package com.cloud.common.utils;
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import java.util.Map;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.collections4.MapUtils;
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import org.springframework.util.CollectionUtils;
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/**
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* 分页参数处理工具
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*
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* @author bsk
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*
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*/
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@Slf4j
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public class PageUtil {
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/**
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* 分页参数，起始位置，从0开始
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*/
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public static final String START = "start";
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/**
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* 分页参数，每页数据条数
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*/
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public static final String LENGTH = "length";
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/**
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* 转换并校验分页参数<br>
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* mybatis中limit #{start, JdbcType=INTEGER}, #{length,
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* JdbcType=INTEGER}里的类型转换貌似失效<br>
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* 我们这里先把他转成Integer的类型
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*
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* @param params
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* @param required
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* 分页参数是否是必填
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*/
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public static void pageParamConver(Map<String, Object> params, boolean required) {
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if (required) {
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// 分页参数必填时，校验参数
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if (params == null || !params.containsKey(START) || !params.containsKey(LENGTH)) {
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throw new IllegalArgumentException("请检查分页参数," + START + "," + LENGTH);
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}
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}
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if (!CollectionUtils.isEmpty(params)) {
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if (params.containsKey(START)) {
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Integer start = MapUtils.getInteger(params, START);
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if (start < 0) {
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log.error("start：{}，重置为0", start);
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start = 0;
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}
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params.put(START, start);
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}
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if (params.containsKey(LENGTH)) {
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Integer length = MapUtils.getInteger(params, LENGTH);
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if (length < 0) {
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log.error("length：{}，重置为0", length);
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length = 0;
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}
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params.put(LENGTH, length);
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}
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}
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}
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}
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