org.apache.log4j.NDC Maven / Gradle / Ivy
/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j;
import org.slf4j.MDC;
import java.util.Stack;
/**
* A log4j's NDC implemented in terms of SLF4J MDC primitives.
*
* @since SLF4J 1.6.0
*/
public class NDC {
public final static String PREFIX = "NDC";
public static void clear() {
int depth = getDepth();
for (int i = 0; i < depth; i++) {
String key = PREFIX + i;
MDC.remove(key);
}
}
public static Stack cloneStack() {
return null;
}
public static void inherit(Stack stack) {
}
static public String get() {
return null;
}
public static int getDepth() {
int i = 0;
while (true) {
String val = MDC.get(PREFIX + i);
if (val != null) {
i++;
} else {
break;
}
}
return i;
}
public static String pop() {
int next = getDepth();
if (next == 0) {
return "";
}
int last = next - 1;
String key = PREFIX + last;
String val = MDC.get(key);
MDC.remove(key);
return val;
}
public static String peek() {
int next = getDepth();
if (next == 0) {
return "";
}
int last = next - 1;
String key = PREFIX + last;
String val = MDC.get(key);
return val;
}
public static void push(String message) {
int next = getDepth();
MDC.put(PREFIX + next, message);
}
static public void remove() {
clear();
}
static public void setMaxDepth(int maxDepth) {
}
}