Mercurial Hosting > luan
annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 257:c5c60eca33dd
allow Lucene search for 0 rows
git-svn-id: https://luan-java.googlecode.com/svn/trunk@258 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 28 Oct 2014 03:05:37 +0000 |
parents | b25feac318d8 |
children | 8afe9f2fdfec |
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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.TotalHitCountCollector; |
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20 import luan.Luan; |
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21 import luan.LuanState; |
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22 import luan.LuanTable; |
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23 import luan.LuanFunction; |
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24 import luan.LuanJavaFunction; |
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25 import luan.LuanException; |
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26 |
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27 |
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28 public final class LuceneSearcher { |
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29 private final LuceneIndex index; |
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30 private final IndexSearcher searcher; |
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31 |
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32 LuceneSearcher(LuceneIndex index,IndexReader reader) { |
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33 this.index = index; |
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34 this.searcher = new IndexSearcher(reader); |
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35 } |
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36 |
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37 // call in finally block |
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38 void close() throws IOException { |
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39 searcher.getIndexReader().decRef(); |
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40 } |
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41 |
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42 LuanTable doc(LuanState luan,int docID) throws LuanException, IOException { |
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43 return index.toTable(luan,searcher.doc(docID)); |
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44 } |
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45 |
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46 TopDocs search(Query query,int n) throws IOException { |
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47 return searcher.search(query,n); |
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48 } |
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49 |
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50 TopFieldDocs search(Query query,int n,Sort sort) throws IOException { |
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51 return searcher.search(query,n,sort); |
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52 } |
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53 |
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54 // luan |
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55 |
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56 private Query termQuery(LuanTable queryTbl) { |
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57 if( queryTbl.length() != 0 ) |
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58 return null; |
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59 Map<Object,Object> map = queryTbl.asMap(); |
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60 if( map.size() != 1 ) |
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61 return null; |
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62 Map.Entry<Object,Object> entry = map.entrySet().iterator().next(); |
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63 Object key = entry.getKey(); |
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64 Object value = entry.getValue(); |
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65 if( key instanceof String && value instanceof String ) { |
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66 return new TermQuery(index.newTerm( (String)key, (String)value )); |
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67 } |
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68 return null; |
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69 } |
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70 |
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71 private Query booleanQuery(LuanTable queryTbl) { |
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72 if( !queryTbl.isList() ) |
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73 return null; |
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74 List<Object> clauses = queryTbl.asList(); |
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75 BooleanQuery query = new BooleanQuery(); |
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76 for( Object obj : clauses ) { |
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77 if( !(obj instanceof LuanTable) ) |
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78 return null; |
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79 LuanTable tbl = (LuanTable)obj; |
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80 if( !(tbl.isList() && tbl.length()==2) ) |
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81 return null; |
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82 List<Object> list = tbl.asList(); |
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83 Object obj0 = list.get(0); |
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84 Object obj1 = list.get(1); |
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85 if( !(obj0 instanceof String && obj1 instanceof LuanTable) ) |
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86 return null; |
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87 BooleanClause.Occur occur; |
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88 try { |
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89 occur = BooleanClause.Occur.valueOf( ((String)obj0).toUpperCase() ); |
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90 } catch(IllegalArgumentException e) { |
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91 return null; |
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92 } |
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93 Query subQuery = query( (LuanTable)obj1 ); |
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94 if( subQuery == null ) |
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95 return null; |
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96 query.add(subQuery,occur); |
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97 } |
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98 return query; |
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99 } |
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100 |
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101 private Query query(LuanTable queryTbl) { |
233
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102 if( queryTbl.isEmpty() ) |
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103 return null; |
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104 Query query; |
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105 query = termQuery(queryTbl); if(query!=null) return query; |
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106 query = booleanQuery(queryTbl); if(query!=null) return query; |
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107 return null; |
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108 } |
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109 |
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110 private SortField sortField(LuanState luan,List<Object> list,String pos) throws LuanException { |
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111 int size = list.size(); |
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112 if( size < 2 || size > 3 ) |
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113 throw luan.exception("invalid sort field"+pos); |
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114 Object obj0 = list.get(0); |
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115 Object obj1 = list.get(1); |
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116 if( !(obj0 instanceof String && obj1 instanceof String) ) |
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117 throw luan.exception("invalid sort field"+pos); |
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118 String field = (String)obj0; |
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119 field = index.fixFieldName(field); |
232
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120 SortField.Type type; |
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121 try { |
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122 type = SortField.Type.valueOf( ((String)obj1).toUpperCase() ); |
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123 } catch(IllegalArgumentException e) { |
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124 throw luan.exception("invalid sort field type"+pos); |
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125 } |
232
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126 if( size == 2 ) |
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127 return new SortField(field,type); |
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128 Object obj2 = list.get(2); |
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129 if( !(obj2 instanceof String) ) |
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130 throw luan.exception("invalid sort field"+pos+", order must be 'ascending' or 'descending'"); |
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131 String order = (String)obj2; |
234
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132 boolean reverse; |
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133 if( order.equalsIgnoreCase("ascending") ) |
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134 reverse = false; |
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135 else if( order.equalsIgnoreCase("descending") ) |
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136 reverse = true; |
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137 else |
233
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138 throw luan.exception("invalid sort field"+pos+", order must be 'ascending' or 'descending'"); |
234
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139 return new SortField( field, type, reverse ); |
230
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140 } |
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141 |
232
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142 private Sort sort(LuanState luan,LuanTable sortTbl) throws LuanException { |
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143 if( !sortTbl.isList() ) |
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144 throw luan.exception("invalid sort, must be list"); |
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145 List<Object> list = sortTbl.asList(); |
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146 if( list.isEmpty() ) |
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147 throw luan.exception("sort cannot be empty"); |
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148 if( list.get(0) instanceof String ) |
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149 return new Sort(sortField(luan,list,"")); |
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150 SortField[] flds = new SortField[list.size()]; |
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151 for( int i=0; i<flds.length; i++ ) { |
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152 Object obj = list.get(i); |
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153 if( !(obj instanceof LuanTable) ) |
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154 throw luan.exception("invalid sort parameter at position "+(i+1)); |
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155 LuanTable fldTbl = (LuanTable)obj; |
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156 if( !fldTbl.isList() ) |
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157 throw luan.exception("invalid sort field at position "+(i+1)+", must be list"); |
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158 flds[i] = sortField(luan,fldTbl.asList()," at position "+(i+1)); |
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159 } |
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160 return new Sort(flds); |
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161 } |
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162 |
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163 private static final LuanFunction nothingFn = new LuanFunction() { |
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164 @Override public Object call(LuanState luan,Object[] args) { |
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165 return LuanFunction.NOTHING; |
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166 } |
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167 }; |
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168 |
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169 public Object[] search( LuanState luan, LuanTable queryTbl, int n, LuanTable sortTbl ) throws LuanException, IOException { |
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170 Query query = query(queryTbl); |
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171 if( query == null ) |
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172 throw luan.exception("invalid query"); |
257
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173 if( n==0 ) { |
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174 TotalHitCountCollector thcc = new TotalHitCountCollector(); |
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175 searcher.search(query,thcc); |
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176 return new Object[]{ nothingFn, 0, thcc.getTotalHits() }; |
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177 } |
232
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178 TopDocs td = sortTbl==null ? searcher.search(query,n) : searcher.search(query,n,sort(luan,sortTbl)); |
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179 final ScoreDoc[] scoreDocs = td.scoreDocs; |
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180 LuanFunction results = new LuanFunction() { |
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181 int i = 0; |
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182 |
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183 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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184 if( i >= scoreDocs.length ) |
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185 return LuanFunction.NOTHING; |
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186 try { |
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187 LuanTable doc = doc(luan,scoreDocs[i++].doc); |
232
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188 return doc; |
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189 } catch(IOException e) { |
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190 throw luan.exception(e); |
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191 } |
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192 } |
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193 }; |
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194 return new Object[]{ results, scoreDocs.length, td.totalHits }; |
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195 } |
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196 |
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197 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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198 t.put( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) ); |
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199 } |
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200 |
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201 LuanTable table() { |
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202 LuanTable tbl = Luan.newTable(); |
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203 try { |
232
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204 add( tbl, "search", LuanState.class, LuanTable.class, Integer.TYPE, LuanTable.class ); |
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205 } catch(NoSuchMethodException e) { |
230
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206 throw new RuntimeException(e); |
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207 } |
232
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208 return tbl; |
230
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209 } |
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210 |
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211 } |