public virtual void TestPrefixFilter_Mem()
{
Directory directory = NewDirectory();
string[] categories = new string[] { "/Computers/Linux", "/Computers/Mac/One", "/Computers/Mac/Two", "/Computers/Windows" };
RandomIndexWriter writer = new RandomIndexWriter(Random(), directory, Similarity, TimeZone);
for (int i = 0; i < categories.Length; i++)
{
Document doc = new Document();
doc.Add(NewStringField("category", categories[i], Field.Store.YES));
writer.AddDocument(doc);
}
IndexReader reader = writer.Reader;
// PrefixFilter combined with ConstantScoreQuery
PrefixFilter filter = new PrefixFilter(new Term("category", "/Computers"));
Query query = new ConstantScoreQuery(filter);
IndexSearcher searcher = NewSearcher(reader);
ScoreDoc[] hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(4, hits.Length);
// test middle of values
filter = new PrefixFilter(new Term("category", "/Computers/Mac"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(2, hits.Length);
// test start of values
filter = new PrefixFilter(new Term("category", "/Computers/Linux"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(1, hits.Length);
// test end of values
filter = new PrefixFilter(new Term("category", "/Computers/Windows"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(1, hits.Length);
// test non-existant
filter = new PrefixFilter(new Term("category", "/Computers/ObsoleteOS"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(0, hits.Length);
// test non-existant, before values
filter = new PrefixFilter(new Term("category", "/Computers/AAA"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(0, hits.Length);
// test non-existant, after values
filter = new PrefixFilter(new Term("category", "/Computers/ZZZ"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(0, hits.Length);
// test zero length prefix
filter = new PrefixFilter(new Term("category", ""));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(4, hits.Length);
// test non existent field
filter = new PrefixFilter(new Term("nonexistantfield", "/Computers"));
query = new ConstantScoreQuery(filter);
hits = searcher.Search(query, null, 1000).ScoreDocs;
Assert.AreEqual(0, hits.Length);
writer.Dispose();
reader.Dispose();
directory.Dispose();
}
}