object[] search( final LuanState luan, String queryStr, Object nObj, String sortStr ) throws LuanException, IOException, ParseException {
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83 Utils.checkNotNull(luan,queryStr);
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84 Query query = index.parseQuery(queryStr);
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85 if( nObj instanceof LuanFunction ) {
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86 final LuanFunction fn = (LuanFunction)nObj;
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87 Collector col = new MyCollector() {
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88 @Override public void collect(int doc) {
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89 try {
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90 try {
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91 LuanTable docTbl = doc(luan,docBase+doc);
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92 luan.call(fn,new Object[]{docTbl});
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93 } catch(IOException e) {
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94 throw luan.exception(e);
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95 }
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96 } catch(LuanException e) {
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97 throw new LuanRuntimeException(e);
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98 }
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99 }
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100 };
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101 try {
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102 searcher.search(query,col);
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103 } catch(LuanRuntimeException e) {
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104 throw (LuanException)e.getCause();
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105 }
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106 return LuanFunction.NOTHING;
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107 }
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108 Integer nI = Luan.asInteger(nObj);
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109 if( nI == null )
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110 throw luan.exception("bad argument #2 (integer or function expected, got "+Luan.type(nObj)+")");
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111 int n = nI;
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112 if( n==0 ) {
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113 TotalHitCountCollector thcc = new TotalHitCountCollector();
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114 searcher.search(query,thcc);
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115 return new Object[]{ nothingFn, 0, thcc.getTotalHits() };
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116 }
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117 Sort sort = sortStr==null ? null : index.parseSort(sortStr);
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118 TopDocs td = sort==null ? searcher.search(query,n) : searcher.search(query,n,sort);
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119 final ScoreDoc[] scoreDocs = td.scoreDocs;
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120 LuanFunction results = new LuanFunction() {
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121 int i = 0;
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122
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123 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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124 if( i >= scoreDocs.length )
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125 return LuanFunction.NOTHING;
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126 try {
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127 LuanTable doc = doc(luan,scoreDocs[i++].doc);
232
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128 return doc;
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129 } catch(IOException e) {
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130 throw luan.exception(e);
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131 }
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132 }
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133 };
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134 return new Object[]{ results, scoreDocs.length, td.totalHits };
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135 }
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136
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137 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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138 t.rawPut( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) );
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139 }
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140
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141 LuanTable table() {
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142 LuanTable tbl = new LuanTable();
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143 try {
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144 add( tbl, "search", LuanState.class, String.class, Object.class, String.class );
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145 } catch(NoSuchMethodException e) {
230
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146 throw new RuntimeException(e);
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147 }
232
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148 return tbl;
230
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149 }
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150
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151 }