// $Header: /home/cvs/jakarta-jmeter/src/jorphan/org/apache/jorphan/util/ClassContext.java,v 1.5 2004/03/30 18:07:21 sebb Exp $
/*
 * Copyright 2003-2004 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.jorphan.util;

/**
 * Class to get access to the protected getClassContext() method of
 * SecurityManager, thus obtaining the call stack.
 * 
 * May not work with applications that install their own security managers.
 * 
 * @version $Revision: 1.5 $ last updated $Date: 2004/03/30 18:07:21 $
 */
public final class ClassContext extends SecurityManager
{
    /**
     * Private constructor to prevent instantiation.
     */
    private ClassContext()
    {
    }

    private static ClassContext _instance = new ClassContext();

    /*
     * N.B. Both static routines pick up the instance context directly
     * This ensures that both return the same stack depth
     */

    /**
     * Gets the calling context as an array of classes
     * Class[0] is this class.
     *  
     * @return Class[] - list of classes in the callers context
     */
    public static Class[] getMyClassContext()
    {
        return _instance.getClassContext();
    }
    /**
     * Get the name of the class at a particular stack depth
     * i=0 gives this class
     * 
     * @param i - stack depth
     * @return String - name of class at depth i
     */
    public static String getCallerClassNameAt(int i)
    {
        return _instance.getClassContext()[i].getName();
    }
}