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62 lines
1.9 KiB
62 lines
1.9 KiB
5 years ago
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# Spring OrderUtils
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- Author: [HuiFer](https://github.com/huifer)
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- 源码阅读仓库: [huifer-spring](https://github.com/huifer/spring-framework-read)
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- `org.springframework.core.annotation.OrderUtils`主要方法如下
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1. getOrder
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1. getPriority
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- 测试类`org.springframework.core.annotation.OrderUtilsTests`
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```java
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@Nullable
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public static Integer getOrder(Class<?> type) {
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// 缓存中获取
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Object cached = orderCache.get(type);
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if (cached != null) {
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// 返回 int
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return (cached instanceof Integer ? (Integer) cached : null);
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}
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/**
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* 注解工具类,寻找{@link Order}注解
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*/
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Order order = AnnotationUtils.findAnnotation(type, Order.class);
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Integer result;
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if (order != null) {
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// 返回
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result = order.value();
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} else {
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result = getPriority(type);
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}
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// key: 类名,value: intValue
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orderCache.put(type, (result != null ? result : NOT_ANNOTATED));
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return result;
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}
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```
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```java
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@Nullable
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public static Integer getPriority(Class<?> type) {
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if (priorityAnnotationType == null) {
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return null;
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}
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// 缓存中获取
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Object cached = priorityCache.get(type);
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if (cached != null) {
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// 不为空返回
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return (cached instanceof Integer ? (Integer) cached : null);
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}
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// 注解工具获取注解
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Annotation priority = AnnotationUtils.findAnnotation(type, priorityAnnotationType);
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Integer result = null;
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if (priority != null) {
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// 获取 value
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result = (Integer) AnnotationUtils.getValue(priority);
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}
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// 向缓存插入数据
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priorityCache.put(type, (result != null ? result : NOT_ANNOTATED));
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return result;
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}
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```
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