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annotate lucene/src/luan/modules/lucene/LuceneSearcher.java @ 232:9ce18106f95a

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more lucene work git-svn-id: https://luan-java.googlecode.com/svn/trunk@233 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 01 Oct 2014 06:55:14 +0000
parents 4438cb2e04d0
children ef39bc4d3f70
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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 IndexSearcher searcher;
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30 LuceneSearcher(IndexReader reader) {
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31 this.searcher = new IndexSearcher(reader);
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32 }
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34 // call in finally block
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35 void close() {
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36 try {
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37 searcher.getIndexReader().decRef();
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38 } catch(IOException e) {
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39 throw new RuntimeException(e);
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40 }
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41 }
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42
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43 public LuanTable doc(int docID) throws IOException {
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44 return LuceneDocument.toTable(searcher.doc(docID));
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45 }
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47 TopDocs search(Query query,int n) throws IOException {
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48 return searcher.search(query,n);
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49 }
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51 TopFieldDocs search(Query query,int n,Sort sort) throws IOException {
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52 return searcher.search(query,n,sort);
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53 }
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54
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55 // luan
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56
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57 private Query termQuery(Map<Object,Object> map) {
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58 if( map.size() != 1 )
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59 return null;
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60 Map.Entry<Object,Object> entry = map.entrySet().iterator().next();
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61 Object key = entry.getKey();
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62 Object value = entry.getValue();
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63 if( key instanceof String && value instanceof String ) {
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64 return new TermQuery(new Term( (String)key, (String)value ));
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65 }
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66 return null;
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67 }
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68
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69 private Query booleanQuery(Map<Object,Object> map) {
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70 BooleanQuery query = new BooleanQuery();
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71 for( Map.Entry<Object,Object> entry : map.entrySet() ) {
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72 Object key = entry.getKey();
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73 Object value = entry.getValue();
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74 if( !(key instanceof String && value instanceof LuanTable) )
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75 return null;
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76 Query subQuery = query( (LuanTable)value );
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77 if( subQuery == null )
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78 return null;
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79 BooleanClause.Occur occur;
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80 try {
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81 occur = BooleanClause.Occur.valueOf( ((String)key).toUpperCase() );
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82 } catch(IllegalArgumentException e) {
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83 return null;
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84 }
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85 query.add(subQuery,occur);
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86 }
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87 return query;
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88 }
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89
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90 private Query query(LuanTable queryTbl) {
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91 Map<Object,Object> map = queryTbl.asMap();
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92 if( map.isEmpty() )
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93 return null;
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94 Query query;
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95 query = termQuery(map); if(query!=null) return query;
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96 query = booleanQuery(map); if(query!=null) return query;
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97 return null;
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98 }
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99
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100 private SortField sortField(LuanState luan,List<Object> list,String pos) throws LuanException {
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101 int size = list.size();
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102 if( size < 2 || size > 3 )
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103 throw luan.exception("invalid sort field"+pos);
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104 Object obj0 = list.get(0);
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105 Object obj1 = list.get(1);
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106 if( !(obj0 instanceof String && obj1 instanceof String) )
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107 throw luan.exception("invalid sort field"+pos);
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108 String field = (String)obj0;
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109 SortField.Type type;
230
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110 try {
232
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111 type = SortField.Type.valueOf( ((String)obj1).toUpperCase() );
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112 } catch(IllegalArgumentException e) {
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113 throw luan.exception("invalid sort field type"+pos);
230
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114 }
232
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115 if( size == 2 )
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116 return new SortField(field,type);
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117 Object obj2 = list.get(2);
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118 if( !(obj2 instanceof Boolean) )
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119 throw luan.exception("invalid sort field"+pos+", 'reverse' must be boolean");
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120 boolean reverse = (Boolean)obj2;
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121 return new SortField(field,type,reverse);
230
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122 }
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123
232
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124 private Sort sort(LuanState luan,LuanTable sortTbl) throws LuanException {
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125 if( !sortTbl.isList() )
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126 throw luan.exception("invalid sort, must be list");
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127 List<Object> list = sortTbl.asList();
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128 if( list.isEmpty() )
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129 throw luan.exception("sort cannot be empty");
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130 if( list.get(0) instanceof String )
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131 return new Sort(sortField(luan,list,""));
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132 SortField[] flds = new SortField[list.size()];
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133 for( int i=0; i<flds.length; i++ ) {
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134 Object obj = list.get(i);
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135 if( !(obj instanceof LuanTable) )
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136 throw luan.exception("invalid sort parameter at position "+(i+1));
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137 LuanTable fldTbl = (LuanTable)obj;
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138 if( !fldTbl.isList() )
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139 throw luan.exception("invalid sort field at position "+(i+1)+", must be list");
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140 flds[i] = sortField(luan,fldTbl.asList()," at position "+(i+1));
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141 }
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142 return new Sort(flds);
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143 }
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144
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145 public Object[] search( LuanState luan, LuanTable queryTbl, int n, LuanTable sortTbl ) throws LuanException, IOException {
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146 Query query = query(queryTbl);
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147 if( query == null )
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148 throw luan.exception("invalid query");
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149 TopDocs td = sortTbl==null ? searcher.search(query,n) : searcher.search(query,n,sort(luan,sortTbl));
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150 final ScoreDoc[] scoreDocs = td.scoreDocs;
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151 LuanFunction results = new LuanFunction() {
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152 int i = 0;
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153
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154 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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155 if( i >= scoreDocs.length )
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156 return LuanFunction.NOTHING;
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157 try {
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158 LuanTable doc = doc(scoreDocs[i++].doc);
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159 return doc;
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160 } catch(IOException e) {
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161 throw luan.exception(e);
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162 }
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163 }
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164 };
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165 return new Object[]{ results, scoreDocs.length, td.totalHits };
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166 }
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167
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168 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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169 t.put( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) );
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170 }
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171
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172 LuanTable table() {
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173 LuanTable tbl = Luan.newTable();
230
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174 try {
232
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175 add( tbl, "search", LuanState.class, LuanTable.class, Integer.TYPE, LuanTable.class );
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176 } catch(NoSuchMethodException e) {
230
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177 throw new RuntimeException(e);
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178 }
232
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179 return tbl;
230
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180 }
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181
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182 }