/*
 * Copyright Notice:
 *      Copyright  1998-2008, Huawei Technologies Co., Ltd.  ALL Rights Reserved.
 *
 *      Warning: This computer software sourcecode is protected by copyright law
 *      and international treaties. Unauthorized reproduction or distribution
 *      of this sourcecode, or any portion of it, may result in severe civil and
 *      criminal penalties, and will be prosecuted to the maximum extent
 *      possible under the law.
 */
package com.casic.missiles.util;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;


public class StreamUtil {


    private static final String DEFAULT_ENCODING = "utf-8";

    public static String inputStream2String(InputStream in, String charsetName) {
        if (in == null) {
            return null;
        }

        InputStreamReader inReader = null;

        try {
            if (null == charsetName || charsetName.equalsIgnoreCase("") == true) {
                inReader = new InputStreamReader(in, DEFAULT_ENCODING);
            } else {
                inReader = new InputStreamReader(in, charsetName);
            }

            int readLen = 0;
            char[] buffer = new char[1024];
            StringBuffer strBuf = new StringBuffer();
            while ((readLen = inReader.read(buffer)) != -1) {
                strBuf.append(buffer, 0, readLen);
            }

            return strBuf.toString();
        } catch (IOException e) {
            System.out.println(e);
        } finally {
            closeStream(inReader);
        }

        return null;
    }

    public static void closeStream(Closeable closeable) {
        if (closeable != null) {
            try {
                closeable.close();
            } catch (IOException e) {
                System.out.println(e);
            }
        }
    }
}