public override Token Next()
{
if (inPhrase)
{
inPhrase = false;
return(new Token("phrase2", savedStart, savedEnd));
}
else
{
for (Token token = input.Next(); token != null; token = input.Next())
{
if (token.TermText().Equals("phrase"))
{
inPhrase = true;
savedStart = token.StartOffset();
savedEnd = token.EndOffset();
return(new Token("phrase1", savedStart, savedEnd));
}
else if (!token.TermText().Equals("stop"))
{
return(token);
}
}
}
return(null);
}
internal static void Test(System.IO.TextReader reader, bool verbose, long bytes)
{
Analyzer analyzer = new SimpleAnalyzer();
TokenStream stream = analyzer.TokenStream(null, reader);
System.DateTime start = System.DateTime.Now;
int count = 0;
for (Token t = stream.Next(); t != null; t = stream.Next())
{
if (verbose)
{
System.Console.Out.WriteLine("Text=" + t.TermText() + " start=" + t.StartOffset() + " end=" + t.EndOffset());
}
count++;
}
System.DateTime end = System.DateTime.Now;
long time = end.Ticks - start.Ticks;
System.Console.Out.WriteLine(time + " milliseconds to extract " + count + " tokens");
System.Console.Out.WriteLine((time * 1000.0) / count + " microseconds/token");
System.Console.Out.WriteLine((bytes * 1000.0 * 60.0 * 60.0) / (time * 1000000.0) + " megabytes/hour");
}
/// <summary>
/// Returns the next, stemmed, input Token.
/// </summary>
/// <returns>
/// The stemed form of a token.
/// </returns>
/// <throws>IOException</throws>
public override Token Next()
{
Token token = input.Next();
if (token == null)
{
return(null);
}
else
{
string str = stemmer.stem(token.TermText());
//if ((System.Object) str != token.TermText())
if (!str.Equals(token.TermText()))
{
// Yes, I mean object reference comparison here
//token.TermText() = str;
return(new Token(str, token.StartOffset(), token.EndOffset(), token.Type()));
}
return(token);
}
}
public virtual void TestIncrementingPositions()
{
Analyzer analyzer = new WhitespaceAnalyzer();
TokenStream ts = analyzer.TokenStream("Field", new System.IO.StringReader("one two three four five"));
while (true)
{
Token token = ts.Next();
if (token == null)
{
break;
}
Assert.AreEqual(1, token.GetPositionIncrement(), token.TermText());
}
}
/* (non-Javadoc)
* @see Lucene.Net.Highlight.FragmentScorer#scoreToken(org.apache.lucene.analysis.Token)
*/
public virtual float GetTokenScore(Token token)
{
System.String termText = token.TermText();
WeightedTerm queryTerm = (WeightedTerm)termsToFind[termText];
if (queryTerm == null)
{
//not a query term - return
return(0);
}
//found a query term - is it unique in this doc?
if (!uniqueTermsInFragment.Contains(termText))
{
totalScore += queryTerm.GetWeight();
uniqueTermsInFragment.Add(termText, termText);
}
return(queryTerm.GetWeight());
}
public virtual void TestKOI8()
{
//System.out.println(new java.util.Date());
RussianAnalyzer ra = new RussianAnalyzer(RussianCharsets.KOI8);
// KOI8
inWordsKOI8 = new System.IO.StreamReader(
new System.IO.FileStream(
new System.IO.FileInfo(
dataDir.FullName + @"Analysis\RU\testKOI8.txt").FullName,
System.IO.FileMode.Open,
System.IO.FileAccess.Read),
System.Text.Encoding.GetEncoding("iso-8859-1"));
sampleKOI8 = new System.IO.StreamReader(
new System.IO.FileStream(
new System.IO.FileInfo(dataDir.FullName + @"Analysis\RU\resKOI8.htm").FullName,
System.IO.FileMode.Open,
System.IO.FileAccess.Read),
System.Text.Encoding.GetEncoding("iso-8859-1"));
TokenStream in_Renamed = ra.TokenStream("all", inWordsKOI8);
RussianLetterTokenizer sample = new RussianLetterTokenizer(sampleKOI8, RussianCharsets.KOI8);
for (; ;)
{
Token token = in_Renamed.Next();
if (token == null)
{
break;
}
Token sampleToken = sample.Next();
Assert.AreEqual(token.TermText(), sampleToken == null ? null : sampleToken.TermText(), "KOI8");
}
inWordsKOI8.Close();
sampleKOI8.Close();
}
public virtual void TestUnicode()
{
RussianAnalyzer ra = new RussianAnalyzer(RussianCharsets.UnicodeRussian);
inWords = new System.IO.StreamReader(
new System.IO.FileStream(
new System.IO.FileInfo(
dataDir.FullName + @"Analysis\RU\testUnicode.txt").FullName,
System.IO.FileMode.Open,
System.IO.FileAccess.Read),
System.Text.Encoding.GetEncoding("Unicode"));
sampleUnicode = new System.IO.StreamReader(
new System.IO.FileStream(
new System.IO.FileInfo(
dataDir.FullName + @"Analysis\RU\resUnicode.htm").FullName,
System.IO.FileMode.Open,
System.IO.FileAccess.Read),
System.Text.Encoding.GetEncoding("Unicode"));
TokenStream in_Renamed = ra.TokenStream("all", inWords);
RussianLetterTokenizer sample = new RussianLetterTokenizer(sampleUnicode, RussianCharsets.UnicodeRussian);
for (; ;)
{
Token token = in_Renamed.Next();
if (token == null)
{
break;
}
Token sampleToken = sample.Next();
Assert.AreEqual(token.TermText(), sampleToken == null ? null : sampleToken.TermText(), "Unicode");
}
inWords.Close();
sampleUnicode.Close();
}
public virtual void Test1251()
{
// 1251
inWords1251 = new System.IO.StreamReader(
new System.IO.FileStream(
new System.IO.FileInfo(
dataDir.FullName + @"Analysis\RU\test1251.txt").FullName,
System.IO.FileMode.Open,
System.IO.FileAccess.Read),
System.Text.Encoding.GetEncoding("iso-8859-1"));
sample1251 = new System.IO.StreamReader(
new System.IO.FileStream(
new System.IO.FileInfo(
dataDir.FullName + @"Analysis\RU\res1251.htm").FullName,
System.IO.FileMode.Open,
System.IO.FileAccess.Read),
System.Text.Encoding.GetEncoding("iso-8859-1"));
RussianAnalyzer ra = new RussianAnalyzer(RussianCharsets.CP1251);
TokenStream in_Renamed = ra.TokenStream("", inWords1251);
RussianLetterTokenizer sample = new RussianLetterTokenizer(sample1251, RussianCharsets.CP1251);
for (; ;)
{
Token token = in_Renamed.Next();
if (token == null)
{
break;
}
Token sampleToken = sample.Next();
Assert.AreEqual(token.TermText(), sampleToken == null ? null : sampleToken.TermText(), "1251");
}
inWords1251.Close();
sample1251.Close();
}
/// <summary>Returns the next input Token, after being stemmed </summary>
public override Token Next()
{
Token token = input.Next();
if (token == null)
{
return(null);
}
stemmer.SetCurrent(token.TermText());
try
{
stemMethod.Invoke(stemmer, (System.Object[])EMPTY_ARGS);
}
catch (System.Exception e)
{
throw new System.SystemException(e.ToString());
}
Token newToken = new Token(stemmer.GetCurrent(), token.StartOffset(), token.EndOffset(), token.Type());
newToken.SetPositionIncrement(token.GetPositionIncrement());
return(newToken);
}
public QueryTermVector(System.String queryString, Analyzer analyzer)
{
if (analyzer != null)
{
TokenStream stream = analyzer.TokenStream("", new System.IO.StringReader(queryString));
if (stream != null)
{
Token next = null;
System.Collections.ArrayList terms = new System.Collections.ArrayList();
try
{
while ((next = stream.Next()) != null)
{
terms.Add(next.TermText());
}
ProcessTerms((System.String[])terms.ToArray(typeof(System.String)));
}
catch (System.IO.IOException)
{
}
}
}
}
/* (non-Javadoc)
* @see Lucene.Net.Highlight.FragmentScorer#scoreToken(org.apache.lucene.analysis.Token)
*/
public virtual float GetTokenScore(Token token)
{
System.String termText = token.TermText();
WeightedTerm queryTerm = (WeightedTerm) termsToFind[termText];
if (queryTerm == null)
{
//not a query term - return
return 0;
}
//found a query term - is it unique in this doc?
if (!uniqueTermsInFragment.Contains(termText))
{
totalScore += queryTerm.GetWeight();
uniqueTermsInFragment.Add(termText, termText);
}
return queryTerm.GetWeight();
}
// Tokenizes the fields of a document into Postings.
private void InvertDocument(Document doc)
{
foreach (Field field in doc.Fields())
{
System.String fieldName = field.Name();
int fieldNumber = fieldInfos.FieldNumber(fieldName);
int length = fieldLengths[fieldNumber]; // length of field
int position = fieldPositions[fieldNumber]; // position in field
if (length > 0)
{
position += analyzer.GetPositionIncrementGap(fieldName);
}
int offset = fieldOffsets[fieldNumber]; // offset field
if (field.IsIndexed())
{
if (!field.IsTokenized())
{
// un-tokenized field
System.String stringValue = field.StringValue();
if (field.IsStoreOffsetWithTermVector())
{
AddPosition(fieldName, stringValue, position++, new TermVectorOffsetInfo(offset, offset + stringValue.Length));
}
else
{
AddPosition(fieldName, stringValue, position++, null);
}
offset += stringValue.Length;
length++;
}
else
{
System.IO.TextReader reader; // find or make Reader
if (field.ReaderValue() != null)
{
reader = field.ReaderValue();
}
else if (field.StringValue() != null)
{
reader = new System.IO.StringReader(field.StringValue());
}
else
{
throw new System.ArgumentException("field must have either String or Reader value");
}
// Tokenize field and add to postingTable
TokenStream stream = analyzer.TokenStream(fieldName, reader);
try
{
Token lastToken = null;
for (Token t = stream.Next(); t != null; t = stream.Next())
{
position += (t.GetPositionIncrement() - 1);
if (field.IsStoreOffsetWithTermVector())
{
AddPosition(fieldName, t.TermText(), position++, new TermVectorOffsetInfo(offset + t.StartOffset(), offset + t.EndOffset()));
}
else
{
AddPosition(fieldName, t.TermText(), position++, null);
}
lastToken = t;
if (++length > maxFieldLength)
{
if (infoStream != null)
{
infoStream.WriteLine("maxFieldLength " + maxFieldLength + " reached, ignoring following tokens");
}
break;
}
}
if (lastToken != null)
{
offset += lastToken.EndOffset() + 1;
}
}
finally
{
stream.Close();
}
}
fieldLengths[fieldNumber] = length; // save field length
fieldPositions[fieldNumber] = position; // save field position
fieldBoosts[fieldNumber] *= field.GetBoost();
fieldOffsets[fieldNumber] = offset;
}
}
}
