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annotate roundup/backends/indexer_xapian.py @ 4775:d00a3ede67e4

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author Bernhard Reiter <bernhard@intevation.de>
date Thu, 28 Mar 2013 00:10:34 +0100
parents 6e3e4f24c753
children 3ff1a288fb9c
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1 ''' This implements the full-text indexer using the Xapian indexer.
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2 '''
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3 import re, os
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4
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5 import xapian
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6
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7 from roundup.backends.indexer_common import Indexer as IndexerBase
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8
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9 # TODO: we need to delete documents when a property is *reindexed*
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10
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11 class Indexer(IndexerBase):
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12 def __init__(self, db):
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13 IndexerBase.__init__(self, db)
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14 self.db_path = db.config.DATABASE
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15 self.reindex = 0
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16 self.transaction_active = False
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17
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18 def _get_database(self):
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19 index = os.path.join(self.db_path, 'text-index')
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20 return xapian.WritableDatabase(index, xapian.DB_CREATE_OR_OPEN)
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21
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22 def save_index(self):
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23 '''Save the changes to the index.'''
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24 if not self.transaction_active:
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25 return
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26 database = self._get_database()
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27 database.commit_transaction()
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28 self.transaction_active = False
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29
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30 def close(self):
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31 '''close the indexing database'''
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32 pass
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33
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34 def rollback(self):
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35 if not self.transaction_active:
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36 return
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37 database = self._get_database()
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38 database.cancel_transaction()
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39 self.transaction_active = False
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40
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41 def force_reindex(self):
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42 '''Force a reindexing of the database. This essentially
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43 empties the tables ids and index and sets a flag so
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44 that the databases are reindexed'''
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45 self.reindex = 1
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46
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47 def should_reindex(self):
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48 '''returns True if the indexes need to be rebuilt'''
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49 return self.reindex
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50
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51 def add_text(self, identifier, text, mime_type='text/plain'):
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52 ''' "identifier" is (classname, itemid, property) '''
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53 if mime_type != 'text/plain':
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54 return
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55 if not text: text = ''
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56
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57 # open the database and start a transaction if needed
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58 database = self._get_database()
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59
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60 # XXX: Xapian now supports transactions,
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61 # but there is a call to save_index() missing.
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62 #if not self.transaction_active:
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63 #database.begin_transaction()
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64 #self.transaction_active = True
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65
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66 # TODO: allow configuration of other languages
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67 stemmer = xapian.Stem("english")
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68
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69 # We use the identifier twice: once in the actual "text" being
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70 # indexed so we can search on it, and again as the "data" being
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71 # indexed so we know what we're matching when we get results
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72 identifier = '%s:%s:%s'%identifier
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73
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74 # create the new document
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75 doc = xapian.Document()
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76 doc.set_data(identifier)
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77 doc.add_term(identifier, 0)
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78
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79 for match in re.finditer(r'\b\w{%d,%d}\b'
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80 % (self.minlength, self.maxlength),
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81 text.upper()):
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82 word = match.group(0)
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83 if self.is_stopword(word):
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84 continue
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85 term = stemmer(word)
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86 doc.add_posting(term, match.start(0))
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87
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88 database.replace_document(identifier, doc)
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89
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90 def find(self, wordlist):
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91 '''look up all the words in the wordlist.
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92 If none are found return an empty dictionary
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93 * more rules here
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94 '''
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95 if not wordlist:
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96 return {}
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97
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98 database = self._get_database()
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99
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100 enquire = xapian.Enquire(database)
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101 stemmer = xapian.Stem("english")
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102 terms = []
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103 for term in [word.upper() for word in wordlist
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104 if self.minlength <= len(word) <= self.maxlength]:
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105 if not self.is_stopword(term):
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106 terms.append(stemmer(term))
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107 query = xapian.Query(xapian.Query.OP_AND, terms)
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108
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109 enquire.set_query(query)
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110 matches = enquire.get_mset(0, 10)
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111
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112 return [tuple(m.document.get_data().split(':'))
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113 for m in matches]
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114
Roundup Issue Tracker: http://roundup-tracker.org/