01 /*
02 * Copyright 2008-2015 the original author or authors.
03 *
04 * Licensed under the Apache License, Version 2.0 (the "License");
05 * you may not use this file except in compliance with the License.
06 * You may obtain a copy of the License at
07 *
08 * http://www.apache.org/licenses/LICENSE-2.0
09 *
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 griffon.core.event;
17
18 import javax.annotation.Nonnull;
19 import java.util.EventObject;
20
21 /**
22 * @author Andres Almiray
23 */
24 public abstract class Event extends EventObject {
25 private static final long serialVersionUID = -2080599710005680415L;
26
27 /**
28 * System time when the event happened
29 */
30 private final long timestamp;
31
32 /**
33 * Create a new Event.
34 *
35 * @param source the component that published the event (never <code>null</code>)
36 */
37 public Event(@Nonnull Object source) {
38 super(source);
39 this.timestamp = System.currentTimeMillis();
40 }
41
42 /**
43 * Return the system time in milliseconds when the event happened.
44 */
45 public final long getTimestamp() {
46 return this.timestamp;
47 }
48 }
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