Source/WebCore/storage/IDBFactoryBackendImpl.cpp

/*
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 *     from this software without specific prior written permission.
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#include "config.h"
#include "IDBFactoryBackendImpl.h"

#include "DOMStringList.h"
#include "IDBDatabaseBackendImpl.h"
#include "IDBDatabaseException.h"
#include "IDBLevelDBBackingStore.h"
#include "IDBSQLiteBackingStore.h"
#include "IDBTransactionCoordinator.h"
#include "SecurityOrigin.h"
#include <wtf/Threading.h>
#include <wtf/UnusedParam.h>

#if ENABLE(INDEXED_DATABASE)

namespace WebCore {

IDBFactoryBackendImpl::IDBFactoryBackendImpl()
    : m_transactionCoordinator(IDBTransactionCoordinator::create())
{
}

IDBFactoryBackendImpl::~IDBFactoryBackendImpl()
{
}

void IDBFactoryBackendImpl::removeIDBDatabaseBackend(const String& uniqueIdentifier)
{
    ASSERT(m_databaseBackendMap.contains(uniqueIdentifier));
    m_databaseBackendMap.remove(uniqueIdentifier);
}

void IDBFactoryBackendImpl::addIDBBackingStore(const String& uniqueIdentifier, IDBBackingStore* backingStore)
{
    ASSERT(!m_backingStoreMap.contains(uniqueIdentifier));
    m_backingStoreMap.set(uniqueIdentifier, backingStore);
}

void IDBFactoryBackendImpl::removeIDBBackingStore(const String& uniqueIdentifier)
{
    ASSERT(m_backingStoreMap.contains(uniqueIdentifier));
    m_backingStoreMap.remove(uniqueIdentifier);
}

void IDBFactoryBackendImpl::open(const String& name, PassRefPtr<IDBCallbacks> callbacks, PassRefPtr<SecurityOrigin> securityOrigin, Frame*, const String& dataDir, int64_t maximumSize, BackingStoreType backingStoreType)
{
    String uniqueIdentifier = securityOrigin->databaseIdentifier() + "@" + name + String::format("@%d", (int)backingStoreType);
    IDBDatabaseBackendMap::iterator it = m_databaseBackendMap.find(uniqueIdentifier);
    if (it != m_databaseBackendMap.end()) {
        callbacks->onSuccess(it->second);
        return;
    }

    // FIXME: Everything from now on should be done on another thread.

    RefPtr<IDBBackingStore> backingStore;
    IDBBackingStoreMap::iterator it2 = m_backingStoreMap.find(uniqueIdentifier);
    if (it2 != m_backingStoreMap.end() && (backingStoreType == it2->second->backingStoreType()))
        backingStore = it2->second;
    else {
#if ENABLE(LEVELDB)
        // Should we migrate this backing store?
        bool hasSQLBackingStore = IDBSQLiteBackingStore::backingStoreExists(securityOrigin.get(), dataDir);
        bool hasLevelDBBackingStore = IDBLevelDBBackingStore::backingStoreExists(securityOrigin.get(), dataDir);

        if (hasSQLBackingStore && hasLevelDBBackingStore)
            backingStoreType = LevelDBBackingStore;

        // Migration: if the database exists and is SQLite we want to migrate it to LevelDB.
        if (hasSQLBackingStore && !hasLevelDBBackingStore) {
            if (migrate(name, securityOrigin.get(), dataDir, maximumSize))
                backingStoreType = LevelDBBackingStore;
        }
#endif

        if (backingStoreType == DefaultBackingStore || backingStoreType == SQLiteBackingStore)
            backingStore = IDBSQLiteBackingStore::open(securityOrigin.get(), dataDir, maximumSize, uniqueIdentifier, this);
#if ENABLE(LEVELDB)
        else if (backingStoreType == LevelDBBackingStore)
            backingStore = IDBLevelDBBackingStore::open(securityOrigin.get(), dataDir, maximumSize, uniqueIdentifier, this);
#endif
        if (!backingStore) {
            callbacks->onError(IDBDatabaseError::create(IDBDatabaseException::UNKNOWN_ERR, "Internal error."));
            return;
        }
    }

    RefPtr<IDBDatabaseBackendImpl> databaseBackend = IDBDatabaseBackendImpl::create(name, backingStore.get(), m_transactionCoordinator.get(), this, uniqueIdentifier);
    callbacks->onSuccess(databaseBackend.get());
    m_databaseBackendMap.set(uniqueIdentifier, databaseBackend.get());
}

bool IDBFactoryBackendImpl::migrate(const String& name, SecurityOrigin* securityOrigin, const String& dataDir, int64_t maximumSize)
{
    return false;
}

} // namespace WebCore

#endif // ENABLE(INDEXED_DATABASE)