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Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。
package cn.hutool.db.sql;
import cn.hutool.core.util.StrUtil;
/**
* 排序方式(升序或者降序)
*
* @author Looly
*/
public enum Direction {
/**
* 升序
*/
ASC,
/**
* 降序
*/
DESC;
/**
* 根据字符串值返回对应Direction值
*
* @param value 排序方式字符串,只能是 ASC或DESC
* @return Direction,{@code null}表示提供的value为空
* @throws IllegalArgumentException in case the given value cannot be parsed into an enum value.
*/
public static Direction fromString(String value) throws IllegalArgumentException {
if (StrUtil.isEmpty(value)) {
return null;
}
// 兼容元数据中ASC和DESC表示
if (1 == value.length()) {
if ("A".equalsIgnoreCase(value)) {
return ASC;
} else if ("D".equalsIgnoreCase(value)) {
return DESC;
}
}
try {
return Direction.valueOf(value.toUpperCase());
} catch (Exception e) {
throw new IllegalArgumentException(StrUtil.format(
"Invalid value [{}] for orders given! Has to be either 'desc' or 'asc' (case insensitive).", value), e);
}
}
}
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