001/*
002 * Copyright 2002-2015 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.scripting.bsh;
018
019import java.io.IOException;
020import java.io.StringReader;
021import java.util.Map;
022
023import bsh.EvalError;
024import bsh.Interpreter;
025
026import org.springframework.beans.factory.BeanClassLoaderAware;
027import org.springframework.scripting.ScriptCompilationException;
028import org.springframework.scripting.ScriptEvaluator;
029import org.springframework.scripting.ScriptSource;
030
031/**
032 * BeanShell-based implementation of Spring's {@link ScriptEvaluator} strategy interface.
033 *
034 * @author Juergen Hoeller
035 * @since 4.0
036 * @see Interpreter#eval(String)
037 */
038public class BshScriptEvaluator implements ScriptEvaluator, BeanClassLoaderAware {
039
040        private ClassLoader classLoader;
041
042
043        /**
044         * Construct a new BshScriptEvaluator.
045         */
046        public BshScriptEvaluator() {
047        }
048
049        /**
050         * Construct a new BshScriptEvaluator.
051         * @param classLoader the ClassLoader to use for the {@link Interpreter}
052         */
053        public BshScriptEvaluator(ClassLoader classLoader) {
054                this.classLoader = classLoader;
055        }
056
057
058        @Override
059        public void setBeanClassLoader(ClassLoader classLoader) {
060                this.classLoader = classLoader;
061        }
062
063
064        @Override
065        public Object evaluate(ScriptSource script) {
066                return evaluate(script, null);
067        }
068
069        @Override
070        public Object evaluate(ScriptSource script, Map<String, Object> arguments) {
071                try {
072                        Interpreter interpreter = new Interpreter();
073                        interpreter.setClassLoader(this.classLoader);
074                        if (arguments != null) {
075                                for (Map.Entry<String, Object> entry : arguments.entrySet()) {
076                                        interpreter.set(entry.getKey(), entry.getValue());
077                                }
078                        }
079                        return interpreter.eval(new StringReader(script.getScriptAsString()));
080                }
081                catch (IOException ex) {
082                        throw new ScriptCompilationException(script, "Cannot access BeanShell script", ex);
083                }
084                catch (EvalError ex) {
085                        throw new ScriptCompilationException(script, ex);
086                }
087        }
088
089}