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See http://www.slf4j.org/ Javadocs for the Log4jLoggerAdapter are available at http://www.slf4j.org/api/org/slf4j/impl/Log4jLoggerAdapter.html

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/*
 * Copyright (c) 2004-2005 SLF4J.ORG
 * Copyright (c) 2004-2005 QOS.ch
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package org.slf4j.spi;

import org.slf4j.ILoggerFactory;

/**
 * An internal interface which helps the static {@link org.slf4j.LoggerFactory} 
 * class bind with the appropriate {@link ILoggerFactory} instance. 
 * 
 * @author Ceki Gülcü
 */
public interface LoggerFactoryBinder {

  /**
   * Return the instance of {@link ILoggerFactory} that 
   * {@link org.slf4j.LoggerFactory} class should bind to.
   * 
   * @return the instance of {@link ILoggerFactory} that 
   * {@link org.slf4j.LoggerFactory} class should bind to.
   */
  public ILoggerFactory getLoggerFactory();

  /**
   * The String form of the {@link ILoggerFactory} object that this 
   * LoggerFactoryBinder instance is intended to return. 
   * 
   * This method allows the developer to intterogate this binder's intention 
   * which may be different from the {@link ILoggerFactory} instance it is able to 
   * yield in practice. The discrepency should only occur in case of errors.
   * 
   * @return the class name of the intended {@link ILoggerFactory} instance
   */
  public String getLoggerFactoryClassStr();
}