package web.breakpage;

public class Page
{
	private int totalRows; //總行數

	private int pageSize; //每頁顯示的行數

	private int currentPage; //當前頁號

	private int totalPages; //總頁數

	private int startRow; //當前頁在數據庫中的起始行

	public Page(int _totalRows,int _pageSize)
	{
		totalRows = _totalRows;
		totalPages = totalRows / _pageSize;
		int mod = totalRows % _pageSize;
		if (mod > 0)
		{
			totalPages++;
		}
		pageSize = _pageSize;
		currentPage = 1;
		startRow = 0;
	}

	public int getStartRow()
	{
		return startRow;
	}

	public int getTotalPages()
	{
		return totalPages;
	}

	public int getCurrentPage()
	{
		return currentPage;
	}

	public int getPageSize()
	{
		return pageSize;
	}

	public void setTotalRows(int totalRows)
	{
		this.totalRows = totalRows;
	}

	public void setStartRow(int startRow)
	{
		this.startRow = startRow;
	}

	public void setTotalPages(int totalPages)
	{
		this.totalPages = totalPages;
	}

	public void setCurrentPage(int currentPage)
	{
		this.currentPage = currentPage;
	}

	public void setPageSize(int pageSize)
	{
		this.pageSize = pageSize;
	}

	public int getTotalRows()
	{
		return totalRows;
	}

	public void first()
	{
		currentPage = 1;
		startRow = 0;
	}

	public void previous()
	{
		if (currentPage == 1)
		{
			return;
		}
		currentPage--;
		startRow = (currentPage - 1) * pageSize;
	}

	public void next()
	{
		if (currentPage < totalPages)
		{
			currentPage++;
		}
		startRow = (currentPage - 1) * pageSize;
	}

	public void last()
	{
		currentPage = totalPages;
		startRow = (currentPage - 1) * pageSize;
	}
	
	public void select(int _currentPage)
	{
		currentPage = _currentPage;
		startRow = (currentPage-1) * pageSize;
	}
	public void refresh(int _currentPage)
	{
		currentPage = _currentPage;
		if (currentPage > totalPages)
		{
			last();
		}
	}
}