package org.apache.solr.update.processor;
/*
* 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.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import com.cybozu.labs.langdetect.Detector;
import com.cybozu.labs.langdetect.DetectorFactory;
import com.cybozu.labs.langdetect.LangDetectException;
import com.cybozu.labs.langdetect.Language;
/**
* Identifies the language of a set of input fields using http://code.google.com/p/language-detection
* <p>
* See <a href="http://wiki.apache.org/solr/LanguageDetection">http://wiki.apache.org/solr/LanguageDetection</a>
* @since 3.5
*/
public class LangDetectLanguageIdentifierUpdateProcessor extends LanguageIdentifierUpdateProcessor {
public LangDetectLanguageIdentifierUpdateProcessor(SolrQueryRequest req,
SolrQueryResponse rsp, UpdateRequestProcessor next) {
super(req, rsp, next);
}
@Override
protected List<DetectedLanguage> detectLanguage(String content) {
if (content.trim().length() == 0) { // to be consistent with the tika impl?
log.debug("No input text to detect language from, returning empty list");
return Collections.emptyList();
}
try {
Detector detector = DetectorFactory.create();
detector.append(content);
ArrayList<Language> langlist = detector.getProbabilities();
ArrayList<DetectedLanguage> solrLangList = new ArrayList<>();
for (Language l: langlist) {
solrLangList.add(new DetectedLanguage(l.lang, l.prob));
}
return solrLangList;
} catch (LangDetectException e) {
log.debug("Could not determine language, returning empty list: ", e);
return Collections.emptyList();
}
}
}