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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.aliyun.mns.common.utils;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;

public class IOUtils {

    public static String readStreamAsString(InputStream in, String charset)
        throws IOException {
        if (in == null) {
            return "";
        }

        Reader reader = null;
        Writer writer = new StringWriter();
        String result;

        char[] buffer = new char[1024];
        try {
            reader = new BufferedReader(
                new InputStreamReader(in, charset));

            int n;
            while ((n = reader.read(buffer)) > 0) {
                writer.write(buffer, 0, n);
            }

            result = writer.toString();
        } finally {
            in.close();
            if (reader != null) {
                reader.close();
            }
            if (writer != null) {
                writer.close();
            }
        }

        return result;
    }

    public static byte[] readStreamAsBytesArray(InputStream in)
        throws IOException {
        if (in == null) {
            return new byte[0];
        }

        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        while ((len = in.read(buffer)) > -1) {
            output.write(buffer, 0, len);
        }
        output.flush();
        return output.toByteArray();
    }

    public static void safeClose(InputStream inputStream) {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {
            }
        }
    }

    public static void safeClose(OutputStream outputStream) {
        if (outputStream != null) {
            try {
                outputStream.close();
            } catch (IOException e) {
            }
        }
    }
}