Mercurial Hosting > luan
annotate lucene/src/luan/modules/lucene/Lucene.luan @ 521:8a217fe5b4f3
cleaner LuanState.onClose()
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 27 May 2015 03:12:28 -0600 |
parents | 8dcf9e12446b |
children | 3058870cbe83 |
rev | line source |
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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 |
503 | 4 local ipairs = Luan.ipairs |
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5 local type = Luan.type |
503 | 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 |
503 | 17 local M = {} |
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18 |
503 | 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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30 |
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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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36 |
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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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65 |
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66 |
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67 local queryTbl = {} |
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68 index.query = queryTbl |
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69 |
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70 queryTbl.parse = java_index.parse |
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71 |
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72 queryTbl.all_docs = MatchAllDocsQuery.new() |
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73 |
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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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103 |
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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 field = index.map_field_name(f.field) |
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124 local type = SortField.Type.valueOf( f.type.upper() ) |
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125 local reverse = f.reverse or false |
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126 a[#a+1] = SortField.new(field,type,reverse) |
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127 end |
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128 return Sort.new(Table.unpack(a)) |
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129 end |
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130 |
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131 |
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132 return index |
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133 end |
503 | 134 |
135 return M |