+++ /dev/null
-package org.apache.lucene.analysis.snowball;
-
-/**
- * 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.*;
-import org.apache.lucene.analysis.en.EnglishPossessiveFilter;
-import org.apache.lucene.analysis.standard.*;
-import org.apache.lucene.analysis.tr.TurkishLowerCaseFilter;
-import org.apache.lucene.util.Version;
-
-import java.io.IOException;
-import java.io.Reader;
-import java.util.Set;
-
-/** Filters {@link StandardTokenizer} with {@link StandardFilter}, {@link
- * LowerCaseFilter}, {@link StopFilter} and {@link SnowballFilter}.
- *
- * Available stemmers are listed in org.tartarus.snowball.ext. The name of a
- * stemmer is the part of the class name before "Stemmer", e.g., the stemmer in
- * {@link org.tartarus.snowball.ext.EnglishStemmer} is named "English".
- *
- * <p><b>NOTE</b>: This class uses the same {@link Version}
- * dependent settings as {@link StandardAnalyzer}, with the following addition:
- * <ul>
- * <li> As of 3.1, uses {@link TurkishLowerCaseFilter} for Turkish language.
- * </ul>
- * </p>
- * @deprecated Use the language-specific analyzer in contrib/analyzers instead.
- * This analyzer will be removed in Lucene 5.0
- */
-@Deprecated
-public final class SnowballAnalyzer extends Analyzer {
- private String name;
- private Set<?> stopSet;
- private final Version matchVersion;
-
- /** Builds the named analyzer with no stop words. */
- public SnowballAnalyzer(Version matchVersion, String name) {
- this.name = name;
- this.matchVersion = matchVersion;
- }
-
- /**
- * Builds the named analyzer with the given stop words.
- * @deprecated Use {@link #SnowballAnalyzer(Version, String, Set)} instead.
- */
- @Deprecated
- public SnowballAnalyzer(Version matchVersion, String name, String[] stopWords) {
- this(matchVersion, name);
- stopSet = StopFilter.makeStopSet(matchVersion, stopWords);
- }
-
- /** Builds the named analyzer with the given stop words. */
- public SnowballAnalyzer(Version matchVersion, String name, Set<?> stopWords) {
- this(matchVersion, name);
- stopSet = CharArraySet.unmodifiableSet(CharArraySet.copy(matchVersion,
- stopWords));
- }
-
- /** Constructs a {@link StandardTokenizer} filtered by a {@link
- StandardFilter}, a {@link LowerCaseFilter}, a {@link StopFilter},
- and a {@link SnowballFilter} */
- @Override
- public TokenStream tokenStream(String fieldName, Reader reader) {
- TokenStream result = new StandardTokenizer(matchVersion, reader);
- result = new StandardFilter(matchVersion, result);
- // remove the possessive 's for english stemmers
- if (matchVersion.onOrAfter(Version.LUCENE_31) &&
- (name.equals("English") || name.equals("Porter") || name.equals("Lovins")))
- result = new EnglishPossessiveFilter(result);
- // Use a special lowercase filter for turkish, the stemmer expects it.
- if (matchVersion.onOrAfter(Version.LUCENE_31) && name.equals("Turkish"))
- result = new TurkishLowerCaseFilter(result);
- else
- result = new LowerCaseFilter(matchVersion, result);
- if (stopSet != null)
- result = new StopFilter(matchVersion,
- result, stopSet);
- result = new SnowballFilter(result, name);
- return result;
- }
-
- private class SavedStreams {
- Tokenizer source;
- TokenStream result;
- }
-
- /** Returns a (possibly reused) {@link StandardTokenizer} filtered by a
- * {@link StandardFilter}, a {@link LowerCaseFilter},
- * a {@link StopFilter}, and a {@link SnowballFilter} */
- @Override
- public TokenStream reusableTokenStream(String fieldName, Reader reader)
- throws IOException {
- SavedStreams streams = (SavedStreams) getPreviousTokenStream();
- if (streams == null) {
- streams = new SavedStreams();
- streams.source = new StandardTokenizer(matchVersion, reader);
- streams.result = new StandardFilter(matchVersion, streams.source);
- // Use a special lowercase filter for turkish, the stemmer expects it.
- if (matchVersion.onOrAfter(Version.LUCENE_31) && name.equals("Turkish"))
- streams.result = new TurkishLowerCaseFilter(streams.result);
- else
- streams.result = new LowerCaseFilter(matchVersion, streams.result);
- if (stopSet != null)
- streams.result = new StopFilter(matchVersion,
- streams.result, stopSet);
- streams.result = new SnowballFilter(streams.result, name);
- setPreviousTokenStream(streams);
- } else {
- streams.source.reset(reader);
- }
- return streams.result;
- }
-}
fnp / pylucene.git / blobdiff