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annotate lucene/src/luan/modules/lucene/Lucene.luan @ 312:d34be4588556

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add lucene query parsing git-svn-id: https://luan-java.googlecode.com/svn/trunk@313 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 24 Dec 2014 11:15:27 +0000
parents fdb4bd391c28
children fed1893821bf
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1 java()
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2 import "luan:Table"
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3 import "java:luan.modules.lucene.LuceneIndex"
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4 import "java:org.apache.lucene.index.Term"
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5 import "java:org.apache.lucene.search.TermQuery"
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6 import "java:org.apache.lucene.search.MatchAllDocsQuery"
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7 import "java:org.apache.lucene.search.BooleanQuery"
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8 import "java:org.apache.lucene.search.BooleanClause"
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9 import "java:org.apache.lucene.search.Sort"
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10 import "java:org.apache.lucene.search.SortField"
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13 function Index(indexDir)
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14 local index = {}
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15 local java_index = LuceneIndex.new(indexDir)
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16 index.fields = java_index.fields
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17 index.to_string = java_index.to_string
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18 index.backup = java_index.backup
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19 index.Writer = java_index.Writer
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20 index.Searcher = java_index.Searcher
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21 index.delete_all = java_index.delete_all
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22 index.map_field_name = java_index.map_field_name
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23 index.close = java_index.close
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25 function index.save_document(doc)
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26 index.Writer( function(writer)
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27 writer.save_document(doc)
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28 end )
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29 end
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31 function index.delete_documents(terms)
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32 index.Writer( function(writer)
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33 writer.delete_documents(terms)
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34 end )
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35 end
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36
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37 function index.get_first(query, sort)
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38 return index.Searcher( function(searcher)
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39 local results, _, total_hits = searcher.search(query,1,sort)
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40 return results(), total_hits
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41 end )
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42 end
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44 function index.get_document(query)
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45 local doc, total_hits = index.get_first(query);
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46 if total_hits > 1 then
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47 error( "found " .. total_hits .. " documents" )
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48 end
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49 return doc
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50 end
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51
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52 function index.count(query)
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53 return index.Searcher( function(searcher)
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54 local _, _, total_hits = searcher.search(query,0)
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55 return total_hits
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56 end )
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57 end
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58
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61 local Query = {}
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62 index.Query = Query
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63
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64 Query.parse = java_index.parse
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65
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66 Query.all_docs = MatchAllDocsQuery.new()
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67
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68 function Query.term(t)
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69 local iter = pairs(t)
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70 local field, value = iter()
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71 field and value or error "missing term"
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72 iter()==nil or error "only one term allowed"
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73 field = index.map_field_name(field)
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74 return TermQuery.new(Term.new(field,value))
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75 end
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77 function Query.boolean(t)
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78 local boolean_query = BooleanQuery.new()
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79 for query, occur_string in pairs(t) do
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80 local occur = BooleanClause.Occur.valueOf( occur_string.upper() )
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81 boolean_query.add( query, occur )
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82 end
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83 return boolean_query
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84 end
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85
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86 -- and list
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87 function Query.all(t)
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88 local bt = {}
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89 for key, query in pairs(t) do
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90 if type(key)=="string" then
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91 query = Query.term{[key]=query}
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92 end
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93 bt[query] = "MUST"
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94 end
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95 return Query.boolean(bt)
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96 end
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97
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98 -- or list
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99 function Query.any(t)
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100 local bt = {}
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101 for key, query in pairs(t) do
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102 if type(key)=="string" then
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103 query = Query.term{[key]=query}
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104 end
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105 bt[query] = "SHOULD"
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106 end
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107 return Query.boolean(bt)
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108 end
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109
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110
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111 function Query.sort(fields)
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112 #fields > 0 or error "list of sort fields expected"
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113 local a = {}
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114 for _, f in ipairs(fields) do
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115 f.field or error "missing sort field"
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116 f.type or error "missing sort type"
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117 local type = SortField.Type.valueOf( f.type.upper() )
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118 local reverse = f.reverse or false
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119 a[#a+1] = SortField.new(f.field,type,reverse)
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120 end
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121 return Sort.new(Table.unpack(a))
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122 end
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123
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124
230
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125 return index
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126 end