package cn.com.qmth.examcloud.commons.helpers;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

/**
 * 黑洞(PrintStream)构建器
 *
 * @author WANGWEI
 * @date 2019年3月28日
 * @Copyright (c) 2018-? http://qmth.com.cn All Rights Reserved.
 */
public class BlackHolePrintStreamBuilder {

	/**
	 * 创建BlackHolePrintStream
	 *
	 * @author WANGWEI
	 * @return
	 */
	public static PrintStream build() {
		return new BlackHolePrintStream(new ByteArrayOutputStream());
	}

	/**
	 * 黑洞(PrintStream)
	 *
	 * @author WANGWEI
	 * @date 2019年3月28日
	 * @Copyright (c) 2018-? http://qmth.com.cn All Rights Reserved.
	 */
	private static class BlackHolePrintStream extends PrintStream {

		@Override
		public void close() {
			super.close();
		}

		ByteArrayOutputStream outputStream;

		/**
		 * 私有构造函数
		 *
		 * @param out
		 */
		private BlackHolePrintStream(ByteArrayOutputStream outputStream) {
			super(outputStream);
			this.outputStream = outputStream;
		}

		@Override
		public void println(String x) {
			outputStream.reset();
		}

		@Override
		public void print(String x) {
			outputStream.reset();
		}

	}

}