com.dec.persistent.Page.java Source code

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Here is the source code for com.dec.persistent.Page.java

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/**
 * Copyright &copy; 2012-2013 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.dec.persistent;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;

import com.dec.common.config.Global;

/**
 * ?
 * 
 * @author ThinkGem
 * @version 2013-7-2
 * @param <T>
 */
public class Page<T> {

    private int pageNo = 1; // ??
    private int pageSize = Integer.valueOf(Global.getConfig("page.pageSize")); // ???1??

    private long count;// ?1??

    private int first;// 
    private int last;// 
    private int prev;// ?
    private int next;// ?

    private boolean firstPage;// ??
    private boolean lastPage;// ???

    private int length = 8;// ?
    private int slider = 1;// ???

    private List<T> list = new ArrayList<T>();

    private String orderBy = ""; // ??updatedate desc, name asc

    private String funcName = "page"; // ?js??page??

    private String message = ""; // ???n???

    /**
     * ?
     * 
     * @param request
     *            ? repage ????
     * @param response
     *             Cookie??
     */
    public Page(HttpServletRequest request, HttpServletResponse response) {
        this(request, response, -2);
    }

    /**
     * ?
     * 
     * @param request
     *            ? repage ????
     * @param response
     *             Cookie??
     * @param pageSize
     *            ??-1 ???
     */
    public Page(HttpServletRequest request, HttpServletResponse response, int pageSize) {
        // ??repage?????
        String no = request.getParameter("pageNo");
        if (StringUtils.isNumeric(no)) {
            this.setPageNo(Integer.parseInt(no));
        } else if (request.getParameter("repage") != null) {
            if (StringUtils.isNumeric(no)) {
                this.setPageNo(Integer.parseInt(no));
            }
        }
        // ???repage??????
        String size = request.getParameter("pageSize");
        if (StringUtils.isNumeric(size)) {
            this.setPageSize(Integer.parseInt(size));
        } else if (request.getParameter("repage") != null) {
            if (StringUtils.isNumeric(size)) {
                this.setPageSize(Integer.parseInt(size));
            }
        }
        if (pageSize != -2) {
            this.pageSize = pageSize;
        }
        // ??
        String orderBy = request.getParameter("orderBy");
        if (StringUtils.isNotBlank(orderBy)) {
            this.setOrderBy(orderBy);
        }
    }

    public Page() {
        this(0, 0);
    }

    /**
     * ?
     * 
     * @param pageNo
     *            ??
     * @param pageSize
     *            ?
     */
    public Page(int pageNo, int pageSize) {
        this(pageNo, pageSize, 0);
    }

    /**
     * ?
     * 
     * @param pageNo
     *            ??
     * @param pageSize
     *            ?
     * @param count
     *            ??
     */
    public Page(int pageNo, int pageSize, long count) {
        this(pageNo, pageSize, count, new ArrayList<T>());
    }

    /**
     * ?
     * 
     * @param pageNo
     *            ??
     * @param pageSize
     *            ?
     * @param count
     *            ??
     * @param list
     *            ?
     */
    public Page(int pageNo, int pageSize, long count, List<T> list) {
        this.setCount(count);
        this.setPageNo(pageNo);
        this.pageSize = pageSize;
        this.setList(list);
    }

    /**
     * ???
     */
    public void initialize() {

        // 1
        this.first = 1;

        this.last = (int) (count / (this.pageSize < 1 ? 20 : this.pageSize) + first - 1);

        if (this.count % this.pageSize != 0 || this.last == 0) {
            this.last++;
        }

        if (this.last < this.first) {
            this.last = this.first;
        }

        if (this.pageNo <= 1) {
            this.pageNo = this.first;
            this.firstPage = true;
        }

        if (this.pageNo >= this.last) {
            this.pageNo = this.last;
            this.lastPage = true;
        }

        if (this.pageNo < this.last - 1) {
            this.next = this.pageNo + 1;
        } else {
            this.next = this.last;
        }

        if (this.pageNo > 1) {
            this.prev = this.pageNo - 1;
        } else {
            this.prev = this.first;
        }

        // 2
        if (this.pageNo < this.first) {// ???
            this.pageNo = this.first;
        }

        if (this.pageNo > this.last) {// ??
            this.pageNo = this.last;
        }

    }

    /**
     * ?
     * 
     * @return
     */
    public long getCount() {
        return count;
    }

    /**
     * ?
     * 
     * @param count
     */
    public void setCount(long count) {
        this.count = count;
        if (pageSize >= count) {
            pageNo = 1;
        }
    }

    /**
     * ???
     * 
     * @return
     */
    public int getPageNo() {
        return pageNo;
    }

    /**
     * ??
     * 
     * @param pageNo
     */
    public void setPageNo(int pageNo) {
        this.pageNo = pageNo;
    }

    /**
     * ???
     * 
     * @return
     */
    public int getPageSize() {
        return pageSize;
    }

    /**
     * ???00?
     * 
     * @param pageSize
     */
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize <= 0 ? 10 : pageSize > 500 ? 500 : pageSize;
    }

    /**
     * 
     * 
     * @return
     */
    public int getFirst() {
        return first;
    }

    /**
     * 
     * 
     * @return
     */
    public int getLast() {
        return last;
    }

    /**
     * ??
     * 
     * @return getLast();
     */
    public int getTotalPage() {
        return getLast();
    }

    /**
     * ??
     * 
     * @return
     */
    public boolean isFirstPage() {
        return firstPage;
    }

    /**
     * ???
     * 
     * @return
     */
    public boolean isLastPage() {
        return lastPage;
    }

    /**
     * ?
     * 
     * @return
     */
    public int getPrev() {
        if (isFirstPage()) {
            return pageNo;
        } else {
            return pageNo - 1;
        }
    }

    /**
     * ?
     * 
     * @return
     */
    public int getNext() {
        if (isLastPage()) {
            return pageNo;
        } else {
            return pageNo + 1;
        }
    }

    /**
     * ??
     * 
     * @return List<T>
     */
    public List<T> getList() {
        return list;
    }

    /**
     * ?
     * 
     * @param list
     */
    public void setList(List<T> list) {
        this.list = list;
    }

    /**
     * ???
     * 
     * @return
     */
    public String getOrderBy() {
        return orderBy;
    }

    /**
     * ? ?updatedate desc, name asc
     */
    public void setOrderBy(String orderBy) {
        this.orderBy = orderBy;
    }

    /**
     * ??js?? function ${page.funcName}(pageNo){location=
     * "${ctx}/list-${category.id}${urlSuffix}?pageNo="+i;}
     * 
     * @return
     */
    public String getFuncName() {
        return funcName;
    }

    /**
     * ?js??page??
     * 
     * @param funcName
     *            page
     */
    public void setFuncName(String funcName) {
        this.funcName = funcName;
    }

    /**
     * ???n???
     * 
     * @param message
     */
    public void setMessage(String message) {
        this.message = message;
    }

    /**
     * ?
     * 
     * @return this.pageSize==-1
     */
    public boolean isDisabled() {
        return this.pageSize == -1;
    }

    /**
     * ?
     * 
     * @return this.count==-1
     */
    public boolean isNotCount() {
        return this.count == -1;
    }

    /**
     * ? Hibernate FirstResult
     */
    public int getFirstResult() {
        int firstResult = (getPageNo() - 1) * getPageSize();
        if (firstResult >= getCount()) {
            firstResult = 0;
        }
        return firstResult;
    }

    /**
     * ? Hibernate MaxResults
     */
    public int getMaxResults() {
        return getPageSize();
    }

    public String toString() {
        return "Page [pageNo=" + pageNo + ", pageSize=" + pageSize + ", count=" + count + ", first=" + first
                + ", last=" + last + ", prev=" + prev + ", next=" + next + ", firstPage=" + firstPage
                + ", lastPage=" + lastPage + ", length=" + length + ", slider=" + slider + ", list=" + list
                + ", orderBy=" + orderBy + ", funcName=" + funcName + ", message=" + message + "]";
    }
}