--- /dev/null
+package org.apache.lucene.analysis.el;
+
+/**
+ * Copyright 2005 The Apache Software Foundation
+ *
+ * Licensed 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.StopFilter;
+import org.apache.lucene.analysis.StopwordAnalyzerBase;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.Tokenizer;
+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.IOException;
+import java.io.Reader;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * {@link Analyzer} for the Greek 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>
+ *
+ * <a name="version"/>
+ * <p>You must specify the required {@link Version}
+ * compatibility when creating GreekAnalyzer:
+ * <ul>
+ * <li> As of 3.1, StandardFilter and GreekStemmer 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 GreekAnalyzer extends StopwordAnalyzerBase {
+ /** File containing default Greek stopwords. */
+ public final static String DEFAULT_STOPWORD_FILE = "stopwords.txt";
+
+ /**
+ * Returns a set of default Greek-stopwords
+ * @return a set of default Greek-stopwords
+ */
+ public static final Set<?> getDefaultStopSet(){
+ return DefaultSetHolder.DEFAULT_SET;
+ }
+
+ private static class DefaultSetHolder {
+ private static final Set<?> DEFAULT_SET;
+
+ static {
+ try {
+ DEFAULT_SET = loadStopwordSet(false, GreekAnalyzer.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");
+ }
+ }
+ }
+
+ /**
+ * Builds an analyzer with the default stop words.
+ * @param matchVersion Lucene compatibility version,
+ * See <a href="#version">above</a>
+ */
+ public GreekAnalyzer(Version matchVersion) {
+ this(matchVersion, DefaultSetHolder.DEFAULT_SET);
+ }
+
+ /**
+ * Builds an analyzer with the given stop words.
+ * <p>
+ * <b>NOTE:</b> The stopwords set should be pre-processed with the logic of
+ * {@link GreekLowerCaseFilter} for best results.
+ *
+ * @param matchVersion Lucene compatibility version,
+ * See <a href="#version">above</a>
+ * @param stopwords a stopword set
+ */
+ public GreekAnalyzer(Version matchVersion, Set<?> stopwords) {
+ super(matchVersion, stopwords);
+ }
+
+ /**
+ * Builds an analyzer with the given stop words.
+ * @param stopwords Array of stopwords to use.
+ * @deprecated use {@link #GreekAnalyzer(Version, Set)} instead
+ */
+ @Deprecated
+ public GreekAnalyzer(Version matchVersion, String... stopwords) {
+ this(matchVersion, StopFilter.makeStopSet(matchVersion, stopwords));
+ }
+
+ /**
+ * Builds an analyzer with the given stop words.
+ * @deprecated use {@link #GreekAnalyzer(Version, Set)} instead
+ */
+ @Deprecated
+ public GreekAnalyzer(Version matchVersion, Map<?,?> stopwords) {
+ this(matchVersion, stopwords.keySet());
+ }
+
+ /**
+ * 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 GreekLowerCaseFilter}, {@link StandardFilter},
+ * {@link StopFilter}, and {@link GreekStemFilter}
+ */
+ @Override
+ protected TokenStreamComponents createComponents(String fieldName,
+ Reader reader) {
+ final Tokenizer source = new StandardTokenizer(matchVersion, reader);
+ TokenStream result = new GreekLowerCaseFilter(matchVersion, source);
+ if (matchVersion.onOrAfter(Version.LUCENE_31))
+ result = new StandardFilter(matchVersion, result);
+ result = new StopFilter(matchVersion, result, stopwords);
+ if (matchVersion.onOrAfter(Version.LUCENE_31))
+ result = new GreekStemFilter(result);
+ return new TokenStreamComponents(source, result);
+ }
+}