core/org.eclipse.smila.solr/lib/source/org/apache/lucene/analysis/nl/DutchAnalyzer.java - smila/org.eclipse.smila.core - Git at Google

 package org.apache.lucene.analysis.nl;

 /*
  * 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.
  */

 import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.core.LowerCaseFilter;
 import org.apache.lucene.analysis.core.StopFilter;
 import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;
 import org.apache.lucene.analysis.miscellaneous.StemmerOverrideFilter.StemmerOverrideMap;
 import org.apache.lucene.analysis.TokenStream;
 import org.apache.lucene.analysis.Tokenizer;
 import org.apache.lucene.analysis.miscellaneous.StemmerOverrideFilter;
 import org.apache.lucene.analysis.snowball.SnowballFilter;
 import org.apache.lucene.analysis.standard.StandardFilter;
 import org.apache.lucene.analysis.standard.StandardTokenizer;
 import org.apache.lucene.analysis.standard.StandardAnalyzer;  // for javadoc
 import org.apache.lucene.analysis.util.CharArrayMap;
 import org.apache.lucene.analysis.util.CharArraySet;
 import org.apache.lucene.analysis.util.WordlistLoader;
 import org.apache.lucene.util.CharsRef;
 import org.apache.lucene.util.CharsRefBuilder;
 import org.apache.lucene.util.IOUtils;
 import org.apache.lucene.util.Version;

 import java.io.IOException;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;

 /**
  * {@link Analyzer} for Dutch language.
  * <p>
  * Supports an external list of stopwords (words that
  * will not be indexed at all), an external list of exclusions (word that will
  * not be stemmed, but indexed) and an external list of word-stem pairs that overrule
  * the algorithm (dictionary stemming).
  * A default set of stopwords is used unless an alternative list is specified, but the
  * exclusion list is empty by default.
  * </p>
  *
  * <a name="version"/>
  * <p>You may specify the {@link Version}
  * compatibility when creating DutchAnalyzer:
  * <ul>
  *   <li> As of 3.6, {@link #DutchAnalyzer(Version, CharArraySet)} and
  *        {@link #DutchAnalyzer(Version, CharArraySet, CharArraySet)} also populate
  *        the default entries for the stem override dictionary
  *   <li> As of 3.1, Snowball stemming is done with SnowballFilter,
  *        LowerCaseFilter is used prior to StopFilter, and Snowball
  *        stopwords are used by default.
  * </ul>
  *
  * <p><b>NOTE</b>: This class uses the same {@link Version}
  * dependent settings as {@link StandardAnalyzer}.</p>
  */
 // TODO: extend StopwordAnalyzerBase
 public final class DutchAnalyzer extends Analyzer {

   /** File containing default Dutch stopwords. */
   public final static String DEFAULT_STOPWORD_FILE = "dutch_stop.txt";

   /**
    * Returns an unmodifiable instance of the default stop-words set.
    * @return an unmodifiable instance of the default stop-words set.
    */
   public static CharArraySet getDefaultStopSet(){
     return DefaultSetHolder.DEFAULT_STOP_SET;
   }

   private static class DefaultSetHolder {
     static final CharArraySet DEFAULT_STOP_SET;
     static final CharArrayMap<String> DEFAULT_STEM_DICT;
     static {
       try {
         DEFAULT_STOP_SET = WordlistLoader.getSnowballWordSet(IOUtils.getDecodingReader(SnowballFilter.class,
             DEFAULT_STOPWORD_FILE, StandardCharsets.UTF_8));
       } catch (IOException ex) {
         // default set should always be present as it is part of the
         // distribution (JAR)
         throw new RuntimeException("Unable to load default stopword set");
       }

       DEFAULT_STEM_DICT = new CharArrayMap<>(4, false);
       DEFAULT_STEM_DICT.put("fiets", "fiets"); //otherwise fiet
       DEFAULT_STEM_DICT.put("bromfiets", "bromfiets"); //otherwise bromfiet
       DEFAULT_STEM_DICT.put("ei", "eier");
       DEFAULT_STEM_DICT.put("kind", "kinder");
     }
   }


   /**
    * Contains the stopwords used with the StopFilter.
    */
   private final CharArraySet stoptable;

   /**
    * Contains words that should be indexed but not stemmed.
    */
   private CharArraySet excltable = CharArraySet.EMPTY_SET;

   private final StemmerOverrideMap stemdict;

   // null if on 3.1 or later - only for bw compat
   private final CharArrayMap<String> origStemdict;

   /**
    * Builds an analyzer with the default stop words ({@link #getDefaultStopSet()})
    * and a few default entries for the stem exclusion table.
    *
    */
   public DutchAnalyzer() {
     this(Version.LATEST);
   }

   /**
    * @deprecated Use {@link #DutchAnalyzer()}
    */
   @Deprecated
   public DutchAnalyzer(Version matchVersion) {
     // historically, only this ctor populated the stem dict!!!!!
     this(matchVersion, DefaultSetHolder.DEFAULT_STOP_SET, CharArraySet.EMPTY_SET, DefaultSetHolder.DEFAULT_STEM_DICT);
   }

   public DutchAnalyzer(CharArraySet stopwords){
     this(Version.LATEST, stopwords);
   }

   /**
    * @deprecated Use {@link #DutchAnalyzer(CharArraySet)}
    */
   @Deprecated
   public DutchAnalyzer(Version matchVersion, CharArraySet stopwords){
     // historically, this ctor never the stem dict!!!!!
     // so we populate it only for >= 3.6
     this(matchVersion, stopwords, CharArraySet.EMPTY_SET,
         matchVersion.onOrAfter(Version.LUCENE_3_6)
         ? DefaultSetHolder.DEFAULT_STEM_DICT
         : CharArrayMap.<String>emptyMap());
   }

   public DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable){
     this(Version.LATEST, stopwords, stemExclusionTable);
   }

   /**
    * @deprecated Use {@link #DutchAnalyzer(CharArraySet,CharArraySet)}
    */
   @Deprecated
   public DutchAnalyzer(Version matchVersion, CharArraySet stopwords, CharArraySet stemExclusionTable){
     // historically, this ctor never the stem dict!!!!!
     // so we populate it only for >= 3.6
     this(matchVersion, stopwords, stemExclusionTable,
         matchVersion.onOrAfter(Version.LUCENE_3_6)
         ? DefaultSetHolder.DEFAULT_STEM_DICT
         : CharArrayMap.<String>emptyMap());
   }

   public DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable, CharArrayMap<String> stemOverrideDict) {
     this(Version.LATEST, stopwords, stemExclusionTable, stemOverrideDict);
   }

   /**
    * @deprecated Use {@link #DutchAnalyzer(CharArraySet,CharArraySet,CharArrayMap)}
    */
   @Deprecated
   public DutchAnalyzer(Version matchVersion, CharArraySet stopwords, CharArraySet stemExclusionTable, CharArrayMap<String> stemOverrideDict) {
     setVersion(matchVersion);
     this.stoptable = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stopwords));
     this.excltable = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stemExclusionTable));
     if (stemOverrideDict.isEmpty() || !matchVersion.onOrAfter(Version.LUCENE_3_1)) {
       this.stemdict = null;
       this.origStemdict = CharArrayMap.unmodifiableMap(CharArrayMap.copy(matchVersion, stemOverrideDict));
     } else {
       this.origStemdict = null;
       // we don't need to ignore case here since we lowercase in this analyzer anyway
       StemmerOverrideFilter.Builder builder = new StemmerOverrideFilter.Builder(false);
       CharArrayMap<String>.EntryIterator iter = stemOverrideDict.entrySet().iterator();
       CharsRefBuilder spare = new CharsRefBuilder();
       while (iter.hasNext()) {
         char[] nextKey = iter.nextKey();
         spare.copyChars(nextKey, 0, nextKey.length);
         builder.add(spare.get(), iter.currentValue());
       }
       try {
         this.stemdict = builder.build();
       } catch (IOException ex) {
         throw new RuntimeException("can not build stem dict", ex);
       }
     }
   }

   /**
    * Returns a (possibly reused) {@link TokenStream} which tokenizes all the
    * text in the provided {@link Reader}.
    *
    * @return A {@link TokenStream} built from a {@link StandardTokenizer}
    *   filtered with {@link StandardFilter}, {@link LowerCaseFilter},
    *   {@link StopFilter}, {@link SetKeywordMarkerFilter} if a stem exclusion set is provided,
    *   {@link StemmerOverrideFilter}, and {@link SnowballFilter}
    */
   @Override
   protected TokenStreamComponents createComponents(String fieldName,
       Reader aReader) {
     if (getVersion().onOrAfter(Version.LUCENE_3_1)) {
       final Tokenizer source = new StandardTokenizer(getVersion(), aReader);
       TokenStream result = new StandardFilter(getVersion(), source);
       result = new LowerCaseFilter(getVersion(), result);
       result = new StopFilter(getVersion(), result, stoptable);
       if (!excltable.isEmpty())
         result = new SetKeywordMarkerFilter(result, excltable);
       if (stemdict != null)
         result = new StemmerOverrideFilter(result, stemdict);
       result = new SnowballFilter(result, new org.tartarus.snowball.ext.DutchStemmer());
       return new TokenStreamComponents(source, result);
     } else {
       final Tokenizer source = new StandardTokenizer(getVersion(), aReader);
       TokenStream result = new StandardFilter(getVersion(), source);
       result = new StopFilter(getVersion(), result, stoptable);
       if (!excltable.isEmpty())
         result = new SetKeywordMarkerFilter(result, excltable);
       result = new DutchStemFilter(result, origStemdict);
       return new TokenStreamComponents(source, result);
     }
   }
 }
	package org.apache.lucene.analysis.nl;

	/*
	* 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.
	*/

	import org.apache.lucene.analysis.Analyzer;
	import org.apache.lucene.analysis.core.LowerCaseFilter;
	import org.apache.lucene.analysis.core.StopFilter;
	import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter;
	import org.apache.lucene.analysis.miscellaneous.StemmerOverrideFilter.StemmerOverrideMap;
	import org.apache.lucene.analysis.TokenStream;
	import org.apache.lucene.analysis.Tokenizer;
	import org.apache.lucene.analysis.miscellaneous.StemmerOverrideFilter;
	import org.apache.lucene.analysis.snowball.SnowballFilter;
	import org.apache.lucene.analysis.standard.StandardFilter;
	import org.apache.lucene.analysis.standard.StandardTokenizer;
	import org.apache.lucene.analysis.standard.StandardAnalyzer; // for javadoc
	import org.apache.lucene.analysis.util.CharArrayMap;
	import org.apache.lucene.analysis.util.CharArraySet;
	import org.apache.lucene.analysis.util.WordlistLoader;
	import org.apache.lucene.util.CharsRef;
	import org.apache.lucene.util.CharsRefBuilder;
	import org.apache.lucene.util.IOUtils;
	import org.apache.lucene.util.Version;

	import java.io.IOException;
	import java.io.Reader;
	import java.nio.charset.StandardCharsets;

	/**
	* {@link Analyzer} for Dutch language.
	* <p>
	* Supports an external list of stopwords (words that
	* will not be indexed at all), an external list of exclusions (word that will
	* not be stemmed, but indexed) and an external list of word-stem pairs that overrule
	* the algorithm (dictionary stemming).
	* A default set of stopwords is used unless an alternative list is specified, but the
	* exclusion list is empty by default.
	* </p>
	*
	* <a name="version"/>
	* <p>You may specify the {@link Version}
	* compatibility when creating DutchAnalyzer:
	* <ul>
	* <li> As of 3.6, {@link #DutchAnalyzer(Version, CharArraySet)} and
	* {@link #DutchAnalyzer(Version, CharArraySet, CharArraySet)} also populate
	* the default entries for the stem override dictionary
	* <li> As of 3.1, Snowball stemming is done with SnowballFilter,
	* LowerCaseFilter is used prior to StopFilter, and Snowball
	* stopwords are used by default.
	* </ul>
	*
	* <p><b>NOTE</b>: This class uses the same {@link Version}
	* dependent settings as {@link StandardAnalyzer}.</p>
	*/
	// TODO: extend StopwordAnalyzerBase
	public final class DutchAnalyzer extends Analyzer {

	/** File containing default Dutch stopwords. */
	public final static String DEFAULT_STOPWORD_FILE = "dutch_stop.txt";

	/**
	* Returns an unmodifiable instance of the default stop-words set.
	* @return an unmodifiable instance of the default stop-words set.
	*/
	public static CharArraySet getDefaultStopSet(){
	return DefaultSetHolder.DEFAULT_STOP_SET;
	}

	private static class DefaultSetHolder {
	static final CharArraySet DEFAULT_STOP_SET;
	static final CharArrayMap<String> DEFAULT_STEM_DICT;
	static {
	try {
	DEFAULT_STOP_SET = WordlistLoader.getSnowballWordSet(IOUtils.getDecodingReader(SnowballFilter.class,
	DEFAULT_STOPWORD_FILE, StandardCharsets.UTF_8));
	} catch (IOException ex) {
	// default set should always be present as it is part of the
	// distribution (JAR)
	throw new RuntimeException("Unable to load default stopword set");
	}

	DEFAULT_STEM_DICT = new CharArrayMap<>(4, false);
	DEFAULT_STEM_DICT.put("fiets", "fiets"); //otherwise fiet
	DEFAULT_STEM_DICT.put("bromfiets", "bromfiets"); //otherwise bromfiet
	DEFAULT_STEM_DICT.put("ei", "eier");
	DEFAULT_STEM_DICT.put("kind", "kinder");
	}
	}


	/**
	* Contains the stopwords used with the StopFilter.
	*/
	private final CharArraySet stoptable;

	/**
	* Contains words that should be indexed but not stemmed.
	*/
	private CharArraySet excltable = CharArraySet.EMPTY_SET;

	private final StemmerOverrideMap stemdict;

	// null if on 3.1 or later - only for bw compat
	private final CharArrayMap<String> origStemdict;

	/**
	* Builds an analyzer with the default stop words ({@link #getDefaultStopSet()})
	* and a few default entries for the stem exclusion table.
	*
	*/
	public DutchAnalyzer() {
	this(Version.LATEST);
	}

	/**
	* @deprecated Use {@link #DutchAnalyzer()}
	*/
	@Deprecated
	public DutchAnalyzer(Version matchVersion) {
	// historically, only this ctor populated the stem dict!!!!!
	this(matchVersion, DefaultSetHolder.DEFAULT_STOP_SET, CharArraySet.EMPTY_SET, DefaultSetHolder.DEFAULT_STEM_DICT);
	}

	public DutchAnalyzer(CharArraySet stopwords){
	this(Version.LATEST, stopwords);
	}

	/**
	* @deprecated Use {@link #DutchAnalyzer(CharArraySet)}
	*/
	@Deprecated
	public DutchAnalyzer(Version matchVersion, CharArraySet stopwords){
	// historically, this ctor never the stem dict!!!!!
	// so we populate it only for >= 3.6
	this(matchVersion, stopwords, CharArraySet.EMPTY_SET,
	matchVersion.onOrAfter(Version.LUCENE_3_6)
	? DefaultSetHolder.DEFAULT_STEM_DICT
	: CharArrayMap.<String>emptyMap());
	}

	public DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable){
	this(Version.LATEST, stopwords, stemExclusionTable);
	}

	/**
	* @deprecated Use {@link #DutchAnalyzer(CharArraySet,CharArraySet)}
	*/
	@Deprecated
	public DutchAnalyzer(Version matchVersion, CharArraySet stopwords, CharArraySet stemExclusionTable){
	// historically, this ctor never the stem dict!!!!!
	// so we populate it only for >= 3.6
	this(matchVersion, stopwords, stemExclusionTable,
	matchVersion.onOrAfter(Version.LUCENE_3_6)
	? DefaultSetHolder.DEFAULT_STEM_DICT
	: CharArrayMap.<String>emptyMap());
	}

	public DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable, CharArrayMap<String> stemOverrideDict) {
	this(Version.LATEST, stopwords, stemExclusionTable, stemOverrideDict);
	}

	/**
	* @deprecated Use {@link #DutchAnalyzer(CharArraySet,CharArraySet,CharArrayMap)}
	*/
	@Deprecated
	public DutchAnalyzer(Version matchVersion, CharArraySet stopwords, CharArraySet stemExclusionTable, CharArrayMap<String> stemOverrideDict) {
	setVersion(matchVersion);
	this.stoptable = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stopwords));
	this.excltable = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stemExclusionTable));
	if (stemOverrideDict.isEmpty() \|\| !matchVersion.onOrAfter(Version.LUCENE_3_1)) {
	this.stemdict = null;
	this.origStemdict = CharArrayMap.unmodifiableMap(CharArrayMap.copy(matchVersion, stemOverrideDict));
	} else {
	this.origStemdict = null;
	// we don't need to ignore case here since we lowercase in this analyzer anyway
	StemmerOverrideFilter.Builder builder = new StemmerOverrideFilter.Builder(false);
	CharArrayMap<String>.EntryIterator iter = stemOverrideDict.entrySet().iterator();
	CharsRefBuilder spare = new CharsRefBuilder();
	while (iter.hasNext()) {
	char[] nextKey = iter.nextKey();
	spare.copyChars(nextKey, 0, nextKey.length);
	builder.add(spare.get(), iter.currentValue());
	}
	try {
	this.stemdict = builder.build();
	} catch (IOException ex) {
	throw new RuntimeException("can not build stem dict", ex);
	}
	}
	}

	/**
	* Returns a (possibly reused) {@link TokenStream} which tokenizes all the
	* text in the provided {@link Reader}.
	*
	* @return A {@link TokenStream} built from a {@link StandardTokenizer}
	* filtered with {@link StandardFilter}, {@link LowerCaseFilter},
	* {@link StopFilter}, {@link SetKeywordMarkerFilter} if a stem exclusion set is provided,
	* {@link StemmerOverrideFilter}, and {@link SnowballFilter}
	*/
	@Override
	protected TokenStreamComponents createComponents(String fieldName,
	Reader aReader) {
	if (getVersion().onOrAfter(Version.LUCENE_3_1)) {
	final Tokenizer source = new StandardTokenizer(getVersion(), aReader);
	TokenStream result = new StandardFilter(getVersion(), source);
	result = new LowerCaseFilter(getVersion(), result);
	result = new StopFilter(getVersion(), result, stoptable);
	if (!excltable.isEmpty())
	result = new SetKeywordMarkerFilter(result, excltable);
	if (stemdict != null)
	result = new StemmerOverrideFilter(result, stemdict);
	result = new SnowballFilter(result, new org.tartarus.snowball.ext.DutchStemmer());
	return new TokenStreamComponents(source, result);
	} else {
	final Tokenizer source = new StandardTokenizer(getVersion(), aReader);
	TokenStream result = new StandardFilter(getVersion(), source);
	result = new StopFilter(getVersion(), result, stoptable);
	if (!excltable.isEmpty())
	result = new SetKeywordMarkerFilter(result, excltable);
	result = new DutchStemFilter(result, origStemdict);
	return new TokenStreamComponents(source, result);
	}
	}
	}