/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (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.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * Seth Spitzer <sspitzer@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsSubscribeDataSource_h__
#define nsSubscribeDataSource_h__

#include "nsIRDFService.h"
#include "nsIRDFDataSource.h"
#include "nsIRDFResource.h"
#include "nsIRDFLiteral.h"
#include "nsCOMPtr.h"
#include "nsISubscribableServer.h"

/**
 * The subscribe data source.
 */
class nsSubscribeDataSource : public nsIRDFDataSource, public nsISubscribeDataSource
{

public:
	nsSubscribeDataSource();
	virtual ~nsSubscribeDataSource();

	nsresult Init();

	NS_DECL_ISUPPORTS
    NS_DECL_NSIRDFDATASOURCE
    NS_DECL_NSISUBSCRIBEDATASOURCE

private:
    nsCOMPtr <nsIRDFResource>      kNC_Child;
    nsCOMPtr <nsIRDFResource>      kNC_Name;    
    nsCOMPtr <nsIRDFResource>      kNC_LeafName;
    nsCOMPtr <nsIRDFResource>      kNC_Subscribed;
    nsCOMPtr <nsIRDFResource>      kNC_Subscribable;
    nsCOMPtr <nsIRDFResource>      kNC_ServerType;
    nsCOMPtr <nsIRDFLiteral>       kTrueLiteral;
    nsCOMPtr <nsIRDFLiteral>       kFalseLiteral;

    nsCOMPtr <nsIRDFService>       mRDFService;
    nsCOMPtr <nsISupportsArray>    mObservers;

    nsresult GetChildren(nsISubscribableServer *server, const char *relativePath, nsISimpleEnumerator** aResult);
    nsresult GetServerAndRelativePathFromResource(nsIRDFResource *source, nsISubscribableServer **server, char **relativePath);
    nsresult GetServerType(nsISubscribableServer *server, char **serverType);

    static PRBool assertEnumFunc(nsISupports *aElement, void *aData);
    static PRBool unassertEnumFunc(nsISupports *aElement, void *aData);
    static PRBool changeEnumFunc(nsISupports *aElement, void *aData);
};

#endif /* nsSubscribedDataSource_h__ */
