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.test;
018    
019    import org.apache.commons.scxml.Evaluator;
020    import org.apache.commons.scxml.env.jexl.JexlEvaluator;
021    
022    /**
023     * Standalone SCXML interpreter, useful for command-line testing and
024     * debugging, where expressions are JEXL expressions.
025     *
026     * <p>USAGE:</p>
027     * <p><code>java org.apache.commons.scxml.test.StandaloneJexlExpressions
028     *          url</code></p>
029     * <p>or</p>
030     * <p><code>java org.apache.commons.scxml.test.StandaloneJexlExpressions
031     *          filename</code>
032     * </p>
033     *
034     * <p>RUNNING:</p>
035     * <ul>
036     *  <li>Enter a space-separated list of "events"</li>
037     *  <li>To quit, enter "quit"</li>
038     *  <li>To populate a variable in the current context,
039     *      type "name=value"</li>
040     *  <li>To reset state machine, enter "reset"</li>
041     * </ul>
042     *
043     */
044    public final class StandaloneJexlExpressions {
045    
046        /**
047         * Launcher.
048         * @param args The arguments, one expected, the URI or filename of the
049         *             SCXML document
050         */
051        public static void main(final String[] args) {
052            if (args.length < 1) {
053                System.out.println("USAGE: java "
054                        + StandaloneJexlExpressions.class.getName()
055                        + "<url|filename>");
056                System.exit(-1);
057            }
058            Evaluator evaluator = new JexlEvaluator();
059            StandaloneUtils.execute(args[0], evaluator);
060        }
061    
062        /**
063         * Discourage instantiation since this is a utility class.
064         */
065        private StandaloneJexlExpressions() {
066            super();
067        }
068    
069    }
070