package com.wlpava.utils;

import java.util.*;


/**
 * 實現通過調用IQuery實現分頁處理
 * @author 蔡世友
 */
public class PageList implements IPageList {
	private int rowCount;// 記錄數
	private int pages;// 總頁數
	private int currentPage;// 實際頁數
	private List result;
	private IQuery query;
	
	public PageList() {

	}

	public PageList(IQuery q) {
		this.query = q;
	}

	public void setQuery(IQuery q) {
		query = q;
	}

	public List getResult() {
		return result;
	}

	public void doList(int pageSize, int pageNo, String totalSQL, String queryHQL) {
		List rs = null;
		int total = query.getRows(totalSQL);
		if (total > 0) {
			this.rowCount = total;
			this.pages = (this.rowCount + pageSize - 1) / pageSize; // 記算總頁數
			int intPageNo = (pageNo > this.pages ? this.pages : pageNo);
			if (intPageNo < 1)
				intPageNo = 1;
			this.currentPage = intPageNo;
			if (pageSize > 0) {
				query.setFirstResult((intPageNo - 1) * pageSize);
				query.setMaxResults(pageSize);
			}
			rs = query.getResult(queryHQL);
		}
		result = rs;
	}

	public void doList(int pageSize, int pageNo, String totalSQL, String queryHQL, Collection paraValues) {
		List rs = null;
		query.setParaValues(paraValues);
		int total = query.getRows(totalSQL);
		if (total > 0) {
			this.rowCount = total;
			this.pages = (this.rowCount + pageSize - 1) / pageSize; // 記算總頁數
			int intPageNo = (pageNo > this.pages ? this.pages : pageNo);
			if (intPageNo < 1)
				intPageNo = 1;
			this.currentPage = intPageNo;
			if (pageSize > 0) {
				query.setFirstResult((intPageNo - 1) * pageSize);
				query.setMaxResults(pageSize);
			}
			rs = query.getResult(queryHQL);
		}
		result = rs;
	}

	public int getPages() {
		return pages;
	}

	public int getRowCount() {
		return rowCount;
	}

	public int getCurrentPage() {
		return currentPage;
	}

}