01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17:
18: package org.apache.catalina.manager.util;
19:
20: import java.util.Comparator;
21:
22: import org.apache.catalina.Session;
23:
24: /**
25: * Comparator which permits to compare on a session's content
26: * @author Cédrik LIME
27: */
28: public abstract class BaseSessionComparator implements Comparator {
29:
30: /**
31: *
32: */
33: public BaseSessionComparator() {
34: super ();
35: }
36:
37: public abstract Comparable getComparableObject(Session session);
38:
39: /* (non-Javadoc)
40: * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
41: */
42: public final int compare(Object o1, Object o2) {
43: Comparable c1 = getComparableObject((Session) o1);
44: Comparable c2 = getComparableObject((Session) o2);
45: return c1 == null ? (c2 == null ? 0 : -1) : (c2 == null ? 1
46: : c1.compareTo(c2));
47: }
48: }
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