/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.logging.jdk;
import java.util.ArrayList;
import java.util.EmptyStackException;
import org.jboss.logging.NDCProvider;
/**
* NDC implementation for JDK logging
*
* @author Jason T. Greene
*/
public class JDKNDCProvider implements NDCProvider
{
private class ArrayStack<E> extends ArrayList<E>
{
private static final long serialVersionUID = -8520038422243642840L;
public E pop()
{
int size = size();
if (size == 0)
throw new EmptyStackException();
return remove(size - 1);
}
public E peek()
{
int size = size();
if (size == 0)
throw new EmptyStackException();
return get(size - 1);
}
public void push(E val)
{
add(val);
}
public void setSize(int newSize)
{
int size = size();
if (newSize >= size || newSize < 0)
return;
removeRange(newSize, size);
}
}
private class Entry
{
private String merged;
private String current;
public Entry(String current)
{
this.merged = current;
this.current = current;
}
public Entry(Entry parent, String current)
{
this.merged = parent.merged + ' ' + current;
this.current = current;
}
}
private ThreadLocal<ArrayStack<Entry>> stack = new ThreadLocal<ArrayStack<Entry>>();
public void clear()
{
ArrayStack<Entry> stack = this.stack.get();
if (stack != null)
stack.clear();
}
public String get()
{
ArrayStack<Entry> stack = this.stack.get();
return stack == null || stack.isEmpty() ? null : stack.peek().merged;
}
public int getDepth()
{
ArrayStack<Entry> stack = this.stack.get();
return stack == null ? 0 : stack.size();
}
public String peek()
{
ArrayStack<Entry> stack = this.stack.get();
return stack == null || stack.isEmpty() ? "" : stack.peek().current;
}
public String pop()
{
ArrayStack<Entry> stack = this.stack.get();
return stack == null || stack.isEmpty() ? "" : stack.pop().current;
}
public void push(String message)
{
ArrayStack<Entry> stack = this.stack.get();
if (stack == null)
{
stack = new ArrayStack<Entry>();
this.stack.set(stack);
}
stack.push(stack.isEmpty() ? new Entry(message) : new Entry(stack.peek(), message));
}
public void setMaxDepth(int maxDepth)
{
ArrayStack<Entry> stack = this.stack.get();
if (stack != null)
stack.setSize(maxDepth);
}
}