/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


/*

  A package of routines shared by the XUL content code.

 */

#include "mozilla/ArrayUtils.h"

#include "nsCollationCID.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsICollation.h"
#include "nsIDocument.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIServiceManager.h"
#include "nsXULContentUtils.h"
#include "nsLayoutCID.h"
#include "nsString.h"
#include "nsGkAtoms.h"
#include "XULDocument.h"

using namespace mozilla;
using dom::XULDocument;

//------------------------------------------------------------------------

nsICollation *nsXULContentUtils::gCollation;

//------------------------------------------------------------------------
// Constructors n' stuff
//

nsresult
nsXULContentUtils::Finish()
{
    NS_IF_RELEASE(gCollation);

    return NS_OK;
}

nsICollation*
nsXULContentUtils::GetCollation()
{
    if (!gCollation) {
        nsCOMPtr<nsICollationFactory> colFactory =
            do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID);
        if (colFactory) {
            DebugOnly<nsresult> rv = colFactory->CreateCollation(&gCollation);
            NS_ASSERTION(NS_SUCCEEDED(rv),
                         "couldn't create collation instance");
        } else
            NS_ERROR("couldn't create instance of collation factory");
    }

    return gCollation;
}


//------------------------------------------------------------------------
//

nsresult
nsXULContentUtils::FindChildByTag(nsIContent* aElement,
                                  int32_t aNameSpaceID,
                                  nsAtom* aTag,
                                  Element** aResult)
{
    for (nsIContent* child = aElement->GetFirstChild();
         child;
         child = child->GetNextSibling()) {

        if (child->IsElement() &&
            child->NodeInfo()->Equals(aTag, aNameSpaceID)) {
            NS_ADDREF(*aResult = child->AsElement());
            return NS_OK;
        }
    }

    *aResult = nullptr;
    return NS_RDF_NO_VALUE; // not found
}