/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 Neil Deakin
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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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 *
 * ***** END LICENSE BLOCK ***** */

#include "nscore.h"
#include "nsCOMPtr.h"

#include "nsXULTemplateQueryProcessorRDF.h"
#include "nsRDFQuery.h"

NS_IMPL_CYCLE_COLLECTION_1(nsRDFQuery, mQueryNode)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsRDFQuery)
  NS_INTERFACE_MAP_ENTRY(nsITemplateRDFQuery)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsRDFQuery)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsRDFQuery)

void
nsRDFQuery::Finish()
{
    // the template builder is going away and the query processor likely as
    // well. Clear the reference to avoid calling it.
    mProcessor = nsnull;
    mCachedResults = nsnull;
}

nsresult
nsRDFQuery::SetCachedResults(nsXULTemplateQueryProcessorRDF* aProcessor,
                             const InstantiationSet& aInstantiations)
{
    mCachedResults = new nsXULTemplateResultSetRDF(aProcessor, this, &aInstantiations);
    if (! mCachedResults)
        return NS_ERROR_OUT_OF_MEMORY;

    return NS_OK;
}


void
nsRDFQuery::UseCachedResults(nsISimpleEnumerator** aResults)
{
    *aResults = mCachedResults;
    NS_IF_ADDREF(*aResults);

    mCachedResults = nsnull;
}