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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements. See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache license, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License. You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the license for the specific language governing permissions and
    15   * limitations under the license.
    16   */
    17  package org.slf4j.impl;
    18
    19  import org.apache.logging.slf4j.Log4jLoggerFactory;
    20  import org.slf4j.ILoggerFactory;
    21  import org.slf4j.spi.LoggerFactoryBinder;
    22
    23  /**
    24   * SLF4J LoggerFactoryBinder implementation using Log4j. This class is part of the required classes used to specify an
    25   * SLF4J logger provider implementation.
    26   */
    27  public final class StaticLoggerBinder implements LoggerFactoryBinder {
    28
    29      /**
    30       * Declare the version of the SLF4J API this implementation is compiled
    31       * against. The value of this field is usually modified with each release.
    32       */
    33      // to avoid constant folding by the compiler, this field must *not* be final
    34      public static String REQUESTED_API_VERSION = "1.6"; // !final
    35
    36      private static final String LOGGER_FACTORY_CLASS_STR = Log4jLoggerFactory.class.getName();
    37
    38      /**
    39       * The unique instance of this class.
    40       */
    41      private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
    42
    43      /**
    44       * The ILoggerFactory instance returned by the {@link #getLoggerFactory}
    45       * method should always be the same object
    46       */
    47      private final ILoggerFactory loggerFactory;
    48
    49      /**
    50       * Private constructor to prevent instantiation
    51       */
    52      private StaticLoggerBinder() {
    53          loggerFactory = new Log4jLoggerFactory();
    54      }
    55
    56      /**
    57       * Returns the singleton of this class.
    58       *
    59       * @return the StaticLoggerBinder singleton
    60       */
    61      public static StaticLoggerBinder getSingleton() {
    62          return SINGLETON;
    63      }
    64
    65      /**
    66       * Returns the factory.
    67       * @return the factor.
    68       */
    69      @Override
    70      public ILoggerFactory getLoggerFactory() {
    71          return loggerFactory;
    72      }
    73
    74      /**
    75       * Returns the class name.
    76       * @return the class name;
    77       */
    78      @Override
    79      public String getLoggerFactoryClassStr() {
    80          return LOGGER_FACTORY_CLASS_STR;
    81      }
    82  }