com.javonet.core.handler.SetInstanceFieldHandler 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.Field;

public class SetInstanceFieldHandler extends AbstractHandler {
    private final int requiredArgumentsCount = 3;

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

        Object objectClass = command.getPayload()[0];
        String fieldString = command.getPayload()[1].toString();
        Object newValue = command.getPayload()[2];
        try{
        Field field = objectClass.getClass().getDeclaredField(fieldString);
        field.set(objectClass, newValue);
        }
        catch (NoSuchFieldException e) {
            Field[] fields = objectClass.getClass().getDeclaredFields();
            StringBuilder message = new StringBuilder("Field " + fieldString + " not found in class " + objectClass.getClass().getName() + ". Available fields:\n");
            for (Field field : fields) {
                message.append(field.getName()).append("\n");
            }
            throw new NoSuchFieldException(message.toString());
        }
        return 0;
    }
}