org.slf4j.helpers.SubstituteLoggerFactory Maven / Gradle / Ivy

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 * Copyright (c) 2004-2005 QOS.ch
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package org.slf4j.helpers;

import java.util.ArrayList;
import java.util.List;

import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;

/**
 * SubstituteLoggerFactory is an trivial implementation of
 * {@link ILoggerFactory} which always returns the unique instance of NOPLogger.
 * 
 * 
 * It used as a temporary substitute for the real ILoggerFactory during its
 * auto-configuration which may re-enter LoggerFactory to obtain logger
 * instances. See also http://bugzilla.slf4j.org/show_bug.cgi?id=106
 * 
 * @author Ceki Gülcü
 */
public class SubstituteLoggerFactory implements ILoggerFactory {

  // keep a record of requested logger names
  final List loggerNameList = new ArrayList();

  public Logger getLogger(String name) {
    synchronized (loggerNameList) {
      loggerNameList.add(name);
    }
    return NOPLogger.NOP_LOGGER;
  }

  public List getLoggerNameList() {
    List copy = new ArrayList();
    synchronized (loggerNameList) {
      copy.addAll(loggerNameList);
    }
    return copy;
  }

}