001/* 002 * Copyright 2002-2017 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.lang.Nullable; 028import org.springframework.scripting.ScriptCompilationException; 029import org.springframework.scripting.ScriptEvaluator; 030import org.springframework.scripting.ScriptSource; 031 032/** 033 * BeanShell-based implementation of Spring's {@link ScriptEvaluator} strategy interface. 034 * 035 * @author Juergen Hoeller 036 * @since 4.0 037 * @see Interpreter#eval(String) 038 */ 039public class BshScriptEvaluator implements ScriptEvaluator, BeanClassLoaderAware { 040 041 @Nullable 042 private ClassLoader classLoader; 043 044 045 /** 046 * Construct a new BshScriptEvaluator. 047 */ 048 public BshScriptEvaluator() { 049 } 050 051 /** 052 * Construct a new BshScriptEvaluator. 053 * @param classLoader the ClassLoader to use for the {@link Interpreter} 054 */ 055 public BshScriptEvaluator(ClassLoader classLoader) { 056 this.classLoader = classLoader; 057 } 058 059 060 @Override 061 public void setBeanClassLoader(ClassLoader classLoader) { 062 this.classLoader = classLoader; 063 } 064 065 066 @Override 067 @Nullable 068 public Object evaluate(ScriptSource script) { 069 return evaluate(script, null); 070 } 071 072 @Override 073 @Nullable 074 public Object evaluate(ScriptSource script, @Nullable Map<String, Object> arguments) { 075 try { 076 Interpreter interpreter = new Interpreter(); 077 interpreter.setClassLoader(this.classLoader); 078 if (arguments != null) { 079 for (Map.Entry<String, Object> entry : arguments.entrySet()) { 080 interpreter.set(entry.getKey(), entry.getValue()); 081 } 082 } 083 return interpreter.eval(new StringReader(script.getScriptAsString())); 084 } 085 catch (IOException ex) { 086 throw new ScriptCompilationException(script, "Cannot access BeanShell script", ex); 087 } 088 catch (EvalError ex) { 089 throw new ScriptCompilationException(script, ex); 090 } 091 } 092 093}