log4j-slf4j-impl/src/main/java/org/apache/logging/slf4j/Log4jLoggerFactory.java [33:69]:
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public class Log4jLoggerFactory extends AbstractLoggerAdapter<Logger> implements ILoggerFactory {

    private static final StatusLogger LOGGER = StatusLogger.getLogger();
    private static final String SLF4J_PACKAGE = "org.slf4j";
    private static final Predicate<Class<?>> CALLER_PREDICATE = clazz ->
            !AbstractLoggerAdapter.class.equals(clazz) && !clazz.getName().startsWith(SLF4J_PACKAGE);
    private static final String TO_SLF4J_CONTEXT = "org.apache.logging.slf4j.SLF4JLoggerContext";

    private final Log4jMarkerFactory markerFactory;

    public Log4jLoggerFactory(final Log4jMarkerFactory markerFactory) {
        this.markerFactory = markerFactory;
    }

    @Override
    protected Logger newLogger(final String name, final LoggerContext context) {
        final String key = Logger.ROOT_LOGGER_NAME.equals(name) ? LogManager.ROOT_LOGGER_NAME : name;
        return new Log4jLogger(markerFactory, validateContext(context).getLogger(key), name);
    }

    @Override
    protected LoggerContext getContext() {
        final Class<?> anchor = LogManager.getFactory().isClassLoaderDependent()
                ? StackLocatorUtil.getCallerClass(Log4jLoggerFactory.class, CALLER_PREDICATE)
                : null;
        LOGGER.trace("Log4jLoggerFactory.getContext() found anchor {}", anchor);
        return anchor == null
                ? LogManager.getContext(false)
                : getContext(anchor);
    }

    Log4jMarkerFactory getMarkerFactory() {
        return markerFactory;
    }

    private LoggerContext validateContext(final LoggerContext context) {
        if (TO_SLF4J_CONTEXT.equals(context.getClass().getName())) {
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log4j-slf4j2-impl/src/main/java/org/apache/logging/slf4j/Log4jLoggerFactory.java [33:69]:
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public class Log4jLoggerFactory extends AbstractLoggerAdapter<Logger> implements ILoggerFactory {

    private static final StatusLogger LOGGER = StatusLogger.getLogger();
    private static final String SLF4J_PACKAGE = "org.slf4j";
    private static final Predicate<Class<?>> CALLER_PREDICATE = clazz ->
            !AbstractLoggerAdapter.class.equals(clazz) && !clazz.getName().startsWith(SLF4J_PACKAGE);
    private static final String TO_SLF4J_CONTEXT = "org.apache.logging.slf4j.SLF4JLoggerContext";

    private final Log4jMarkerFactory markerFactory;

    public Log4jLoggerFactory(final Log4jMarkerFactory markerFactory) {
        this.markerFactory = markerFactory;
    }

    @Override
    protected Logger newLogger(final String name, final LoggerContext context) {
        final String key = Logger.ROOT_LOGGER_NAME.equals(name) ? LogManager.ROOT_LOGGER_NAME : name;
        return new Log4jLogger(markerFactory, validateContext(context).getLogger(key), name);
    }

    @Override
    protected LoggerContext getContext() {
        final Class<?> anchor = LogManager.getFactory().isClassLoaderDependent()
                ? StackLocatorUtil.getCallerClass(Log4jLoggerFactory.class, CALLER_PREDICATE)
                : null;
        LOGGER.trace("Log4jLoggerFactory.getContext() found anchor {}", anchor);
        return anchor == null
                ? LogManager.getContext(false)
                : getContext(anchor);
    }

    Log4jMarkerFactory getMarkerFactory() {
        return markerFactory;
    }

    private LoggerContext validateContext(final LoggerContext context) {
        if (TO_SLF4J_CONTEXT.equals(context.getClass().getName())) {
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