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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.logging.slf4j;
    18
    19  import java.util.Map;
    20
    21  import org.apache.logging.log4j.spi.ThreadContextMap;
    22  import org.slf4j.MDC;
    23
    24  /**
    25   * Bind the ThreadContextMap to the SLF4J MDC.
    26   */
    27  public class MDCContextMap implements ThreadContextMap {
    28      @Override
    29      public void put(final String key, final String value) {
    30          MDC.put(key, value);
    31      }
    32
    33      @Override
    34      public String get(final String key) {
    35          return MDC.get(key);
    36      }
    37
    38      @Override
    39      public void remove(final String key) {
    40          MDC.remove(key);
    41      }
    42
    43      @Override
    44      public void clear() {
    45          MDC.clear();
    46      }
    47
    48      @Override
    49      public boolean containsKey(final String key) {
    50          return MDC.getCopyOfContextMap().containsKey(key);
    51      }
    52
    53      @Override
    54      @SuppressWarnings("unchecked") // nothing we can do about this, restricted by SLF4J API
    55      public Map<String, String> getCopy() {
    56          return MDC.getCopyOfContextMap();
    57      }
    58
    59      @Override
    60      @SuppressWarnings("unchecked") // nothing we can do about this, restricted by SLF4J API
    61      public Map<String, String> getImmutableMapOrNull() {
    62          return MDC.getCopyOfContextMap();
    63      }
    64
    65      @Override
    66      public boolean isEmpty() {
    67          return MDC.getCopyOfContextMap().isEmpty();
    68      }
    69  }