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17 package org.apache.commons.scxml.model;
18
19 import java.util.HashSet;
20 import java.util.Set;
21
22 /***
23 * The class in this SCXML object model that corresponds to the
24 * <parallel> SCXML element, which is a wrapper element to
25 * encapsulate parallel state machines. For the <parallel> element
26 * to be useful, each of its <state> substates must itself be
27 * complex, that is, one with either <state> or <parallel>
28 * children.
29 *
30 */
31 public class Parallel extends TransitionTarget {
32
33 /***
34 * Serial version UID.
35 */
36 private static final long serialVersionUID = 1L;
37
38 /***
39 * The set of parallel state machines contained in this <parallel>.
40 */
41 private Set states;
42
43 /***
44 * Constructor.
45 */
46 public Parallel() {
47 this.states = new HashSet();
48 }
49
50 /***
51 * Get the set of parallel state machines contained in this Parallel.
52 *
53 * @return Returns the state.
54 */
55 public final Set getStates() {
56 return states;
57 }
58
59 /***
60 * Add a State to the list of parallel state machines contained
61 * in this Parallel.
62 *
63 * @param state The state to add.
64 */
65 public final void addState(final State state) {
66 if (state != null) {
67 this.states.add(state);
68 }
69 }
70
71 }
72