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There is a newer version: 2.1.0-alpha1

package org.slf4j.helpers;

import org.slf4j.ILoggerFactory;
import org.slf4j.IMarkerFactory;
import org.slf4j.spi.MDCAdapter;
import org.slf4j.spi.SLF4JServiceProvider;

public class NOP_FallbackServiceProvider implements SLF4JServiceProvider {

    /**
     * Declare the version of the SLF4J API this implementation is compiled
     * against. The value of this field is modified with each major release.
     */
    // to avoid constant folding by the compiler, this field must *not* be final
    public static String REQUESTED_API_VERSION = "2.0.99"; // !final

    private final ILoggerFactory loggerFactory = new NOPLoggerFactory();
    private final IMarkerFactory markerFactory = new BasicMarkerFactory();
    private final MDCAdapter mdcAdapter = new NOPMDCAdapter();


    @Override
    public ILoggerFactory getLoggerFactory() {
        return loggerFactory;
    }

    @Override
    public IMarkerFactory getMarkerFactory() {
        return markerFactory;
    }


    @Override
    public MDCAdapter getMDCAdapter() {
        return mdcAdapter;
    }

    @Override
    public String getRequestedApiVersion() {
        return REQUESTED_API_VERSION;
    }

    @Override
    public void initialize() {
        // already initialized
    }
}