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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.apache.log4j.spi;
    18
    19  import org.apache.log4j.ULogger;
    20
    21
    22  /**
    23   * A no operation (NOP) implementation of {@link ULogger}.
    24   *
    25   * @author Ceki G&uuml;lc&uuml;
    26   */
    27  public final class NOPULogger implements ULogger {
    28
    29      /**
    30       * The unique instance of NOPLogger.
    31       */
    32      public static final NOPULogger NOP_LOGGER = new NOPULogger();
    33
    34      /**
    35       * There is no point in people creating multiple instances of NullLogger.
    36       * Hence, the private access modifier.
    37       */
    38      private NOPULogger() {
    39          super();
    40      }
    41
    42      /**
    43       * Get instance.
    44       * @param name logger name.
    45       * @return logger.
    46       */
    47      public static NOPULogger getLogger(final String name) {
    48          return NOP_LOGGER;
    49      }
    50
    51      /**
    52       * {@inheritDoc}
    53       */
    54      public boolean isDebugEnabled() {
    55          return false;
    56      }
    57
    58      /**
    59       * {@inheritDoc}
    60       */
    61      public void debug(final Object msg) {
    62          // NOP
    63      }
    64
    65      /**
    66       * {@inheritDoc}
    67       */
    68      public void debug(final Object parameterizedMsg, final Object param1) {
    69          // NOP
    70      }
    71
    72      /**
    73       * {@inheritDoc}
    74       */
    75      public void debug(final String parameterizedMsg,
    76                        final Object param1,
    77                        final Object param2) {
    78          // NOP
    79      }
    80
    81      /**
    82       * {@inheritDoc}
    83       */
    84      public void debug(final Object msg, final Throwable t) {
    85          // NOP
    86      }
    87
    88      /**
    89       * {@inheritDoc}
    90       */
    91      public boolean isInfoEnabled() {
    92          // NOP
    93          return false;
    94      }
    95
    96      /**
    97       * {@inheritDoc}
    98       */
    99      public void info(final Object msg) {
    100         // NOP
    101     }
    102
    103     /**
    104      * {@inheritDoc}
    105      */
    106     public void info(final Object parameterizedMsg, final Object param1) {
    107         // NOP
    108     }
    109
    110     /**
    111      * {@inheritDoc}
    112      */
    113     public void info(final String parameterizedMsg,
    114                      final Object param1, final Object param2) {
    115         // NOP
    116     }
    117
    118     /**
    119      * {@inheritDoc}
    120      */
    121     public void info(final Object msg, final Throwable t) {
    122         // NOP
    123     }
    124
    125     /**
    126      * {@inheritDoc}
    127      */
    128     public boolean isWarnEnabled() {
    129         return false;
    130     }
    131
    132     /**
    133      * {@inheritDoc}
    134      */
    135     public void warn(final Object msg) {
    136         // NOP
    137     }
    138
    139     /**
    140      * {@inheritDoc}
    141      */
    142     public void warn(final Object parameterizedMsg,
    143                      final Object param1) {
    144         // NOP
    145     }
    146
    147     /**
    148      * {@inheritDoc}
    149      */
    150     public void warn(final String parameterizedMsg,
    151                      final Object param1,
    152                      final Object param2) {
    153         // NOP
    154     }
    155
    156     /**
    157      * {@inheritDoc}
    158      */
    159     public void warn(final Object msg, final Throwable t) {
    160         // NOP
    161     }
    162
    163     /**
    164      * {@inheritDoc}
    165      */
    166     public boolean isErrorEnabled() {
    167         return false;
    168     }
    169
    170     /**
    171      * {@inheritDoc}
    172      */
    173     public void error(final Object msg) {
    174         // NOP
    175     }
    176
    177     /**
    178      * {@inheritDoc}
    179      */
    180     public void error(final Object parameterizedMsg, final Object param1) {
    181         // NOP
    182     }
    183
    184     /**
    185      * {@inheritDoc}
    186      */
    187     public void error(final String parameterizedMsg,
    188                       final Object param1,
    189                       final Object param2) {
    190         // NOP
    191     }
    192
    193     /**
    194      * {@inheritDoc}
    195      */
    196     public void error(final Object msg, final Throwable t) {
    197         // NOP
    198     }
    199
    200 }