ByteOrderMark - Handling a byte order mark in Java

// Blog post:
// http://www.shirmanov.com/2010/08/byteordermark-handling-byte-order-mark.html
package com.blueoceansystems.samples;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import com.google.common.base.Charsets;

// Usage:

// InputStream in;
// Reader reader;
// try {
//	  reader = ByteOrderMark.handleFrom( in ).getInputStreamReader();
// } catch( IOException ex ) {
// 	  // Empty
// }

public final class ByteOrderMark {

	private InputStream _inputStream;
	
	private ByteOrderMark( InputStream inputStream ) {
		this._inputStream = inputStream;
	}

	public static ByteOrderMark handleFrom( InputStream inputStream ) {
		return new ByteOrderMark( inputStream );
	}
	
	public Reader getInputStreamReader() throws IOException {
		_inputStream.mark( 3 );
		
	    int byte1 = _inputStream.read();
	    int byte2 = _inputStream.read();
	    
	    if( byte1 == 0xFF && byte2 == 0xFE ) {
	    	return new InputStreamReader( _inputStream, Charsets.UTF_16LE );
	    } else if( byte1 == 0xFF && byte2 == 0xFF ) {
	    	return new InputStreamReader( _inputStream, Charsets.UTF_16BE );
	    } else {
	    	int byte3 = _inputStream.read();
	    	if (byte1 == 0xEF && byte2 == 0xBB && byte3 == 0xBF) {
	    		return new InputStreamReader( _inputStream, Charsets.UTF_8 );
	    	} else {
	    		_inputStream.reset();
	    		return new InputStreamReader( _inputStream );
	    	}
	    }
	}
}