/*

 * This file is part of the XSL implementation.

 *

 * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#include "config.h"

#include "XSLImportRule.h"

#if ENABLE(XSLT)

#include "CachedXSLStyleSheet.h"

#include "DocLoader.h"

#include "XSLStyleSheet.h"

namespace WebCore {

XSLImportRule::XSLImportRule(XSLStyleSheet* parent, const String& href)

    : StyleBase(parent)

    , m_strHref(href)

    , m_cachedSheet(0)

    , m_loading(false)

{

}

XSLImportRule::~XSLImportRule()

{

    if (m_styleSheet)

        m_styleSheet->setParent(0);

    if (m_cachedSheet)

        m_cachedSheet->removeClient(this);

}

XSLStyleSheet* XSLImportRule::parentStyleSheet() const

{

    return (parent() && parent()->isXSLStyleSheet()) ? static_cast<XSLStyleSheet*>(parent()) : 0;

}

void XSLImportRule::setXSLStyleSheet(const String& url, const String& sheet)

{

    if (m_styleSheet)

        m_styleSheet->setParent(0);

    m_styleSheet = XSLStyleSheet::create(this, url);

    XSLStyleSheet* parent = parentStyleSheet();

    if (parent)

        m_styleSheet->setParentStyleSheet(parent);

    m_styleSheet->parseString(sheet);

    m_loading = false;

    if (parent)

        parent->checkLoaded();

}

bool XSLImportRule::isLoading()

{

    return (m_loading || (m_styleSheet && m_styleSheet->isLoading()));

}

void XSLImportRule::loadSheet()

{

    DocLoader* docLoader = 0;

    StyleBase* root = this;

    StyleBase* parent;

    while ((parent = root->parent()))

        root = parent;

    if (root->isXSLStyleSheet())

        docLoader = static_cast<XSLStyleSheet*>(root)->docLoader();

    String absHref = m_strHref;

    XSLStyleSheet* parentSheet = parentStyleSheet();

    if (!parentSheet->href().isNull())

        // use parent styleheet's URL as the base URL

        absHref = KURL(KURL(ParsedURLString, parentSheet->href()), m_strHref).string();

    // Check for a cycle in our import chain.  If we encounter a stylesheet

    // in our parent chain with the same URL, then just bail.

    for (parent = this->parent(); parent; parent = parent->parent()) {

        if (parent->isXSLStyleSheet() && absHref == static_cast<XSLStyleSheet*>(parent)->href())

            return;

    }

    m_cachedSheet = docLoader->requestXSLStyleSheet(absHref);

    if (m_cachedSheet) {

        m_cachedSheet->addClient(this);

        // If the imported sheet is in the cache, then setXSLStyleSheet gets called,

        // and the sheet even gets parsed (via parseString).  In this case we have

        // loaded (even if our subresources haven't), so if we have a stylesheet after

        // checking the cache, then we've clearly loaded.

        if (!m_styleSheet)

            m_loading = true;

    }

}

} // namespace WebCore

#endif // ENABLE(XSLT)