Get next date in lucene index - search

Question

I am storing a listing of events in a lucene.net index, which has a start date field. I would like to add a button for the user to click to see the next event (based on the start date field) relative to the event they are viewing.
I'm currently using a ConstantScoreRangeQuery search to do a search of events between two dates, but not sure how I can get the next date in the index.

Answer 1

heres a simple way to do it using a TermEnum
RAMDirectory ramDir = new RAMDirectory();
IndexWriter iw = new IndexWriter(ramDir, new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_CURRENT));
Document d = new Document();
Field date = new Field("date", "", Field.Store.YES, Field.Index.ANALYZED);
d.Add(date);
DateTime first = DateTime.Now.Subtract(TimeSpan.FromDays(5));
DateTime second = DateTime.Now.Subtract(TimeSpan.FromDays(4));
DateTime third = DateTime.Now.Subtract(TimeSpan.FromDays(3));
DateTime fourth = DateTime.Now.Subtract(TimeSpan.FromDays(2));
DateTime fifth = DateTime.Now.Subtract(TimeSpan.FromDays(1));
date.SetValue(DateTools.DateToString(first, DateTools.Resolution.MINUTE));
iw.AddDocument(d);
date.SetValue(DateTools.DateToString(second, DateTools.Resolution.MINUTE));
iw.AddDocument(d);
date.SetValue(DateTools.DateToString(third, DateTools.Resolution.MINUTE));
iw.AddDocument(d);
date.SetValue(DateTools.DateToString(fourth, DateTools.Resolution.MINUTE));
iw.AddDocument(d);
date.SetValue(DateTools.DateToString(fifth, DateTools.Resolution.MINUTE));
iw.AddDocument(d);
iw.Commit();
IndexReader ir = iw.GetReader();
var termEnum = ir.Terms(new Term("date", DateTools.DateToString(second, DateTools.Resolution.MINUTE)));
if (termEnum.Next())
{
Console.WriteLine(DateTools.StringToDate(termEnum.Term().Text()));
Console.WriteLine(DateTools.StringToDate(termEnum.Term().Text()).Day == third.Day);
}
Console.Read();