package org.apache.lucene.analysis.synonym;
/*
* 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.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.text.ParseException;
import java.util.List;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.core.WhitespaceTokenizer;
import org.apache.lucene.analysis.synonym.SynonymFilter;
import org.apache.lucene.analysis.synonym.SynonymMap;
import org.apache.lucene.analysis.synonym.SolrSynonymParser;
import org.apache.lucene.analysis.synonym.WordnetSynonymParser;
import org.apache.lucene.analysis.util.*;
import org.apache.lucene.util.Version;
/**
* @deprecated (3.4) use {@link SynonymFilterFactory} instead. this is only a backwards compatibility
* mechanism that will be removed in Lucene 5.0
*/
// NOTE: rename this to "SynonymFilterFactory" and nuke that delegator in Lucene 5.0!
@Deprecated
final class FSTSynonymFilterFactory extends TokenFilterFactory implements ResourceLoaderAware {
private SynonymMap map;
private boolean ignoreCase;
@Override
public TokenStream create(TokenStream input) {
// if the fst is null, it means there's actually no synonyms... just return the original stream
// as there is nothing to do here.
return map.fst == null ? input : new SynonymFilter(input, map, ignoreCase);
}
@Override
public void inform(ResourceLoader loader) throws IOException {
final boolean ignoreCase = getBoolean("ignoreCase", false);
this.ignoreCase = ignoreCase;
String tf = args.get("tokenizerFactory");
final TokenizerFactory factory = tf == null ? null : loadTokenizerFactory(loader, tf);
Analyzer analyzer = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer tokenizer = factory == null ? new WhitespaceTokenizer(Version.LUCENE_31, reader) : factory.create(reader);
TokenStream stream = ignoreCase ? new LowerCaseFilter(Version.LUCENE_31, tokenizer) : tokenizer;
return new TokenStreamComponents(tokenizer, stream);
}
};
String format = args.get("format");
try {
if (format == null || format.equals("solr")) {
// TODO: expose dedup as a parameter?
map = loadSolrSynonyms(loader, true, analyzer);
} else if (format.equals("wordnet")) {
map = loadWordnetSynonyms(loader, true, analyzer);
} else {
// TODO: somehow make this more pluggable
throw new IllegalArgumentException("Unrecognized synonyms format: " + format);
}
} catch (ParseException e) {
throw new IOException("Exception thrown while loading synonyms", e);
}
}
/**
* Load synonyms from the solr format, "format=solr".
*/
private SynonymMap loadSolrSynonyms(ResourceLoader loader, boolean dedup, Analyzer analyzer) throws IOException, ParseException {
final boolean expand = getBoolean("expand", true);
String synonyms = args.get("synonyms");
if (synonyms == null)
throw new IllegalArgumentException("Missing required argument 'synonyms'.");
CharsetDecoder decoder = Charset.forName("UTF-8").newDecoder()
.onMalformedInput(CodingErrorAction.REPORT)
.onUnmappableCharacter(CodingErrorAction.REPORT);
SolrSynonymParser parser = new SolrSynonymParser(dedup, expand, analyzer);
File synonymFile = new File(synonyms);
if (synonymFile.exists()) {
decoder.reset();
parser.add(new InputStreamReader(loader.openResource(synonyms), decoder));
} else {
List<String> files = splitFileNames(synonyms);
for (String file : files) {
decoder.reset();
parser.add(new InputStreamReader(loader.openResource(file), decoder));
}
}
return parser.build();
}
/**
* Load synonyms from the wordnet format, "format=wordnet".
*/
private SynonymMap loadWordnetSynonyms(ResourceLoader loader, boolean dedup, Analyzer analyzer) throws IOException, ParseException {
final boolean expand = getBoolean("expand", true);
String synonyms = args.get("synonyms");
if (synonyms == null)
throw new IllegalArgumentException("Missing required argument 'synonyms'.");
CharsetDecoder decoder = Charset.forName("UTF-8").newDecoder()
.onMalformedInput(CodingErrorAction.REPORT)
.onUnmappableCharacter(CodingErrorAction.REPORT);
WordnetSynonymParser parser = new WordnetSynonymParser(dedup, expand, analyzer);
File synonymFile = new File(synonyms);
if (synonymFile.exists()) {
decoder.reset();
parser.add(new InputStreamReader(loader.openResource(synonyms), decoder));
} else {
List<String> files = splitFileNames(synonyms);
for (String file : files) {
decoder.reset();
parser.add(new InputStreamReader(loader.openResource(file), decoder));
}
}
return parser.build();
}
private TokenizerFactory loadTokenizerFactory(ResourceLoader loader, String cname) throws IOException {
TokenizerFactory tokFactory = loader.newInstance(cname, TokenizerFactory.class);
tokFactory.setLuceneMatchVersion(luceneMatchVersion);
tokFactory.init(args);
if (tokFactory instanceof ResourceLoaderAware) {
((ResourceLoaderAware) tokFactory).inform(loader);
}
return tokFactory;
}
}