/
PageInfo.java
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/
PageInfo.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2023 abel533@gmail.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.github.pagehelper;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* 对Page<E>结果进行包装
* <p/>
* 新增分页的多项属性,主要参考:http://bbs.csdn.net/topics/360010907
*
* @author liuzh/abel533/isea533
* @version 3.3.0
* @since 3.2.2
* 项目地址 : http://git.oschina.net/free/Mybatis_PageHelper
*/
@SuppressWarnings({"rawtypes", "unchecked"})
public class PageInfo<T> extends PageSerializable<T> {
public static final int DEFAULT_NAVIGATE_PAGES = 8;
//private PageInfo EMPTY = new PageInfo(Collections.emptyList(), 0);
/**
* 当前页
*/
private int pageNum;
/**
* 每页的数量
*/
private int pageSize;
/**
* 当前页的数量
*/
private int size;
/**
* 由于startRow和endRow不常用,这里说个具体的用法
* 可以在页面中"显示startRow到endRow 共size条数据"
* 当前页面第一个元素在数据库中的行号
*/
private long startRow;
/**
* 当前页面最后一个元素在数据库中的行号
*/
private long endRow;
/**
* 总页数
*/
private int pages;
/**
* 前一页
*/
private int prePage;
/**
* 下一页
*/
private int nextPage;
/**
* 是否为第一页
*/
private boolean isFirstPage = false;
/**
* 是否为最后一页
*/
private boolean isLastPage = false;
/**
* 是否有前一页
*/
private boolean hasPreviousPage = false;
/**
* 是否有下一页
*/
private boolean hasNextPage = false;
/**
* 导航页码数
*/
private int navigatePages;
/**
* 所有导航页号
*/
private int[] navigatepageNums;
/**
* 导航条上的第一页
*/
private int navigateFirstPage;
/**
* 导航条上的最后一页
*/
private int navigateLastPage;
public PageInfo() {
}
/**
* 包装Page对象
*
* @param list
*/
public PageInfo(List<? extends T> list) {
this(list, DEFAULT_NAVIGATE_PAGES);
}
/**
* 包装Page对象
*
* @param list page结果
* @param navigatePages 页码数量
*/
public PageInfo(List<? extends T> list, int navigatePages) {
super(list);
if (list instanceof Page) {
Page page = (Page) list;
this.pageNum = page.getPageNum();
this.pageSize = page.getPageSize();
this.pages = page.getPages();
this.size = page.size();
//由于结果是>startRow的,所以实际的需要+1
if (this.size == 0) {
this.startRow = 0;
this.endRow = 0;
} else {
this.startRow = page.getStartRow() + 1;
//计算实际的endRow(最后一页的时候特殊)
this.endRow = this.startRow - 1 + this.size;
}
} else if (list instanceof Collection) {
this.pageNum = 1;
this.pageSize = list.size();
this.pages = this.pageSize > 0 ? 1 : 0;
this.size = list.size();
this.startRow = 0;
this.endRow = list.size() > 0 ? list.size() - 1 : 0;
}
if (list instanceof Collection) {
calcByNavigatePages(navigatePages);
}
}
public static <T> PageInfo<T> of(List<? extends T> list) {
return new PageInfo<T>(list);
}
/**
* 手动指定总记录数获取分页信息
*
* @param total 总记录数
* @param list page结果
*/
public static <T> PageInfo<T> of(long total, List<? extends T> list) {
if (list instanceof Page) {
Page page = (Page) list;
page.setTotal(total);
}
return new PageInfo<T>(list);
}
public static <T> PageInfo<T> of(List<? extends T> list, int navigatePages) {
return new PageInfo<T>(list, navigatePages);
}
/**
* 返回一个空的 Pageinfo 对象
*
* @return
*/
public static <T> PageInfo<T> emptyPageInfo() {
return new PageInfo(Collections.emptyList(), 0);
}
public void calcByNavigatePages(int navigatePages) {
setNavigatePages(navigatePages);
//计算导航页
calcNavigatepageNums();
//计算前后页,第一页,最后一页
calcPage();
//判断页面边界
judgePageBoudary();
}
/**
* 计算导航页
*/
private void calcNavigatepageNums() {
//当总页数小于或等于导航页码数时
if (pages <= navigatePages) {
navigatepageNums = new int[pages];
for (int i = 0; i < pages; i++) {
navigatepageNums[i] = i + 1;
}
} else { //当总页数大于导航页码数时
navigatepageNums = new int[navigatePages];
int startNum = pageNum - navigatePages / 2;
int endNum = pageNum + navigatePages / 2;
if (startNum < 1) {
startNum = 1;
//(最前navigatePages页
for (int i = 0; i < navigatePages; i++) {
navigatepageNums[i] = startNum++;
}
} else if (endNum > pages) {
endNum = pages;
//最后navigatePages页
for (int i = navigatePages - 1; i >= 0; i--) {
navigatepageNums[i] = endNum--;
}
} else {
//所有中间页
for (int i = 0; i < navigatePages; i++) {
navigatepageNums[i] = startNum++;
}
}
}
}
/**
* 计算前后页,第一页,最后一页
*/
private void calcPage() {
if (navigatepageNums != null && navigatepageNums.length > 0) {
navigateFirstPage = navigatepageNums[0];
navigateLastPage = navigatepageNums[navigatepageNums.length - 1];
if (pageNum > 1) {
prePage = pageNum - 1;
}
if (pageNum < pages) {
nextPage = pageNum + 1;
}
}
}
/**
* 判定页面边界
*/
private void judgePageBoudary() {
isFirstPage = pageNum == 1;
isLastPage = pageNum == pages || pages == 0;
hasPreviousPage = pageNum > 1;
hasNextPage = pageNum < pages;
}
/**
* 数据对象转换
*
* @param function 用以转换数据对象的函数
* @param <E> 目标类型
* @return 转换了对象类型的包装结果
*/
public <E> PageInfo<E> convert(Page.Function<T, E> function) {
List<E> list = new ArrayList<E>(this.list.size());
for (T t : this.list) {
list.add(function.apply(t));
}
PageInfo<E> newPageInfo = new PageInfo<>(list);
newPageInfo.setPageNum(this.pageNum);
newPageInfo.setPageSize(this.pageSize);
newPageInfo.setSize(this.size);
newPageInfo.setStartRow(this.startRow);
newPageInfo.setEndRow(this.endRow);
newPageInfo.setTotal(this.total);
newPageInfo.setPages(this.pages);
newPageInfo.setPrePage(this.prePage);
newPageInfo.setNextPage(this.nextPage);
newPageInfo.setIsFirstPage(this.isFirstPage);
newPageInfo.setIsLastPage(this.isLastPage);
newPageInfo.setHasPreviousPage(this.hasPreviousPage);
newPageInfo.setHasNextPage(this.hasNextPage);
newPageInfo.setNavigatePages(this.navigatePages);
newPageInfo.setNavigateFirstPage(this.navigateFirstPage);
newPageInfo.setNavigateLastPage(this.navigateLastPage);
newPageInfo.setNavigatepageNums(this.navigatepageNums);
return newPageInfo;
}
/**
* 是否包含内容
*/
public boolean hasContent() {
return this.size > 0;
}
public int getPageNum() {
return pageNum;
}
public void setPageNum(int pageNum) {
this.pageNum = pageNum;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public long getStartRow() {
return startRow;
}
public void setStartRow(long startRow) {
this.startRow = startRow;
}
public long getEndRow() {
return endRow;
}
public void setEndRow(long endRow) {
this.endRow = endRow;
}
public int getPages() {
return pages;
}
public void setPages(int pages) {
this.pages = pages;
}
public int getPrePage() {
return prePage;
}
public void setPrePage(int prePage) {
this.prePage = prePage;
}
public int getNextPage() {
return nextPage;
}
public void setNextPage(int nextPage) {
this.nextPage = nextPage;
}
public boolean isIsFirstPage() {
return isFirstPage;
}
public void setIsFirstPage(boolean isFirstPage) {
this.isFirstPage = isFirstPage;
}
public boolean isIsLastPage() {
return isLastPage;
}
public void setIsLastPage(boolean isLastPage) {
this.isLastPage = isLastPage;
}
public boolean isHasPreviousPage() {
return hasPreviousPage;
}
public void setHasPreviousPage(boolean hasPreviousPage) {
this.hasPreviousPage = hasPreviousPage;
}
public boolean isHasNextPage() {
return hasNextPage;
}
public void setHasNextPage(boolean hasNextPage) {
this.hasNextPage = hasNextPage;
}
public int getNavigatePages() {
return navigatePages;
}
public void setNavigatePages(int navigatePages) {
this.navigatePages = navigatePages;
}
public int[] getNavigatepageNums() {
return navigatepageNums;
}
public void setNavigatepageNums(int[] navigatepageNums) {
this.navigatepageNums = navigatepageNums;
}
public int getNavigateFirstPage() {
return navigateFirstPage;
}
public int getNavigateLastPage() {
return navigateLastPage;
}
public void setNavigateFirstPage(int navigateFirstPage) {
this.navigateFirstPage = navigateFirstPage;
}
public void setNavigateLastPage(int navigateLastPage) {
this.navigateLastPage = navigateLastPage;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("PageInfo{");
sb.append("pageNum=").append(pageNum);
sb.append(", pageSize=").append(pageSize);
sb.append(", size=").append(size);
sb.append(", startRow=").append(startRow);
sb.append(", endRow=").append(endRow);
sb.append(", total=").append(total);
sb.append(", pages=").append(pages);
sb.append(", list=").append(list);
sb.append(", prePage=").append(prePage);
sb.append(", nextPage=").append(nextPage);
sb.append(", isFirstPage=").append(isFirstPage);
sb.append(", isLastPage=").append(isLastPage);
sb.append(", hasPreviousPage=").append(hasPreviousPage);
sb.append(", hasNextPage=").append(hasNextPage);
sb.append(", navigatePages=").append(navigatePages);
sb.append(", navigateFirstPage=").append(navigateFirstPage);
sb.append(", navigateLastPage=").append(navigateLastPage);
sb.append(", navigatepageNums=");
if (navigatepageNums == null) {
sb.append("null");
} else {
sb.append('[');
for (int i = 0; i < navigatepageNums.length; ++i) {
sb.append(i == 0 ? "" : ", ").append(navigatepageNums[i]);
}
sb.append(']');
}
sb.append('}');
return sb.toString();
}
}