| /* |
| * 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. |
| */ |
| |
| using System; |
| using System.Collections.Generic; |
| using System.IO; |
| using System.Text; |
| using System.Collections; |
| |
| using Lucene.Net.Analysis; |
| using Lucene.Net.Analysis.De; |
| using Lucene.Net.Analysis.Standard; |
| using Version = Lucene.Net.Util.Version; |
| |
| namespace Lucene.Net.Analysis.Cz |
| { |
| /* |
| * {@link Analyzer} for Czech language. |
| * <p> |
| * Supports an external list of stopwords (words that |
| * will not be indexed at all). |
| * A default set of stopwords is used unless an alternative list is specified. |
| * </p> |
| * |
| * <p><b>NOTE</b>: This class uses the same {@link Version} |
| * dependent settings as {@link StandardAnalyzer}.</p> |
| */ |
| public sealed class CzechAnalyzer : Analyzer { |
| |
| /* |
| * List of typical stopwords. |
| * @deprecated use {@link #getDefaultStopSet()} instead |
| */ |
| // TODO make this private in 3.1 |
| public static readonly String[] CZECH_STOP_WORDS = { |
| "a","s","k","o","i","u","v","z","dnes","cz","t\u00edmto","bude\u0161","budem", |
| "byli","jse\u0161","m\u016fj","sv\u00fdm","ta","tomto","tohle","tuto","tyto", |
| "jej","zda","pro\u010d","m\u00e1te","tato","kam","tohoto","kdo","kte\u0159\u00ed", |
| "mi","n\u00e1m","tom","tomuto","m\u00edt","nic","proto","kterou","byla", |
| "toho","proto\u017ee","asi","ho","na\u0161i","napi\u0161te","re","co\u017e","t\u00edm", |
| "tak\u017ee","sv\u00fdch","jej\u00ed","sv\u00fdmi","jste","aj","tu","tedy","teto", |
| "bylo","kde","ke","prav\u00e9","ji","nad","nejsou","\u010di","pod","t\u00e9ma", |
| "mezi","p\u0159es","ty","pak","v\u00e1m","ani","kdy\u017e","v\u0161ak","neg","jsem", |
| "tento","\u010dl\u00e1nku","\u010dl\u00e1nky","aby","jsme","p\u0159ed","pta","jejich", |
| "byl","je\u0161t\u011b","a\u017e","bez","tak\u00e9","pouze","prvn\u00ed","va\u0161e","kter\u00e1", |
| "n\u00e1s","nov\u00fd","tipy","pokud","m\u016f\u017ee","strana","jeho","sv\u00e9","jin\u00e9", |
| "zpr\u00e1vy","nov\u00e9","nen\u00ed","v\u00e1s","jen","podle","zde","u\u017e","b\u00fdt","v\u00edce", |
| "bude","ji\u017e","ne\u017e","kter\u00fd","by","kter\u00e9","co","nebo","ten","tak", |
| "m\u00e1","p\u0159i","od","po","jsou","jak","dal\u0161\u00ed","ale","si","se","ve", |
| "to","jako","za","zp\u011bt","ze","do","pro","je","na","atd","atp", |
| "jakmile","p\u0159i\u010dem\u017e","j\u00e1","on","ona","ono","oni","ony","my","vy", |
| "j\u00ed","ji","m\u011b","mne","jemu","tomu","t\u011bm","t\u011bmu","n\u011bmu","n\u011bmu\u017e", |
| "jeho\u017e","j\u00ed\u017e","jeliko\u017e","je\u017e","jako\u017e","na\u010de\u017e", |
| }; |
| |
| /* |
| * Returns a set of default Czech-stopwords |
| * @return a set of default Czech-stopwords |
| */ |
| public static ISet<string> getDefaultStopSet(){ |
| return DefaultSetHolder.DEFAULT_SET; |
| } |
| |
| private static class DefaultSetHolder { |
| internal static ISet<string> DEFAULT_SET = CharArraySet.UnmodifiableSet(new CharArraySet( |
| (IEnumerable<string>)CZECH_STOP_WORDS, false)); |
| } |
| |
| /* |
| * Contains the stopwords used with the {@link StopFilter}. |
| */ |
| // TODO make this final in 3.1 |
| private ISet<string> stoptable; |
| private readonly Version matchVersion; |
| |
| /* |
| * Builds an analyzer with the default stop words ({@link #CZECH_STOP_WORDS}). |
| */ |
| public CzechAnalyzer(Version matchVersion) |
| : this(matchVersion, DefaultSetHolder.DEFAULT_SET) |
| { |
| |
| } |
| |
| /* |
| * Builds an analyzer with the given stop words and stemming exclusion words |
| * |
| * @param matchVersion |
| * lucene compatibility version |
| * @param stopwords |
| * a stopword set |
| */ |
| public CzechAnalyzer(Version matchVersion, ISet<string> stopwords) { |
| this.matchVersion = matchVersion; |
| this.stoptable = CharArraySet.UnmodifiableSet(CharArraySet.Copy(stopwords)); |
| } |
| |
| |
| /* |
| * Builds an analyzer with the given stop words. |
| * @deprecated use {@link #CzechAnalyzer(Version, Set)} instead |
| */ |
| public CzechAnalyzer(Version matchVersion, params string[] stopwords) |
| : this(matchVersion, StopFilter.MakeStopSet( stopwords )) |
| { |
| |
| } |
| |
| /* |
| * Builds an analyzer with the given stop words. |
| * |
| * @deprecated use {@link #CzechAnalyzer(Version, Set)} instead |
| */ |
| public CzechAnalyzer(Version matchVersion, HashSet<string> stopwords) |
| : this(matchVersion, (ISet<string>)stopwords) |
| { |
| |
| } |
| |
| /* |
| * Builds an analyzer with the given stop words. |
| * @deprecated use {@link #CzechAnalyzer(Version, Set)} instead |
| */ |
| public CzechAnalyzer(Version matchVersion, FileInfo stopwords ) |
| : this(matchVersion, WordlistLoader.GetWordSet( stopwords )) |
| { |
| |
| } |
| |
| /* |
| * Loads stopwords hash from resource stream (file, database...). |
| * @param wordfile File containing the wordlist |
| * @param encoding Encoding used (win-1250, iso-8859-2, ...), null for default system encoding |
| * @deprecated use {@link WordlistLoader#getWordSet(Reader, String) } |
| * and {@link #CzechAnalyzer(Version, Set)} instead |
| */ |
| public void LoadStopWords( Stream wordfile, System.Text.Encoding encoding ) { |
| PreviousTokenStream = null; // force a new stopfilter to be created |
| if ( wordfile == null ) |
| { |
| stoptable = Support.Compatibility.SetFactory.CreateHashSet<string>(); |
| return; |
| } |
| try { |
| // clear any previous table (if present) |
| stoptable = Support.Compatibility.SetFactory.CreateHashSet<string>(); |
| |
| StreamReader isr; |
| if (encoding == null) |
| isr = new StreamReader(wordfile); |
| else |
| isr = new StreamReader(wordfile, encoding); |
| |
| stoptable = WordlistLoader.GetWordSet(isr); |
| } catch ( IOException) { |
| // clear any previous table (if present) |
| // TODO: throw IOException |
| stoptable = Support.Compatibility.SetFactory.CreateHashSet<string>(); |
| } |
| } |
| |
| /* |
| * Creates a {@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}, and {@link StopFilter} |
| */ |
| public override sealed TokenStream TokenStream( String fieldName, TextReader reader ) { |
| TokenStream result = new StandardTokenizer( matchVersion, reader ); |
| result = new StandardFilter( result ); |
| result = new LowerCaseFilter( result ); |
| result = new StopFilter( StopFilter.GetEnablePositionIncrementsVersionDefault(matchVersion), |
| result, stoptable ); |
| return result; |
| } |
| |
| private class SavedStreams { |
| protected internal Tokenizer source; |
| protected internal TokenStream result; |
| }; |
| |
| /* |
| * 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}, and {@link StopFilter} |
| */ |
| public override TokenStream ReusableTokenStream(String fieldName, TextReader reader) |
| { |
| SavedStreams streams = (SavedStreams) PreviousTokenStream; |
| if (streams == null) { |
| streams = new SavedStreams(); |
| streams.source = new StandardTokenizer(matchVersion, reader); |
| streams.result = new StandardFilter(streams.source); |
| streams.result = new LowerCaseFilter(streams.result); |
| streams.result = new StopFilter(StopFilter.GetEnablePositionIncrementsVersionDefault(matchVersion), |
| streams.result, stoptable); |
| PreviousTokenStream = streams; |
| } else { |
| streams.source.Reset(reader); |
| } |
| return streams.result; |
| } |
| } |
| |
| |
| } |
