public static void Main(System.String[] args)
{
try
{
Directory directory = FSDirectory.GetDirectory("demo index", false);
IndexReader reader = IndexReader.Open(directory);
// Term term = new Term("path", "pizza");
// int deleted = reader.delete(term);
// System.out.println("deleted " + deleted +
// " documents containing " + term);
for (int i = 0; i < reader.MaxDoc(); i++)
{
reader.Delete(i);
}
reader.Close();
directory.Close();
}
catch (System.Exception e)
{
System.Console.Out.WriteLine(" caught a " + e.GetType() + "\n with message: " + e.Message);
}
}
/* Walk directory hierarchy in uid order, while keeping uid iterator from
* /* existing index in sync. Mismatches indicate one of: (a) old documents to
* /* be deleted; (b) unchanged documents, to be left alone; or (c) new
* /* documents, to be indexed.
*/
private static void IndexDocs(System.IO.FileInfo file, System.String index, bool create)
{
if (!create)
{
// incrementally update
reader = IndexReader.Open(index); // open existing index
uidIter = reader.Terms(new Term("uid", "")); // init uid iterator
IndexDocs(file);
if (deleting)
{
// delete rest of stale docs
while (uidIter.Term() != null && (System.Object)uidIter.Term().Field() == (System.Object) "uid")
{
System.Console.Out.WriteLine("deleting " + HTMLDocument.UID2URL(uidIter.Term().Text()));
reader.Delete(uidIter.Term());
uidIter.Next();
}
deleting = false;
}
uidIter.Close(); // close uid iterator
reader.Close(); // close existing index
}
// don't have exisiting
else
{
IndexDocs(file);
}
}
private static void IndexDocs(System.IO.FileInfo file)
{
if (System.IO.Directory.Exists(file.FullName))
{
// if a directory
System.String[] files = System.IO.Directory.GetFileSystemEntries(file.FullName); // list its files
System.Array.Sort(files); // sort the files
for (int i = 0; i < files.Length; i++)
{
// recursively index them
IndexDocs(new System.IO.FileInfo(files[i]));
}
}
else if (file.FullName.EndsWith(".html") || file.FullName.EndsWith(".htm") || file.FullName.EndsWith(".txt"))
{
// index .txt files
if (uidIter != null)
{
System.String uid = HTMLDocument.UID(file); // construct uid for doc
while (uidIter.Term() != null && (System.Object)uidIter.Term().Field() == (System.Object) "uid" && String.CompareOrdinal(uidIter.Term().Text(), uid) < 0)
{
if (deleting)
{
// delete stale docs
System.Console.Out.WriteLine("deleting " + HTMLDocument.UID2URL(uidIter.Term().Text()));
reader.Delete(uidIter.Term());
}
uidIter.Next();
}
if (uidIter.Term() != null && (System.Object)uidIter.Term().Field() == (System.Object) "uid" && String.CompareOrdinal(uidIter.Term().Text(), uid) == 0)
{
uidIter.Next(); // keep matching docs
}
else if (!deleting)
{
// add new docs
Document doc = HTMLDocument.Document(file);
System.Console.Out.WriteLine("adding " + doc.Get("url"));
writer.AddDocument(doc);
}
}
else
{
// creating a new index
Document doc = HTMLDocument.Document(file);
System.Console.Out.WriteLine("adding " + doc.Get("url"));
writer.AddDocument(doc); // add docs unconditionally
}
}
}
/* Walk directory hierarchy in uid order, while keeping uid iterator from
/* existing index in sync. Mismatches indicate one of: (a) old documents to
/* be deleted; (b) unchanged documents, to be left alone; or (c) new
/* documents, to be indexed.
*/
private static void IndexDocs(System.IO.FileInfo file, System.String index, bool create)
{
if (!create)
{
// incrementally update
reader = IndexReader.Open(index); // open existing index
uidIter = reader.Terms(new Term("uid", "")); // init uid iterator
IndexDocs(file);
if (deleting)
{
// delete rest of stale docs
while (uidIter.Term() != null && (System.Object) uidIter.Term().Field() == (System.Object) "uid")
{
System.Console.Out.WriteLine("deleting " + HTMLDocument.UID2URL(uidIter.Term().Text()));
reader.Delete(uidIter.Term());
uidIter.Next();
}
deleting = false;
}
uidIter.Close(); // close uid iterator
reader.Close(); // close existing index
}
// don't have exisiting
else
IndexDocs(file);
}
public virtual void TestEmptyIndex()
{
// creating two directories for indices
Directory indexStoreA = new RAMDirectory();
Directory indexStoreB = new RAMDirectory();
// creating a document to store
Document lDoc = new Document();
lDoc.Add(Field.Text("fulltext", "Once upon a time....."));
lDoc.Add(Field.Keyword("id", "doc1"));
lDoc.Add(Field.Keyword("handle", "1"));
// creating a document to store
Document lDoc2 = new Document();
lDoc2.Add(Field.Text("fulltext", "in a galaxy far far away....."));
lDoc2.Add(Field.Keyword("id", "doc2"));
lDoc2.Add(Field.Keyword("handle", "1"));
// creating a document to store
Document lDoc3 = new Document();
lDoc3.Add(Field.Text("fulltext", "a bizarre bug manifested itself...."));
lDoc3.Add(Field.Keyword("id", "doc3"));
lDoc3.Add(Field.Keyword("handle", "1"));
// creating an index writer for the first index
IndexWriter writerA = new IndexWriter(indexStoreA, new StandardAnalyzer(), true);
// creating an index writer for the second index, but writing nothing
IndexWriter writerB = new IndexWriter(indexStoreB, new StandardAnalyzer(), true);
//--------------------------------------------------------------------
// scenario 1
//--------------------------------------------------------------------
// writing the documents to the first index
writerA.AddDocument(lDoc);
writerA.AddDocument(lDoc2);
writerA.AddDocument(lDoc3);
writerA.Optimize();
writerA.Close();
// closing the second index
writerB.Close();
// creating the query
Query query = Lucene.Net.QueryParsers.QueryParser.Parse("handle:1", "fulltext", new StandardAnalyzer());
// building the searchables
Searcher[] searchers = new Searcher[2];
// VITAL STEP:adding the searcher for the empty index first, before the searcher for the populated index
searchers[0] = new IndexSearcher(indexStoreB);
searchers[1] = new IndexSearcher(indexStoreA);
// creating the multiSearcher
Searcher mSearcher = GetMultiSearcherInstance(searchers);
// performing the search
Hits hits = mSearcher.Search(query);
Assert.AreEqual(3, hits.Length());
try
{
// iterating over the hit documents
for (int i = 0; i < hits.Length(); i++)
{
Document d = hits.Doc(i);
}
}
catch (System.IndexOutOfRangeException e)
{
Assert.Fail("ArrayIndexOutOfBoundsException thrown: " + e.Message);
System.Console.Error.WriteLine(e.Source);
}
finally
{
mSearcher.Close();
}
//--------------------------------------------------------------------
// scenario 2
//--------------------------------------------------------------------
// adding one document to the empty index
writerB = new IndexWriter(indexStoreB, new StandardAnalyzer(), false);
writerB.AddDocument(lDoc);
writerB.Optimize();
writerB.Close();
// building the searchables
Searcher[] searchers2 = new Searcher[2];
// VITAL STEP:adding the searcher for the empty index first, before the searcher for the populated index
searchers2[0] = new IndexSearcher(indexStoreB);
searchers2[1] = new IndexSearcher(indexStoreA);
// creating the mulitSearcher
Searcher mSearcher2 = GetMultiSearcherInstance(searchers2);
// performing the same search
Hits hits2 = mSearcher2.Search(query);
Assert.AreEqual(4, hits2.Length());
try
{
// iterating over the hit documents
for (int i = 0; i < hits2.Length(); i++)
{
// no exception should happen at this point
Document d = hits2.Doc(i);
}
}
catch (System.Exception e)
{
Assert.Fail("Exception thrown: " + e.Message);
System.Console.Error.WriteLine(e.Source);
}
finally
{
mSearcher2.Close();
}
//--------------------------------------------------------------------
// scenario 3
//--------------------------------------------------------------------
// deleting the document just added, this will cause a different exception to take place
Term term = new Term("id", "doc1");
IndexReader readerB = IndexReader.Open(indexStoreB);
readerB.Delete(term);
readerB.Close();
// optimizing the index with the writer
writerB = new IndexWriter(indexStoreB, new StandardAnalyzer(), false);
writerB.Optimize();
writerB.Close();
// building the searchables
Searcher[] searchers3 = new Searcher[2];
searchers3[0] = new IndexSearcher(indexStoreB);
searchers3[1] = new IndexSearcher(indexStoreA);
// creating the mulitSearcher
Searcher mSearcher3 = GetMultiSearcherInstance(searchers3);
// performing the same search
Hits hits3 = mSearcher3.Search(query);
Assert.AreEqual(3, hits3.Length());
try
{
// iterating over the hit documents
for (int i = 0; i < hits3.Length(); i++)
{
Document d = hits3.Doc(i);
}
}
catch (System.IO.IOException e)
{
Assert.Fail("IOException thrown: " + e.Message);
System.Console.Error.WriteLine(e.Source);
}
finally
{
mSearcher3.Close();
}
}
