/*

 * Copyright (C) 2008 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.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE 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 APPLE 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 "StorageNamespaceImpl.h"

#if ENABLE(DOM_STORAGE)

#include "SecurityOriginHash.h"

#include "StringHash.h"

#include "StorageAreaImpl.h"

#include "StorageMap.h"

#include "StorageSyncManager.h"

#include <wtf/StdLibExtras.h>

namespace WebCore {

typedef HashMap<String, StorageNamespace*> LocalStorageNamespaceMap;

static LocalStorageNamespaceMap& localStorageNamespaceMap()

{

    DEFINE_STATIC_LOCAL(LocalStorageNamespaceMap, localStorageNamespaceMap, ());

    return localStorageNamespaceMap;

}

PassRefPtr<StorageNamespace> StorageNamespaceImpl::localStorageNamespace(const String& path, unsigned quota)

{

    const String lookupPath = path.isNull() ? String("") : path;

    LocalStorageNamespaceMap::iterator it = localStorageNamespaceMap().find(lookupPath);

    if (it == localStorageNamespaceMap().end()) {

        RefPtr<StorageNamespace> storageNamespace = adoptRef(new StorageNamespaceImpl(LocalStorage, lookupPath, quota));

        localStorageNamespaceMap().set(lookupPath, storageNamespace.get());

        return storageNamespace.release();

    }

    return it->second;

}

PassRefPtr<StorageNamespace> StorageNamespaceImpl::sessionStorageNamespace()

{

    return adoptRef(new StorageNamespaceImpl(SessionStorage, String(), StorageMap::noQuota));

}

StorageNamespaceImpl::StorageNamespaceImpl(StorageType storageType, const String& path, unsigned quota)

    : m_storageType(storageType)

    , m_path(path.crossThreadString())

    , m_syncManager(0)

    , m_quota(quota)

    , m_isShutdown(false)

{

    if (m_storageType == LocalStorage && !m_path.isEmpty())

        m_syncManager = StorageSyncManager::create(m_path);

}

StorageNamespaceImpl::~StorageNamespaceImpl()

{

    ASSERT(isMainThread());

    if (m_storageType == LocalStorage) {

        ASSERT(localStorageNamespaceMap().get(m_path) == this);

        localStorageNamespaceMap().remove(m_path);

    }

    if (!m_isShutdown)

        close();

}

PassRefPtr<StorageNamespace> StorageNamespaceImpl::copy()

{

    ASSERT(isMainThread());

    ASSERT(!m_isShutdown);

    ASSERT(m_storageType == SessionStorage);

    StorageNamespaceImpl* newNamespace = new StorageNamespaceImpl(m_storageType, m_path, m_quota);

    StorageAreaMap::iterator end = m_storageAreaMap.end();

    for (StorageAreaMap::iterator i = m_storageAreaMap.begin(); i != end; ++i)

        newNamespace->m_storageAreaMap.set(i->first, i->second->copy());

    return adoptRef(newNamespace);

}

PassRefPtr<StorageArea> StorageNamespaceImpl::storageArea(PassRefPtr<SecurityOrigin> prpOrigin)

{

    ASSERT(isMainThread());

    ASSERT(!m_isShutdown);

    RefPtr<SecurityOrigin> origin = prpOrigin;

    RefPtr<StorageAreaImpl> storageArea;

    if (storageArea = m_storageAreaMap.get(origin))

        return storageArea.release();

    storageArea = StorageAreaImpl::create(m_storageType, origin, m_syncManager, m_quota);

    m_storageAreaMap.set(origin.release(), storageArea);

    return storageArea.release();

}

void StorageNamespaceImpl::close()

{

    ASSERT(isMainThread());

    ASSERT(!m_isShutdown);

    // If we're session storage, we shouldn't need to do any work here.

    if (m_storageType == SessionStorage) {

        ASSERT(!m_syncManager);

        return;

    }

    StorageAreaMap::iterator end = m_storageAreaMap.end();

    for (StorageAreaMap::iterator it = m_storageAreaMap.begin(); it != end; ++it)

        it->second->close();

    if (m_syncManager)

        m_syncManager->close();

    m_isShutdown = true;

}

void StorageNamespaceImpl::unlock()

{

    // Because there's a single event loop per-process, this is a no-op.

}

} // namespace WebCore

#endif // ENABLE(DOM_STORAGE)