pagedata.java

一个成熟的论坛

package com.singnet.data;

import java.util.List;

public class PageData
{
	
	private int 			pageSize = 30; //per page size
	private List			items; //items
	private int				curPage = 0; //current page No.
	private int				prePage = 0; //previous page No.
	private int				nextPage = 0; //next page No.
	private int				totalCount = 0; //total items count
	private int				totalPages = 0; //total pages No.
	private int[]			pageIndex = new int[0]; //page indexs
	private int				startIndex = 0;
	
	public PageData()
	{
		
	}
	
	public PageData(List items, int totalCount)
	{
		setItems(items);
		setTotalCount(totalCount);
		setStartIndex(0);
	}
	
	public PageData(List items, int totalCount, int startIndex)
	{
		setItems(items);
		setTotalCount(totalCount);
		setStartIndex(startIndex);
	}
	
	public PageData(List items, int totalCount, int pageSize, int startIndex)
	{
		setPageSize(pageSize);
		setItems(items);
		setTotalCount(totalCount);
		setStartIndex(startIndex);
		
	}
	
	public void setTotalCount(int totalCount)
	{
		if(totalCount <= 0) {
			this.totalCount = 0;
		}
		else {
			this.totalCount = totalCount;
			int count = totalCount / pageSize;
			if(totalCount % pageSize > 0) count ++;
			this.totalPages = count;
			
			int pageIndexNum = count > 10 ? 10 : count;
			pageIndex = new int[pageIndexNum];
			for(int i = 1; i <= pageIndexNum; i++) {
				pageIndex[i - 1] = i;
			}
			
		}
	}
	
	public void setStartIndex(int startIndex)
	{
		if(totalCount <= 0) {
			this.curPage = 0;
			this.startIndex = 0;
		}
		else if(startIndex >= totalCount) {
			this.curPage = totalPages;
			this.startIndex = (totalPages - 1) * pageSize;
		}
		else if(startIndex < 0) {
			this.curPage = 0;
			this.startIndex = 0;
		}
		else {
			this.curPage = startIndex / pageSize + 1;
			this.startIndex += pageSize;
			
			if(totalPages > 10 && curPage <= totalPages) {
				if(curPage >= pageIndex[9]) {
					int maxPageNum = curPage + 1 >= totalPages ? totalPages : curPage + 1;
					for(int i = 9; i >= 0; i-- ) {
						pageIndex[i] = maxPageNum;
						maxPageNum--;
					}
				}				
			}
		
		}
	}
	
	public int getCurPage()
	{
		return curPage;
	}
	public void setCurPage(int curPage)
	{
		this.curPage = curPage;
	}
	public List getItems()
	{
		return items;
	}
	public void setItems(List items)
	{
		this.items = items;
	}
	public int getNextPage()
	{
		return curPage + 1 > totalPages ? totalPages : curPage + 1;
	}
	public void setNextPage(int nextPage)
	{
		this.nextPage = nextPage;
	}
	public int[] getPageIndex()
	{
		return pageIndex;
	}
	public void setPageIndex(int[] pageIndex)
	{
		this.pageIndex = pageIndex;
	}
	public int getPageSize()
	{
		return pageSize;
	}
	public void setPageSize(int pageSize)
	{
		this.pageSize = pageSize;
	}
	public int getPrePage()
	{
		return curPage - 1 <= 1 ? 1 : curPage - 1;
	}
	public void setPrePage(int prePage)
	{
		this.prePage = prePage;
	}
	public int getStartIndex()
	{
		return startIndex;
	}
	
	public int getTotalCount()
	{
		return totalCount;
	}
	
	public int getTotalPages()
	{
		return totalPages;
	}
	public void setTotalPages(int totalPages)
	{
		this.totalPages = totalPages;
	}

}