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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     @SuppressWarnings("rawtypes")
     42     public static Stack cloneStack() {
     43         return null;
     44     }
     45 
     46     @SuppressWarnings("rawtypes")
     47     public static void inherit(Stack stack) {
     48     }
     49 
     50     static public String get() {
     51         return null;
     52     }
     53 
     54     public static int getDepth() {
     55         int i = 0;
     56         while (true) {
     57             String val = MDC.get(PREFIX + i);
     58             if (val != null) {
     59                 i++;
     60             } else {
     61                 break;
     62             }
     63         }
     64         return i;
     65     }
     66 
     67     public static String pop() {
     68         int next = getDepth();
     69         if (next == 0) {
     70             return "";
     71         }
     72         int last = next - 1;
     73         String key = PREFIX + last;
     74         String val = MDC.get(key);
     75         MDC.remove(key);
     76         return val;
     77     }
     78 
     79     public static String peek() {
     80         int next = getDepth();
     81         if (next == 0) {
     82             return "";
     83         }
     84         int last = next - 1;
     85         String key = PREFIX + last;
     86         String val = MDC.get(key);
     87         return val;
     88     }
     89 
     90     public static void push(String message) {
     91         int next = getDepth();
     92         MDC.put(PREFIX + next, message);
     93     }
     94 
     95     static public void remove() {
     96         clear();
     97     }
     98 
     99     static public void setMaxDepth(int maxDepth) {
    100     }
    101 
    102 }
    103