/*

 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer. 

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution. 

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission. 

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#import "WebDocumentLoaderMac.h"

#import "WebKitVersionChecks.h"

#import "WebView.h"

using namespace WebCore;

WebDocumentLoaderMac::WebDocumentLoaderMac(const ResourceRequest& request, const SubstituteData& substituteData)

    : DocumentLoader(request, substituteData)

    , m_dataSource(nil)

    , m_isDataSourceRetained(false)

{

}

static inline bool needsDataLoadWorkaround(WebView *webView)

{

#ifdef BUILDING_ON_TIGER

    // Tiger has to be a little less efficient.

    id frameLoadDelegate = [webView frameLoadDelegate];

    if (!frameLoadDelegate)

        return false;

    NSString *bundleIdentifier = [[NSBundle bundleForClass:[frameLoadDelegate class]] bundleIdentifier];

    if ([bundleIdentifier isEqualToString:@"com.apple.AppKit"])

        return true;

    if ([bundleIdentifier isEqualToString:@"com.adobe.Installers.Setup"])

        return true;

    return false;

#else

    static bool needsWorkaround = !WebKitLinkedOnOrAfter(WEBKIT_FIRST_VERSION_WITHOUT_VITALSOURCE_QUIRK) 

                                  && [[[NSBundle mainBundle] bundleIdentifier] isEqualToString:@"com.adobe.Installers.Setup"];

    return needsWorkaround;

#endif

}

void WebDocumentLoaderMac::setDataSource(WebDataSource *dataSource, WebView *webView)

{

    ASSERT(!m_dataSource);

    ASSERT(!m_isDataSourceRetained);

    m_dataSource = dataSource;

    retainDataSource();

    m_resourceLoadDelegate = [webView resourceLoadDelegate];

    m_downloadDelegate = [webView downloadDelegate];

    // Some clients run the run loop in a way that prevents the data load timer

    // from firing. We work around that issue here. See <rdar://problem/5266289>

    // and <rdar://problem/5049509>.

    if (needsDataLoadWorkaround(webView))

        m_deferMainResourceDataLoad = false;

}

WebDataSource *WebDocumentLoaderMac::dataSource() const

{

    return m_dataSource;

}

void WebDocumentLoaderMac::attachToFrame()

{

    DocumentLoader::attachToFrame();

    retainDataSource();

}

void WebDocumentLoaderMac::detachFromFrame()

{

    DocumentLoader::detachFromFrame();

    if (m_loadingResources.isEmpty())

        releaseDataSource();

    // FIXME: What prevents the data source from getting deallocated while the

    // frame is not attached?

}

void WebDocumentLoaderMac::increaseLoadCount(unsigned long identifier)

{

    ASSERT(m_dataSource);

    if (m_loadingResources.contains(identifier))

        return;

    m_loadingResources.add(identifier);

    retainDataSource();

}

void WebDocumentLoaderMac::decreaseLoadCount(unsigned long identifier)

{

    HashSet<unsigned long>::iterator it = m_loadingResources.find(identifier);

    // It is valid for a load to be cancelled before it's started.

    if (it == m_loadingResources.end())

        return;

    m_loadingResources.remove(it);

    if (m_loadingResources.isEmpty()) {

        m_resourceLoadDelegate = 0;

        m_downloadDelegate = 0;

        if (!frame())

            releaseDataSource();

    }

}

void WebDocumentLoaderMac::retainDataSource()

{

    if (m_isDataSourceRetained || !m_dataSource)

        return;

    m_isDataSourceRetained = true;

    CFRetain(m_dataSource);

}

void WebDocumentLoaderMac::releaseDataSource()

{

    if (!m_isDataSourceRetained)

        return;

    ASSERT(m_dataSource);

    m_isDataSourceRetained = false;

    CFRelease(m_dataSource);

}

void WebDocumentLoaderMac::detachDataSource()

{

    ASSERT(!m_isDataSourceRetained);

    m_dataSource = nil;

}