package com.cucu.tapestry.util;

import java.io.Serializable;

/**
 * 一個查詢相關的分頁數(shù)據(jù)
 *
 * @author 絕情酷哥
 * @version 1.0
 */
public class PageUtil implements Serializable {
    /**
     * 當前第幾頁
     */
    int currentPageNum = 1;
    /**
     * 每頁多少條記錄
     */
    int perPageNum = 10; //默認每頁10條記錄
    /**
     * 總共有多少條記錄，總記錄數(shù)
     */
    int totalCount = 0;
    /**
     * 共有多少頁*
     */
    int pageCount = 1;

    /**
     * @return 得到當前頁碼
     */
    public int getCurrentPageNum() {
        if (this.currentPageNum > this.pageCount) {
            this.currentPageNum = this.pageCount;
        } else if (this.currentPageNum < 1) {
            this.currentPageNum = 1;
        }
        return currentPageNum;
    }

    /**
     * 設置當前頁碼
     *
     * @param currentPageNum
     */
    public void setCurrentPageNum(int currentPageNum) {
        if (this.currentPageNum > this.pageCount) {
            this.currentPageNum = this.pageCount;
        } else if (this.currentPageNum < 1) {
            this.currentPageNum = 1;
        }
        this.currentPageNum = currentPageNum;
    }

    /**
     * @return 得到總記錄數(shù)
     */
    public int getTotalCount() {
        return totalCount;
    }

    /**
     * 設置總記錄數(shù)
     *
     * @param totalCount
     */
    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
        this.doPageBreak();
    }

    /**
     * @return 得到每頁記錄數(shù)
     */
    public int getPerPageNum() {
        return perPageNum;
    }

    /**
     * 設置每頁記錄數(shù)
     *
     * @param perPageNum
     */
    public void setPerPageNum(int perPageNum) {
        this.perPageNum = perPageNum;
        doPageBreak();
    }

    /**
     * @return 返回總頁碼數(shù)
     */
    public int getPageCount() {
        return pageCount;
    }

    /**
     * 計算分頁的總頁數(shù)
     */
    public void doPageBreak() {
        if (this.perPageNum > 0 && this.totalCount > 0) {
            this.pageCount =
                    (int) Math.ceil(
                            ((double) this.totalCount) / ((double) this.perPageNum));
        }
    }
}