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17 package org.apache.commons.scxml.model;
18
19 import java.util.LinkedHashSet;
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 = 2L;
37
38 /***
39 * The set of parallel state machines contained in this <parallel>.
40 */
41 private Set children;
42
43 /***
44 * Constructor.
45 */
46 public Parallel() {
47 this.children = new LinkedHashSet();
48 }
49
50 /***
51 * Get the set of parallel state machines contained in this Parallel.
52 *
53 * @return Returns the state.
54 *
55 * @deprecated Use getChildren() instead.
56 */
57 public final Set getStates() {
58 return children;
59 }
60
61 /***
62 * Add a State to the list of parallel state machines contained
63 * in this Parallel.
64 *
65 * @param state The state to add.
66 *
67 * @deprecated Use addChild(TransitionTarget) instead.
68 */
69 public final void addState(final State state) {
70 if (state != null) {
71 this.children.add(state);
72 state.setParent(this);
73 }
74 }
75
76 /***
77 * Get the set of child transition targets (may be empty).
78 *
79 * @return Set Returns the children.
80 *
81 * @since 0.7
82 */
83 public final Set getChildren() {
84 return children;
85 }
86
87 /***
88 * Add a child.
89 *
90 * @param tt A child transition target.
91 *
92 * @since 0.7
93 */
94 public final void addChild(final TransitionTarget tt) {
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96 this.children.add(tt);
97 tt.setParent(this);
98 }
99
100 }
101