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annotate roundup/backends/indexer_common.py @ 3092:a8c2371f45b6

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Some cleanup: * indexer_rdbms.Indexer now subclasses from indexer_common.Indexer instead of indexer_dbm.Indexer * rdbms_common doesn't call save_index anymore * so we can remove save_index from indexer_rdbms and back_tsearch2 * indexer_rdbms.Indexer.rollback() wasn't used at all, so remove it * move is_stopword code to indexer_common
author Johannes Gijsbers <jlgijsbers@users.sourceforge.net>
date Sat, 08 Jan 2005 16:16:59 +0000
parents 6da931530497
children 5cd1c83dea50
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1 #$Id: indexer_common.py,v 1.4 2005-01-08 16:16:59 jlgijsbers Exp $
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2 import re
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3
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4 from roundup import hyperdb
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5
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6 stopwords = [
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7 "A", "AND", "ARE", "AS", "AT", "BE", "BUT", "BY",
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8 "FOR", "IF", "IN", "INTO", "IS", "IT",
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9 "NO", "NOT", "OF", "ON", "OR", "SUCH",
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10 "THAT", "THE", "THEIR", "THEN", "THERE", "THESE",
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11 "THEY", "THIS", "TO", "WAS", "WILL", "WITH"
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12 ]
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13
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14 is_stopword = {}
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15 for word in stopwords:
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16 is_stopword[word] = None
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17 is_stopword = is_stopword.has_key
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18
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19 def _isLink(propclass):
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20 return (isinstance(propclass, hyperdb.Link) or
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21 isinstance(propclass, hyperdb.Multilink))
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22
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23 class Indexer:
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24 def getHits(self, search_terms, klass):
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25 return self.find(search_terms)
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26
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27 def search(self, search_terms, klass, ignore={}):
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28 '''Display search results looking for [search, terms] associated
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29 with the hyperdb Class "klass". Ignore hits on {class: property}.
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30
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31 "dre" is a helper, not an argument.
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32 '''
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33 # do the index lookup
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34 hits = self.getHits(search_terms, klass)
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35 if not hits:
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36 return {}
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37
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38 designator_propname = {}
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39 for nm, propclass in klass.getprops().items():
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40 if _isLink(propclass):
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41 designator_propname[propclass.classname] = nm
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42
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43 # build a dictionary of nodes and their associated messages
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44 # and files
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45 nodeids = {} # this is the answer
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46 propspec = {} # used to do the klass.find
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47 for propname in designator_propname.values():
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48 propspec[propname] = {} # used as a set (value doesn't matter)
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49 for classname, nodeid, property in hits:
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50 # skip this result if we don't care about this class/property
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51 if ignore.has_key((classname, property)):
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52 continue
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53
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54 # if it's a property on klass, it's easy
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55 if classname == klass.classname:
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56 if not nodeids.has_key(nodeid):
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57 nodeids[nodeid] = {}
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58 continue
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59
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60 # make sure the class is a linked one, otherwise ignore
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61 if not designator_propname.has_key(classname):
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62 continue
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63
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64 # it's a linked class - set up to do the klass.find
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65 linkprop = designator_propname[classname] # eg, msg -> messages
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66 propspec[linkprop][nodeid] = 1
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67
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68 # retain only the meaningful entries
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69 for propname, idset in propspec.items():
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70 if not idset:
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71 del propspec[propname]
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72
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73 # klass.find tells me the klass nodeids the linked nodes relate to
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74 for resid in klass.find(**propspec):
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75 resid = str(resid)
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76 if not nodeids.has_key(id):
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77 nodeids[resid] = {}
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78 node_dict = nodeids[resid]
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79 # now figure out where it came from
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80 for linkprop in propspec.keys():
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81 for nodeid in klass.get(resid, linkprop):
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82 if propspec[linkprop].has_key(nodeid):
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83 # OK, this node[propname] has a winner
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84 if not node_dict.has_key(linkprop):
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85 node_dict[linkprop] = [nodeid]
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86 else:
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87 node_dict[linkprop].append(nodeid)
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88 return nodeids
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