Source/modules/webdatabase/ChangeVersionWrapper.cpp

/*
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#include "config.h"
#include "modules/webdatabase/ChangeVersionWrapper.h"

#include "modules/webdatabase/Database.h"
#include "modules/webdatabase/SQLError.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"

namespace WebCore {

ChangeVersionWrapper::ChangeVersionWrapper(const String& oldVersion, const String& newVersion)
    : m_oldVersion(oldVersion.isolatedCopy())
    , m_newVersion(newVersion.isolatedCopy())
{
}

bool ChangeVersionWrapper::performPreflight(SQLTransactionBackend* transaction)
{
    ASSERT(transaction && transaction->database());

    DatabaseBackend* database = transaction->database();

    String actualVersion;
    if (!database->getVersionFromDatabase(actualVersion)) {
        int sqliteError = database->sqliteDatabase().lastError();
        database->reportChangeVersionResult(1, SQLError::UNKNOWN_ERR, sqliteError);
        m_sqlError = SQLError::create(SQLError::UNKNOWN_ERR, "unable to read the current version",
                                      sqliteError, database->sqliteDatabase().lastErrorMsg());
        return false;
    }

    if (actualVersion != m_oldVersion) {
        database->reportChangeVersionResult(2, SQLError::VERSION_ERR, 0);
        m_sqlError = SQLError::create(SQLError::VERSION_ERR, "current version of the database and `oldVersion` argument do not match");
        return false;
    }

    return true;
}

bool ChangeVersionWrapper::performPostflight(SQLTransactionBackend* transaction)
{
    ASSERT(transaction && transaction->database());

    DatabaseBackend* database = transaction->database();

    if (!database->setVersionInDatabase(m_newVersion)) {
        int sqliteError = database->sqliteDatabase().lastError();
        database->reportChangeVersionResult(3, SQLError::UNKNOWN_ERR, sqliteError);
        m_sqlError = SQLError::create(SQLError::UNKNOWN_ERR, "unable to set new version in database",
                                      sqliteError, database->sqliteDatabase().lastErrorMsg());
        return false;
    }

    database->setExpectedVersion(m_newVersion);

    database->reportChangeVersionResult(0, -1, 0); // OK
    return true;
}

void ChangeVersionWrapper::handleCommitFailedAfterPostflight(SQLTransactionBackend* transaction)
{
    transaction->database()->setCachedVersion(m_oldVersion);
}

} // namespace WebCore