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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
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