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/* Copyright(c)2010-2013 WUDAOSOFT.COM
 * 
 * Email:[email protected]
 * 
 * QQ:275100589
 */
package com.wudaosoft.commons.utils;

import java.util.Date;

/**
 * 日期提供者,使用它而不是直接取得系统时间,方便测试。
 * 
 * @author Changsoul Wu
 */
public interface Clock {

	static final Clock DEFAULT = new DefaultClock();

	Date getCurrentDate();

	long getCurrentTimeInMillis();

	/**
	 * 默认时间提供者,返回当前的时间,线程安全。
	 */
	public static class DefaultClock implements Clock {

		@Override
		public Date getCurrentDate() {
			return new Date();
		}

		@Override
		public long getCurrentTimeInMillis() {
			return System.currentTimeMillis();
		}
	}

	/**
	 * 可配置的时间提供者,用于测试.
	 */
	public static class MockClock implements Clock {

		private long time;

		public MockClock() {
			this(0);
		}

		public MockClock(Date date) {
			this.time = date.getTime();
		}

		public MockClock(long time) {
			this.time = time;
		}

		@Override
		public Date getCurrentDate() {
			return new Date(time);
		}

		@Override
		public long getCurrentTimeInMillis() {
			return time;
		}

		/**
		 * 重新设置日期。
		 */
		public void update(Date newDate) {
			time = newDate.getTime();
		}

		/**
		 * 重新设置时间。
		 */
		public void update(long newTime) {
			this.time = newTime;
		}

		/**
		 * 滚动时间.
		 */
		public void increaseTime(int millis) {
			time += millis;
		}

		/**
		 * 滚动时间.
		 */
		public void decreaseTime(int millis) {
			time -= millis;
		}
	}

}




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