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Java > Open Source Codes > org > springframework > core > annotation > AnnotationAwareOrderComparator


1 /*
2  * Copyright 2002-2006 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.springframework.core.annotation;
18
19 import org.springframework.core.OrderComparator;
20 import org.springframework.core.Ordered;
21
22 /**
23  * {@link java.util.Comparator} implementation that checks
24  * {@link org.springframework.core.Ordered} as well as the
25  * {@link Order} annotation, with an order value provided by an
26  * <code>Ordered</code> instance overriding a statically defined
27  * annotation value (if any).
28  *
29  * @author Juergen Hoeller
30  * @since 2.0.1
31  * @see org.springframework.core.Ordered
32  * @see Order
33  */
34 public class AnnotationAwareOrderComparator extends OrderComparator {
35
36     protected int getOrder(Object JavaDoc obj) {
37         if (obj instanceof Ordered) {
38             return ((Ordered) obj).getOrder();
39         }
40         if (obj != null) {
41             Order order = obj.getClass().getAnnotation(Order.class);
42             if (order != null) {
43                 return order.value();
44             }
45         }
46         return Ordered.LOWEST_PRECEDENCE;
47     }
48
49 }
50
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