com.javonet.core.handler.InvokeGenericMethodHandler Maven / Gradle / Ivy

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Javonet allows you to reference and use modules or packages written in (Java/Kotlin/Groovy/Clojure, C#/VB.NET, Ruby, Perl, Python, JavaScript/TypeScript) like they were created in your technology. It works on Linux/Windows and MacOS for applications created in JVM, CLR/Netcore, Perl, Python, Ruby, NodeJS, C++ or GoLang and gives you unparalleled freedom and flexibility with native performance in building your mixed-technologies products. Let it be accessing best AI or cryptography libraries, devices SDKs, legacy client modules, internal custom packages or anything from public repositories available on NPM, Nuget, PyPI, Maven/Gradle, RubyGems or GitHub. Get free from programming languages barriers today! For more information check out our guides at https://www.javonet.com/guides/v2/

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package com.javonet.core.handler;

import com.javonet.utils.Command;
import com.javonet.utils.exceptions.JavonetArgumentsMismatchException;

import java.lang.reflect.Method;
import java.util.Arrays;

public class InvokeGenericMethodHandler extends AbstractHandler {
    private final int requiredArgumentsCount = 2;

    @Override
    public Object process(Command command) throws Exception {
        if (command.getPayload().length < requiredArgumentsCount)
            throw new JavonetArgumentsMismatchException(this.getClass().getName(), requiredArgumentsCount);

        Method foundMethod;
        Object objectClass = command.getPayload()[0];
        String methodToInvoke = command.getPayload()[1].toString();

        Object[] arguments = Arrays.stream(command.getPayload()).skip(2).toArray();
        Class[] parameterTypes = new Class[arguments.length];
        Arrays.fill(parameterTypes, Object.class);
        try{
        foundMethod = objectClass.getClass().getMethod(methodToInvoke, parameterTypes);
        }
        catch (NoSuchMethodException e) {
            Method[] methods = objectClass.getClass().getMethods();
            StringBuilder message = new StringBuilder("Method " + methodToInvoke + " with arguments " + Arrays.toString(parameterTypes) + " not found in class " + objectClass.getClass().getName() + ". Available methods:\n");
            for (Method method : methods) {
                message.append(method.getName()).append(" with arguments ").append(Arrays.toString(method.getParameterTypes())).append("\n");
            }
            throw new NoSuchMethodException(message.toString());
        } 
        return foundMethod.invoke(objectClass, arguments);
    }
}