package com.sandu.ximon.admin.utils;
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import java.util.Collections;
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import java.util.List;
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public class ListPageUtil<T> {
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private List<T> data;
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/** 上一页 */
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private int lastPage;
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/** 当前页 */
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private int currentPage;
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/** 下一页 */
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private int nextPage;
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//
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/** 每页条数 */
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private int pageSize;
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/** 总页数 */
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private int totalPage;
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/** 总数据条数 */
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private int totalCount;
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public ListPageUtil(List<T> data,int currentPage,int pageSize) {
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if (data == null || data.isEmpty()) {
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throw new IllegalArgumentException("data must be not empty!");
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}
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this.data = data;
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this.pageSize = pageSize;
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this.currentPage = currentPage;
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this.totalCount = data.size();
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this.totalPage = (totalCount + pageSize - 1) / pageSize;
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this.lastPage = currentPage-1>1? currentPage-1:1;
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this.nextPage = currentPage>=totalPage? totalPage: currentPage + 1;
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}
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/**
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* 得到分页后的数据
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* @return 分页后结果
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*/
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// public List<T> getPagedLst() {
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// int fromIndex = (nowPage - 1) * pageSize;
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// if (fromIndex >= data.size()) {
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// return Collections.emptyList();//空数组
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// }
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// if(fromIndex<0){
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// return Collections.emptyList();//空数组
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// }
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// int toIndex = nowPage * pageSize;
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// if (toIndex >= data.size()) {
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// toIndex = data.size();
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// }
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// return data.subList(fromIndex, toIndex);
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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 List<T> getData() {
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int fromIndex = (currentPage - 1) * pageSize;
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if (fromIndex >= data.size()) {
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return Collections.emptyList();//空数组
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}
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if(fromIndex<0){
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return Collections.emptyList();//空数组
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}
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int toIndex = currentPage * pageSize;
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if (toIndex >= data.size()) {
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toIndex = data.size();
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}
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return data.subList(fromIndex, toIndex);
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}
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public int getLastPage() {
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return lastPage;
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}
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public int getCurrentPage() {
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return currentPage;
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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 int getTotalPage() {
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return totalPage;
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}
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public int getTotalCount() {
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return totalCount;
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}
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}
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