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: package org.apache.cocoon.caching.validity;
18:
19: import java.io.Serializable;
20:
21: /**
22: * Base class encapsulating the information about an external
23: * uncache event.
24: *
25: * @author Geoff Howard (ghoward@apache.org)
26: * @version $Id: Event.java 433543 2006-08-22 06:22:54Z crossley $
27: */
28: public abstract class Event implements Serializable {
29:
30: /**
31: * Used by EventValidity for equals(Object o) which
32: * is important for determining whether a received event
33: * should uncache a held Pipeline key.
34: *
35: * @param e Another Event to compare.
36: * @return true if
37: */
38: public abstract boolean equals(Event e);
39:
40: /**
41: * This hash code is the only way the system can locate
42: * matching Events when a new event notification is received.
43: */
44: public abstract int hashCode();
45:
46: public boolean equals(Object o) {
47: if (o instanceof Event) {
48: return equals((Event) o);
49: }
50: return false;
51: }
52:
53: }
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