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annotate lucene/src/luan/modules/lucene/Lucene.luan @ 503:92c3d22745b8

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make _ENV optional
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 20 May 2015 23:24:46 -0600
parents 5b36f663a1b8
children 1b2e4c7dab85
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1 java()
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2 local Luan = require "luan:Luan"
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3 local pairs = Luan.pairs
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4 local ipairs = Luan.ipairs
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5 local type = Luan.type
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6 local error = Luan.error
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7 local Table = require "luan:Table"
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8 local LuceneIndex = require "java:luan.modules.lucene.LuceneIndex"
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9 local Term = require "java:org.apache.lucene.index.Term"
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10 local TermQuery = require "java:org.apache.lucene.search.TermQuery"
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11 local MatchAllDocsQuery = require "java:org.apache.lucene.search.MatchAllDocsQuery"
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12 local BooleanQuery = require "java:org.apache.lucene.search.BooleanQuery"
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13 local BooleanClause = require "java:org.apache.lucene.search.BooleanClause"
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14 local Sort = require "java:org.apache.lucene.search.Sort"
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15 local SortField = require "java:org.apache.lucene.search.SortField"
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16
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17 local M = {}
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18
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19 function M.index(indexDir)
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20 local index = {}
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21 local java_index = LuceneIndex.new(indexDir)
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22 index.fields = java_index.fields.newTable()
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23 index.to_string = java_index.to_string
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24 index.backup = java_index.backup
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25 index.Writer = java_index.Writer
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26 index.Searcher = java_index.Searcher
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27 index.delete_all = java_index.delete_all
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28 index.map_field_name = java_index.map_field_name
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29 index.close = java_index.close
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31 function index.save_document(doc)
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32 index.Writer( function(writer)
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33 writer.save_document(doc)
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34 end )
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35 end
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37 function index.delete_documents(terms)
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38 index.Writer( function(writer)
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39 writer.delete_documents(terms)
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40 end )
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41 end
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42
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43 function index.get_first(query, sort)
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44 return index.Searcher( function(searcher)
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45 local results, _, total_hits = searcher.search(query,1,sort)
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46 return results(), total_hits
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47 end )
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48 end
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49
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50 function index.get_document(query)
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51 local doc, total_hits = index.get_first(query);
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52 if total_hits > 1 then
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53 error( "found " .. total_hits .. " documents" )
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54 end
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55 return doc
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56 end
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57
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58 function index.count(query)
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59 return index.Searcher( function(searcher)
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60 local _, _, total_hits = searcher.search(query,0)
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61 return total_hits
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62 end )
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63 end
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64
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66
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67 local queryTbl = {}
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68 index.query = queryTbl
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70 queryTbl.parse = java_index.parse
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72 queryTbl.all_docs = MatchAllDocsQuery.new()
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74 function queryTbl.term(t)
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75 local iter = pairs(t)
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76 local field, value = iter()
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77 field and value or error "missing term"
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78 iter()==nil or error "only one term allowed"
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79 field = index.map_field_name(field)
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80 return TermQuery.new(Term.new(field,value))
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81 end
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82
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83 function queryTbl.boolean(t)
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84 local boolean_query = BooleanQuery.new()
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85 for query, occur_string in pairs(t) do
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86 local occur = BooleanClause.Occur.valueOf( occur_string.upper() )
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87 boolean_query.add( query, occur )
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88 end
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89 return boolean_query
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90 end
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91
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92 -- and list
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93 function queryTbl.all(t)
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94 local bt = {}
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95 for key, query in pairs(t) do
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96 if type(key)=="string" then
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97 query = queryTbl.term{[key]=query}
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98 end
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99 bt[query] = "MUST"
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100 end
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101 return queryTbl.boolean(bt)
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102 end
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104 -- or list
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105 function queryTbl.any(t)
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106 local bt = {}
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107 for key, query in pairs(t) do
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108 if type(key)=="string" then
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109 query = queryTbl.term{[key]=query}
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110 end
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111 bt[query] = "SHOULD"
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112 end
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113 return queryTbl.boolean(bt)
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114 end
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115
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116
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117 function queryTbl.sort(fields)
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118 #fields > 0 or error "list of sort fields expected"
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119 local a = {}
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120 for _, f in ipairs(fields) do
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121 f.field or error "missing sort field"
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122 f.type or error "missing sort type"
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123 local type = SortField.Type.valueOf( f.type.upper() )
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124 local reverse = f.reverse or false
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125 a[#a+1] = SortField.new(f.field,type,reverse)
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126 end
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127 return Sort.new(Table.unpack(a))
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128 end
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129
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130
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131 return index
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132 end
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133
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134 return M