NDC xref

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    1   /*
    2    * Copyright 2001-2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package org.apache.log4j;
    18
    19  import org.slf4j.MDC;
    20
    21  import java.util.Stack;
    22
    23  /**
    24   * A log4j's NDC implemented in terms of SLF4J MDC primitives.
    25   *
    26   * @since SLF4J 1.6.0
    27   */
    28
    29  public class NDC {
    30
    31    public final static String PREFIX = "NDC";
    32
    33    public static void clear() {
    34      int depth = getDepth();
    35      for (int i = 0; i < depth; i++) {
    36        String key = PREFIX + i;
    37        MDC.remove(key);
    38      }
    39    }
    40
    41    public static Stack cloneStack() {
    42      return null;
    43    }
    44
    45    public static void inherit(Stack stack) {
    46    }
    47
    48    static public String get() {
    49      return null;
    50    }
    51
    52    public static int getDepth() {
    53      int i = 0;
    54      while (true) {
    55        String val = MDC.get(PREFIX + i);
    56        if (val != null) {
    57          i++;
    58        } else {
    59          break;
    60        }
    61      }
    62      return i;
    63    }
    64
    65    public static String pop() {
    66      int next = getDepth();
    67      if (next == 0) {
    68        return "";
    69      }
    70      int last = next - 1;
    71      String key = PREFIX + last;
    72      String val = MDC.get(key);
    73      MDC.remove(key);
    74      return val;
    75    }
    76
    77    public static String peek() {
    78      int next = getDepth();
    79      if (next == 0) {
    80        return "";
    81      }
    82      int last = next - 1;
    83      String key = PREFIX + last;
    84      String val = MDC.get(key);
    85      return val;
    86    }
    87
    88    public static void push(String message) {
    89      int next = getDepth();
    90      MDC.put(PREFIX + next, message);
    91    }
    92
    93    static public void remove() {
    94      clear();
    95    }
    96
    97    static public void setMaxDepth(int maxDepth) {
    98    }
    99
    100 }