/// <summary> Constructs a filter for field <code>f</code> matching times
/// on or before <code>time</code>.
/// </summary>
public static DateFilter Before(System.String field, long time)
{
DateFilter result = new DateFilter(field);
result.end = DateField.TimeToString(time);
return(result);
}
/// <summary> Constructs a filter for field <code>f</code> matching times
/// between <code>from</code> and <code>to</code> inclusively.
/// </summary>
public DateFilter(System.String f, long from, long to)
{
InitBlock();
field = f;
start = DateField.TimeToString(from);
end = DateField.TimeToString(to);
}
/// <summary> Constructs a filter for field <code>f</code> matching
/// times on or after <code>time</code>.
/// </summary>
public static DateFilter After(System.String field, long time)
{
DateFilter result = new DateFilter(field);
result.start = DateField.TimeToString(time);
return(result);
}
public virtual void TestAfter()
{
// create an index
RAMDirectory indexStore = new RAMDirectory();
IndexWriter writer = new IndexWriter(indexStore, new SimpleAnalyzer(), true);
long now = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
Document doc = new Document();
// add time that is in the future
doc.Add(Field.Keyword("datefield", DateField.TimeToString(now + 888888)));
doc.Add(Field.Text("body", "Today is a very sunny day in New York City"));
writer.AddDocument(doc);
writer.Optimize();
writer.Close();
IndexSearcher searcher = new IndexSearcher(indexStore);
// filter that should preserve matches
DateFilter df1 = DateFilter.After("datefield", now);
// filter that should discard matches
DateFilter df2 = DateFilter.After("datefield", now + 999999);
// search something that doesn't exist with DateFilter
Query query1 = new TermQuery(new Term("body", "NoMatchForThis"));
// search for something that does exists
Query query2 = new TermQuery(new Term("body", "sunny"));
Hits result;
// ensure that queries return expected results without DateFilter first
result = searcher.Search(query1);
Assert.AreEqual(0, result.Length());
result = searcher.Search(query2);
Assert.AreEqual(1, result.Length());
// run queries with DateFilter
result = searcher.Search(query1, df1);
Assert.AreEqual(0, result.Length());
result = searcher.Search(query1, df2);
Assert.AreEqual(0, result.Length());
result = searcher.Search(query2, df1);
Assert.AreEqual(1, result.Length());
result = searcher.Search(query2, df2);
Assert.AreEqual(0, result.Length());
}
/// <summary>Makes a document for a File.
/// <p>
/// The document has three fields:
/// <ul>
/// <li><code>path</code>--containing the pathname of the file, as a stored,
/// tokenized Field;
/// <li><code>modified</code>--containing the last modified date of the file as
/// a keyword Field as encoded by <a
/// href="lucene.document.DateField.html">DateField</a>; and
/// <li><code>contents</code>--containing the full contents of the file, as a
/// Reader Field;
/// </summary>
public static Document Document(System.IO.FileInfo f)
{
// make a new, empty document
Document doc = new Document();
// Add the path of the file as a Field named "path". Use a Text Field, so
// that the index stores the path, and so that the path is searchable
doc.Add(Field.Text("path", f.FullName));
// Add the last modified date of the file a Field named "modified". Use a
// Keyword Field, so that it's searchable, but so that no attempt is made
// to tokenize the Field into words.
doc.Add(Field.Keyword("modified", DateField.TimeToString(((f.LastWriteTime.Ticks - 621355968000000000) / 10000))));
// Add the contents of the file a Field named "contents". Use a Text
// Field, specifying a Reader, so that the text of the file is tokenized.
// ?? why doesn't FileReader work here ??
System.IO.FileStream is_Renamed = new System.IO.FileStream(f.FullName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
System.IO.StreamReader reader = new System.IO.StreamReader(new System.IO.StreamReader(is_Renamed, System.Text.Encoding.Default).BaseStream, new System.IO.StreamReader(is_Renamed, System.Text.Encoding.Default).CurrentEncoding);
doc.Add(Field.Text("contents", reader));
// return the document
return(doc);
}