lucene/analysis/common/src/test/org/apache/lucene/analysis/cz/TestCzechStemmer.java - lucene-solr - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package org.apache.lucene.analysis.cz;

 import java.io.IOException;
 import java.io.StringReader;
 import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.BaseTokenStreamTestCase;
 import org.apache.lucene.analysis.CharArraySet;
 import org.apache.lucene.analysis.MockTokenizer;
 import org.apache.lucene.analysis.Tokenizer;
 import org.apache.lucene.analysis.core.KeywordTokenizer;
 import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;

 /**
  * Test the Czech Stemmer.
  *
  * <p>Note: it's algorithmic, so some stems are nonsense
  */
 public class TestCzechStemmer extends BaseTokenStreamTestCase {

   /** Test showing how masculine noun forms conflate */
   public void testMasculineNouns() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();

     /* animate ending with a hard consonant */
     assertAnalyzesTo(cz, "pán", new String[] {"pán"});
     assertAnalyzesTo(cz, "páni", new String[] {"pán"});
     assertAnalyzesTo(cz, "pánové", new String[] {"pán"});
     assertAnalyzesTo(cz, "pána", new String[] {"pán"});
     assertAnalyzesTo(cz, "pánů", new String[] {"pán"});
     assertAnalyzesTo(cz, "pánovi", new String[] {"pán"});
     assertAnalyzesTo(cz, "pánům", new String[] {"pán"});
     assertAnalyzesTo(cz, "pány", new String[] {"pán"});
     assertAnalyzesTo(cz, "páne", new String[] {"pán"});
     assertAnalyzesTo(cz, "pánech", new String[] {"pán"});
     assertAnalyzesTo(cz, "pánem", new String[] {"pán"});

     /* inanimate ending with hard consonant */
     assertAnalyzesTo(cz, "hrad", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hradu", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hrade", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hradem", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hrady", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hradech", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hradům", new String[] {"hrad"});
     assertAnalyzesTo(cz, "hradů", new String[] {"hrad"});

     /* animate ending with a soft consonant */
     assertAnalyzesTo(cz, "muž", new String[] {"muh"});
     assertAnalyzesTo(cz, "muži", new String[] {"muh"});
     assertAnalyzesTo(cz, "muže", new String[] {"muh"});
     assertAnalyzesTo(cz, "mužů", new String[] {"muh"});
     assertAnalyzesTo(cz, "mužům", new String[] {"muh"});
     assertAnalyzesTo(cz, "mužích", new String[] {"muh"});
     assertAnalyzesTo(cz, "mužem", new String[] {"muh"});

     /* inanimate ending with a soft consonant */
     assertAnalyzesTo(cz, "stroj", new String[] {"stroj"});
     assertAnalyzesTo(cz, "stroje", new String[] {"stroj"});
     assertAnalyzesTo(cz, "strojů", new String[] {"stroj"});
     assertAnalyzesTo(cz, "stroji", new String[] {"stroj"});
     assertAnalyzesTo(cz, "strojům", new String[] {"stroj"});
     assertAnalyzesTo(cz, "strojích", new String[] {"stroj"});
     assertAnalyzesTo(cz, "strojem", new String[] {"stroj"});

     /* ending with a */
     assertAnalyzesTo(cz, "předseda", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedové", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedy", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedů", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedovi", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedům", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedu", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedo", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedech", new String[] {"předsd"});
     assertAnalyzesTo(cz, "předsedou", new String[] {"předsd"});

     /* ending with e */
     assertAnalyzesTo(cz, "soudce", new String[] {"soudk"});
     assertAnalyzesTo(cz, "soudci", new String[] {"soudk"});
     assertAnalyzesTo(cz, "soudců", new String[] {"soudk"});
     assertAnalyzesTo(cz, "soudcům", new String[] {"soudk"});
     assertAnalyzesTo(cz, "soudcích", new String[] {"soudk"});
     assertAnalyzesTo(cz, "soudcem", new String[] {"soudk"});

     cz.close();
   }

   /** Test showing how feminine noun forms conflate */
   public void testFeminineNouns() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();

     /* ending with hard consonant */
     assertAnalyzesTo(cz, "kost", new String[] {"kost"});
     assertAnalyzesTo(cz, "kosti", new String[] {"kost"});
     assertAnalyzesTo(cz, "kostí", new String[] {"kost"});
     assertAnalyzesTo(cz, "kostem", new String[] {"kost"});
     assertAnalyzesTo(cz, "kostech", new String[] {"kost"});
     assertAnalyzesTo(cz, "kostmi", new String[] {"kost"});

     /* ending with a soft consonant */
     // note: in this example sing nom. and sing acc. don't conflate w/ the rest
     assertAnalyzesTo(cz, "píseň", new String[] {"písň"});
     assertAnalyzesTo(cz, "písně", new String[] {"písn"});
     assertAnalyzesTo(cz, "písni", new String[] {"písn"});
     assertAnalyzesTo(cz, "písněmi", new String[] {"písn"});
     assertAnalyzesTo(cz, "písních", new String[] {"písn"});
     assertAnalyzesTo(cz, "písním", new String[] {"písn"});

     /* ending with e */
     assertAnalyzesTo(cz, "růže", new String[] {"růh"});
     assertAnalyzesTo(cz, "růží", new String[] {"růh"});
     assertAnalyzesTo(cz, "růžím", new String[] {"růh"});
     assertAnalyzesTo(cz, "růžích", new String[] {"růh"});
     assertAnalyzesTo(cz, "růžemi", new String[] {"růh"});
     assertAnalyzesTo(cz, "růži", new String[] {"růh"});

     /* ending with a */
     assertAnalyzesTo(cz, "žena", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženy", new String[] {"žn"});
     assertAnalyzesTo(cz, "žen", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženě", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženám", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženu", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženo", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženách", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženou", new String[] {"žn"});
     assertAnalyzesTo(cz, "ženami", new String[] {"žn"});

     cz.close();
   }

   /** Test showing how neuter noun forms conflate */
   public void testNeuterNouns() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();

     /* ending with o */
     assertAnalyzesTo(cz, "město", new String[] {"měst"});
     assertAnalyzesTo(cz, "města", new String[] {"měst"});
     assertAnalyzesTo(cz, "měst", new String[] {"měst"});
     assertAnalyzesTo(cz, "městu", new String[] {"měst"});
     assertAnalyzesTo(cz, "městům", new String[] {"měst"});
     assertAnalyzesTo(cz, "městě", new String[] {"měst"});
     assertAnalyzesTo(cz, "městech", new String[] {"měst"});
     assertAnalyzesTo(cz, "městem", new String[] {"měst"});
     assertAnalyzesTo(cz, "městy", new String[] {"měst"});

     /* ending with e */
     assertAnalyzesTo(cz, "moře", new String[] {"moř"});
     assertAnalyzesTo(cz, "moří", new String[] {"moř"});
     assertAnalyzesTo(cz, "mořím", new String[] {"moř"});
     assertAnalyzesTo(cz, "moři", new String[] {"moř"});
     assertAnalyzesTo(cz, "mořích", new String[] {"moř"});
     assertAnalyzesTo(cz, "mořem", new String[] {"moř"});

     /* ending with ě */
     assertAnalyzesTo(cz, "kuře", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřata", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřete", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřat", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřeti", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřatům", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřatech", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřetem", new String[] {"kuř"});
     assertAnalyzesTo(cz, "kuřaty", new String[] {"kuř"});

     /* ending with í */
     assertAnalyzesTo(cz, "stavení", new String[] {"stavn"});
     assertAnalyzesTo(cz, "stavením", new String[] {"stavn"});
     assertAnalyzesTo(cz, "staveních", new String[] {"stavn"});
     assertAnalyzesTo(cz, "staveními", new String[] {"stavn"});

     cz.close();
   }

   /** Test showing how adjectival forms conflate */
   public void testAdjectives() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();

     /* ending with ý/á/é */
     assertAnalyzesTo(cz, "mladý", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladí", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladého", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladých", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladému", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladým", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladé", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladém", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladými", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladá", new String[] {"mlad"});
     assertAnalyzesTo(cz, "mladou", new String[] {"mlad"});

     /* ending with í */
     assertAnalyzesTo(cz, "jarní", new String[] {"jarn"});
     assertAnalyzesTo(cz, "jarního", new String[] {"jarn"});
     assertAnalyzesTo(cz, "jarních", new String[] {"jarn"});
     assertAnalyzesTo(cz, "jarnímu", new String[] {"jarn"});
     assertAnalyzesTo(cz, "jarním", new String[] {"jarn"});
     assertAnalyzesTo(cz, "jarními", new String[] {"jarn"});

     cz.close();
   }

   /** Test some possessive suffixes */
   public void testPossessive() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();
     assertAnalyzesTo(cz, "Karlův", new String[] {"karl"});
     assertAnalyzesTo(cz, "jazykový", new String[] {"jazyk"});
     cz.close();
   }

   /** Test some exceptional rules, implemented as rewrites. */
   public void testExceptions() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();

     /* rewrite of št -> sk */
     assertAnalyzesTo(cz, "český", new String[] {"česk"});
     assertAnalyzesTo(cz, "čeští", new String[] {"česk"});

     /* rewrite of čt -> ck */
     assertAnalyzesTo(cz, "anglický", new String[] {"anglick"});
     assertAnalyzesTo(cz, "angličtí", new String[] {"anglick"});

     /* rewrite of z -> h */
     assertAnalyzesTo(cz, "kniha", new String[] {"knih"});
     assertAnalyzesTo(cz, "knize", new String[] {"knih"});

     /* rewrite of ž -> h */
     assertAnalyzesTo(cz, "mazat", new String[] {"mah"});
     assertAnalyzesTo(cz, "mažu", new String[] {"mah"});

     /* rewrite of c -> k */
     assertAnalyzesTo(cz, "kluk", new String[] {"kluk"});
     assertAnalyzesTo(cz, "kluci", new String[] {"kluk"});
     assertAnalyzesTo(cz, "klucích", new String[] {"kluk"});

     /* rewrite of č -> k */
     assertAnalyzesTo(cz, "hezký", new String[] {"hezk"});
     assertAnalyzesTo(cz, "hezčí", new String[] {"hezk"});

     /* rewrite of *ů* -> *o* */
     assertAnalyzesTo(cz, "hůl", new String[] {"hol"});
     assertAnalyzesTo(cz, "hole", new String[] {"hol"});

     /* rewrite of e* -> * */
     assertAnalyzesTo(cz, "deska", new String[] {"desk"});
     assertAnalyzesTo(cz, "desek", new String[] {"desk"});

     cz.close();
   }

   /** Test that very short words are not stemmed. */
   public void testDontStem() throws IOException {
     CzechAnalyzer cz = new CzechAnalyzer();
     assertAnalyzesTo(cz, "e", new String[] {"e"});
     assertAnalyzesTo(cz, "zi", new String[] {"zi"});
     cz.close();
   }

   public void testWithKeywordAttribute() throws IOException {
     CharArraySet set = new CharArraySet(1, true);
     set.add("hole");
     final MockTokenizer in = new MockTokenizer(MockTokenizer.WHITESPACE, false);
     in.setReader(new StringReader("hole desek"));
     CzechStemFilter filter = new CzechStemFilter(new SetKeywordMarkerFilter(in, set));
     assertTokenStreamContents(filter, new String[] {"hole", "desk"});
   }

   public void testEmptyTerm() throws IOException {
     Analyzer a =
         new Analyzer() {
           @Override
           protected TokenStreamComponents createComponents(String fieldName) {
             Tokenizer tokenizer = new KeywordTokenizer();
             return new TokenStreamComponents(tokenizer, new CzechStemFilter(tokenizer));
           }
         };
     checkOneTerm(a, "", "");
     a.close();
   }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package org.apache.lucene.analysis.cz;

	import java.io.IOException;
	import java.io.StringReader;
	import org.apache.lucene.analysis.Analyzer;
	import org.apache.lucene.analysis.BaseTokenStreamTestCase;
	import org.apache.lucene.analysis.CharArraySet;
	import org.apache.lucene.analysis.MockTokenizer;
	import org.apache.lucene.analysis.Tokenizer;
	import org.apache.lucene.analysis.core.KeywordTokenizer;
	import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;

	/**
	* Test the Czech Stemmer.
	*
	* <p>Note: it's algorithmic, so some stems are nonsense
	*/
	public class TestCzechStemmer extends BaseTokenStreamTestCase {

	/** Test showing how masculine noun forms conflate */
	public void testMasculineNouns() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();

	/* animate ending with a hard consonant */
	assertAnalyzesTo(cz, "pán", new String[] {"pán"});
	assertAnalyzesTo(cz, "páni", new String[] {"pán"});
	assertAnalyzesTo(cz, "pánové", new String[] {"pán"});
	assertAnalyzesTo(cz, "pána", new String[] {"pán"});
	assertAnalyzesTo(cz, "pánů", new String[] {"pán"});
	assertAnalyzesTo(cz, "pánovi", new String[] {"pán"});
	assertAnalyzesTo(cz, "pánům", new String[] {"pán"});
	assertAnalyzesTo(cz, "pány", new String[] {"pán"});
	assertAnalyzesTo(cz, "páne", new String[] {"pán"});
	assertAnalyzesTo(cz, "pánech", new String[] {"pán"});
	assertAnalyzesTo(cz, "pánem", new String[] {"pán"});

	/* inanimate ending with hard consonant */
	assertAnalyzesTo(cz, "hrad", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hradu", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hrade", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hradem", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hrady", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hradech", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hradům", new String[] {"hrad"});
	assertAnalyzesTo(cz, "hradů", new String[] {"hrad"});

	/* animate ending with a soft consonant */
	assertAnalyzesTo(cz, "muž", new String[] {"muh"});
	assertAnalyzesTo(cz, "muži", new String[] {"muh"});
	assertAnalyzesTo(cz, "muže", new String[] {"muh"});
	assertAnalyzesTo(cz, "mužů", new String[] {"muh"});
	assertAnalyzesTo(cz, "mužům", new String[] {"muh"});
	assertAnalyzesTo(cz, "mužích", new String[] {"muh"});
	assertAnalyzesTo(cz, "mužem", new String[] {"muh"});

	/* inanimate ending with a soft consonant */
	assertAnalyzesTo(cz, "stroj", new String[] {"stroj"});
	assertAnalyzesTo(cz, "stroje", new String[] {"stroj"});
	assertAnalyzesTo(cz, "strojů", new String[] {"stroj"});
	assertAnalyzesTo(cz, "stroji", new String[] {"stroj"});
	assertAnalyzesTo(cz, "strojům", new String[] {"stroj"});
	assertAnalyzesTo(cz, "strojích", new String[] {"stroj"});
	assertAnalyzesTo(cz, "strojem", new String[] {"stroj"});

	/* ending with a */
	assertAnalyzesTo(cz, "předseda", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedové", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedy", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedů", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedovi", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedům", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedu", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedo", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedech", new String[] {"předsd"});
	assertAnalyzesTo(cz, "předsedou", new String[] {"předsd"});

	/* ending with e */
	assertAnalyzesTo(cz, "soudce", new String[] {"soudk"});
	assertAnalyzesTo(cz, "soudci", new String[] {"soudk"});
	assertAnalyzesTo(cz, "soudců", new String[] {"soudk"});
	assertAnalyzesTo(cz, "soudcům", new String[] {"soudk"});
	assertAnalyzesTo(cz, "soudcích", new String[] {"soudk"});
	assertAnalyzesTo(cz, "soudcem", new String[] {"soudk"});

	cz.close();
	}

	/** Test showing how feminine noun forms conflate */
	public void testFeminineNouns() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();

	/* ending with hard consonant */
	assertAnalyzesTo(cz, "kost", new String[] {"kost"});
	assertAnalyzesTo(cz, "kosti", new String[] {"kost"});
	assertAnalyzesTo(cz, "kostí", new String[] {"kost"});
	assertAnalyzesTo(cz, "kostem", new String[] {"kost"});
	assertAnalyzesTo(cz, "kostech", new String[] {"kost"});
	assertAnalyzesTo(cz, "kostmi", new String[] {"kost"});

	/* ending with a soft consonant */
	// note: in this example sing nom. and sing acc. don't conflate w/ the rest
	assertAnalyzesTo(cz, "píseň", new String[] {"písň"});
	assertAnalyzesTo(cz, "písně", new String[] {"písn"});
	assertAnalyzesTo(cz, "písni", new String[] {"písn"});
	assertAnalyzesTo(cz, "písněmi", new String[] {"písn"});
	assertAnalyzesTo(cz, "písních", new String[] {"písn"});
	assertAnalyzesTo(cz, "písním", new String[] {"písn"});

	/* ending with e */
	assertAnalyzesTo(cz, "růže", new String[] {"růh"});
	assertAnalyzesTo(cz, "růží", new String[] {"růh"});
	assertAnalyzesTo(cz, "růžím", new String[] {"růh"});
	assertAnalyzesTo(cz, "růžích", new String[] {"růh"});
	assertAnalyzesTo(cz, "růžemi", new String[] {"růh"});
	assertAnalyzesTo(cz, "růži", new String[] {"růh"});

	/* ending with a */
	assertAnalyzesTo(cz, "žena", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženy", new String[] {"žn"});
	assertAnalyzesTo(cz, "žen", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženě", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženám", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženu", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženo", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženách", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženou", new String[] {"žn"});
	assertAnalyzesTo(cz, "ženami", new String[] {"žn"});

	cz.close();
	}

	/** Test showing how neuter noun forms conflate */
	public void testNeuterNouns() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();

	/* ending with o */
	assertAnalyzesTo(cz, "město", new String[] {"měst"});
	assertAnalyzesTo(cz, "města", new String[] {"měst"});
	assertAnalyzesTo(cz, "měst", new String[] {"měst"});
	assertAnalyzesTo(cz, "městu", new String[] {"měst"});
	assertAnalyzesTo(cz, "městům", new String[] {"měst"});
	assertAnalyzesTo(cz, "městě", new String[] {"měst"});
	assertAnalyzesTo(cz, "městech", new String[] {"měst"});
	assertAnalyzesTo(cz, "městem", new String[] {"měst"});
	assertAnalyzesTo(cz, "městy", new String[] {"měst"});

	/* ending with e */
	assertAnalyzesTo(cz, "moře", new String[] {"moř"});
	assertAnalyzesTo(cz, "moří", new String[] {"moř"});
	assertAnalyzesTo(cz, "mořím", new String[] {"moř"});
	assertAnalyzesTo(cz, "moři", new String[] {"moř"});
	assertAnalyzesTo(cz, "mořích", new String[] {"moř"});
	assertAnalyzesTo(cz, "mořem", new String[] {"moř"});

	/* ending with ě */
	assertAnalyzesTo(cz, "kuře", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřata", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřete", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřat", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřeti", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřatům", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřatech", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřetem", new String[] {"kuř"});
	assertAnalyzesTo(cz, "kuřaty", new String[] {"kuř"});

	/* ending with í */
	assertAnalyzesTo(cz, "stavení", new String[] {"stavn"});
	assertAnalyzesTo(cz, "stavením", new String[] {"stavn"});
	assertAnalyzesTo(cz, "staveních", new String[] {"stavn"});
	assertAnalyzesTo(cz, "staveními", new String[] {"stavn"});

	cz.close();
	}

	/** Test showing how adjectival forms conflate */
	public void testAdjectives() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();

	/* ending with ý/á/é */
	assertAnalyzesTo(cz, "mladý", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladí", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladého", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladých", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladému", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladým", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladé", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladém", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladými", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladá", new String[] {"mlad"});
	assertAnalyzesTo(cz, "mladou", new String[] {"mlad"});

	/* ending with í */
	assertAnalyzesTo(cz, "jarní", new String[] {"jarn"});
	assertAnalyzesTo(cz, "jarního", new String[] {"jarn"});
	assertAnalyzesTo(cz, "jarních", new String[] {"jarn"});
	assertAnalyzesTo(cz, "jarnímu", new String[] {"jarn"});
	assertAnalyzesTo(cz, "jarním", new String[] {"jarn"});
	assertAnalyzesTo(cz, "jarními", new String[] {"jarn"});

	cz.close();
	}

	/** Test some possessive suffixes */
	public void testPossessive() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();
	assertAnalyzesTo(cz, "Karlův", new String[] {"karl"});
	assertAnalyzesTo(cz, "jazykový", new String[] {"jazyk"});
	cz.close();
	}

	/** Test some exceptional rules, implemented as rewrites. */
	public void testExceptions() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();

	/* rewrite of št -> sk */
	assertAnalyzesTo(cz, "český", new String[] {"česk"});
	assertAnalyzesTo(cz, "čeští", new String[] {"česk"});

	/* rewrite of čt -> ck */
	assertAnalyzesTo(cz, "anglický", new String[] {"anglick"});
	assertAnalyzesTo(cz, "angličtí", new String[] {"anglick"});

	/* rewrite of z -> h */
	assertAnalyzesTo(cz, "kniha", new String[] {"knih"});
	assertAnalyzesTo(cz, "knize", new String[] {"knih"});

	/* rewrite of ž -> h */
	assertAnalyzesTo(cz, "mazat", new String[] {"mah"});
	assertAnalyzesTo(cz, "mažu", new String[] {"mah"});

	/* rewrite of c -> k */
	assertAnalyzesTo(cz, "kluk", new String[] {"kluk"});
	assertAnalyzesTo(cz, "kluci", new String[] {"kluk"});
	assertAnalyzesTo(cz, "klucích", new String[] {"kluk"});

	/* rewrite of č -> k */
	assertAnalyzesTo(cz, "hezký", new String[] {"hezk"});
	assertAnalyzesTo(cz, "hezčí", new String[] {"hezk"});

	/* rewrite of ů -> o */
	assertAnalyzesTo(cz, "hůl", new String[] {"hol"});
	assertAnalyzesTo(cz, "hole", new String[] {"hol"});

	/* rewrite of e* -> * */
	assertAnalyzesTo(cz, "deska", new String[] {"desk"});
	assertAnalyzesTo(cz, "desek", new String[] {"desk"});

	cz.close();
	}

	/** Test that very short words are not stemmed. */
	public void testDontStem() throws IOException {
	CzechAnalyzer cz = new CzechAnalyzer();
	assertAnalyzesTo(cz, "e", new String[] {"e"});
	assertAnalyzesTo(cz, "zi", new String[] {"zi"});
	cz.close();
	}

	public void testWithKeywordAttribute() throws IOException {
	CharArraySet set = new CharArraySet(1, true);
	set.add("hole");
	final MockTokenizer in = new MockTokenizer(MockTokenizer.WHITESPACE, false);
	in.setReader(new StringReader("hole desek"));
	CzechStemFilter filter = new CzechStemFilter(new SetKeywordMarkerFilter(in, set));
	assertTokenStreamContents(filter, new String[] {"hole", "desk"});
	}

	public void testEmptyTerm() throws IOException {
	Analyzer a =
	new Analyzer() {
	@Override
	protected TokenStreamComponents createComponents(String fieldName) {
	Tokenizer tokenizer = new KeywordTokenizer();
	return new TokenStreamComponents(tokenizer, new CzechStemFilter(tokenizer));
	}
	};
	checkOneTerm(a, "", "");
	a.close();
	}
	}