Mercurial Hosting > luan
annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 481:5d4a78c93383
luan errors are now tables
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 11 May 2015 20:26:36 -0600 |
parents | dae264ad6a7b |
children | c5a93767cc5c |
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1 package luan.modules.lucene; |
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2 |
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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 org.apache.lucene.queryparser.flexible.core.QueryNodeException; |
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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 |
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34 |
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35 public final class LuceneSearcher { |
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36 private final LuceneIndex index; |
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37 private final IndexSearcher searcher; |
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38 |
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39 LuceneSearcher(LuceneIndex index,IndexReader reader) { |
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40 this.index = index; |
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41 this.searcher = new IndexSearcher(reader); |
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42 } |
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43 |
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44 // call in finally block |
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45 void close() throws IOException { |
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46 searcher.getIndexReader().decRef(); |
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47 } |
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48 |
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49 LuanTable doc(LuanState luan,int docID) throws LuanException, IOException { |
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50 return index.toTable(luan,searcher.doc(docID)); |
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51 } |
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52 |
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53 TopDocs search(Query query,int n) throws IOException { |
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54 return searcher.search(query,n); |
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55 } |
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56 |
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57 TopFieldDocs search(Query query,int n,Sort sort) throws IOException { |
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58 return searcher.search(query,n,sort); |
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59 } |
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60 |
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61 // luan |
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62 |
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63 private static final LuanFunction nothingFn = new LuanFunction() { |
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64 @Override public Object call(LuanState luan,Object[] args) { |
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65 return LuanFunction.NOTHING; |
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66 } |
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67 }; |
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68 |
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69 private static abstract class MyCollector extends Collector { |
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70 int docBase; |
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71 |
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72 @Override public void setScorer(Scorer scorer) {} |
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73 @Override public void setNextReader(AtomicReaderContext context) { |
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74 this.docBase = context.docBase; |
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75 } |
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76 @Override public boolean acceptsDocsOutOfOrder() { |
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77 return true; |
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78 } |
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79 } |
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80 |
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81 @LuanMethod public Object[] search( final LuanState luan, Object queryObj, Object nObj, Sort sort ) throws LuanException, IOException, QueryNodeException { |
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82 Query query; |
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83 if( queryObj instanceof Query ) { |
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84 query = (Query)queryObj; |
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85 } else if( queryObj instanceof String ) { |
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86 String s = (String)queryObj; |
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87 query = index.parse(s); |
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88 } else |
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89 throw luan.exception("bad argument #1 (string or Query expected, got "+Luan.type(queryObj)+")"); |
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90 if( nObj instanceof LuanFunction ) { |
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91 final LuanFunction fn = (LuanFunction)nObj; |
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92 Collector col = new MyCollector() { |
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93 @Override public void collect(int doc) { |
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94 try { |
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95 try { |
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96 LuanTable docTbl = doc(luan,docBase+doc); |
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97 luan.call(fn,new Object[]{docTbl}); |
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98 } catch(IOException e) { |
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99 throw luan.exception(e); |
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100 } |
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101 } catch(LuanException e) { |
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102 throw new LuanRuntimeException(e); |
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103 } |
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104 } |
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105 }; |
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106 try { |
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107 searcher.search(query,col); |
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108 } catch(LuanRuntimeException e) { |
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109 throw (LuanException)e.getCause(); |
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110 } |
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111 return LuanFunction.NOTHING; |
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112 } |
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113 Integer nI = Luan.asInteger(nObj); |
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114 if( nI == null ) |
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115 throw luan.exception("bad argument #2 (integer or function expected, got "+Luan.type(nObj)+")"); |
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116 int n = nI; |
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117 if( n==0 ) { |
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118 TotalHitCountCollector thcc = new TotalHitCountCollector(); |
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119 searcher.search(query,thcc); |
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120 return new Object[]{ nothingFn, 0, thcc.getTotalHits() }; |
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121 } |
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122 TopDocs td = sort==null ? searcher.search(query,n) : searcher.search(query,n,sort); |
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123 final ScoreDoc[] scoreDocs = td.scoreDocs; |
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124 LuanFunction results = new LuanFunction() { |
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125 int i = 0; |
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126 |
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127 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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128 if( i >= scoreDocs.length ) |
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129 return LuanFunction.NOTHING; |
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130 try { |
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131 LuanTable doc = doc(luan,scoreDocs[i++].doc); |
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132 return doc; |
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133 } catch(IOException e) { |
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134 throw luan.exception(e); |
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135 } |
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136 } |
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137 }; |
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138 return new Object[]{ results, scoreDocs.length, td.totalHits }; |
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139 } |
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140 |
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141 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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142 t.rawPut( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) ); |
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143 } |
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144 |
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145 LuanTable table() { |
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146 LuanTable tbl = new LuanTable(); |
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147 try { |
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148 add( tbl, "search", LuanState.class, Object.class, Object.class, Sort.class ); |
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149 } catch(NoSuchMethodException e) { |
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150 throw new RuntimeException(e); |
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151 } |
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152 return tbl; |
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153 } |
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154 |
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155 } |