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96 lines
2.7 KiB
96 lines
2.7 KiB
# Spring OrderComparator
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- Author: [HuiFer](https://github.com/huifer)
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- 源码阅读仓库: [SourceHot-Spring](https://github.com/SourceHot/spring-framework-read)
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```java
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private int doCompare(@Nullable Object o1, @Nullable Object o2, @Nullable OrderSourceProvider sourceProvider) {
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boolean p1 = (o1 instanceof PriorityOrdered);
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boolean p2 = (o2 instanceof PriorityOrdered);
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if (p1 && !p2) {
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return -1;
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} else if (p2 && !p1) {
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return 1;
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}
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int i1 = getOrder(o1, sourceProvider);
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int i2 = getOrder(o2, sourceProvider);
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// 对比两个Order值得大小返回
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return Integer.compare(i1, i2);
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}
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```
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```java
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private int getOrder(@Nullable Object obj, @Nullable OrderSourceProvider sourceProvider) {
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Integer order = null;
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if (obj != null && sourceProvider != null) {
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// 获取Order
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Object orderSource = sourceProvider.getOrderSource(obj);
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if (orderSource != null) {
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if (orderSource.getClass().isArray()) {
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// 获取 OrderSourceProvider 的值
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Object[] sources = ObjectUtils.toObjectArray(orderSource);
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for (Object source : sources) {
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// 找 order 返回
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order = findOrder(source);
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if (order != null) {
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break;
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}
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}
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} else {
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// 寻找 order
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order = findOrder(orderSource);
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}
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}
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}
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return (order != null ? order : getOrder(obj));
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}
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```
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- 测试用例
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```java
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@Test
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public void compareWithSourceProviderArray() {
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Comparator<Object> customComparator = this.comparator.withSourceProvider(
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new TestSourceProvider(5L, new Object[]{new StubOrdered(10), new StubOrdered(-25)}));
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assertEquals(-1, customComparator.compare(5L, new Object()));
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}
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```
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```java
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@Nullable
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protected Integer findOrder(Object obj) {
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// 获取Ordered实现类
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return (obj instanceof Ordered ? ((Ordered) obj).getOrder() : null);
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}
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```
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```java
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private static final class StubOrdered implements Ordered {
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private final int order;
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public StubOrdered(int order) {
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this.order = order;
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}
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@Override
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public int getOrder() {
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return this.order;
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}
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}
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```
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最终`Integer.compare(i1, i2)`比较返回 OK !
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