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
18 package org.apache.commons.jexl2.scripting;
19
20 import java.io.BufferedReader;
21 import java.io.FileReader;
22 import java.io.InputStreamReader;
23
24 import javax.script.ScriptEngine;
25 import javax.script.ScriptException;
26
27 /**
28 * Test application for JexlScriptEngine (JSR-223 implementation).
29 * @since 2.0
30 */
31 public class Main {
32
33 /**
34 * Test application for JexlScriptEngine (JSR-223 implementation).
35 *
36 * If a single argument is present, it is treated as a filename of a JEXL
37 * script to be evaluated. Any exceptions terminate the application.
38 *
39 * Otherwise, lines are read from standard input and evaluated.
40 * ScriptExceptions are logged, and do not cause the application to exit.
41 * This is done so that interactive testing is easier.
42 *
43 * @param args (optional) filename to evaluate. Stored in the args variable.
44 *
45 * @throws Exception if parsing or IO fail
46 */
47 public static void main(String[] args) throws Exception {
48 JexlScriptEngineFactory fac = new JexlScriptEngineFactory();
49 ScriptEngine engine = fac.getScriptEngine();
50 engine.put("args", args);
51 if (args.length == 1){
52 Object value = engine.eval(new FileReader(args[0]));
53 System.out.println("Return value: "+value);
54 } else {
55 BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
56 String line;
57 System.out.print("> ");
58 while(null != (line=console.readLine())){
59 try {
60 Object value = engine.eval(line);
61 System.out.println("Return value: "+value);
62 } catch (ScriptException e) {
63 System.out.println(e.getLocalizedMessage());
64 }
65 System.out.print("> ");
66 }
67 }
68 }
69 }