public static Object find(PageContext pc,
    String name) 
{
	Object ret = get(pc, name, PageContext.PAGE_SCOPE);
	if (ret == null) {
	    ret = get(pc, name, PageContext.REQUEST_SCOPE);
	    if (ret == null) {
		if (pc.getSession() != null) {
		    // check session only if a session is present
		    ret = get(pc, name, PageContext.SESSION_SCOPE);
		}
		if (ret == null) {
		    ret = get(pc, name, PageContext.APPLICATION_SCOPE);
		    if (ret == null) {
			ret = pc.getServletContext().getInitParameter(name);
		    }
		}
	    }
	}
	return ret;
}

Finds the value associated with a specific configuration setting identified by its context initialization parameter name.

For each of the JSP scopes (page, request, session, application), get the value of the configuration variable identified by name using method get(). Return as soon as a non-null value is found. If no value is found, get the value of the context initialization parameter identified by name.

 public static Object get(ServletRequest request,
    String name) 
{
	return request.getAttribute(name + REQUEST_SCOPE_SUFFIX);
}

Looks up a configuration variable in the "request" scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static Object get(HttpSession session,
    String name) 
{
        Object ret = null;
        if (session != null) {
            try {
                ret = session.getAttribute(name + SESSION_SCOPE_SUFFIX);
            } catch (IllegalStateException ex) {} // when session is invalidated
        }
        return ret;
}

Looks up a configuration variable in the "session" scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static Object get(ServletContext context,
    String name) 
{
	return context.getAttribute(name + APPLICATION_SCOPE_SUFFIX);
}

Looks up a configuration variable in the "application" scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static Object get(PageContext pc,
    String name,
    int scope) 
{
	switch (scope) {
	case PageContext.PAGE_SCOPE:
	    return pc.getAttribute(name + PAGE_SCOPE_SUFFIX, scope);
	case PageContext.REQUEST_SCOPE:
	    return pc.getAttribute(name + REQUEST_SCOPE_SUFFIX, scope);
	case PageContext.SESSION_SCOPE:
	    return get(pc.getSession(), name);
	case PageContext.APPLICATION_SCOPE:
	    return pc.getAttribute(name + APPLICATION_SCOPE_SUFFIX, scope);
	default:
	    throw new IllegalArgumentException("unknown scope");
	}
}

Looks up a configuration variable in the given scope.

The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static  void remove(ServletRequest request,
    String name) 
{
	request.removeAttribute(name + REQUEST_SCOPE_SUFFIX);
}

Removes a configuration variable from the "request" scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

 public static  void remove(HttpSession session,
    String name) 
{
	session.removeAttribute(name + SESSION_SCOPE_SUFFIX);
}

Removes a configuration variable from the "session" scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

 public static  void remove(ServletContext context,
    String name) 
{
	context.removeAttribute(name + APPLICATION_SCOPE_SUFFIX);
}

Removes a configuration variable from the "application" scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

 public static  void remove(PageContext pc,
    String name,
    int scope) 
{
	switch (scope) {
	case PageContext.PAGE_SCOPE:
	    pc.removeAttribute(name + PAGE_SCOPE_SUFFIX, scope);
	    break;
	case PageContext.REQUEST_SCOPE:
	    pc.removeAttribute(name + REQUEST_SCOPE_SUFFIX, scope);
	    break;
	case PageContext.SESSION_SCOPE:
	    pc.removeAttribute(name + SESSION_SCOPE_SUFFIX, scope);
	    break;
	case PageContext.APPLICATION_SCOPE:
	    pc.removeAttribute(name + APPLICATION_SCOPE_SUFFIX, scope);
	    break;
	default:
	    throw new IllegalArgumentException("unknown scope");
	}
}

Removes a configuration variable from the given scope.

Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

 public static  void set(ServletRequest request,
    String name,
    Object value) 
{
	request.setAttribute(name + REQUEST_SCOPE_SUFFIX, value);
}

Sets the value of a configuration variable in the "request" scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static  void set(HttpSession session,
    String name,
    Object value) 
{
	session.setAttribute(name + SESSION_SCOPE_SUFFIX, value);
}

Sets the value of a configuration variable in the "session" scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static  void set(ServletContext context,
    String name,
    Object value) 
{
	context.setAttribute(name + APPLICATION_SCOPE_SUFFIX, value);
}

Sets the value of a configuration variable in the "application" scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

 public static  void set(PageContext pc,
    String name,
    Object value,
    int scope) 
{
	switch (scope) {
	case PageContext.PAGE_SCOPE:
	    pc.setAttribute(name + PAGE_SCOPE_SUFFIX, value, scope);
	    break;
	case PageContext.REQUEST_SCOPE:
	    pc.setAttribute(name + REQUEST_SCOPE_SUFFIX, value, scope);
	    break;
	case PageContext.SESSION_SCOPE:
	    pc.setAttribute(name + SESSION_SCOPE_SUFFIX, value, scope);
	    break;
	case PageContext.APPLICATION_SCOPE:
	    pc.setAttribute(name + APPLICATION_SCOPE_SUFFIX, value, scope);
	    break;
	default:
	    throw new IllegalArgumentException("unknown scope");
	}
}

Sets the value of a configuration variable in the given scope.

Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.