/*
* DrakkarKeel - An Enterprise Collaborative Search Platform
*
* The contents of this file are subject under the terms described in the
* DRAKKARKEEL_LICENSE file included in this distribution; you may not use this
* file except in compliance with the License.
*
* 2013-2014 DrakkarKeel Platform.
*/
package drakkar.mast.retrieval.analysis;
import java.io.IOException;
import java.io.Reader;
import java.util.HashSet;
import java.util.Set;
import org.apache.lucene.analysis.*;
/**
* Analizador para indexar y buscar documentos con Lucene utilizando filtros para stopwords y stemming
*
*/
public class StopStemAnalyzer extends Analyzer {
Set<String> stopwords = getStopWordsList();
private static final String[] ENGLISH_STOP_WORDS = {
"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",
"@author", "@param", "@return", "@deprecated", "@see", "@serial", "@since", "@serial",
"@throws", "@code", "@link", "<i>", "</i>", "<pre>", "</pre>", "<blockquote>", "</blockquote>",
"<br>", "</br>", "<b>", "</b>", "<tt>", "</tt>", "@linkplain", "<p>", "<a href=", "</a>",
"public", "void", "private", "protected", "final", "asbtract", "class", "sttatic","return"};
/**
*
*/
public StopStemAnalyzer() {
}
/**
*
* @param fieldName
* @param reader
* @return
*/
public TokenStream tokenStream(String fieldName, Reader reader) {
TokenStream stream = new LowerCaseTokenizer(reader);
stream = new StopFilter(true, stream, stopwords, true);
// stream = new PorterStemFilter(stream);
return stream;
}
/**
*
* @param fieldName
* @param reader
* @return
* @throws IOException
*/
@Override
public TokenStream reusableTokenStream(String fieldName, Reader reader) throws
IOException {
SavedStreams streams = (SavedStreams) getPreviousTokenStream();
if (streams == null) {
streams = new SavedStreams();
streams.source = new LowerCaseTokenizer(reader);
streams.result = new StopFilter(true, streams.source, stopwords, true);
// streams.result = new PorterStemFilter(streams.source);
setPreviousTokenStream(streams);
} else {
streams.source.reset(reader);
}
return streams.result;
}
private Set<String> getStopWordsList() {
Set<String> list = new HashSet<String>();
for (int i = 0; i < ENGLISH_STOP_WORDS.length; i++) {
String string = ENGLISH_STOP_WORDS[i];
list.add(string);
}
return list;
}
/** Filters LowerCaseTokenizer with StopFilter,PorterStemFilter */
private class SavedStreams {
Tokenizer source;
TokenStream result;
};
}