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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.Constructor;
import java.util.Arrays;

import static com.javonet.utils.HandlerUtils.getArgumentTypes;

public class CreateInstanceHandler extends AbstractHandler {
    private final int requiredArgumentsCount = 1;

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

        Class objectClass = (Class) command.getPayload()[0];
        if (command.getPayload().length == 1) {
            return objectClass.newInstance();
        } else {
            Object[] arguments = Arrays.stream(command.getPayload()).skip(1).toArray();
            Class[] argumentTypes = getArgumentTypes(arguments);
            try{
            Constructor constructor = objectClass.getConstructor(argumentTypes);
            return constructor.newInstance(arguments);
            }
            catch (NoSuchMethodException e) {
                Constructor[] constructors = objectClass.getConstructors();
                StringBuilder message = new StringBuilder("Constructor with arguments " + Arrays.toString(argumentTypes) + " not found in class " + objectClass.getName() + ". Available constructors:\n");
                for (Constructor constructor : constructors) {
                    message.append(constructor.getName()).append(" with arguments ").append(Arrays.toString(constructor.getParameterTypes())).append("\n");
                }
                throw new NoSuchMethodException(message.toString());
            }
        }
    }
}