    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *     http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.scxml.model;
    018
    019    import java.util.LinkedHashSet;
    020    import java.util.Set;
    021
    022    /**
    023     * The class in this SCXML object model that corresponds to the
    024     * <parallel> SCXML element, which is a wrapper element to
    025     * encapsulate parallel state machines. For the <parallel> element
    026     * to be useful, each of its <state> substates must itself be
    027     * complex, that is, one with either <state> or <parallel>
    028     * children.
    029     *
    030     */
    031    public class Parallel extends TransitionTarget {
    032
    033        /**
    034         * Serial version UID.
    035         */
    036        private static final long serialVersionUID = 2L;
    037
    038        /**
    039         * The set of parallel state machines contained in this <parallel>.
    040         */
    041        private Set children;
    042
    043        /**
    044         * Constructor.
    045         */
    046        public Parallel() {
    047            this.children = new LinkedHashSet();
    048        }
    049
    050        /**
    051         * Get the set of parallel state machines contained in this Parallel.
    052         *
    053         * @return Returns the state.
    054         *
    055         * @deprecated Use getChildren() instead.
    056         */
    057        public final Set getStates() {
    058            return children;
    059        }
    060
    061        /**
    062         * Add a State to the list of parallel state machines contained
    063         * in this Parallel.
    064         *
    065         * @param state The state to add.
    066         *
    067         * @deprecated Use addChild(TransitionTarget) instead.
    068         */
    069        public final void addState(final State state) {
    070            if (state != null) {
    071                this.children.add(state);
    072                state.setParent(this);
    073            }
    074        }
    075
    076        /**
    077         * Get the set of child transition targets (may be empty).
    078         *
    079         * @return Set Returns the children.
    080         *
    081         * @since 0.7
    082         */
    083        public final Set getChildren() {
    084            return children;
    085        }
    086
    087        /**
    088         * Add a child.
    089         *
    090         * @param tt A child transition target.
    091         *
    092         * @since 0.7
    093         */
    094        public final void addChild(final TransitionTarget tt) {
    095            // TODO: State is a sufficient enough type for the parameter
    096            this.children.add(tt);
    097            tt.setParent(this);
    098        }
    099
    100    }
    101