StaticLoggerBinder.java

package org.slf4j.impl;

import org.slf4j.ILoggerFactory;
import org.slf4j.LoggerFactory;
import org.slf4j.spi.LoggerFactoryBinder;

/**
 * The binding of {@link LoggerFactory} class with an actual instance of
 * {@link ILoggerFactory} is performed using information returned by this class.
 *
 * @author Ceki Gülcü
 * @author Andrey Korzhevskiy <a.korzhevskiy@gmail.com>
 */
public class StaticLoggerBinder implements LoggerFactoryBinder {

    /**
     * The unique instance of this class.
     */
    private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();

    /**
     * Return the singleton of this class.
     *
     * @return the StaticLoggerBinder singleton
     */
    public static StaticLoggerBinder getSingleton() {
        return SINGLETON;
    }

    /**
     * Declare the version of the SLF4J API this implementation is compiled against.
     * The value of this field is usually modified with each release.
     */
    // to avoid constant folding by the compiler, this field must *not* be final

    public static String REQUESTED_API_VERSION = "1.7.12";  // !final


    private static final String loggerFactoryClassStr = SystemOutLoggerFactory.class.getName();

    /**
     * The ILoggerFactory instance returned by the {@link #getLoggerFactory} method
     * should always be the same object
     */
    private final ILoggerFactory loggerFactory;

    private StaticLoggerBinder() {
        loggerFactory = new SystemOutLoggerFactory();
    }

    public ILoggerFactory getLoggerFactory() {
        return loggerFactory;
    }

    public String getLoggerFactoryClassStr() {
        return loggerFactoryClassStr;
    }
}