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annotate lucene/src/luan/modules/lucene/Lucene.luan @ 297:899253043270

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remove PackageLuan.load_lib() git-svn-id: https://luan-java.googlecode.com/svn/trunk@298 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 16 Dec 2014 03:26:43 +0000
parents 4d53e9fc1bd9
children 9fb523472035
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1 import "luan:Table"
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2 import "java:luan.modules.lucene.LuceneIndex"
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3 import "java:org.apache.lucene.index.Term"
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4 import "java:org.apache.lucene.search.TermQuery"
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5 import "java:org.apache.lucene.search.MatchAllDocsQuery"
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6 import "java:org.apache.lucene.search.BooleanQuery"
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7 import "java:org.apache.lucene.search.BooleanClause"
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8 import "java:org.apache.lucene.search.Sort"
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9 import "java:org.apache.lucene.search.SortField"
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11
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12 function Index(indexDir)
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13 local index = LuceneIndex.new(indexDir).table()
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14
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15 function index.save_document(doc)
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16 index.Writer( function(writer)
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17 writer.save_document(doc)
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18 end )
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19 end
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21 function index.delete_documents(terms)
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22 index.Writer( function(writer)
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23 writer.delete_documents(terms)
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24 end )
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25 end
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26
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27 function index.get_first(query, sort)
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28 return index.Searcher( function(searcher)
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29 local results, _, total_hits = searcher.search(query,1,sort)
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30 return results(), total_hits
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31 end )
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32 end
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33
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34 function index.get_document(query)
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35 local doc, total_hits = index.get_first(query);
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36 if total_hits > 1 then
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37 error( "found " .. total_hits .. " documents" )
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38 end
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39 return doc
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40 end
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41
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42 function index.count(query)
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43 return index.Searcher( function(searcher)
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44 local _, _, total_hits = searcher.search(query,0)
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45 return total_hits
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46 end )
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47 end
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48
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49
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50
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51 local Query = {}
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52 index.Query = Query
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53
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54 Query.all_docs = MatchAllDocsQuery.new()
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55
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56 function Query.term(t)
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57 local iter = pairs(t)
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58 local field, value = iter()
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59 field and value or error "missing term"
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60 iter()==nil or error "only one term allowed"
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61 field = index.map_field_name(field)
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62 return TermQuery.new(Term.new(field,value))
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63 end
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64
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65 function Query.boolean(t)
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66 local boolean_query = BooleanQuery.new()
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67 for query, occur_string in pairs(t) do
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68 local occur = BooleanClause.Occur.valueOf( occur_string.upper() )
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69 boolean_query.add( query, occur )
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70 end
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71 return boolean_query
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72 end
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73
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74 -- and list
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75 function Query.all(t)
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76 local bt = {}
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77 for key, query in pairs(t) do
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78 if type(key)=="string" then
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79 query = Query.term{[key]=query}
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80 end
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81 bt[query] = "MUST"
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82 end
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83 return Query.boolean(bt)
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84 end
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85
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86 -- or list
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87 function Query.any(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] = "SHOULD"
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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
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99 function Query.sort(fields)
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100 #fields > 0 or error "list of sort fields expected"
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101 local a = {}
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102 for _, f in ipairs(fields) do
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103 f.field or error "missing sort field"
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104 f.type or error "missing sort type"
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105 local type = SortField.Type.valueOf( f.type.upper() )
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106 local reverse = f.reverse or false
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107 a[#a+1] = SortField.new(f.field,type,reverse)
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108 end
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109 return Sort.new(Table.unpack(a))
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110 end
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111
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112
230
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113 return index
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114 end