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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

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/*
 * Copyright 2008 Niclas Hedhman. All rights Reserved.
 *
 * 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. 
 */
// Modified to work in Pax Logging.
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

//      Contributors:      Dan Milstein
//                         Ray Millard

package org.apache.log4j;

import java.util.Stack;

/**
 * Nested Diagnostic Context.
 *
 * NOTE: This class is added to Pax Logging ONLY TO PROVIDE THE API.
 * There is NO SUPPORT for NDC in Pax Logging.
 */

public class NDC
{

    // No instances allowed.
    private NDC()
    {
    }

    /**
     * Dummy method. Does not do anything.
     */
    public static void clear()
    {
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @return an empty stack.
     */
    public static Stack cloneStack()
    {
        return new Stack();
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @param stack ignored
     */
    public static void inherit( Stack stack )
    {
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @return an empty string.
     */
    static public String get()
    {
        return "";
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @return 0 (zero)
     */
    public static int getDepth()
    {
        return 0;
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @return an empty string
     */
    public static String pop()
    {
        return "";
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @return an empty string
     */
    public static String peek()
    {
        return "";
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @param message ignored
     */
    public static void push( String message )
    {
    }

    /**
     * Dummy method. Does not do anything.
     */
    static public void remove()
    {
    }

    /**
     * Dummy method. Does not do anything.
     *
     * @param maxDepth ignored
     */
    static public void setMaxDepth( int maxDepth )
    {
    }
}