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Fastjson is a JSON processor (JSON parser + JSON generator) written in Java

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package com.alibaba.fastjson2.reader;

import com.alibaba.fastjson2.JSONReader;

import java.lang.reflect.Type;
import java.util.function.Function;

public final class ObjectReaderImplFromString
        extends ObjectReaderPrimitive {
    final Function creator;

    public ObjectReaderImplFromString(Class objectClass, Function creator) {
        super(objectClass);
        this.creator = creator;
    }

    @Override
    public T readJSONBObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
        String str = jsonReader.readString();
        if (str == null || str.isEmpty()) {
            return null;
        }

        return creator.apply(str);
    }

    @Override
    public T readObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
        String str = jsonReader.readString();
        if (str == null) {
            return null;
        }

        return creator.apply(str);
    }
}