01 /*
02 * SPDX-License-Identifier: Apache-2.0
03 *
04 * Copyright 2008-2017 the original author or authors.
05 *
06 * Licensed under the Apache License, Version 2.0 (the "License");
07 * you may not use this file except in compliance with the License.
08 * You may obtain a copy of the License at
09 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package griffon.core.event;
19
20 import javax.annotation.Nonnull;
21 import java.util.EventObject;
22
23 /**
24 * @author Andres Almiray
25 */
26 public abstract class Event extends EventObject {
27 private static final long serialVersionUID = -2080599710005680415L;
28
29 /**
30 * System time when the event happened
31 */
32 private final long timestamp;
33
34 /**
35 * Create a new Event.
36 *
37 * @param source the component that published the event (never <code>null</code>)
38 */
39 public Event(@Nonnull Object source) {
40 super(source);
41 this.timestamp = System.currentTimeMillis();
42 }
43
44 /**
45 * Return the system time in milliseconds when the event happened.
46 */
47 public final long getTimestamp() {
48 return this.timestamp;
49 }
50 }
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