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/**
 * Project: ocean.client.java.basic
 * 
 * File Created at 2011-11-23
 * $Id: DateUtil.java 311300 2013-12-23 06:15:28Z yichun.wangyc $
 * 
 * Copyright 2008 Alibaba.com Croporation Limited.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * Alibaba Company. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Alibaba.com.
 */
package com.alibaba.ocean.rawsdk.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

/**
 * 
 * @author hongbang.hb
 *
 */
public final class DateUtil {
	// 这个格式一般用来处理从Ocean返回的日期格式。原因是从Ocean端返回的日期格式，通常是"yyyyMMddHHmmssSSSZ"
	public static final String DEFAULT_DATE_FORMAT_STR = "yyyyMMddHHmmssSSSZ";

	// 有时，后端应用程序会使用fastJson,
	// 但fastJson不支持"yyyyMMddHHmmssSSSZ"这种日期格式，所以在这里增加了"yyyy-MM-dd HH:mm:ss.SSS".而这种格式却没有时区
	public static final String SIMPLE_DATE_FORMAT_STR = "yyyy-MM-dd HH:mm:ss.SSS";

	private static SimpleDateFormat DEFAULT_FORMAT = new SimpleDateFormat(DEFAULT_DATE_FORMAT_STR);

	public static String format(Date d) {
		return format(d, null);
	}

	public static String format(Date d, String pattern) {
		return format(d, pattern, null);
	}

	public static String format(Date d, String pattern, TimeZone timeZone) {
		if (d == null) {
			return null;
		}
		final SimpleDateFormat format;
		if (pattern != null) {
			format = new SimpleDateFormat(pattern);
		} else {
			format = (SimpleDateFormat) DEFAULT_FORMAT.clone();
		}
		if (timeZone != null) {
			format.setTimeZone(timeZone);
		}
		return format.format(d);
	}

	public static Date parse(String str) throws ParseException {
		return parse(str, null);
	}

	public static Date parse(String source, String pattern) throws ParseException {
		return parse(source, pattern, null);
	}

	public static Date parse(String source, String pattern, TimeZone timeZone) throws ParseException {
		if (source == null) {
			return null;
		}
		final SimpleDateFormat format;
		if (pattern != null) {
			format = new SimpleDateFormat(pattern);
		} else {
			format = (SimpleDateFormat) DEFAULT_FORMAT.clone();
		}
		if (timeZone != null) {
			format.setTimeZone(timeZone);
		}
		return format.parse(source);
	}

	private DateUtil() {
	};
}