| /** |
| * 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.ext; |
| |
| import org.apache.commons.lang.text.StrLookup; |
| import org.slf4j.MDC; |
| |
| /** |
| * This class can be used with the Commons Lang StrSubstitutor to replace |
| * tokens that occur in Strings with their values in the MDC. |
| * |
| * @author Ralph Goers |
| */ |
| public class MDCStrLookup extends StrLookup { |
| /** |
| * Looks up up a value in the MDC. |
| * |
| * @param key the key to be looked up, may be null |
| * @return the matching value, null if no match |
| */ |
| public String lookup(String key) { |
| if (key == null) { |
| return null; |
| } |
| return MDC.get(key); |
| } |
| } |