394 lines
9.5 KiB
Java
394 lines
9.5 KiB
Java
package com.cim.idm.utils;
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import java.io.Serializable;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.List;
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/**
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* 分页数据返回统一类型
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* Author:zhangp
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* Date:2023/09/19
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*/
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public class PageResult<T> implements Serializable{
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private static final long serialVersionUID = 1L;
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public static final int DEFAULT_NAVIGATE_PAGES = 8;
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public static final PageResult EMPTY = new PageResult(Collections.emptyList(), 0, 0, 0);
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/**
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* 总记录数
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*/
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protected long total;
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/**
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* 结果集
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*/
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protected List<T> list;
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/**
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* 当前页的页码
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*/
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private int pageNum;
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/**
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* 每页的数量
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*/
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private int pageSize;
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/**
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* 当前页的数量
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*/
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private int size;
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/**
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* 当前页面第一个元素在数据库中的行号
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* 可以在页面中显示startRow到endRow 共size条数据
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*/
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private long startRow;
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/**
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* 当前页面最后一个元素在数据库中的行号
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*/
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private long endRow;
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/**
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* 总页数
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*/
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private int pages;
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/**
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* prePage
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*/
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private int prePage;
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/**
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* 下一页
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*/
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private int nextPage;
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/**
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* 是否为第一页
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*/
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private boolean isFirstPage = false;
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/**
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* 是否为最后一页
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*/
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private boolean isLastPage = false;
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/**
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* 是否有前一页
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*/
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private boolean hasPreviousPage = false;
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/**
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* 是否有下一页
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*/
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private boolean hasNextPage = false;
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/**
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* 导航页码数
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*/
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private int navigatePages;
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/**
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* 所有导航页号
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*/
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private int[] navigatepageNums;
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/**
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* 导航条上的第一页
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*/
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private int navigateFirstPage;
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/**
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* 导航条上的最后一页
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*/
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private int navigateLastPage;
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public PageResult() {
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}
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/**
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* 包装Page对象
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*
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* @param list
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*/
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public PageResult(List<T> list) {
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this(list, DEFAULT_NAVIGATE_PAGES, DEFAULT_NAVIGATE_PAGES, DEFAULT_NAVIGATE_PAGES);
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}
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/**
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* 包装Page对象
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*
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* @param list page结果
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* @param navigatePages 页码数量
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*/
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public PageResult(List<T> list, int navigatePages , int sum, int pageNumber) {
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this.list = list;
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this.total = (long)sum;
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if (list instanceof Collection) {
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// this.pageNum = 1;
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this.pageNum = pageNumber;
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this.pageSize = list.size();
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// this.pages = this.pageSize > 0 ? 1 : 0;
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this.pages = navigatePages;
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this.size = list.size();
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this.startRow = 0;
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this.endRow = list.size() > 0 ? list.size() - 1 : 0;
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}
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if (list instanceof Collection) {
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calcByNavigatePages(navigatePages);
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}
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}
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public static <T> PageResult<T> of(List<T> list) {
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return new PageResult<T>(list);
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}
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public static <T> PageResult<T> of(List<T> list, int navigatePages) {
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return new PageResult<T>(list, navigatePages, navigatePages, navigatePages);
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}
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public static <T> PageResult<T> emptyPageInfo() {
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return EMPTY;
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}
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public void calcByNavigatePages(int navigatePages) {
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setNavigatePages(navigatePages);
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//计算导航页
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calcNavigatepageNums();
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//计算前后页，第一页，最后一页
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calcPage();
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//判断页面边界
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judgePageBoudary();
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}
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/**
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* 计算导航页
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*/
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private void calcNavigatepageNums() {
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if (pages <= navigatePages) {
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navigatepageNums = new int[pages];
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for (int i = 0; i < pages; i++) {
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navigatepageNums[i] = i + 1;
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}
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} else {
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navigatepageNums = new int[navigatePages];
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int startNum = pageNum - navigatePages / 2;
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int endNum = pageNum + navigatePages / 2;
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if (startNum < 1) {
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startNum = 1;
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for (int i = 0; i < navigatePages; i++) {
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navigatepageNums[i] = startNum++;
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}
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} else if (endNum > pages) {
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endNum = pages;
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for (int i = navigatePages - 1; i >= 0; i--) {
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navigatepageNums[i] = endNum--;
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}
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} else {
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for (int i = 0; i < navigatePages; i++) {
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navigatepageNums[i] = startNum++;
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}
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}
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}
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}
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/**
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* 计算前后页，第一页，最后一页
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*/
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private void calcPage() {
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if (navigatepageNums != null && navigatepageNums.length > 0) {
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navigateFirstPage = navigatepageNums[0];
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navigateLastPage = navigatepageNums[navigatepageNums.length - 1];
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if (pageNum > 1) {
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prePage = pageNum - 1;
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}
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if (pageNum < pages) {
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nextPage = pageNum + 1;
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}
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}
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}
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/**
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* 判断页面边界
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*/
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private void judgePageBoudary() {
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isFirstPage = pageNum == 1;
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isLastPage = pageNum == pages || pages == 0;
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hasPreviousPage = pageNum > 1;
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hasNextPage = pageNum < pages;
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}
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public boolean hasContent() {
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return this.size > 0;
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}
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public long getTotal() {
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return this.total;
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}
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public void setTotal(long total) {
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this.total = total;
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}
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public List<T> getList() {
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return this.list;
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}
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public void setList(List<T> list) {
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this.list = list;
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}
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public int getPageNum() {
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return pageNum;
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}
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public void setPageNum(int pageNum) {
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this.pageNum = pageNum;
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}
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public int getPageSize() {
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return pageSize;
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}
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public void setPageSize(int pageSize) {
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this.pageSize = pageSize;
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}
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public int getSize() {
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return size;
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}
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public void setSize(int size) {
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this.size = size;
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}
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public long getStartRow() {
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return startRow;
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}
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public void setStartRow(long startRow) {
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this.startRow = startRow;
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}
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public long getEndRow() {
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return endRow;
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}
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public void setEndRow(long endRow) {
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this.endRow = endRow;
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}
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public int getPages() {
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return pages;
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}
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public void setPages(int pages) {
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this.pages = pages;
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}
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public int getPrePage() {
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return prePage;
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}
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public void setPrePage(int prePage) {
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this.prePage = prePage;
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}
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public int getNextPage() {
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return nextPage;
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}
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public void setNextPage(int nextPage) {
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this.nextPage = nextPage;
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}
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public boolean isIsFirstPage() {
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return isFirstPage;
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}
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public void setIsFirstPage(boolean isFirstPage) {
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this.isFirstPage = isFirstPage;
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}
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public boolean isIsLastPage() {
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return isLastPage;
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}
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public void setIsLastPage(boolean isLastPage) {
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this.isLastPage = isLastPage;
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}
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public boolean isHasPreviousPage() {
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return hasPreviousPage;
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}
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public void setHasPreviousPage(boolean hasPreviousPage) {
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this.hasPreviousPage = hasPreviousPage;
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}
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public boolean isHasNextPage() {
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return hasNextPage;
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}
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public void setHasNextPage(boolean hasNextPage) {
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this.hasNextPage = hasNextPage;
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}
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public int getNavigatePages() {
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return navigatePages;
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}
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public void setNavigatePages(int navigatePages) {
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this.navigatePages = navigatePages;
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}
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public int[] getNavigatepageNums() {
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return navigatepageNums;
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}
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public void setNavigatepageNums(int[] navigatepageNums) {
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this.navigatepageNums = navigatepageNums;
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}
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public int getNavigateFirstPage() {
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return navigateFirstPage;
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}
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public int getNavigateLastPage() {
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return navigateLastPage;
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}
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public void setNavigateFirstPage(int navigateFirstPage) {
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this.navigateFirstPage = navigateFirstPage;
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}
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public void setNavigateLastPage(int navigateLastPage) {
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this.navigateLastPage = navigateLastPage;
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}
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@Override
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public String toString() {
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final StringBuilder sb = new StringBuilder("PageInfo{");
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sb.append("pageNum=").append(pageNum);
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sb.append(", pageSize=").append(pageSize);
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sb.append(", size=").append(size);
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sb.append(", startRow=").append(startRow);
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sb.append(", endRow=").append(endRow);
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sb.append(", total=").append(total);
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sb.append(", pages=").append(pages);
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sb.append(", list=").append(list);
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sb.append(", prePage=").append(prePage);
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sb.append(", nextPage=").append(nextPage);
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sb.append(", isFirstPage=").append(isFirstPage);
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sb.append(", isLastPage=").append(isLastPage);
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sb.append(", hasPreviousPage=").append(hasPreviousPage);
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sb.append(", hasNextPage=").append(hasNextPage);
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sb.append(", navigatePages=").append(navigatePages);
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sb.append(", navigateFirstPage=").append(navigateFirstPage);
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sb.append(", navigateLastPage=").append(navigateLastPage);
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sb.append(", navigatepageNums=");
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if (navigatepageNums == null) {
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sb.append("null");
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} else {
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sb.append('[');
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for (int i = 0; i < navigatepageNums.length; ++i) {
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sb.append(i == 0 ? "" : ", ").append(navigatepageNums[i]);
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}
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sb.append(']');
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}
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sb.append('}');
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return sb.toString();
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}
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}
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