1 /*
2 * Licensed under the Apache License, Version 2.0 (the "License");
3 * you may not use this file except in compliance with the License.
4 * You may obtain a copy of the License at
5 *
6 * http://www.apache.org/licenses/LICENSE-2.0
7 *
8 * Unless required by applicable law or agreed to in writing, software
9 * distributed under the License is distributed on an "AS IS" BASIS,
10 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 * See the License for the specific language governing permissions and
12 * limitations under the License.
13 *
14 */
15
16 package org.esigate.impl;
17
18 import java.util.Comparator;
19
20 /**
21 * Weight-based comparator for UriMapping objects.
22 *
23 * <p>
24 * Used to ensure detailed mapping rules are evaluated before the generic ones.
25 *
26 * @author Nicolas Richeton
27 *
28 */
29 public class UriMappingComparator implements Comparator<UriMapping> {
30
31 @Override
32 public int compare(UriMapping o1, UriMapping o2) {
33 int weightCompare = o2.getWeight() - o1.getWeight();
34
35 if (weightCompare != 0) {
36 return weightCompare;
37 }
38
39 // 2 objects with the same weight are usually not the same.
40 // This is required to prevent removal of different rules using the same
41 // weight within a SortedMap.
42 return o2.hashCode() - o1.hashCode();
43 }
44
45 }