com.alibaba.qlexpress4.runtime.data.lambda.QLambdaMethod Maven / Gradle / Ivy

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package com.alibaba.qlexpress4.runtime.data.lambda;

import com.alibaba.qlexpress4.exception.UserDefineException;
import com.alibaba.qlexpress4.member.MethodHandler;
import com.alibaba.qlexpress4.runtime.IMethod;
import com.alibaba.qlexpress4.runtime.QLambda;
import com.alibaba.qlexpress4.runtime.QResult;
import com.alibaba.qlexpress4.runtime.ReflectLoader;
import com.alibaba.qlexpress4.runtime.data.DataValue;
import com.alibaba.qlexpress4.runtime.data.convert.ParametersTypeConvertor;
import com.alibaba.qlexpress4.utils.BasicUtil;

import java.util.Arrays;

/**
 * Author: TaoKan
 */
public class QLambdaMethod implements QLambda {

    private final String methodName;
    private final ReflectLoader reflectLoader;
    private final Object bean;

    public QLambdaMethod(String methodName, ReflectLoader reflectLoader, Object obj) {
        this.methodName = methodName;
        this.reflectLoader = reflectLoader;
        this.bean = obj;
    }

    @Override
    public QResult call(Object... params) throws Exception {
        Class[] type = BasicUtil.getTypeOfObject(params);
        IMethod method = reflectLoader.loadMethod(bean, methodName, type);
        if (method == null) {
            throw new UserDefineException(UserDefineException.ExceptionType.INVALID_ARGUMENT,
                    "method reference '" + methodName + "' not found for argument types " + Arrays.toString(type));
        }
        Object[] convertResult = ParametersTypeConvertor.cast(params, method.getParameterTypes(), method.isVarArgs());
        Object value = MethodHandler.Access.accessMethodValue(method, bean, convertResult);
        return new QResult(new DataValue(value), QResult.ResultType.RETURN);
    }
}