package jp.sourceforge.akjrcp.commons.util;

/*

 * 

 * Copyright [akjava.com] [name of copyright owner]

   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.

 * 

 */

import java.io.File;

import java.io.IOException;

import org.apache.commons.io.FileUtils;

import org.mozilla.universalchardet.UniversalDetector;

public class DetectUtils {

public static final String ENCODING_MS932="MS932";

public static final String defaultEncoding="MS932";

public static String lastEncoding;

public static String getEncoding(File file){

try{

java.io.FileInputStream fis = new java.io.FileInputStream(file);

byte[] buf = new byte[4096];

   UniversalDetector detector = new UniversalDetector(null);

   int nread;

   while ((nread = fis.read(buf)) > 0 && !detector.isDone()) {

     detector.handleData(buf, 0, nread);

   }

   detector.dataEnd();

   return  detector.getDetectedCharset();

}catch(Exception e){

e.printStackTrace();

}

return null;

}

public static String readFileToString(File file) throws IOException{

String encode=getEncoding(file);

if(encode==null){

encode=defaultEncoding;

}

String text=FileUtils.readFileToString(file, encode);

if(text.charAt(0) == 65279){//UTF-8 marker

text=text.substring(1);

}

return text;

}

}