com.optimaize.langdetect.cybozu.GenProfile Maven / Gradle / Ivy
/*
* Copyright 2011 Nakatani Shuyo
*
* 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.
*/
package com.optimaize.langdetect.cybozu;
import com.optimaize.langdetect.cybozu.util.TagExtractor;
import com.optimaize.langdetect.cybozu.util.LangProfile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.*;
import java.util.zip.GZIPInputStream;
/**
* Load Wikipedia's abstract XML as corpus and generate its language profile in JSON format.
*
* @author Nakatani Shuyo
*/
public class GenProfile {
private static final Logger logger = LoggerFactory.getLogger(GenProfile.class);
/**
* Load Wikipedia abstract database file and generate its language profile
* @param lang target language name
* @param file target database file path
* @return Language profile instance
*/
public static LangProfile load(String lang, File file) {
LangProfile profile = new LangProfile(lang);
try (InputStream is = file.getName().endsWith(".gz") ?
new GZIPInputStream(new BufferedInputStream(new FileInputStream(file))) :
new BufferedInputStream(new FileInputStream(file))) {
TagExtractor tagextractor = new TagExtractor("abstract", 100);
XMLStreamReader reader = null;
try {
XMLInputFactory factory = XMLInputFactory.newInstance();
reader = factory.createXMLStreamReader(is);
while (reader.hasNext()) {
switch (reader.next()) {
case XMLStreamReader.START_ELEMENT:
tagextractor.setTag(reader.getName().toString());
break;
case XMLStreamReader.CHARACTERS:
tagextractor.add(reader.getText());
break;
case XMLStreamReader.END_ELEMENT:
tagextractor.closeTag(profile);
break;
}
}
} catch (XMLStreamException e) {
throw new RuntimeException("Training database file '" + file.getName() + "' is an invalid XML.", e);
} finally {
try {
if (reader != null) reader.close();
} catch (XMLStreamException e) { /* ignore exception */ }
}
logger.info(lang + ":" + tagextractor.count());
} catch (IOException e) {
throw new RuntimeException("Can't open training database file '" + file.getName() + "'", e);
}
return profile;
}
}