package cn.ksource.core.util;

import java.io.Serializable;
import java.util.List;

@SuppressWarnings("serial")
public class PageBeanUtil<T> implements Serializable
{
	     private List<T> list;        //要返回的某一页的记录列表
	     
	     private long allRow;         //总记录数
	     private int totalPage;        //总页数
	     private int currentPage;    //当前页
	     private int pageSize;        //每页记录数
	     private int stratPage;		//滚动条开始页码
	     private int endPage;		//滚动条结束页码
	     private final int pageList=10; //滚动条长度
	     
	     private boolean isFirstPage;    //是否为第一页
	     private boolean isLastPage;        //是否为最后一页
	     private boolean hasPreviousPage;    //是否有前一页
	     private boolean hasNextPage;        //是否有下一页
	     
	     
	      public List<T> getList() {
	         return list;
	     }
	      public void setList(List<T> list) {
	         this.list = list;
	     }
	      public long getAllRow() {
	         return allRow;
	     }
	      public void setAllRow(long allRow) {
	         this.allRow = allRow;
	     }
	      public int getTotalPage() {
	         return totalPage;
	     }
	      public void setTotalPage(int totalPage) {
	         this.totalPage = totalPage;
	     }
	      public int getCurrentPage() {
	         return currentPage;
	     }
	      public void setCurrentPage(int currentPage) {
	         this.currentPage = currentPage;
	     }
	      public int getPageSize() {
	         return pageSize;
	     }
	      public void setPageSize(int pageSize) {
	         this.pageSize = pageSize;
	     }
	     
	      /**
	      * 初始化分页信息
	      */
	      public void init(){
	         this.isFirstPage = isFirstPage();
	         this.isLastPage = isLastPage();
	         this.hasPreviousPage = isHasPreviousPage();
	         this.hasNextPage = isHasNextPage();
	     }
	     
	      /**
	      * 以下判断页的信息,只需getter方法(is方法)即可
	      * @return
	      */
	     
	      public boolean isFirstPage() {
	         return currentPage == 1;    // 如是当前页是第1页
	     }
	      public boolean isLastPage() {
	         return currentPage == totalPage;    //如果当前页是最后一页
	     }
	      public boolean isHasPreviousPage() {
	         return currentPage != 1;        //只要当前页不是第1页
	     }
	      public boolean isHasNextPage() {
	         return currentPage != totalPage;    //只要当前页不是最后1页
	     }
	     
	     
	      /**
	      * 计算总页数,静态方法,供外部直接通过类名调用
	      * @param pageSize 每页记录数
	      * @param allRow 总记录数
	      * @return 总页数
	      */
	      public static int countTotalPage(final int pageSize,final long allRow){
	         int totalPage = (int) (allRow % pageSize == 0 ? allRow/pageSize : allRow/pageSize+1);
	         return totalPage;
	     }
	     
	      /**
	      * 计算当前页开始记录
	      * @param pageSize 每页记录数
	      * @param currentPage 当前第几页
	      * @return 当前页开始记录号
	      */
	      public static int countOffset(final int pageSize,final int currentPage){
	         final int offset = pageSize*(currentPage-1);
	         return offset;
	     }
	     
	      /**
	      * 计算当前页,若为0或者请求的URL中没有"?page=",则用1代替
	      * @param page 传入的参数(可能为空,即0,则返回1)
	      * @return 当前页
	      */
	      public static int countCurrentPage(int page){
	         final int curPage = (page==0?1:page);         
	         return curPage;
	     }

		public int getStratPage() {

			if(this.currentPage>this.pageList/2){
				if((totalPage-currentPage)<5&&totalPage>10){
					return this.stratPage=totalPage-9;
				}
				return this.stratPage=this.currentPage-4;
			}
			else
			{
				return this.stratPage = 1;
			}
		}
		public int getEndPage() {
			if(this.totalPage<this.pageList){
				return this.endPage=this.totalPage;
			}
			else{
				if((totalPage-currentPage)<5){
					return this.endPage=totalPage;
				}
				return this.endPage = this.stratPage+9;	
			}
		}
}