| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| using System; |
| using Lucene.Net.Documents; |
| using Lucene.Net.Index; |
| using Lucene.Net.Index.Extensions; |
| using Lucene.Net.Queries.Function.ValueSources; |
| using Lucene.Net.Search; |
| using Lucene.Net.Store; |
| using Lucene.Net.Util; |
| using NUnit.Framework; |
| |
| namespace Lucene.Net.Tests.Queries.Function |
| { |
| /// <summary> |
| /// Test that functionquery's getSortField() actually works. |
| /// </summary> |
| public class TestFunctionQuerySort : LuceneTestCase |
| { |
| [Test] |
| public void TestSearchAfterWhenSortingByFunctionValues() |
| { |
| Directory dir = NewDirectory(); |
| IndexWriterConfig iwc = NewIndexWriterConfig(TEST_VERSION_CURRENT, null); |
| iwc.SetMergePolicy(NewLogMergePolicy()); // depends on docid order |
| RandomIndexWriter writer = new RandomIndexWriter(Random, dir, iwc); |
| |
| Document doc = new Document(); |
| Field field = new StringField("value", "", Field.Store.YES); |
| doc.Add(field); |
| |
| // Save docs unsorted (decreasing value n, n-1, ...) |
| const int NUM_VALS = 5; |
| for (int val = NUM_VALS; val > 0; val--) |
| { |
| field.SetStringValue(Convert.ToString(val)); |
| writer.AddDocument(doc); |
| } |
| |
| // Open index |
| IndexReader reader = writer.GetReader(); |
| writer.Dispose(); |
| IndexSearcher searcher = NewSearcher(reader); |
| |
| // Get ValueSource from FieldCache |
| Int32FieldSource src = new Int32FieldSource("value"); |
| // ...and make it a sort criterion |
| SortField sf = src.GetSortField(false).Rewrite(searcher); |
| Sort orderBy = new Sort(sf); |
| |
| // Get hits sorted by our FunctionValues (ascending values) |
| Query q = new MatchAllDocsQuery(); |
| TopDocs hits = searcher.Search(q, reader.MaxDoc, orderBy); |
| assertEquals(NUM_VALS, hits.ScoreDocs.Length); |
| // Verify that sorting works in general |
| int i = 0; |
| foreach (ScoreDoc hit in hits.ScoreDocs) |
| { |
| int valueFromDoc = Convert.ToInt32(reader.Document(hit.Doc).Get("value")); |
| assertEquals(++i, valueFromDoc); |
| } |
| |
| // Now get hits after hit #2 using IS.searchAfter() |
| int afterIdx = 1; |
| FieldDoc afterHit = (FieldDoc)hits.ScoreDocs[afterIdx]; |
| hits = searcher.SearchAfter(afterHit, q, reader.MaxDoc, orderBy); |
| |
| // Expected # of hits: NUM_VALS - 2 |
| assertEquals(NUM_VALS - (afterIdx + 1), hits.ScoreDocs.Length); |
| |
| // Verify that hits are actually "after" |
| int afterValue = (int)((double?)afterHit.Fields[0]); |
| foreach (ScoreDoc hit in hits.ScoreDocs) |
| { |
| int val = Convert.ToInt32(reader.Document(hit.Doc).Get("value")); |
| assertTrue(afterValue <= val); |
| assertFalse(hit.Doc == afterHit.Doc); |
| } |
| reader.Dispose(); |
| dir.Dispose(); |
| } |
| } |
| } |