/*

 * Copyright (C) 2009 Google Inc. All Rights Reserved.

 *           (C) 2008 Apple Inc.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``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 GOOGLE INC. OR

 * 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.

 */

#include "config.h"

#include "StorageAreaProxy.h"

#if ENABLE(DOM_STORAGE)

#include "DOMWindow.h"

#include "Document.h"

#include "EventNames.h"

#include "ExceptionCode.h"

#include "Frame.h"

#include "Page.h"

#include "PageGroup.h"

#include "SecurityOrigin.h"

#include "StorageAreaImpl.h"

#include "StorageEvent.h"

#include "WebFrameImpl.h"

#include "WebStorageArea.h"

#include "WebString.h"

#include "WebURL.h"

namespace WebCore {

StorageAreaProxy::StorageAreaProxy(WebKit::WebStorageArea* storageArea, StorageType storageType)

    : m_storageArea(storageArea)

    , m_storageType(storageType)

{

}

StorageAreaProxy::~StorageAreaProxy()

{

}

unsigned StorageAreaProxy::length() const

{

    return m_storageArea->length();

}

String StorageAreaProxy::key(unsigned index) const

{

    return m_storageArea->key(index);

}

String StorageAreaProxy::getItem(const String& key) const

{

    return m_storageArea->getItem(key);

}

String StorageAreaProxy::setItem(const String& key, const String& value, ExceptionCode& ec, Frame* frame)

{

    WebKit::WebStorageArea::Result result = WebKit::WebStorageArea::ResultOK;

    WebKit::WebString oldValue;

    WebKit::WebFrame* webFrame = WebKit::WebFrameImpl::fromFrame(frame);

    m_storageArea->setItem(key, value, frame->document()->url(), result, oldValue, webFrame);

    ec = (result == WebKit::WebStorageArea::ResultOK) ? 0 : QUOTA_EXCEEDED_ERR;

    String oldValueString = oldValue;

    if (oldValueString != value && result == WebKit::WebStorageArea::ResultOK)

        storageEvent(key, oldValue, value, m_storageType, frame->document()->securityOrigin(), frame);

    return oldValue;

}

String StorageAreaProxy::removeItem(const String& key, Frame* frame)

{

    WebKit::WebString oldValue;

    m_storageArea->removeItem(key, frame->document()->url(), oldValue);

    if (!oldValue.isNull())

        storageEvent(key, oldValue, String(), m_storageType, frame->document()->securityOrigin(), frame);

    return oldValue;

}

bool StorageAreaProxy::clear(Frame* frame)

{

    bool clearedSomething;

    m_storageArea->clear(frame->document()->url(), clearedSomething);

    if (clearedSomething)

        storageEvent(String(), String(), String(), m_storageType, frame->document()->securityOrigin(), frame);

    return clearedSomething;

}

bool StorageAreaProxy::contains(const String& key) const

{

    return !getItem(key).isNull();

}

// Copied from WebCore/storage/StorageEventDispatcher.cpp out of necessity.  It's probably best to keep it current.

void StorageAreaProxy::storageEvent(const String& key, const String& oldValue, const String& newValue, StorageType storageType, SecurityOrigin* securityOrigin, Frame* sourceFrame)

{

    Page* page = sourceFrame->page();

    if (!page)

        return;

    // We need to copy all relevant frames from every page to a vector since sending the event to one frame might mutate the frame tree

    // of any given page in the group or mutate the page group itself.

    Vector<RefPtr<Frame> > frames;

    if (storageType == SessionStorage) {

        // Send events only to our page.

        for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {

            if (sourceFrame != frame && frame->document()->securityOrigin()->equal(securityOrigin))

                frames.append(frame);

        }

        for (unsigned i = 0; i < frames.size(); ++i) {

            ExceptionCode ec = 0;

            Storage* storage = frames[i]->domWindow()->sessionStorage(ec);

            if (!ec)

                frames[i]->document()->enqueueEvent(StorageEvent::create(eventNames().storageEvent, key, oldValue, newValue, sourceFrame->document()->url(), storage));

        }

    } else {

        // Send events to every page.

        const HashSet<Page*>& pages = page->group().pages();

        HashSet<Page*>::const_iterator end = pages.end();

        for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {

            for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree()->traverseNext()) {

                if (sourceFrame != frame && frame->document()->securityOrigin()->equal(securityOrigin))

                    frames.append(frame);

            }

        }

        for (unsigned i = 0; i < frames.size(); ++i) {

            ExceptionCode ec = 0;

            Storage* storage = frames[i]->domWindow()->localStorage(ec);

            if (!ec)

                frames[i]->document()->enqueueEvent(StorageEvent::create(eventNames().storageEvent, key, oldValue, newValue, sourceFrame->document()->url(), storage));

        }

    }

}

} // namespace WebCore

#endif // ENABLE(DOM_STORAGE)