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annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 285:582e8db4cdb6

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add lucene Web_search git-svn-id: https://luan-java.googlecode.com/svn/trunk@286 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 02 Dec 2014 06:17:45 +0000
parents 8afe9f2fdfec
children 4d53e9fc1bd9
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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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50
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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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58
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59 // luan
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60
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61 private Query termQuery(LuanTable queryTbl) {
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62 if( queryTbl.length() != 0 )
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63 return null;
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64 Map<Object,Object> map = queryTbl.asMap();
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65 if( map.size() != 1 )
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66 return null;
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67 Map.Entry<Object,Object> entry = map.entrySet().iterator().next();
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68 Object key = entry.getKey();
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69 Object value = entry.getValue();
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70 if( key instanceof String && value instanceof String ) {
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71 return new TermQuery(index.newTerm( (String)key, (String)value ));
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72 }
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73 return null;
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74 }
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75
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76 private Query booleanQuery(LuanTable queryTbl) {
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77 if( !queryTbl.isList() )
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78 return null;
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79 List<Object> clauses = queryTbl.asList();
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80 BooleanQuery query = new BooleanQuery();
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81 for( Object obj : clauses ) {
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82 if( !(obj instanceof LuanTable) )
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83 return null;
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84 LuanTable tbl = (LuanTable)obj;
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85 if( !(tbl.isList() && tbl.length()==2) )
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86 return null;
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87 List<Object> list = tbl.asList();
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88 Object obj0 = list.get(0);
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89 Object obj1 = list.get(1);
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90 if( !(obj0 instanceof String && obj1 instanceof LuanTable) )
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91 return null;
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92 BooleanClause.Occur occur;
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93 try {
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94 occur = BooleanClause.Occur.valueOf( ((String)obj0).toUpperCase() );
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95 } catch(IllegalArgumentException e) {
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96 return null;
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97 }
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98 Query subQuery = query( (LuanTable)obj1 );
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99 if( subQuery == null )
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100 return null;
232
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101 query.add(subQuery,occur);
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102 }
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103 return query;
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104 }
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105
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106 private Query query(LuanTable queryTbl) {
233
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107 if( queryTbl.isEmpty() )
232
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108 return null;
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109 Query query;
233
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110 query = termQuery(queryTbl); if(query!=null) return query;
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111 query = booleanQuery(queryTbl); if(query!=null) return query;
232
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112 return null;
230
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113 }
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114
232
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115 private SortField sortField(LuanState luan,List<Object> list,String pos) throws LuanException {
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116 int size = list.size();
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117 if( size < 2 || size > 3 )
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118 throw luan.exception("invalid sort field"+pos);
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119 Object obj0 = list.get(0);
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120 Object obj1 = list.get(1);
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121 if( !(obj0 instanceof String && obj1 instanceof String) )
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122 throw luan.exception("invalid sort field"+pos);
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123 String field = (String)obj0;
233
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124 field = index.fixFieldName(field);
232
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125 SortField.Type type;
230
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126 try {
232
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127 type = SortField.Type.valueOf( ((String)obj1).toUpperCase() );
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128 } catch(IllegalArgumentException e) {
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129 throw luan.exception("invalid sort field type"+pos);
230
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130 }
232
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131 if( size == 2 )
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132 return new SortField(field,type);
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133 Object obj2 = list.get(2);
233
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134 if( !(obj2 instanceof String) )
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135 throw luan.exception("invalid sort field"+pos+", order must be 'ascending' or 'descending'");
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136 String order = (String)obj2;
234
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137 boolean reverse;
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138 if( order.equalsIgnoreCase("ascending") )
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139 reverse = false;
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140 else if( order.equalsIgnoreCase("descending") )
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141 reverse = true;
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142 else
233
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143 throw luan.exception("invalid sort field"+pos+", order must be 'ascending' or 'descending'");
234
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144 return new SortField( field, type, reverse );
230
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145 }
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146
232
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147 private Sort sort(LuanState luan,LuanTable sortTbl) throws LuanException {
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148 if( !sortTbl.isList() )
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149 throw luan.exception("invalid sort, must be list");
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150 List<Object> list = sortTbl.asList();
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151 if( list.isEmpty() )
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152 throw luan.exception("sort cannot be empty");
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153 if( list.get(0) instanceof String )
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154 return new Sort(sortField(luan,list,""));
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155 SortField[] flds = new SortField[list.size()];
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156 for( int i=0; i<flds.length; i++ ) {
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157 Object obj = list.get(i);
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158 if( !(obj instanceof LuanTable) )
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159 throw luan.exception("invalid sort parameter at position "+(i+1));
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160 LuanTable fldTbl = (LuanTable)obj;
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161 if( !fldTbl.isList() )
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162 throw luan.exception("invalid sort field at position "+(i+1)+", must be list");
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163 flds[i] = sortField(luan,fldTbl.asList()," at position "+(i+1));
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164 }
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165 return new Sort(flds);
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166 }
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167
257
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168 private static final LuanFunction nothingFn = new LuanFunction() {
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169 @Override public Object call(LuanState luan,Object[] args) {
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170 return LuanFunction.NOTHING;
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171 }
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172 };
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diff changeset
173
274
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174 private static abstract class MyCollector extends Collector {
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175 @Override public void setScorer(Scorer scorer) {}
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176 @Override public void setNextReader(AtomicReaderContext context) {}
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177 @Override public boolean acceptsDocsOutOfOrder() {
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178 return true;
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179 }
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180 }
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181
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182 public Object[] search( final LuanState luan, LuanTable queryTbl, Object nObj, LuanTable sortTbl ) throws LuanException, IOException {
285
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183 Query query;
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184 if( queryTbl == null ) {
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185 query = new MatchAllDocsQuery();
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186 } else {
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187 query = query(queryTbl);
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188 if( query == null )
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189 throw luan.exception("invalid query");
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190 }
274
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191 if( nObj instanceof LuanFunction ) {
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192 final LuanFunction fn = (LuanFunction)nObj;
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193 Collector col = new MyCollector() {
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194 @Override public void collect(int doc) {
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195 try {
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196 LuanTable docTbl = doc(luan,doc);
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197 luan.call(fn,new Object[]{docTbl});
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198 } catch(LuanException e) {
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199 throw new LuanRuntimeException(e);
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200 } catch(IOException e) {
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201 throw new LuanRuntimeException(luan.exception(e));
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202 }
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203 }
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204 };
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205 try {
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206 searcher.search(query,col);
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207 } catch(LuanRuntimeException e) {
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208 throw (LuanException)e.getCause();
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209 }
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210 return LuanFunction.NOTHING;
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211 }
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212 Integer nI = Luan.asInteger(nObj);
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213 if( nI == null )
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214 throw luan.exception("bad argument #2 (integer or function expected, got "+Luan.type(nObj)+")");
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215 int n = nI;
257
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216 if( n==0 ) {
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217 TotalHitCountCollector thcc = new TotalHitCountCollector();
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218 searcher.search(query,thcc);
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219 return new Object[]{ nothingFn, 0, thcc.getTotalHits() };
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220 }
232
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221 TopDocs td = sortTbl==null ? searcher.search(query,n) : searcher.search(query,n,sort(luan,sortTbl));
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222 final ScoreDoc[] scoreDocs = td.scoreDocs;
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223 LuanFunction results = new LuanFunction() {
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224 int i = 0;
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225
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226 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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227 if( i >= scoreDocs.length )
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228 return LuanFunction.NOTHING;
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229 try {
233
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230 LuanTable doc = doc(luan,scoreDocs[i++].doc);
232
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231 return doc;
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232 } catch(IOException e) {
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233 throw luan.exception(e);
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234 }
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235 }
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236 };
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237 return new Object[]{ results, scoreDocs.length, td.totalHits };
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238 }
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239
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240 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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241 t.put( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) );
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242 }
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243
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244 LuanTable table() {
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245 LuanTable tbl = Luan.newTable();
230
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246 try {
274
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247 add( tbl, "search", LuanState.class, LuanTable.class, Object.class, LuanTable.class );
232
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248 } catch(NoSuchMethodException e) {
230
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249 throw new RuntimeException(e);
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250 }
232
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251 return tbl;
230
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252 }
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253
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254 }