+++ /dev/null
-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.CharArraySet;
-import org.apache.lucene.analysis.KeywordMarkerFilter;
-import org.apache.lucene.analysis.LowerCaseFilter;
-import org.apache.lucene.analysis.ReusableAnalyzerBase;
-import org.apache.lucene.analysis.StopFilter;
-import org.apache.lucene.analysis.TokenStream;
-import org.apache.lucene.analysis.Tokenizer;
-import org.apache.lucene.analysis.WordlistLoader;
-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.util.Version;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.Reader;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Set;
-import java.util.Map;
-
-/**
- * {@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 must specify the required {@link Version}
- * compatibility when creating DutchAnalyzer:
- * <ul>
- * <li> As of 3.1, Snowball stemming is done with SnowballFilter,
- * LowerCaseFilter is used prior to StopFilter, and Snowball
- * stopwords are used by default.
- * <li> As of 2.9, StopFilter preserves position
- * increments
- * </ul>
- *
- * <p><b>NOTE</b>: This class uses the same {@link Version}
- * dependent settings as {@link StandardAnalyzer}.</p>
- */
-public final class DutchAnalyzer extends ReusableAnalyzerBase {
- /**
- * List of typical Dutch stopwords.
- * @deprecated use {@link #getDefaultStopSet()} instead
- */
- @Deprecated
- public final static String[] DUTCH_STOP_WORDS = getDefaultStopSet().toArray(new String[0]);
-
- /** 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 Set<?> getDefaultStopSet(){
- return DefaultSetHolder.DEFAULT_STOP_SET;
- }
-
- private static class DefaultSetHolder {
- static final Set<?> DEFAULT_STOP_SET;
-
- static {
- try {
- DEFAULT_STOP_SET = WordlistLoader.getSnowballWordSet(SnowballFilter.class,
- DEFAULT_STOPWORD_FILE);
- } 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");
- }
- }
- }
-
-
- /**
- * Contains the stopwords used with the StopFilter.
- */
- private final Set<?> stoptable;
-
- /**
- * Contains words that should be indexed but not stemmed.
- */
- private Set<?> excltable = Collections.emptySet();
-
- private Map<String, String> stemdict = new HashMap<String, String>();
- private final Version matchVersion;
-
- /**
- * Builds an analyzer with the default stop words ({@link #getDefaultStopSet()})
- * and a few default entries for the stem exclusion table.
- *
- */
- public DutchAnalyzer(Version matchVersion) {
- this(matchVersion, DefaultSetHolder.DEFAULT_STOP_SET);
- stemdict.put("fiets", "fiets"); //otherwise fiet
- stemdict.put("bromfiets", "bromfiets"); //otherwise bromfiet
- stemdict.put("ei", "eier");
- stemdict.put("kind", "kinder");
- }
-
- public DutchAnalyzer(Version matchVersion, Set<?> stopwords){
- this(matchVersion, stopwords, CharArraySet.EMPTY_SET);
- }
-
- public DutchAnalyzer(Version matchVersion, Set<?> stopwords, Set<?> stemExclusionTable){
- stoptable = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stopwords));
- excltable = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stemExclusionTable));
- this.matchVersion = matchVersion;
- }
-
- /**
- * Builds an analyzer with the given stop words.
- *
- * @param matchVersion
- * @param stopwords
- * @deprecated use {@link #DutchAnalyzer(Version, Set)} instead
- */
- @Deprecated
- public DutchAnalyzer(Version matchVersion, String... stopwords) {
- this(matchVersion, StopFilter.makeStopSet(matchVersion, stopwords));
- }
-
- /**
- * Builds an analyzer with the given stop words.
- *
- * @param stopwords
- * @deprecated use {@link #DutchAnalyzer(Version, Set)} instead
- */
- @Deprecated
- public DutchAnalyzer(Version matchVersion, HashSet<?> stopwords) {
- this(matchVersion, (Set<?>)stopwords);
- }
-
- /**
- * Builds an analyzer with the given stop words.
- *
- * @param stopwords
- * @deprecated use {@link #DutchAnalyzer(Version, Set)} instead
- */
- @Deprecated
- public DutchAnalyzer(Version matchVersion, File stopwords) {
- // this is completely broken!
- try {
- stoptable = org.apache.lucene.analysis.WordlistLoader.getWordSet(stopwords);
- } catch (IOException e) {
- // TODO: throw IOException
- throw new RuntimeException(e);
- }
- this.matchVersion = matchVersion;
- }
-
- /**
- * Builds an exclusionlist from an array of Strings.
- *
- * @param exclusionlist
- * @deprecated use {@link #DutchAnalyzer(Version, Set, Set)} instead
- */
- @Deprecated
- public void setStemExclusionTable(String... exclusionlist) {
- excltable = StopFilter.makeStopSet(matchVersion, exclusionlist);
- setPreviousTokenStream(null); // force a new stemmer to be created
- }
-
- /**
- * Builds an exclusionlist from a Hashtable.
- * @deprecated use {@link #DutchAnalyzer(Version, Set, Set)} instead
- */
- @Deprecated
- public void setStemExclusionTable(HashSet<?> exclusionlist) {
- excltable = exclusionlist;
- setPreviousTokenStream(null); // force a new stemmer to be created
- }
-
- /**
- * Builds an exclusionlist from the words contained in the given file.
- * @deprecated use {@link #DutchAnalyzer(Version, Set, Set)} instead
- */
- @Deprecated
- public void setStemExclusionTable(File exclusionlist) {
- try {
- excltable = org.apache.lucene.analysis.WordlistLoader.getWordSet(exclusionlist);
- setPreviousTokenStream(null); // force a new stemmer to be created
- } catch (IOException e) {
- // TODO: throw IOException
- throw new RuntimeException(e);
- }
- }
-
- /**
- * Reads a stemdictionary file , that overrules the stemming algorithm
- * This is a textfile that contains per line
- * <tt>word<b>\t</b>stem</tt>, i.e: two tab seperated words
- * @deprecated This prevents reuse of TokenStreams. If you wish to use a custom
- * stem dictionary, create your own Analyzer with {@link StemmerOverrideFilter}
- */
- @Deprecated
- public void setStemDictionary(File stemdictFile) {
- try {
- stemdict = WordlistLoader.getStemDict(stemdictFile);
- setPreviousTokenStream(null); // force a new stemmer to be created
- } catch (IOException e) {
- // TODO: throw IOException
- throw new RuntimeException(e);
- }
- }
-
-
- /**
- * 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 KeywordMarkerFilter} if a stem exclusion set is provided,
- * {@link StemmerOverrideFilter}, and {@link SnowballFilter}
- */
- @Override
- protected TokenStreamComponents createComponents(String fieldName,
- Reader aReader) {
- if (matchVersion.onOrAfter(Version.LUCENE_31)) {
- final Tokenizer source = new StandardTokenizer(matchVersion, aReader);
- TokenStream result = new StandardFilter(matchVersion, source);
- result = new LowerCaseFilter(matchVersion, result);
- result = new StopFilter(matchVersion, result, stoptable);
- if (!excltable.isEmpty())
- result = new KeywordMarkerFilter(result, excltable);
- if (!stemdict.isEmpty())
- result = new StemmerOverrideFilter(matchVersion, result, stemdict);
- result = new SnowballFilter(result, new org.tartarus.snowball.ext.DutchStemmer());
- return new TokenStreamComponents(source, result);
- } else {
- final Tokenizer source = new StandardTokenizer(matchVersion, aReader);
- TokenStream result = new StandardFilter(matchVersion, source);
- result = new StopFilter(matchVersion, result, stoptable);
- if (!excltable.isEmpty())
- result = new KeywordMarkerFilter(result, excltable);
- result = new DutchStemFilter(result, stemdict);
- return new TokenStreamComponents(source, result);
- }
- }
-}
fnp / pylucene.git / blobdiff