package cn.besteam.common.util;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.context.expression.MethodBasedEvaluationContext;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;

import java.lang.reflect.Method;

/**
 * @author chenqilong
 * @since 2019-05-21
 */
public class SpringUtil {

    private static final ParameterNameDiscoverer NAME_DISCOVERER = new DefaultParameterNameDiscoverer();

    private static final ExpressionParser PARSER = new SpelExpressionParser();

    public static String getSpelValue(ProceedingJoinPoint joinPoint, String definitionKey) {

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        return getSpelValue(definitionKey, method, joinPoint.getArgs());
    }

    public static String getSpelValue(String definitionKey, Method method, Object[] parameterValues) {

        EvaluationContext context = new MethodBasedEvaluationContext(null, method, parameterValues, NAME_DISCOVERER);
        String val = PARSER.parseExpression(definitionKey).getValue(context).toString();
        return val;
    }

}