| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.jexl3.scripting; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.InputStreamReader; |
| |
| import java.nio.charset.Charset; |
| import javax.script.ScriptEngine; |
| import javax.script.ScriptException; |
| |
| /** |
| * Test application for JexlScriptEngine (JSR-223 implementation). |
| * |
| * @since 2.0 |
| */ |
| public class Main { |
| |
| /** |
| * Reads an input. |
| * |
| * @param charset the charset or null for default charset |
| * @param fileName the file name or null for stdin |
| * @return the reader |
| * @throws Exception if anything goes wrong |
| */ |
| static BufferedReader read(final Charset charset, final String fileName) throws Exception { |
| return new BufferedReader( |
| new InputStreamReader( |
| fileName == null |
| ? System.in |
| : new FileInputStream(new File(fileName)), |
| charset == null |
| ? Charset.defaultCharset() |
| : charset)); |
| } |
| |
| /** |
| * Test application for JexlScriptEngine (JSR-223 implementation). |
| * |
| * If a single argument is present, it is treated as a file name of a JEXL |
| * script to be evaluated. Any exceptions terminate the application. |
| * |
| * Otherwise, lines are read from standard input and evaluated. |
| * ScriptExceptions are logged, and do not cause the application to exit. |
| * This is done so that interactive testing is easier. |
| * |
| * @param args (optional) file name to evaluate. Stored in the args variable. |
| * |
| * @throws Exception if parsing or IO fail |
| */ |
| public static void main(final String[] args) throws Exception { |
| final JexlScriptEngineFactory fac = new JexlScriptEngineFactory(); |
| final ScriptEngine engine = fac.getScriptEngine(); |
| engine.put("args", args); |
| if (args.length == 1){ |
| final Object value = engine.eval(read(null, args[0])); |
| System.out.println("Return value: "+value); |
| } else { |
| final BufferedReader console = read(null, null); |
| String line; |
| System.out.print("> "); |
| while(null != (line=console.readLine())){ |
| try { |
| final Object value = engine.eval(line); |
| System.out.println("Return value: "+value); |
| } catch (final ScriptException e) { |
| System.out.println(e.getLocalizedMessage()); |
| } |
| System.out.print("> "); |
| } |
| } |
| } |
| } |