package org.yeshi.utils;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.springframework.core.DefaultParameterNameDiscoverer;
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import org.springframework.expression.EvaluationContext;
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import org.springframework.expression.Expression;
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import org.springframework.expression.ExpressionParser;
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import org.springframework.expression.spel.standard.SpelExpressionParser;
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import org.springframework.expression.spel.support.StandardEvaluationContext;
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public class SPELExpressionUtil {
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private static ExpressionParser parser = new SpelExpressionParser();
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public static String generateKeyBySpEL(String spELString, ProceedingJoinPoint joinPoint) {
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DefaultParameterNameDiscoverer nameDiscoverer = new DefaultParameterNameDiscoverer();
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MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
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String[] paramNames = nameDiscoverer.getParameterNames(methodSignature.getMethod());
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Expression expression = parser.parseExpression(spELString);
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EvaluationContext context = new StandardEvaluationContext();
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Object[] args = joinPoint.getArgs();
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for (int i = 0; i < args.length; i++) {
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context.setVariable(paramNames[i], args[i]);
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}
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return expression.getValue(context).toString();
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}
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}
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