spring BshScriptEvaluator 源码
spring BshScriptEvaluator 代码
文件路径：/spring-context/src/main/java/org/springframework/scripting/bsh/BshScriptEvaluator.java
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.scripting.bsh;
import java.io.IOException;
import java.io.StringReader;
import java.util.Map;
import bsh.EvalError;
import bsh.Interpreter;
import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.lang.Nullable;
import org.springframework.scripting.ScriptCompilationException;
import org.springframework.scripting.ScriptEvaluator;
import org.springframework.scripting.ScriptSource;
/**
* BeanShell-based implementation of Spring's {@link ScriptEvaluator} strategy interface.
*
* @author Juergen Hoeller
* @since 4.0
* @see Interpreter#eval(String)
*/
public class BshScriptEvaluator implements ScriptEvaluator, BeanClassLoaderAware {
@Nullable
private ClassLoader classLoader;
/**
* Construct a new BshScriptEvaluator.
*/
public BshScriptEvaluator() {
}
/**
* Construct a new BshScriptEvaluator.
* @param classLoader the ClassLoader to use for the {@link Interpreter}
*/
public BshScriptEvaluator(ClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
public void setBeanClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
@Nullable
public Object evaluate(ScriptSource script) {
return evaluate(script, null);
}
@Override
@Nullable
public Object evaluate(ScriptSource script, @Nullable Map<String, Object> arguments) {
try {
Interpreter interpreter = new Interpreter();
interpreter.setClassLoader(this.classLoader);
if (arguments != null) {
for (Map.Entry<String, Object> entry : arguments.entrySet()) {
interpreter.set(entry.getKey(), entry.getValue());
}
}
return interpreter.eval(new StringReader(script.getScriptAsString()));
}
catch (IOException ex) {
throw new ScriptCompilationException(script, "Cannot access BeanShell script", ex);
}
catch (EvalError ex) {
throw new ScriptCompilationException(script, ex);
}
}
}
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