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annotate lucene/src/luan/modules/lucene/Lucene.luan @ 320:fed1893821bf

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remove global namespace git-svn-id: https://luan-java.googlecode.com/svn/trunk@321 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 06 Feb 2015 21:54:41 +0000
parents d34be4588556
children 7f7708e8fdd4
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1 java
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2 import "luan:Luan"
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3 import "luan:Table"
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4 import "java:luan.modules.lucene.LuceneIndex"
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5 import "java:org.apache.lucene.index.Term"
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6 import "java:org.apache.lucene.search.TermQuery"
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7 import "java:org.apache.lucene.search.MatchAllDocsQuery"
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8 import "java:org.apache.lucene.search.BooleanQuery"
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9 import "java:org.apache.lucene.search.BooleanClause"
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10 import "java:org.apache.lucene.search.Sort"
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11 import "java:org.apache.lucene.search.SortField"
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12
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13 local pairs = Luan.pairs
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14
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16 function Index(indexDir)
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17 local index = {}
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18 local java_index = LuceneIndex.new(indexDir)
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19 index.fields = java_index.fields
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20 index.to_string = java_index.to_string
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21 index.backup = java_index.backup
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22 index.Writer = java_index.Writer
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23 index.Searcher = java_index.Searcher
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24 index.delete_all = java_index.delete_all
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25 index.map_field_name = java_index.map_field_name
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26 index.close = java_index.close
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28 function index.save_document(doc)
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29 index.Writer( function(writer)
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30 writer.save_document(doc)
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31 end )
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32 end
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34 function index.delete_documents(terms)
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35 index.Writer( function(writer)
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36 writer.delete_documents(terms)
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37 end )
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38 end
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39
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40 function index.get_first(query, sort)
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41 return index.Searcher( function(searcher)
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42 local results, _, total_hits = searcher.search(query,1,sort)
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43 return results(), total_hits
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44 end )
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45 end
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47 function index.get_document(query)
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48 local doc, total_hits = index.get_first(query);
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49 if total_hits > 1 then
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50 error( "found " .. total_hits .. " documents" )
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51 end
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52 return doc
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53 end
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54
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55 function index.count(query)
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56 return index.Searcher( function(searcher)
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57 local _, _, total_hits = searcher.search(query,0)
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58 return total_hits
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59 end )
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60 end
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61
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64 local Query = {}
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65 index.Query = Query
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66
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67 Query.parse = java_index.parse
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68
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69 Query.all_docs = MatchAllDocsQuery.new()
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70
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71 function Query.term(t)
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72 local iter = pairs(t)
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73 local field, value = iter()
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74 field and value or error "missing term"
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75 iter()==nil or error "only one term allowed"
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76 field = index.map_field_name(field)
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77 return TermQuery.new(Term.new(field,value))
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78 end
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79
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80 function Query.boolean(t)
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81 local boolean_query = BooleanQuery.new()
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82 for query, occur_string in pairs(t) do
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83 local occur = BooleanClause.Occur.valueOf( occur_string.upper() )
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84 boolean_query.add( query, occur )
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85 end
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86 return boolean_query
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87 end
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88
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89 -- and list
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90 function Query.all(t)
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91 local bt = {}
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92 for key, query in pairs(t) do
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93 if type(key)=="string" then
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94 query = Query.term{[key]=query}
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95 end
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96 bt[query] = "MUST"
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97 end
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98 return Query.boolean(bt)
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99 end
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100
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101 -- or list
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102 function Query.any(t)
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103 local bt = {}
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104 for key, query in pairs(t) do
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105 if type(key)=="string" then
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106 query = Query.term{[key]=query}
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107 end
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108 bt[query] = "SHOULD"
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109 end
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110 return Query.boolean(bt)
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111 end
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112
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113
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114 function Query.sort(fields)
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115 #fields > 0 or error "list of sort fields expected"
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116 local a = {}
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117 for _, f in ipairs(fields) do
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118 f.field or error "missing sort field"
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119 f.type or error "missing sort type"
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120 local type = SortField.Type.valueOf( f.type.upper() )
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121 local reverse = f.reverse or false
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122 a[#a+1] = SortField.new(f.field,type,reverse)
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123 end
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124 return Sort.new(Table.unpack(a))
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125 end
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126
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127
230
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128 return index
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129 end