package com.whyc.util;
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import com.github.pagehelper.PageInfo;
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import java.util.LinkedList;
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import java.util.List;
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public class PageInfoUtils {
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public static <T> PageInfo<T> list2PageInfo(List<T> arrayList, Integer pageNum, Integer pageSize) {
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//实现list分页
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//PageHelper.startPage(pageNum, pageSize);
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int pageStart = pageNum == 1 ? 0 : (pageNum - 1) * pageSize;
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int pageEnd = arrayList.size() < pageSize * pageNum ? arrayList.size() : pageSize * pageNum;
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List<T> pageResult = new LinkedList<T>();
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if (arrayList.size() > pageStart) {
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pageResult = arrayList.subList(pageStart, pageEnd);
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}
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PageInfo<T> pageInfo = new PageInfo<T>(pageResult);
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//获取PageInfo其他参数
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pageInfo.setTotal(arrayList.size());
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int endRow = pageInfo.getEndRow() == 0 ? 0 : (pageNum - 1) * pageSize + pageInfo.getEndRow() + 1;
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pageInfo.setEndRow(endRow);
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boolean hasNextPage = arrayList.size() <= pageSize * pageNum ? false : true;
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pageInfo.setHasNextPage(hasNextPage);
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boolean hasPreviousPage = pageNum == 1 ? false : true;
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pageInfo.setHasPreviousPage(hasPreviousPage);
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pageInfo.setIsFirstPage(!hasPreviousPage);
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boolean isLastPage = (arrayList.size() > pageSize * (pageNum - 1) && arrayList.size() <= pageSize * pageNum) ? true : false;
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pageInfo.setIsLastPage(isLastPage);
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int pages = arrayList.size() % pageSize == 0 ? arrayList.size() / pageSize : (arrayList.size() / pageSize) + 1;
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pageInfo.setNavigateLastPage(pages);
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int[] navigatePageNums = new int[pages];
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for (int i = 1; i < pages; i++) {
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navigatePageNums[i - 1] = i;
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}
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pageInfo.setNavigatepageNums(navigatePageNums);
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int nextPage = pageNum < pages ? pageNum + 1 : 0;
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pageInfo.setNextPage(nextPage);
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pageInfo.setPageNum(pageNum);
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pageInfo.setPageSize(pageSize);
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pageInfo.setPages(pages);
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pageInfo.setPrePage(pageNum - 1);
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pageInfo.setSize(pageInfo.getList().size());
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int starRow = arrayList.size() < pageSize * pageNum ? 1 + pageSize * (pageNum - 1) : 0;
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pageInfo.setStartRow(starRow);
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return pageInfo;
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}
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}
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