Log4jLoggerFactory xref

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    1   /**
    2    * Copyright (c) 2004-2011 QOS.ch
    3    * All rights reserved.
    4    *
    5    * Permission is hereby granted, free  of charge, to any person obtaining
    6    * a  copy  of this  software  and  associated  documentation files  (the
    7    * "Software"), to  deal in  the Software without  restriction, including
    8    * without limitation  the rights to  use, copy, modify,  merge, publish,
    9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
    10   * permit persons to whom the Software  is furnished to do so, subject to
    11   * the following conditions:
    12   *
    13   * The  above  copyright  notice  and  this permission  notice  shall  be
    14   * included in all copies or substantial portions of the Software.
    15   *
    16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
    17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
    18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
    19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
    22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23   *
    24   */
    25  package org.slf4j.impl;
    26
    27  import java.util.HashMap;
    28  import java.util.Map;
    29
    30  import org.apache.log4j.LogManager;
    31  import org.slf4j.ILoggerFactory;
    32  import org.slf4j.Logger;
    33
    34  /**
    35   * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning
    36   * the appropriate named {@link Log4jLoggerAdapter} instance.
    37   *
    38   * @author Ceki G&uuml;lc&uuml;
    39   */
    40  public class Log4jLoggerFactory implements ILoggerFactory {
    41
    42    // key: name (String), value: a Log4jLoggerAdapter;
    43    Map loggerMap;
    44
    45    public Log4jLoggerFactory() {
    46      loggerMap = new HashMap();
    47    }
    48
    49    /*
    50     * (non-Javadoc)
    51     *
    52     * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
    53     */
    54    public Logger getLogger(String name) {
    55      Logger slf4jLogger = null;
    56      // protect against concurrent access of loggerMap
    57      synchronized (this) {
    58          slf4jLogger = (Logger) loggerMap.get(name);
    59        if (slf4jLogger == null) {
    60          org.apache.log4j.Logger log4jLogger;
    61          if(name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) {
    62             log4jLogger = LogManager.getRootLogger();
    63          } else {
    64            log4jLogger = LogManager.getLogger(name);
    65          }
    66          slf4jLogger = new Log4jLoggerAdapter(log4jLogger);
    67          loggerMap.put(name, slf4jLogger);
    68        }
    69      }
    70      return slf4jLogger;
    71    }
    72  }