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18 package org.apache.commons.scxml;
19
20 import org.apache.commons.scxml.model.Transition;
21 import org.apache.commons.scxml.model.TransitionTarget;
22
23 /***
24 * Listener interface for observable entities in the SCXML model.
25 * Observable entities include {@link org.apache.commons.scxml.model.SCXML}
26 * instances (subscribe to all entry, exit and transition notifications),
27 * {@link org.apache.commons.scxml.model.State} instances (subscribe to
28 * particular entry and exit notifications) and
29 * {@link org.apache.commons.scxml.model.Transition} instances (subscribe to
30 * particular transitions).
31 *
32 */
33 public interface SCXMLListener {
34
35 /***
36 * Handle the entry into a TransitionTarget.
37 *
38 * @param state The TransitionTarget entered
39 */
40 void onEntry(TransitionTarget state);
41
42 /***
43 * Handle the exit out of a TransitionTarget.
44 *
45 * @param state The TransitionTarget exited
46 */
47 void onExit(TransitionTarget state);
48
49 /***
50 * Handle the transition.
51 *
52 * @param from The source TransitionTarget
53 * @param to The destination TransitionTarget
54 * @param transition The Transition taken
55 */
56 void onTransition(TransitionTarget from, TransitionTarget to,
57 Transition transition);
58
59 }
60