package com.dobbinsoft.fw.support.model;
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import com.alibaba.fastjson.annotation.JSONField;
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import com.baomidou.mybatisplus.core.metadata.IPage;
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import com.baomidou.mybatisplus.core.metadata.OrderItem;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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/**
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* Created with IntelliJ IDEA.
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* Description:
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* User: rize
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* Date: 2018-08-15
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* Time: 下午8:12
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*/
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@Data
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@NoArgsConstructor
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public class Page<T> implements Serializable, IPage<T> {
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private List<T> items;
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private int pageNo;
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private int pageSize;
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private long count;
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private List<OrderItem> orderItems;
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public Page(List<T> items, int pageNo, int pageSize, long count) {
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this.items = items;
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this.pageNo = pageNo;
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this.pageSize = pageSize;
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this.count = count;
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}
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public long getTotalPageNo() {
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return count / pageSize + (count % pageSize == 0 ? 0 : 1);
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}
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public List<T> getItems() {
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return items;
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}
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public boolean hasNext() {
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return getPageNo() < getTotalPageNo();
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}
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public boolean hasPrevious() {
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return getPageNo() > 1;
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}
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public String getMsg() {
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return "第" + pageNo + "页,共" + count + "条";
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}
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public int getCode() {
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return 0;
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}
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public long getCount() {
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return this.count;
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}
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/** 实现MP的IPage接口，以另一种形式展示 **/
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@Override
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@JSONField(serialize = false)
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public List<OrderItem> orders() {
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return orderItems;
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}
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@Override
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@JSONField(serialize = false)
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public List<T> getRecords() {
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return this.items;
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}
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@Override
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@JSONField(serialize = false)
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public IPage<T> setRecords(List<T> records) {
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this.setItems(records);
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return this;
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}
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public long getTotal() {
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return getCount();
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}
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@Override
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public IPage<T> setTotal(long total) {
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this.setCount(total);
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return this;
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}
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@Override
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@JSONField(serialize = false)
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public long getSize() {
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return this.getPageSize();
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}
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@Override
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@JSONField(serialize = false)
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public IPage<T> setSize(long size) {
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this.setPageSize((int) size);
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return this;
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}
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@Override
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@JSONField(serialize = false)
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public long getCurrent() {
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return this.getPageNo();
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}
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@Override
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@JSONField(serialize = false)
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public IPage<T> setCurrent(long current) {
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this.setPageNo((int) current);
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return this;
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}
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/**
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* 将分页中的 T 数据类型转换为 R 数据类型
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* @param transMethod
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* @param <R>
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* @return
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*/
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public <R> Page<R> trans(Function<T, R> transMethod) {
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this.setItems((List) this.items.stream().map(transMethod).collect(Collectors.toList()));
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return (Page<R>) this;
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}
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/**
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* 正向排序
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* @param columns
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* @return
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*/
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public Page<T> ases(String... columns) {
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this.orderItems = OrderItem.ascs(columns);
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return this;
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}
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/**
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* 正向排序
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* @param columns
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* @return
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*/
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public Page<T> descs(String... columns) {
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this.orderItems = OrderItem.descs(columns);
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return this;
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}
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public Page<T> sort(boolean isAsc, String...columns) {
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if (isAsc) {
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return ases(columns);
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} else {
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return descs(columns);
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}
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}
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public static <T> Page<T> div(int pageNo, int pageSize, Class<T> clazz) {
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Page<T> page = new Page<T>();
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page.setPageNo(pageNo);
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page.setPageSize(pageSize);
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return page;
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}
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public <R> Page<R> replace(List<R> items) {
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this.setItems((List) items);
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return (Page<R>) this;
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}
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private static List<?> emptyArray = new ArrayList<>();
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public static Page emptyPage = new Page(emptyArray, 1, 15, 0);
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}
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