| /** |
| * Copyright (c) 2004-2011 QOS.ch |
| * All rights reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| */ |
| package org.slf4j; |
| |
| public class NDC { |
| public final static String PREFIX = "NDC"; |
| |
| private static int size() { |
| int i = 0; |
| while (true) { |
| String val = MDC.get(PREFIX + i); |
| if (val != null) { |
| i++; |
| } else { |
| break; |
| } |
| } |
| return i; |
| } |
| |
| public static void push(String val) { |
| int next = size(); |
| MDC.put(PREFIX + next, val); |
| } |
| |
| public static String pop() { |
| int next = size(); |
| if (next == 0) { |
| return ""; |
| } |
| int last = next - 1; |
| String key = PREFIX + last; |
| String val = MDC.get(key); |
| MDC.remove(key); |
| return val; |
| } |
| |
| } |