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 */
017package org.apache.commons.scxml2.test;
018
019import org.apache.commons.scxml2.Evaluator;
020import org.apache.commons.scxml2.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.scxml2.test.StandaloneJexlExpressions
028 *          url</code></p>
029 * <p>or</p>
030 * <p><code>java org.apache.commons.scxml2.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 */
044public 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