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Java > Open Source Codes > org > apache > cocoon > caching > validity > Event


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
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 package org.apache.cocoon.caching.validity;
17
18 import java.io.Serializable JavaDoc;
19
20 /**
21  * Base class encapsulating the information about an external
22  * uncache event.
23  *
24  * @author Geoff Howard (ghoward@apache.org)
25  * @version $Id: Event.java 30932 2004-07-29 17:35:38Z vgritsenko $
26  */
27 public abstract class Event implements Serializable JavaDoc {
28     
29     /**
30      * Used by EventValidity for equals(Object o) which
31      * is important for determining whether a received event
32      * should uncache a held Pipeline key.
33      *
34      * @param e Another Event to compare.
35      * @return true if
36      */
37     public abstract boolean equals(Event e);
38     
39     /**
40      * This hash code is the only way the system can locate
41      * matching Events when a new event notification is received.
42      */
43     public abstract int hashCode();
44     
45     public boolean equals(Object JavaDoc o) {
46         if (o instanceof Event) {
47             return equals((Event)o);
48         }
49         return false;
50     }
51     
52 }
53
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