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241
src/main/java/com/nlf/calendar/SolarWeek.java
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241
src/main/java/com/nlf/calendar/SolarWeek.java
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package com.nlf.calendar;
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import com.nlf.calendar.util.SolarUtil;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.List;
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/**
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* 阳历周
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*/
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public class SolarWeek {
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/** 年 */
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private int year;
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/** 月 */
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private int month;
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/** 日 */
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private int day;
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/** 星期几作为一周的开始，1234560分别代表星期一至星期天 */
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private int start;
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/**
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* 默认当月
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* @param start 星期几作为一周的开始，1234560分别代表星期一至星期天
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*/
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public SolarWeek(int start){
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this(new Date(),start);
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}
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/**
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* 通过日期初始化
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* @param start 星期几作为一周的开始，1234560分别代表星期一至星期天
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*/
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public SolarWeek(Date date,int start){
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Calendar c = Calendar.getInstance();
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c.setTime(date);
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year = c.get(Calendar.YEAR);
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month = c.get(Calendar.MONTH)+1;
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day = c.get(Calendar.DATE);
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this.start = start;
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}
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/**
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* 通过日历初始化
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* @param start 星期几作为一周的开始，1234560分别代表星期一至星期天
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*/
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public SolarWeek(Calendar calendar,int start){
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year = calendar.get(Calendar.YEAR);
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month = calendar.get(Calendar.MONTH)+1;
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day = calendar.get(Calendar.DATE);
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this.start = start;
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}
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/**
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* 通过年月初始化
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*
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* @param year 年
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* @param month 月，1到12
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* @param day 日，1到31
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* @param start 星期几作为一周的开始，1234560分别代表星期一至星期天
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*/
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public SolarWeek(int year, int month ,int day,int start){
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this.year = year;
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this.month = month;
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this.day = day;
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this.start = start;
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}
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/**
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* 获取年
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*
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* @return 年
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*/
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public int getYear(){
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return year;
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}
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/**
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* 获取月
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*
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* @return 1到12
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*/
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public int getMonth(){
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return month;
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}
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/**
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* 获取日期
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*
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* @return 1到31之间的数字
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*/
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public int getDay(){
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return day;
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}
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/**
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* 获取星期几作为一周的开始，1234560分别代表星期一至星期天
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*
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* @return 1234560分别代表星期一至星期天
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*/
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public int getStart(){
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return start;
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}
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/**
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* 获取当前日期是在当月第几周
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* @return 周序号，从1开始
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*/
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public int getIndex(){
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Calendar c = Calendar.getInstance();
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c.set(year,month-1,1);
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int firstDayWeek = c.get(Calendar.DAY_OF_WEEK)-1;
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return (int)Math.ceil((day+firstDayWeek-start)/7D);
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}
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/**
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* 周推移
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* @param weeks 推移的周数，负数为倒推
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* @param separateMonth 是否按月单独计算
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* @return 推移后的阳历周
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*/
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public SolarWeek next(int weeks,boolean separateMonth){
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if(0==weeks){
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return new SolarWeek(year,month,day,start);
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}
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if(separateMonth){
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int n = weeks;
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Calendar c = Calendar.getInstance();
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c.set(year,month-1,day);
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SolarWeek week = new SolarWeek(c,start);
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int month = this.month;
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boolean plus = n>0;
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while(0!=n){
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c.add(Calendar.DATE,plus?7:-7);
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week = new SolarWeek(c,start);
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int weekMonth = week.getMonth();
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if(month!=weekMonth){
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int index = week.getIndex();
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if(plus){
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if(1==index){
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Solar firstDay = week.getFirstDay();
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week = new SolarWeek(firstDay.getYear(),firstDay.getMonth(),firstDay.getDay(),start);
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weekMonth = week.getMonth();
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}else{
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c.set(week.getYear(),week.getMonth()-1,1);
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week = new SolarWeek(c,start);
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}
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}else{
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int size = SolarUtil.getWeeksOfMonth(week.getYear(),week.getMonth(),start);
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if(size==index){
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Solar firstDay = week.getFirstDay();
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Solar lastDay = firstDay.next(6);
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week = new SolarWeek(lastDay.getYear(),lastDay.getMonth(),lastDay.getDay(),start);
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weekMonth = week.getMonth();
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}else{
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c.set(week.getYear(),week.getMonth()-1,SolarUtil.getDaysOfMonth(week.getYear(),week.getMonth()));
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week = new SolarWeek(c,start);
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}
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}
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month = weekMonth;
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}
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n-=plus?1:-1;
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}
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return week;
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}else{
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Calendar c = Calendar.getInstance();
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c.set(year,month-1,day);
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c.add(Calendar.DATE,weeks*7);
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return new SolarWeek(c,start);
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}
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}
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/**
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* 获取本周第一天的阳历日期（可能跨月）
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* @return 本周第一天的阳历日期
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*/
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public Solar getFirstDay(){
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Calendar c = Calendar.getInstance();
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c.set(year,month-1,day);
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int week = c.get(Calendar.DAY_OF_WEEK)-1;
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int prev = week - start;
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if(prev<0){
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prev += 7;
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}
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c.add(Calendar.DATE,-prev);
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return new Solar(c);
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}
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/**
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* 获取本周第一天的阳历日期（仅限当月）
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* @return 本周第一天的阳历日期
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*/
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public Solar getFirstDayInMonth(){
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List<Solar> days = getDays();
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for(Solar day:days){
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if(month==day.getMonth()){
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return day;
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}
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}
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return null;
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}
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/**
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* 获取本周的阳历日期列表（可能跨月）
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* @return 本周的阳历日期列表
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*/
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public List<Solar> getDays(){
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Solar firstDay = getFirstDay();
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List<Solar> l = new ArrayList<Solar>();
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l.add(firstDay);
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for(int i = 1;i<7;i++){
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l.add(firstDay.next(i));
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}
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return l;
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}
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/**
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* 获取本周的阳历日期列表（仅限当月）
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* @return 本周的阳历日期列表（仅限当月）
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*/
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public List<Solar> getDaysInMonth(){
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List<Solar> days = this.getDays();
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List<Solar> l = new ArrayList<Solar>();
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for(Solar day:days){
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if(month!=day.getMonth()){
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continue;
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}
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l.add(day);
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}
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return l;
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}
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public String toString(){
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return year+"."+month+"."+getIndex();
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}
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public String toFullString(){
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return year+"年"+month+"月第"+getIndex()+"周";
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}
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}
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