openamf/src/java/org/openamf RequestContext.java,NONE,1.1

Update of /cvsroot/openamf/openamf/src/java/org/openamf
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv12839/src/java/org/openamf

Added Files:
	RequestContext.java 
Log Message:
new class: RequestContext


--- NEW FILE: RequestContext.java ---
/*
 * www.openamf.org
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */

package org.openamf;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 *
 * This class allows web applications to 
 * easily access the HttpServletRequest object.
 *
 * OpenAMF's RequestContext class was inspired by the example code 
 * in chapter 7 of "Flash Remoting: The Definitive Guide"
 * by Tom Muck.
 * 
 * This class uses thread local storage.
 *  
 * To learn more about thread local storage, read this 
 * article:
 *  <a href="http://www-106.ibm.com/developerworks/java/library/j-threads3.html">
 *  http://www-106.ibm.com/developerworks/java/library/j-threads3.html</a>
 *  
 * @author Sean C. Sullivan
 * 
 */
public class RequestContext
{
	static private ThreadLocal requestData = new ThreadLocal();
	
    private RequestContext()
    {
        // private constructor
    }
    
    /**
     *  
     * @param req the servlet request object
     * 
     * @see #getHttpServletRequest()
     * 
     */
    static public void setHttpServletRequest(HttpServletRequest req)
	{
    	requestData.set(req);
    }
    
    /**
     * 
     * 
     * @return may return null
     * 
     * @see #setHttpServletRequest(HttpServletRequest)
     * 
     */
    static public HttpServletRequest getHttpServletRequest()
	{
    	HttpServletRequest req = (HttpServletRequest) requestData.get();
    	return req;
    }
    
    /**
     *  
     * @return a non-null value
     * 
     * @see #getHttpServletRequest
     * 
     */
    static public HttpSession getHttpSession()
	{
    	HttpServletRequest req = getHttpServletRequest();
    	if (req == null)
    	{
    		throw new IllegalStateException("HttpServletRequest is null");
    	}
    	return req.getSession(true);
    }
    
}



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