X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/StopAnalyzer.java
diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/StopAnalyzer.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/StopAnalyzer.java
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+package org.apache.lucene.analysis;
+
+/**
+ * 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.Set;
+import java.util.List;
+
+import org.apache.lucene.util.IOUtils;
+import org.apache.lucene.util.Version;
+
+/** Filters {@link LetterTokenizer} with {@link LowerCaseFilter} and {@link StopFilter}.
+ *
+ *
+ *
You must specify the required {@link Version}
+ * compatibility when creating StopAnalyzer:
+ *
+ * - As of 3.1, StopFilter correctly handles Unicode 4.0
+ * supplementary characters in stopwords
+ *
- As of 2.9, position increments are preserved
+ *
+*/
+
+public final class StopAnalyzer extends StopwordAnalyzerBase {
+
+ /** An unmodifiable set containing some common English words that are not usually useful
+ for searching.*/
+ public static final Set> ENGLISH_STOP_WORDS_SET;
+
+ static {
+ final List stopWords = Arrays.asList(
+ "a", "an", "and", "are", "as", "at", "be", "but", "by",
+ "for", "if", "in", "into", "is", "it",
+ "no", "not", "of", "on", "or", "such",
+ "that", "the", "their", "then", "there", "these",
+ "they", "this", "to", "was", "will", "with"
+ );
+ final CharArraySet stopSet = new CharArraySet(Version.LUCENE_CURRENT,
+ stopWords.size(), false);
+ stopSet.addAll(stopWords);
+ ENGLISH_STOP_WORDS_SET = CharArraySet.unmodifiableSet(stopSet);
+ }
+
+ /** Builds an analyzer which removes words in
+ * {@link #ENGLISH_STOP_WORDS_SET}.
+ * @param matchVersion See above
+ */
+ public StopAnalyzer(Version matchVersion) {
+ this(matchVersion, ENGLISH_STOP_WORDS_SET);
+ }
+
+ /** Builds an analyzer with the stop words from the given set.
+ * @param matchVersion See above
+ * @param stopWords Set of stop words */
+ public StopAnalyzer(Version matchVersion, Set> stopWords) {
+ super(matchVersion, stopWords);
+ }
+
+ /** Builds an analyzer with the stop words from the given file.
+ * @see WordlistLoader#getWordSet(Reader, Version)
+ * @param matchVersion See above
+ * @param stopwordsFile File to load stop words from */
+ public StopAnalyzer(Version matchVersion, File stopwordsFile) throws IOException {
+ this(matchVersion, WordlistLoader.getWordSet(IOUtils.getDecodingReader(stopwordsFile,
+ IOUtils.CHARSET_UTF_8), matchVersion));
+ }
+
+ /** Builds an analyzer with the stop words from the given reader.
+ * @see WordlistLoader#getWordSet(Reader, Version)
+ * @param matchVersion See above
+ * @param stopwords Reader to load stop words from */
+ public StopAnalyzer(Version matchVersion, Reader stopwords) throws IOException {
+ this(matchVersion, WordlistLoader.getWordSet(stopwords, matchVersion));
+ }
+
+ /**
+ * 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 LowerCaseTokenizer} filtered with
+ * {@link StopFilter}
+ */
+ @Override
+ protected TokenStreamComponents createComponents(String fieldName,
+ Reader reader) {
+ final Tokenizer source = new LowerCaseTokenizer(matchVersion, reader);
+ return new TokenStreamComponents(source, new StopFilter(matchVersion,
+ source, stopwords));
+ }
+}
+