public virtual void TestFrontUnigram()
{
#pragma warning disable 612, 618
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, input, EdgeNGramTokenFilter.Side.FRONT, 1, 1);
#pragma warning restore 612, 618
AssertTokenStreamContents(tokenizer, new string[] { "a" }, new int[] { 0 }, new int[] { 5 });
}
public virtual void TestBackUnigram()
{
#pragma warning disable 612, 618
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(LuceneVersion.LUCENE_43, input, EdgeNGramTokenFilter.Side.BACK, 1, 1);
#pragma warning restore 612, 618
AssertTokenStreamContents(tokenizer, new string[] { "e" }, new int[] { 4 }, new int[] { 5 });
}
public virtual void TestBackRangeOfNgrams()
{
#pragma warning disable 612, 618
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(LuceneVersion.LUCENE_43, input, EdgeNGramTokenFilter.Side.BACK, 1, 3);
#pragma warning restore 612, 618
AssertTokenStreamContents(tokenizer, new string[] { "e", "de", "cde" }, new int[] { 4, 3, 2 }, new int[] { 5, 5, 5 }, null, null, null, null, false);
}
public virtual void TestOversizedNgrams()
{
#pragma warning disable 612, 618
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, input, EdgeNGramTokenFilter.Side.FRONT, 6, 6);
#pragma warning restore 612, 618
AssertTokenStreamContents(tokenizer, new string[0], new int[0], new int[0]);
}
public virtual void TestSmallTokenInStream()
{
input = new MockTokenizer(new StringReader("abc de fgh"), MockTokenizer.WHITESPACE, false);
#pragma warning disable 612, 618
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, input, EdgeNGramTokenFilter.Side.FRONT, 3, 3);
#pragma warning restore 612, 618
AssertTokenStreamContents(tokenizer, new string[] { "abc", "fgh" }, new int[] { 0, 7 }, new int[] { 3, 10 });
}
public virtual void TestGraphs()
{
TokenStream tk = new LetterTokenizer(TEST_VERSION_CURRENT, new StringReader("abc d efgh ij klmno p q"));
tk = new ShingleFilter(tk);
tk = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, tk, 7, 10);
AssertTokenStreamContents(tk, new string[] { "efgh ij", "ij klmn", "ij klmno", "klmno p" }, new int[] { 6, 11, 11, 14 }, new int[] { 13, 19, 19, 21 }, new int[] { 3, 1, 0, 1 }, new int[] { 2, 2, 2, 2 }, 23);
}
public virtual void TestFilterPositions()
{
TokenStream ts = new MockTokenizer(new StringReader("abcde vwxyz"), MockTokenizer.WHITESPACE, false);
#pragma warning disable 612, 618
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, ts, EdgeNGramTokenFilter.Side.FRONT, 1, 3);
#pragma warning restore 612, 618
AssertTokenStreamContents(tokenizer, new string[] { "a", "ab", "abc", "v", "vw", "vwx" }, new int[] { 0, 0, 0, 6, 6, 6 }, new int[] { 5, 5, 5, 11, 11, 11 }, null, new int[] { 1, 0, 0, 1, 0, 0 }, null, null, false);
}
protected override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
{
Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
TokenFilter filters = new ASCIIFoldingFilter(tokenizer);
#pragma warning disable 612, 618
filters = new EdgeNGramTokenFilter(LuceneVersion.LUCENE_43, filters, EdgeNGramTokenFilter.Side.FRONT, 2, 15);
#pragma warning restore 612, 618
return(new TokenStreamComponents(tokenizer, filters));
}
public virtual void TestReset()
{
WhitespaceTokenizer tokenizer = new WhitespaceTokenizer(TEST_VERSION_CURRENT, new StringReader("abcde"));
#pragma warning disable 612, 618
EdgeNGramTokenFilter filter = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, tokenizer, EdgeNGramTokenFilter.Side.FRONT, 1, 3);
#pragma warning restore 612, 618
AssertTokenStreamContents(filter, new string[] { "a", "ab", "abc" }, new int[] { 0, 0, 0 }, new int[] { 5, 5, 5 });
tokenizer.SetReader(new StringReader("abcde"));
AssertTokenStreamContents(filter, new string[] { "a", "ab", "abc" }, new int[] { 0, 0, 0 }, new int[] { 5, 5, 5 });
}
public override TokenStream TokenStream(string fieldName, System.IO.TextReader reader)
{
TokenStream result = new StandardTokenizer(kLuceneVersion, reader);
result = new StandardFilter(result);
result = new LowerCaseFilter(result);
result = new ASCIIFoldingFilter(result);
result = new StopFilter(false, result, StopFilter.MakeStopSet(kEnglishStopWords));
result = new EdgeNGramTokenFilter(
result, Lucene.Net.Analysis.NGram.EdgeNGramTokenFilter.Side.FRONT, 1, 20);
return result;
}
public virtual void TestFirstTokenPositionIncrement()
{
TokenStream ts = new MockTokenizer(new StringReader("a abc"), MockTokenizer.WHITESPACE, false);
ts = new PositionFilter(ts); // All but first token will get 0 position increment
#pragma warning disable 612, 618
EdgeNGramTokenFilter filter = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, ts, EdgeNGramTokenFilter.Side.FRONT, 2, 3);
#pragma warning restore 612, 618
// The first token "a" will not be output, since it's smaller than the mingram size of 2.
// The second token on input to EdgeNGramTokenFilter will have position increment of 0,
// which should be increased to 1, since this is the first output token in the stream.
AssertTokenStreamContents(filter, new string[] { "ab", "abc" }, new int[] { 2, 2 }, new int[] { 5, 5 }, new int[] { 1, 0 });
}
public virtual void TestInvalidOffsets()
{
Analyzer analyzer = Analyzer.NewAnonymous(createComponents: (fieldName, reader) =>
{
Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
TokenFilter filters = new ASCIIFoldingFilter(tokenizer);
#pragma warning disable 612, 618
filters = new EdgeNGramTokenFilter(LuceneVersion.LUCENE_43, filters, EdgeNGramTokenFilter.Side.FRONT, 2, 15);
#pragma warning restore 612, 618
return(new TokenStreamComponents(tokenizer, filters));
});
AssertAnalyzesTo(analyzer, "mosfellsbær", new string[] { "mo", "mos", "mosf", "mosfe", "mosfel", "mosfell", "mosfells", "mosfellsb", "mosfellsba", "mosfellsbae", "mosfellsbaer" }, new int[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, new int[] { 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11 });
}
public override TokenStream TokenStream(string fieldName, TextReader reader)
{
//Apply standard tokenizer to input
var tokenizedInput = new StandardTokenizer(_version, reader);
//Apply standard, lowercase and English stop words filters to input
var filteredInput = new SnowballFilter(new StopFilter(true, new LowerCaseFilter(new StandardFilter(tokenizedInput)),
StopAnalyzer.ENGLISH_STOP_WORDS_SET), new EnglishStemmer());
//Apply EdgeNGram filter to front of words
//Min size of grams max size of grams
var grammedInput = new EdgeNGramTokenFilter(filteredInput, Side.FRONT, _mingram, _maxgram);
return grammedInput;
}
public virtual void TestSupplementaryCharacters()
{
string s = TestUtil.RandomUnicodeString(Random(), 10);
int codePointCount = s.CodePointCount(0, s.Length);
int minGram = TestUtil.NextInt(Random(), 1, 3);
int maxGram = TestUtil.NextInt(Random(), minGram, 10);
TokenStream tk = new KeywordTokenizer(new StringReader(s));
tk = new EdgeNGramTokenFilter(TEST_VERSION_CURRENT, tk, minGram, maxGram);
ICharTermAttribute termAtt = tk.AddAttribute <ICharTermAttribute>();
IOffsetAttribute offsetAtt = tk.AddAttribute <IOffsetAttribute>();
tk.Reset();
for (int i = minGram; i <= Math.Min(codePointCount, maxGram); ++i)
{
assertTrue(tk.IncrementToken());
assertEquals(0, offsetAtt.StartOffset);
assertEquals(s.Length, offsetAtt.EndOffset);
int end = Character.OffsetByCodePoints(s, 0, i);
assertEquals(s.Substring(0, end), termAtt.ToString());
}
assertFalse(tk.IncrementToken());
}
public override TokenStream TokenStream(string fieldName, System.IO.TextReader reader)
{
TokenStream result = new StandardTokenizer(kLuceneVersion, reader);
result = new StandardFilter(result);
result = new LowerCaseFilter(result);
result = new ASCIIFoldingFilter(result);
result = new StopFilter(false, result, StopFilter.MakeStopSet(kEnglishStopWords));
//// Note: this was found on stackoverflow: http://stackoverflow.com/questions/120180/how-to-do-query-auto-completion-suggestions-in-lucene
result = new EdgeNGramTokenFilter(
result, Lucene.Net.Analysis.NGram.EdgeNGramTokenFilter.Side.FRONT, 1, 20);
return result;
}
public void TestFrontRangeOfNgrams()
{
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(input, EdgeNGramTokenFilter.Side.FRONT, 1, 3);
AssertTokenStreamContents(tokenizer, new String[] { "a", "ab", "abc" }, new int[] { 0, 0, 0 }, new int[] { 1, 2, 3 });
}
public void TestBackRangeOfNgrams()
{
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(input, EdgeNGramTokenFilter.Side.BACK, 1, 3);
AssertTokenStreamContents(tokenizer, new String[] { "e", "de", "cde" }, new int[] { 4, 3, 2 }, new int[] { 5, 5, 5 });
}
public void TestSmallTokenInStream()
{
input = new WhitespaceTokenizer(new StringReader("abc de fgh"));
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(input, EdgeNGramTokenFilter.Side.FRONT, 3, 3);
AssertTokenStreamContents(tokenizer, new String[] { "abc", "fgh" }, new int[] { 0, 7 }, new int[] { 3, 10 });
}
public void TestReset()
{
WhitespaceTokenizer tokenizer = new WhitespaceTokenizer(new StringReader("abcde"));
EdgeNGramTokenFilter filter = new EdgeNGramTokenFilter(tokenizer, EdgeNGramTokenFilter.Side.FRONT, 1, 3);
AssertTokenStreamContents(filter, new String[] { "a", "ab", "abc" }, new int[] { 0, 0, 0 }, new int[] { 1, 2, 3 });
tokenizer.Reset(new StringReader("abcde"));
AssertTokenStreamContents(filter, new String[] { "a", "ab", "abc" }, new int[] { 0, 0, 0 }, new int[] { 1, 2, 3 });
}
public void TestFrontUnigram()
{
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(input, EdgeNGramTokenFilter.Side.FRONT, 1, 1);
AssertTokenStreamContents(tokenizer, new String[] { "a" }, new int[] { 0 }, new int[] { 1 });
}
public void TestBackUnigram()
{
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(input, EdgeNGramTokenFilter.Side.BACK, 1, 1);
AssertTokenStreamContents(tokenizer, new String[] { "e" }, new int[] { 4 }, new int[] { 5 });
}
public void TestOversizedNgrams()
{
EdgeNGramTokenFilter tokenizer = new EdgeNGramTokenFilter(input, EdgeNGramTokenFilter.Side.FRONT, 6, 6);
AssertTokenStreamContents(tokenizer, new String[0], new int[0], new int[0]);
}
