com.fasterxml.jackson.module.noctordeser.util.ReflectionUtil Maven / Gradle / Ivy

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Support deserialization of POJO classes without default constructor

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package com.fasterxml.jackson.module.noctordeser.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;

import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.util.ClassUtil;
import com.fasterxml.jackson.databind.util.LRUMap;

import sun.reflect.ReflectionFactory;

@SuppressWarnings("restriction")
public class ReflectionUtil
{
    // Limit max number of generated Constructors cached
    private final LRUMap, Constructor> constructorCache = new LRUMap<>(20, 100);

    public Object newConstructorAndCreateInstance(DeserializationContext ctxt,
            Class classToInstantiate)
        throws JacksonException
    {
        if (classToInstantiate.isInterface() || Modifier.isAbstract(classToInstantiate.getModifiers())) {
            return null;
        }
        Constructor constructor = constructorCache.get(classToInstantiate);
        try {
            if (constructor == null) {
                constructor = ReflectionFactory.getReflectionFactory()
                        .newConstructorForSerialization(classToInstantiate, Object.class.getDeclaredConstructor());
                constructor.setAccessible(true);
                constructorCache.put(classToInstantiate, constructor);
            }
        } catch (Exception e) {
            return ctxt.reportBadDefinition(classToInstantiate,
"No-Constructor-Deserialization module failed to force generation of virtual constructor: "
                    +e.getMessage());
        }
 
        try {
            return constructor.newInstance();
        } catch (Exception e) {
            return ctxt.reportBadDefinition(classToInstantiate,
"No-Constructor-Deserialization module failed to forcibly instantiate "
+ClassUtil.nameOf(classToInstantiate)+": " +e.getMessage());
        }
    }
}