1 package org.apache.helix.store;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Comparator;
23
24 import org.apache.log4j.Logger;
25
26 public class PropertyJsonComparator<T> implements Comparator<T>
27 {
28 static private Logger LOG = Logger.getLogger(PropertyJsonComparator.class);
29 private final PropertyJsonSerializer<T> _serializer;
30
31 public PropertyJsonComparator(Class<T> clazz)
32 {
33 _serializer = new PropertyJsonSerializer<T>(clazz);
34 }
35
36 @Override
37 public int compare(T arg0, T arg1)
38 {
39 if (arg0 == null && arg1 == null)
40 {
41 return 0;
42 }
43 else if (arg0 == null && arg1 != null)
44 {
45 return -1;
46 }
47 else if (arg0 != null && arg1 == null)
48 {
49 return 1;
50 }
51 else
52 {
53 try
54 {
55 String s0 = new String(_serializer.serialize(arg0));
56 String s1 = new String(_serializer.serialize(arg1));
57
58 return s0.compareTo(s1);
59 }
60 catch (PropertyStoreException e)
61 {
62 // e.printStackTrace();
63 LOG.warn(e.getMessage());
64 return -1;
65 }
66 }
67 }
68
69 }