/*
* 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 be.frma.langguess;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.zip.GZIPInputStream;
import com.cybozu.labs.langdetect.ErrorCode;
import com.cybozu.labs.langdetect.LangDetectException;
import com.cybozu.labs.langdetect.util.LangProfile;
import com.cybozu.labs.langdetect.util.NGram;
/**
* Generate a language profile from any given text file.
*
* @author François ROLAND
*
*/
public class GenProfile {
/**
* Loads a text file and generate a language profile from its content. The input text file is supposed to be encoded in UTF-8.
* @param lang target language name.
* @param textFile input text file.
* @return Language profile instance
* @throws LangDetectException
*/
public static LangProfile generate(String lang, File textFile) throws LangDetectException {
LangProfile profile = new LangProfile(lang);
InputStream is = null;
try {
is = new BufferedInputStream(new FileInputStream(textFile));
if (textFile.getName().endsWith(".gz")) is = new GZIPInputStream(is);
BufferedReader reader = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String line;
while ((line = reader.readLine()) != null) {
NGram ngram = new NGram();
for (char c : line.toCharArray()) {
ngram.addChar((char) c);
for (int i = 1; i <= NGram.N_GRAM; i++) {
profile.add(ngram.get(i));
}
}
}
} catch (IOException e) {
throw new LangDetectException(ErrorCode.CantOpenTrainData, "Can't open training database file '" + textFile.getName() + "'");
} finally {
IOUtils.closeQuietly(is);
}
return profile;
}
}