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package org.macrocloud.kernel.toolkit.utils;

import org.springframework.lang.Nullable;

import java.io.*;
import java.nio.charset.Charset;


/**
 * 流工具类.
 *
 * @author macro
 */
public class IoUtil extends org.springframework.util.StreamUtils {

	/**
	 * closeQuietly.
	 *
	 * @param closeable 自动关闭
	 */
	public static void closeQuietly(@Nullable Closeable closeable) {
		if (closeable == null) {
			return;
		}
		if (closeable instanceof Flushable) {
			try {
				((Flushable) closeable).flush();
			} catch (IOException ignored) {
				// ignore
			}
		}
		try {
			closeable.close();
		} catch (IOException ignored) {
			// ignore
		}
	}

	/**
	 * InputStream to String utf-8.
	 *
	 * @param input the InputStream to read from
	 * @return the requested String
	 */
	public static String readToString(InputStream input) {
		return readToString(input, Charsets.UTF_8);
	}

	/**
	 * InputStream to String.
	 *
	 * @param input   the InputStream to read from
	 * @param charset the Charset
	 * @return the requested String
	 */
	public static String readToString(@Nullable InputStream input, Charset charset) {
		try {
			return IoUtil.copyToString(input, charset);
		} catch (IOException e) {
			throw Exceptions.unchecked(e);
		} finally {
			IoUtil.closeQuietly(input);
		}
	}

	/**
	 * Read to byte array.
	 *
	 * @param input the input
	 * @return the byte[]
	 */
	public static byte[] readToByteArray(@Nullable InputStream input) {
		try {
			return IoUtil.copyToByteArray(input);
		} catch (IOException e) {
			throw Exceptions.unchecked(e);
		} finally {
			IoUtil.closeQuietly(input);
		}
	}

	/**
	 * Writes chars from a String to bytes on an
	 * OutputStream using the specified character encoding.
	 * 
	 * This method uses {@link String#getBytes(String)}.
	 * 
	 *
	 * @param data     the String to write, null ignored
	 * @param output   the OutputStream to write to
	 * @param encoding the encoding to use, null means platform default
	 * @throws IOException          if an I/O error occurs
	 * @throws NullPointerException if output is null
	 */
	public static void write(@Nullable final String data, final OutputStream output, final Charset encoding) throws IOException {
		if (data != null) {
			output.write(data.getBytes(encoding));
		}
	}
}