public virtual void TestPhrasePrefix()
{
RAMDirectory indexStore = new RAMDirectory();
IndexWriter writer = new IndexWriter(indexStore, new SimpleAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
Document doc1 = new Document();
Document doc2 = new Document();
Document doc3 = new Document();
Document doc4 = new Document();
Document doc5 = new Document();
doc1.Add(new Field("body", "blueberry pie", Field.Store.YES, Field.Index.ANALYZED));
doc2.Add(new Field("body", "blueberry strudel", Field.Store.YES, Field.Index.ANALYZED));
doc3.Add(new Field("body", "blueberry pizza", Field.Store.YES, Field.Index.ANALYZED));
doc4.Add(new Field("body", "blueberry chewing gum", Field.Store.YES, Field.Index.ANALYZED));
doc5.Add(new Field("body", "piccadilly circus", Field.Store.YES, Field.Index.ANALYZED));
writer.AddDocument(doc1);
writer.AddDocument(doc2);
writer.AddDocument(doc3);
writer.AddDocument(doc4);
writer.AddDocument(doc5);
writer.Optimize();
writer.Close();
IndexSearcher searcher = new IndexSearcher(indexStore, true);
//PhrasePrefixQuery query1 = new PhrasePrefixQuery();
MultiPhraseQuery query1 = new MultiPhraseQuery();
//PhrasePrefixQuery query2 = new PhrasePrefixQuery();
MultiPhraseQuery query2 = new MultiPhraseQuery();
query1.Add(new Term("body", "blueberry"));
query2.Add(new Term("body", "strawberry"));
System.Collections.ArrayList termsWithPrefix = new System.Collections.ArrayList();
IndexReader ir = IndexReader.Open(indexStore, true);
// this TermEnum gives "piccadilly", "pie" and "pizza".
System.String prefix = "pi";
TermEnum te = ir.Terms(new Term("body", prefix + "*"));
do
{
if (te.Term.Text.StartsWith(prefix))
{
termsWithPrefix.Add(te.Term);
}
}
while (te.Next());
query1.Add((Term[]) termsWithPrefix.ToArray(typeof(Term)));
query2.Add((Term[]) termsWithPrefix.ToArray(typeof(Term)));
ScoreDoc[] result;
result = searcher.Search(query1, null, 1000).ScoreDocs;
Assert.AreEqual(2, result.Length);
result = searcher.Search(query2, null, 1000).ScoreDocs;
Assert.AreEqual(0, result.Length);
}
}