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Java utilities (logging)

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package com.dua3.utility.logging.slf4j;

import com.dua3.utility.logging.ILogEntryDispatcherFactory;
import com.dua3.utility.logging.LogEntryDispatcher;
import org.slf4j.ILoggerFactory;
import org.slf4j.LoggerFactory;

/**
 * This class is an implementation of the ILogEntryDispatcherFactory interface.
 * It provides the functionality to create a SLF4J LogEntryDispatcher instance.
 */
public class LogEntryDispatcherFactorySlf4j implements ILogEntryDispatcherFactory {

    private static class SingletonHolder {
        private static final LoggerFactorySlf4j INSTANCE = initInstance();

        private static LoggerFactorySlf4j initInstance() {
            ILoggerFactory iLoggerFactory = LoggerFactory.getILoggerFactory();
            if (iLoggerFactory instanceof LoggerFactorySlf4j loggerFactorySlf4j) {
                return loggerFactorySlf4j;
            } else {
                throw new IllegalStateException("unecpected factory type: " + iLoggerFactory.getClass());
            }
        }
    }

    /**
     * Retrieves the instance of the LoggerFactorySlf4j class, which is a singleton implementation of the ILoggerFactory interface and LogEntryDispatcher interface.
     *
     * @return The instance of the LoggerFactorySlf4j class.
     */
    public static LoggerFactorySlf4j getFactory() {
        return SingletonHolder.INSTANCE;
    }

    @Override
    public LogEntryDispatcher getDispatcher() {
        return getFactory();
    }
}