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Java > Open Source Codes > org > apache > cayenne > graph > GraphEvent


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19
20 package org.apache.cayenne.graph;
21
22 import org.apache.cayenne.event.CayenneEvent;
23
24 /**
25  * An event indicating a change in the object graph. A change is expressed as a GraphDiff,
26  * so the easiest way to process the event is the following:
27  *
28  * <pre>
29  * GraphChangeHandler handler = ..;
30  * event.getDiff().apply(handler);
31  * </pre>
32  *
33  * @since 1.2
34  * @author Andrus Adamchik
35  */
36 public class GraphEvent extends CayenneEvent {
37
38     protected GraphDiff diff;
39
40     public GraphEvent(Object JavaDoc source, GraphDiff diff) {
41         this(source, source, diff);
42     }
43
44     public GraphEvent(Object JavaDoc source, Object JavaDoc postedBy, GraphDiff diff) {
45         super(source, postedBy, null);
46         this.diff = diff;
47     }
48
49     public GraphDiff getDiff() {
50         return diff;
51     }
52 }
53
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