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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   * &lt;parallel&gt; SCXML element, which is a wrapper element to
    25   * encapsulate parallel state machines. For the &lt;parallel&gt; element
    26   * to be useful, each of its &lt;state&gt; substates must itself be
    27   * complex, that is, one with either &lt;state&gt; or &lt;parallel&gt;
    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 &lt;parallel&gt;.
    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