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Java api library to access nextcloud features from java applications

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package org.aarboard.nextcloud.api.utils;

import jakarta.xml.bind.JAXBContext;
import jakarta.xml.bind.JAXBException;
import jakarta.xml.bind.Unmarshaller;
import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
import org.aarboard.nextcloud.api.exception.NextcloudApiException;
import org.aarboard.nextcloud.api.utils.ConnectorCommon.ResponseParser;

public class XMLAnswerParser implements ResponseParser
{
    private static final Map> PARSERS = new HashMap<>();

    private final JAXBContext jAXBContext;

    public XMLAnswerParser(Class answerClass)
    {
        try {
            jAXBContext = JAXBContext.newInstance(XMLAnswer.class, answerClass);
        } catch (JAXBException e) {
            throw new NextcloudApiException(e);
        }
    }

    public static  XMLAnswerParser getInstance(Class answerClass)
    {
        @SuppressWarnings("unchecked")
        XMLAnswerParser parser = (XMLAnswerParser) PARSERS.get(answerClass.getName());
        if (parser == null)
        {
            synchronized (PARSERS)
            {
              parser = new XMLAnswerParser<>(answerClass);
              PARSERS.put(answerClass.getName(), parser);
            }
        }
        return parser;
    }

    @Override
    public A parseResponse(Reader xmlStream)
    {
        try {
            return tryParseAnswer(xmlStream);
        } catch (Exception e) {
            throw new NextcloudApiException(e);
        } finally {
            try {
                xmlStream.close();
            } catch (IOException e) {
                // Ignore
            }
        }
    }

    @SuppressWarnings("unchecked")
    private A tryParseAnswer(Reader xmlStream) throws JAXBException {
        Unmarshaller unmarshaller = jAXBContext.createUnmarshaller();
        Object result = unmarshaller.unmarshal(xmlStream);
        return (A) result;
    }
}

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