samples/LuceneInAction/lia/extsearch/sorting/DistanceSortingTest.py

   1 # ====================================================================
   2 #   Licensed under the Apache License, Version 2.0 (the "License");
   3 #   you may not use this file except in compliance with the License.
   4 #   You may obtain a copy of the License at
   5 #
   6 #       http://www.apache.org/licenses/LICENSE-2.0
   7 #
   8 #   Unless required by applicable law or agreed to in writing, software
   9 #   distributed under the License is distributed on an "AS IS" BASIS,
  10 #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  11 #   See the License for the specific language governing permissions and
  12 #   limitations under the License.
  13 # ====================================================================
  14
  15 from math import sqrt
  16 from unittest import TestCase
  17
  18 from lucene import \
  19      WhitespaceAnalyzer, IndexSearcher, Term, TermQuery, RAMDirectory, \
  20      Document, Field, IndexWriter, Sort, SortField, FieldDoc, Double
  21
  22 from lia.extsearch.sorting.DistanceComparatorSource import \
  23      DistanceComparatorSource
  24
  25
  26 class DistanceSortingTest(TestCase):
  27
  28     def setUp(self):
  29
  30         self.directory = RAMDirectory()
  31         writer = IndexWriter(self.directory, WhitespaceAnalyzer(), True,
  32                              IndexWriter.MaxFieldLength.UNLIMITED)
  33
  34         self.addPoint(writer, "El Charro", "restaurant", 1, 2)
  35         self.addPoint(writer, "Cafe Poca Cosa", "restaurant", 5, 9)
  36         self.addPoint(writer, "Los Betos", "restaurant", 9, 6)
  37         self.addPoint(writer, "Nico's Taco Shop", "restaurant", 3, 8)
  38
  39         writer.close()
  40
  41         self.searcher = IndexSearcher(self.directory, True)
  42         self.query = TermQuery(Term("type", "restaurant"))
  43
  44     def addPoint(self, writer, name, type, x, y):
  45
  46         doc = Document()
  47         doc.add(Field("name", name, Field.Store.YES, Field.Index.NOT_ANALYZED))
  48         doc.add(Field("type", type, Field.Store.YES, Field.Index.NOT_ANALYZED))
  49         doc.add(Field("x", str(x), Field.Store.YES,
  50                       Field.Index.NOT_ANALYZED_NO_NORMS))
  51         doc.add(Field("y", str(y), Field.Store.YES,
  52                       Field.Index.NOT_ANALYZED_NO_NORMS));
  53
  54         writer.addDocument(doc)
  55
  56     def testNearestRestaurantToHome(self):
  57
  58         sort = Sort(SortField("location", DistanceComparatorSource(0, 0)))
  59
  60         scoreDocs = self.searcher.search(self.query, None, 50, sort).scoreDocs
  61         self.assertEqual("El Charro", self.searcher.doc(scoreDocs[0].doc).get("name"), "closest")
  62         self.assertEqual("Los Betos", self.searcher.doc(scoreDocs[3].doc).get("name"), "furthest")
  63
  64     def testNeareastRestaurantToWork(self):
  65
  66         sort = Sort(SortField("location", DistanceComparatorSource(10, 10)))
  67
  68         docs = self.searcher.search(self.query, None, 3, sort)
  69         self.assertEqual(4, docs.totalHits)
  70         self.assertEqual(3, len(docs.scoreDocs))
  71
  72         fieldDoc = FieldDoc.cast_(docs.scoreDocs[0])
  73         distance = Double.cast_(fieldDoc.fields[0]).doubleValue()
  74
  75         self.assertEqual(sqrt(17), distance,
  76                          "(10,10) -> (9,6) = sqrt(17)")
  77
  78         document = self.searcher.doc(fieldDoc.doc)
  79         self.assertEqual("Los Betos", document["name"])
  80
  81         self.dumpDocs(sort, docs)
  82
  83     def dumpDocs(self, sort, docs):
  84
  85         print "Sorted by:", sort
  86
  87         for scoreDoc in docs.scoreDocs:
  88             fieldDoc = FieldDoc.cast_(scoreDoc)
  89             distance = Double.cast_(fieldDoc.fields[0]).doubleValue()
  90             doc = self.searcher.doc(fieldDoc.doc)
  91             print "  %(name)s @ (%(location)s) ->" %doc, distance