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annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 234:b25feac318d8

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add lucene jar and minor changes git-svn-id: https://luan-java.googlecode.com/svn/trunk@235 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 02 Oct 2014 20:08:39 +0000
parents ef39bc4d3f70
children c5c60eca33dd
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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 luan.Luan;
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20 import luan.LuanState;
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21 import luan.LuanTable;
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22 import luan.LuanFunction;
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23 import luan.LuanJavaFunction;
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24 import luan.LuanException;
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27 public final class LuceneSearcher {
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28 private final LuceneIndex index;
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29 private final IndexSearcher searcher;
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30
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31 LuceneSearcher(LuceneIndex index,IndexReader reader) {
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32 this.index = index;
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33 this.searcher = new IndexSearcher(reader);
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34 }
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36 // call in finally block
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37 void close() throws IOException {
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38 searcher.getIndexReader().decRef();
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39 }
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40
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41 LuanTable doc(LuanState luan,int docID) throws LuanException, IOException {
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42 return index.toTable(luan,searcher.doc(docID));
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43 }
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45 TopDocs search(Query query,int n) throws IOException {
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46 return searcher.search(query,n);
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47 }
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48
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49 TopFieldDocs search(Query query,int n,Sort sort) throws IOException {
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50 return searcher.search(query,n,sort);
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51 }
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53 // luan
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54
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55 private Query termQuery(LuanTable queryTbl) {
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56 if( queryTbl.length() != 0 )
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57 return null;
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58 Map<Object,Object> map = queryTbl.asMap();
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59 if( map.size() != 1 )
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60 return null;
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61 Map.Entry<Object,Object> entry = map.entrySet().iterator().next();
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62 Object key = entry.getKey();
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63 Object value = entry.getValue();
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64 if( key instanceof String && value instanceof String ) {
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65 return new TermQuery(index.newTerm( (String)key, (String)value ));
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66 }
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67 return null;
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68 }
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69
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70 private Query booleanQuery(LuanTable queryTbl) {
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71 if( !queryTbl.isList() )
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72 return null;
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73 List<Object> clauses = queryTbl.asList();
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74 BooleanQuery query = new BooleanQuery();
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75 for( Object obj : clauses ) {
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76 if( !(obj instanceof LuanTable) )
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77 return null;
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78 LuanTable tbl = (LuanTable)obj;
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79 if( !(tbl.isList() && tbl.length()==2) )
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80 return null;
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81 List<Object> list = tbl.asList();
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82 Object obj0 = list.get(0);
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83 Object obj1 = list.get(1);
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84 if( !(obj0 instanceof String && obj1 instanceof LuanTable) )
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85 return null;
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86 BooleanClause.Occur occur;
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87 try {
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88 occur = BooleanClause.Occur.valueOf( ((String)obj0).toUpperCase() );
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89 } catch(IllegalArgumentException e) {
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90 return null;
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91 }
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92 Query subQuery = query( (LuanTable)obj1 );
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93 if( subQuery == null )
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94 return null;
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95 query.add(subQuery,occur);
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96 }
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97 return query;
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98 }
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99
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100 private Query query(LuanTable queryTbl) {
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101 if( queryTbl.isEmpty() )
232
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102 return null;
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103 Query query;
233
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104 query = termQuery(queryTbl); if(query!=null) return query;
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105 query = booleanQuery(queryTbl); if(query!=null) return query;
232
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106 return null;
230
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107 }
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108
232
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109 private SortField sortField(LuanState luan,List<Object> list,String pos) throws LuanException {
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110 int size = list.size();
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111 if( size < 2 || size > 3 )
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112 throw luan.exception("invalid sort field"+pos);
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113 Object obj0 = list.get(0);
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114 Object obj1 = list.get(1);
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115 if( !(obj0 instanceof String && obj1 instanceof String) )
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116 throw luan.exception("invalid sort field"+pos);
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117 String field = (String)obj0;
233
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118 field = index.fixFieldName(field);
232
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119 SortField.Type type;
230
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120 try {
232
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121 type = SortField.Type.valueOf( ((String)obj1).toUpperCase() );
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122 } catch(IllegalArgumentException e) {
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123 throw luan.exception("invalid sort field type"+pos);
230
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124 }
232
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125 if( size == 2 )
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126 return new SortField(field,type);
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127 Object obj2 = list.get(2);
233
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128 if( !(obj2 instanceof String) )
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129 throw luan.exception("invalid sort field"+pos+", order must be 'ascending' or 'descending'");
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130 String order = (String)obj2;
234
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131 boolean reverse;
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132 if( order.equalsIgnoreCase("ascending") )
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133 reverse = false;
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134 else if( order.equalsIgnoreCase("descending") )
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135 reverse = true;
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136 else
233
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137 throw luan.exception("invalid sort field"+pos+", order must be 'ascending' or 'descending'");
234
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138 return new SortField( field, type, reverse );
230
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139 }
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140
232
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141 private Sort sort(LuanState luan,LuanTable sortTbl) throws LuanException {
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142 if( !sortTbl.isList() )
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143 throw luan.exception("invalid sort, must be list");
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144 List<Object> list = sortTbl.asList();
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145 if( list.isEmpty() )
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146 throw luan.exception("sort cannot be empty");
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147 if( list.get(0) instanceof String )
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148 return new Sort(sortField(luan,list,""));
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149 SortField[] flds = new SortField[list.size()];
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150 for( int i=0; i<flds.length; i++ ) {
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151 Object obj = list.get(i);
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152 if( !(obj instanceof LuanTable) )
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153 throw luan.exception("invalid sort parameter at position "+(i+1));
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154 LuanTable fldTbl = (LuanTable)obj;
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155 if( !fldTbl.isList() )
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156 throw luan.exception("invalid sort field at position "+(i+1)+", must be list");
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157 flds[i] = sortField(luan,fldTbl.asList()," at position "+(i+1));
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158 }
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159 return new Sort(flds);
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160 }
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161
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162 public Object[] search( LuanState luan, LuanTable queryTbl, int n, LuanTable sortTbl ) throws LuanException, IOException {
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163 Query query = query(queryTbl);
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164 if( query == null )
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165 throw luan.exception("invalid query");
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166 TopDocs td = sortTbl==null ? searcher.search(query,n) : searcher.search(query,n,sort(luan,sortTbl));
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167 final ScoreDoc[] scoreDocs = td.scoreDocs;
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168 LuanFunction results = new LuanFunction() {
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169 int i = 0;
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170
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171 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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172 if( i >= scoreDocs.length )
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173 return LuanFunction.NOTHING;
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174 try {
233
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175 LuanTable doc = doc(luan,scoreDocs[i++].doc);
232
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176 return doc;
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177 } catch(IOException e) {
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178 throw luan.exception(e);
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179 }
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180 }
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181 };
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182 return new Object[]{ results, scoreDocs.length, td.totalHits };
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183 }
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184
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185 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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186 t.put( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) );
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187 }
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188
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189 LuanTable table() {
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190 LuanTable tbl = Luan.newTable();
230
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191 try {
232
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192 add( tbl, "search", LuanState.class, LuanTable.class, Integer.TYPE, LuanTable.class );
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193 } catch(NoSuchMethodException e) {
230
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194 throw new RuntimeException(e);
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195 }
232
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196 return tbl;
230
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197 }
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198
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199 }