+++ /dev/null
-package org.apache.lucene.analysis.de;
-// This file is encoded in UTF-8
-
-/**
- * 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 java.io.File;
-import java.io.IOException;
-import java.io.Reader;
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.lucene.analysis.Analyzer;
-import org.apache.lucene.analysis.CharArraySet;
-import org.apache.lucene.analysis.LowerCaseFilter;
-import org.apache.lucene.analysis.KeywordMarkerFilter;
-import org.apache.lucene.analysis.StopFilter;
-import org.apache.lucene.analysis.StopwordAnalyzerBase;
-import org.apache.lucene.analysis.TokenStream;
-import org.apache.lucene.analysis.Tokenizer;
-import org.apache.lucene.analysis.WordlistLoader;
-import org.apache.lucene.analysis.snowball.SnowballFilter;
-import org.apache.lucene.analysis.standard.StandardAnalyzer;
-import org.apache.lucene.analysis.standard.StandardFilter;
-import org.apache.lucene.analysis.standard.StandardTokenizer;
-import org.apache.lucene.util.Version;
-import org.tartarus.snowball.ext.German2Stemmer;
-
-/**
- * {@link Analyzer} for German language.
- * <p>
- * Supports an external list of stopwords (words that
- * will not be indexed at all) and an external list of exclusions (word that will
- * not be stemmed, but indexed).
- * 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 GermanAnalyzer:
- * <ul>
- * <li> As of 3.1, Snowball stemming is done with SnowballFilter, 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 GermanAnalyzer extends StopwordAnalyzerBase {
-
- /**
- * List of typical german stopwords.
- * @deprecated use {@link #getDefaultStopSet()} instead
- */
- @Deprecated
- public final static String[] GERMAN_STOP_WORDS = {
- "einer", "eine", "eines", "einem", "einen",
- "der", "die", "das", "dass", "daß",
- "du", "er", "sie", "es",
- "was", "wer", "wie", "wir",
- "und", "oder", "ohne", "mit",
- "am", "im", "in", "aus", "auf",
- "ist", "sein", "war", "wird",
- "ihr", "ihre", "ihres",
- "als", "für", "von", "mit",
- "dich", "dir", "mich", "mir",
- "mein", "sein", "kein",
- "durch", "wegen", "wird"
- };
-
- /** File containing default German stopwords. */
- public final static String DEFAULT_STOPWORD_FILE = "german_stop.txt";
-
- /**
- * Returns a set of default German-stopwords
- * @return a set of default German-stopwords
- */
- public static final Set<?> getDefaultStopSet(){
- return DefaultSetHolder.DEFAULT_SET;
- }
-
- private static class DefaultSetHolder {
- /** @deprecated remove in Lucene 5.0 */
- @Deprecated
- private static final Set<?> DEFAULT_SET_30 = CharArraySet.unmodifiableSet(new CharArraySet(
- Version.LUCENE_CURRENT, Arrays.asList(GERMAN_STOP_WORDS), false));
- private static final Set<?> DEFAULT_SET;
- static {
- try {
- DEFAULT_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 {@link StopFilter}.
- */
-
- /**
- * Contains words that should be indexed but not stemmed.
- */
- // TODO make this final in 3.1
- private Set<?> exclusionSet;
-
- /**
- * Builds an analyzer with the default stop words:
- * {@link #getDefaultStopSet()}.
- */
- public GermanAnalyzer(Version matchVersion) {
- this(matchVersion,
- matchVersion.onOrAfter(Version.LUCENE_31) ? DefaultSetHolder.DEFAULT_SET
- : DefaultSetHolder.DEFAULT_SET_30);
- }
-
- /**
- * Builds an analyzer with the given stop words
- *
- * @param matchVersion
- * lucene compatibility version
- * @param stopwords
- * a stopword set
- */
- public GermanAnalyzer(Version matchVersion, Set<?> stopwords) {
- this(matchVersion, stopwords, CharArraySet.EMPTY_SET);
- }
-
- /**
- * Builds an analyzer with the given stop words
- *
- * @param matchVersion
- * lucene compatibility version
- * @param stopwords
- * a stopword set
- * @param stemExclusionSet
- * a stemming exclusion set
- */
- public GermanAnalyzer(Version matchVersion, Set<?> stopwords, Set<?> stemExclusionSet) {
- super(matchVersion, stopwords);
- exclusionSet = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion, stemExclusionSet));
- }
-
- /**
- * Builds an analyzer with the given stop words.
- * @deprecated use {@link #GermanAnalyzer(Version, Set)}
- */
- @Deprecated
- public GermanAnalyzer(Version matchVersion, String... stopwords) {
- this(matchVersion, StopFilter.makeStopSet(matchVersion, stopwords));
- }
-
- /**
- * Builds an analyzer with the given stop words.
- * @deprecated use {@link #GermanAnalyzer(Version, Set)}
- */
- @Deprecated
- public GermanAnalyzer(Version matchVersion, Map<?,?> stopwords) {
- this(matchVersion, stopwords.keySet());
-
- }
-
- /**
- * Builds an analyzer with the given stop words.
- * @deprecated use {@link #GermanAnalyzer(Version, Set)}
- */
- @Deprecated
- public GermanAnalyzer(Version matchVersion, File stopwords) throws IOException {
- this(matchVersion, WordlistLoader.getWordSet(stopwords));
- }
-
- /**
- * Builds an exclusionlist from an array of Strings.
- * @deprecated use {@link #GermanAnalyzer(Version, Set, Set)} instead
- */
- @Deprecated
- public void setStemExclusionTable(String[] exclusionlist) {
- exclusionSet = StopFilter.makeStopSet(matchVersion, exclusionlist);
- setPreviousTokenStream(null); // force a new stemmer to be created
- }
-
- /**
- * Builds an exclusionlist from a {@link Map}
- * @deprecated use {@link #GermanAnalyzer(Version, Set, Set)} instead
- */
- @Deprecated
- public void setStemExclusionTable(Map<?,?> exclusionlist) {
- exclusionSet = new HashSet<Object>(exclusionlist.keySet());
- setPreviousTokenStream(null); // force a new stemmer to be created
- }
-
- /**
- * Builds an exclusionlist from the words contained in the given file.
- * @deprecated use {@link #GermanAnalyzer(Version, Set, Set)} instead
- */
- @Deprecated
- public void setStemExclusionTable(File exclusionlist) throws IOException {
- exclusionSet = WordlistLoader.getWordSet(exclusionlist);
- setPreviousTokenStream(null); // force a new stemmer to be created
- }
-
- /**
- * Creates
- * {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents}
- * used to tokenize all the text in the provided {@link Reader}.
- *
- * @return {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents}
- * built from a {@link StandardTokenizer} filtered with
- * {@link StandardFilter}, {@link LowerCaseFilter}, {@link StopFilter}
- * , {@link KeywordMarkerFilter} if a stem exclusion set is
- * provided, and {@link SnowballFilter}
- */
- @Override
- protected TokenStreamComponents createComponents(String fieldName,
- Reader reader) {
- final Tokenizer source = new StandardTokenizer(matchVersion, reader);
- TokenStream result = new StandardFilter(matchVersion, source);
- result = new LowerCaseFilter(matchVersion, result);
- result = new StopFilter( matchVersion, result, stopwords);
- result = new KeywordMarkerFilter(result, exclusionSet);
- if (matchVersion.onOrAfter(Version.LUCENE_31))
- result = new SnowballFilter(result, new German2Stemmer());
- else
- result = new GermanStemFilter(result);
- return new TokenStreamComponents(source, result);
- }
-}
fnp / pylucene.git / blobdiff