1 package com.atlassian.johnson;
2
3 import java.util.Collections;
4 import java.util.List;
5 import java.util.concurrent.CopyOnWriteArrayList;
6
7 import com.atlassian.johnson.event.Event;
8
9 /**
10 * A default implementation of {@link JohnsonEventContainer} which stores events in a list.
11 * <p/>
12 * Note: This implementation is thread-safe.
13 *
14 * @since 2.0
15 */
16 public class DefaultJohnsonEventContainer implements JohnsonEventContainer
17 {
18 private final List<Event> events = new CopyOnWriteArrayList<Event>();
19
20 /**
21 * Adds the provided {@link Event} to the list.
22 *
23 * @param event the event to add
24 */
25 @Override
26 public void addEvent(Event event)
27 {
28 events.add(event);
29 }
30
31 /**
32 * Retrieves an <i>unmodifiable</i> view of the current {@link Event} list.
33 *
34 * @return an unmodifiable collection of zero or more events
35 */
36 @Override
37 public List<Event> getEvents()
38 {
39 return Collections.unmodifiableList(events);
40 }
41
42 /**
43 * Retrieves a flag indicating whether there are any {@link Event}s in the list.
44 *
45 * @return {@link true} if the event list is not empty; otherwise, {@code false}
46 */
47 @Override
48 public boolean hasEvents()
49 {
50 return !events.isEmpty();
51 }
52
53 /**
54 * Removes the provided {@link Event} from the list, if it can be found.
55 *
56 * @param event the event to remove
57 */
58 @Override
59 public void removeEvent(Event event)
60 {
61 events.remove(event);
62 }
63 }