StaticLoggerBinder 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 org.slf4j.ILoggerFactory;
    28  import org.slf4j.LoggerFactory;
    29  import org.slf4j.spi.LoggerFactoryBinder;
    30
    31  /**
    32   * The binding of {@link LoggerFactory} class with an actual instance of
    33   * {@link ILoggerFactory} is performed using information returned by this class.
    34   *
    35   * @author Ceki G&uuml;lc&uuml;
    36   */
    37  public class StaticLoggerBinder implements LoggerFactoryBinder {
    38
    39    /**
    40     * The unique instance of this class.
    41     */
    42    private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
    43
    44    /**
    45     * Return the singleton of this class.
    46     *
    47     * @return the StaticLoggerBinder singleton
    48     */
    49    public static final StaticLoggerBinder getSingleton() {
    50      return SINGLETON;
    51    }
    52
    53    /**
    54     * Version tag used to check compatibility. The value of this field is
    55     * modified with each release.
    56     */
    57
    58    //to avoid constant folding by the compiler, this field must *not* be final
    59    public static String REQUESTED_API_VERSION = "1.6.99";
    60
    61    // Binding specific code:
    62    private static final String loggerFactoryClassStr = JCLLoggerFactory.class
    63        .getName();
    64
    65    /**
    66     * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
    67     * method should always be the same object
    68     */
    69    private final ILoggerFactory loggerFactory;
    70
    71    private StaticLoggerBinder() {
    72      // Binding specific code:
    73      loggerFactory = new JCLLoggerFactory();
    74    }
    75
    76    public ILoggerFactory getLoggerFactory() {
    77      return loggerFactory;
    78    }
    79
    80    public String getLoggerFactoryClassStr() {
    81      return loggerFactoryClassStr;
    82    }
    83  }