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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.helpers.NOPLoggerFactory;
     30 import org.slf4j.spi.LoggerFactoryBinder;
     31 
     32 /**
     33  * The binding of {@link LoggerFactory} class with an actual instance of
     34  * {@link ILoggerFactory} is performed using information returned by this class.
     35  *
     36  * @author Ceki Gülcü
     37  */
     38 public class StaticLoggerBinder implements LoggerFactoryBinder {
     39 
     40     /**
     41      * The unique instance of this class.
     42      *
     43      */
     44     private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
     45 
     46     /**
     47      * Return the singleton of this class.
     48      *
     49      * @return the StaticLoggerBinder singleton
     50      */
     51     public static final StaticLoggerBinder getSingleton() {
     52         return SINGLETON;
     53     }
     54 
     55     /**
     56      * Declare the version of the SLF4J API this implementation is compiled against.
     57      * The value of this field is usually modified with each release.
     58      */
     59     // to avoid constant folding by the compiler, this field must *not* be final
     60     public static String REQUESTED_API_VERSION = "1.6.99"; // !final
     61 
     62     private static final String loggerFactoryClassStr = NOPLoggerFactory.class.getName();
     63 
     64     /** The ILoggerFactory instance returned by the {@link #getLoggerFactory} method
     65      * should always be the same object
     66      */
     67     private final ILoggerFactory loggerFactory;
     68 
     69     private StaticLoggerBinder() {
     70         loggerFactory = new NOPLoggerFactory();
     71     }
     72 
     73     public ILoggerFactory getLoggerFactory() {
     74         return loggerFactory;
     75     }
     76 
     77     public String getLoggerFactoryClassStr() {
     78         return loggerFactoryClassStr;
     79     }
     80 }
     81