/*

 * Copyright (C) 2010 Google 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.

 */

#include "config.h"

#include "IDBRequest.h"

#if ENABLE(INDEXED_DATABASE)

#include "Event.h"

#include "EventException.h"

#include "EventListener.h"

#include "EventNames.h"

#include "IDBDatabaseRequest.h"

#include "IDBIndexRequest.h"

#include "IDBErrorEvent.h"

#include "IDBObjectStoreRequest.h"

#include "IDBSuccessEvent.h"

#include "ScriptExecutionContext.h"

namespace WebCore {

IDBRequest::IDBRequest(ScriptExecutionContext* context, PassRefPtr<IDBAny> source)

    : ActiveDOMObject(context, this)

    , m_source(source)

    , m_result(IDBAny::create())

    , m_timer(this, &IDBRequest::timerFired)

    , m_stopped(false)

    , m_aborted(false)

    , m_readyState(INITIAL)

{

}

IDBRequest::~IDBRequest()

{

    if (m_readyState != DONE)

        abort();

}

void IDBRequest::onError(PassRefPtr<IDBDatabaseError> error)

{

    onEventCommon();

    m_error = error;

}

void IDBRequest::onSuccess()

{

    onEventCommon();

    m_result->set();

}

void IDBRequest::onSuccess(PassRefPtr<IDBDatabase> idbDatabase)

{

    onEventCommon();

    m_result->set(IDBDatabaseRequest::create(idbDatabase));

}

void IDBRequest::onSuccess(PassRefPtr<IDBIndex> idbIndex)

{

    onEventCommon();

    m_result->set(IDBIndexRequest::create(idbIndex));

}

void IDBRequest::onSuccess(PassRefPtr<IDBKey> idbKey)

{

    onEventCommon();

    m_result->set(idbKey);

}

void IDBRequest::onSuccess(PassRefPtr<IDBObjectStore> idbObjectStore)

{

    onEventCommon();

    m_result->set(IDBObjectStoreRequest::create(idbObjectStore));

}

void IDBRequest::onSuccess(PassRefPtr<SerializedScriptValue> serializedScriptValue)

{

    onEventCommon();

    m_result->set(serializedScriptValue);

}

void IDBRequest::abort()

{

    m_timer.stop();

    m_aborted = true;

    // FIXME: This should cancel any pending work being done in the backend.

}

ScriptExecutionContext* IDBRequest::scriptExecutionContext() const

{

    return ActiveDOMObject::scriptExecutionContext();

}

void IDBRequest::stop()

{

    abort();

    m_selfRef = 0; // Could trigger a delete.

}

void IDBRequest::suspend()

{

    m_timer.stop();

    m_stopped = true;

}

void IDBRequest::resume()

{

    m_stopped = false;

    // We only hold our self ref when we're waiting to dispatch an event.

    if (m_selfRef && !m_aborted)

        m_timer.startOneShot(0);

}

EventTargetData* IDBRequest::eventTargetData()

{

    return &m_eventTargetData;

}

EventTargetData* IDBRequest::ensureEventTargetData()

{

    return &m_eventTargetData;

}

void IDBRequest::timerFired(Timer<IDBRequest>*)

{

    ASSERT(m_readyState == DONE);

    ASSERT(m_selfRef);

    ASSERT(!m_stopped);

    ASSERT(!m_aborted);

    // We need to keep self-referencing ourself, otherwise it's possible we'll be deleted.

    // But in some cases, suspend() could be called while we're dispatching an event, so we

    // need to make sure that resume() doesn't re-start the timer based on m_selfRef being set.

    RefPtr<IDBRequest> selfRef = m_selfRef.release();

    if (m_error) {

        ASSERT(m_result->type() == IDBAny::UndefinedType);

        dispatchEvent(IDBErrorEvent::create(m_source, *m_error));

    } else {

        ASSERT(m_result->type() != IDBAny::UndefinedType);

        dispatchEvent(IDBSuccessEvent::create(m_source, m_result));        

    }

}

void IDBRequest::onEventCommon()

{

    ASSERT(m_readyState < DONE);

    ASSERT(m_result->type() == IDBAny::UndefinedType);

    ASSERT(!m_error);

    ASSERT(!m_selfRef);

    ASSERT(!m_timer.isActive());

    if (m_aborted)

        return;

    m_readyState = DONE;

    m_selfRef = this;

    if (!m_stopped)

        m_timer.startOneShot(0);

}

} // namespace WebCore

#endif