/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
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** GNU Lesser General Public License Usage
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** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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** Alternatively, this file may be used in accordance with the terms and
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****************************************************************************/

#ifndef QDECLARATIVEDATA_P_H
#define QDECLARATIVEDATA_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <private/qobject_p.h>

#include <private/qv8_p.h>

QT_BEGIN_NAMESPACE

template <class Key, class T> class QHash;
class QDeclarativeGuardImpl;
class QDeclarativeCompiledData;
class QDeclarativeAbstractBinding;
class QDeclarativeContext;
class QDeclarativePropertyCache;
class QDeclarativeContextData;
class QDeclarativeNotifier;
class QDeclarativeDataExtended;
class QDeclarativeNotifierEndpoint;
// This class is structured in such a way, that simply zero'ing it is the
// default state for elemental object allocations.  This is crucial in the
// workings of the QDeclarativeInstruction::CreateSimpleObject instruction.
// Don't change anything here without first considering that case!
class Q_DECLARATIVE_EXPORT QDeclarativeData : public QAbstractDeclarativeData
{
public:
    QDeclarativeData()
        : ownMemory(true), ownContext(false), indestructible(true), explicitIndestructibleSet(false), 
          hasTaintedV8Object(false), notifyList(0), context(0), outerContext(0), bindings(0), 
          nextContextObject(0), prevContextObject(0), bindingBitsSize(0), bindingBits(0), 
          lineNumber(0), columnNumber(0), deferredComponent(0), deferredIdx(0), v8objectid(0), 
          propertyCache(0), guards(0), extendedData(0) {
          init(); 
    }

    static inline void init() {
        QAbstractDeclarativeData::destroyed = destroyed;
        QAbstractDeclarativeData::parentChanged = parentChanged;
        QAbstractDeclarativeData::objectNameChanged = objectNameChanged;
        QAbstractDeclarativeData::signalEmitted = signalEmitted;
    }

    static void destroyed(QAbstractDeclarativeData *, QObject *);
    static void parentChanged(QAbstractDeclarativeData *, QObject *, QObject *);
    static void objectNameChanged(QAbstractDeclarativeData *, QObject *);
    static void signalEmitted(QAbstractDeclarativeData *, QObject *, int, void **);

    void destroyed(QObject *);
    void parentChanged(QObject *, QObject *);
    void objectNameChanged(QObject *);

    void setImplicitDestructible() {
        if (!explicitIndestructibleSet) indestructible = false;
    }

    quint32 ownMemory:1;
    quint32 ownContext:1;
    quint32 indestructible:1;
    quint32 explicitIndestructibleSet:1;
    quint32 hasTaintedV8Object:1;
    quint32 dummy:27;

    struct NotifyList {
        quint64 connectionMask;

        quint16 maximumTodoIndex;
        quint16 notifiesSize;

        QDeclarativeNotifierEndpoint *todo;
        QDeclarativeNotifierEndpoint**notifies;
        void layout();
    private:
        void layout(QDeclarativeNotifierEndpoint*);
    };
    NotifyList *notifyList;
    
    inline QDeclarativeNotifierEndpoint *notify(int index);
    void addNotify(int index, QDeclarativeNotifierEndpoint *);

    // The context that created the C++ object
    QDeclarativeContextData *context; 
    // The outermost context in which this object lives
    QDeclarativeContextData *outerContext;

    QDeclarativeAbstractBinding *bindings;

    // Linked list for QDeclarativeContext::contextObjects
    QDeclarativeData *nextContextObject;
    QDeclarativeData**prevContextObject;

    int bindingBitsSize;
    quint32 *bindingBits; 
    bool hasBindingBit(int) const;
    void clearBindingBit(int);
    void setBindingBit(QObject *obj, int);

    ushort lineNumber;
    ushort columnNumber;

    QDeclarativeCompiledData *deferredComponent; // Can't this be found from the context?
    unsigned int deferredIdx;

    quint32 v8objectid;
    v8::Persistent<v8::Object> v8object;

    QDeclarativePropertyCache *propertyCache;

    QDeclarativeGuardImpl *guards;

    static QDeclarativeData *get(const QObject *object, bool create = false) {
        QObjectPrivate *priv = QObjectPrivate::get(const_cast<QObject *>(object));
        if (priv->wasDeleted) {
            Q_ASSERT(!create);
            return 0;
        } else if (priv->declarativeData) {
            return static_cast<QDeclarativeData *>(priv->declarativeData);
        } else if (create) {
            priv->declarativeData = new QDeclarativeData;
            return static_cast<QDeclarativeData *>(priv->declarativeData);
        } else {
            return 0;
        }
    }

    bool hasExtendedData() const { return extendedData != 0; }
    QDeclarativeNotifier *objectNameNotifier() const;
    QHash<int, QObject *> *attachedProperties() const;

private:
    // For objectNameNotifier and attachedProperties
    mutable QDeclarativeDataExtended *extendedData;
};

QDeclarativeNotifierEndpoint *QDeclarativeData::notify(int index)
{
    Q_ASSERT(index <= 0xFFFF);

    if (!notifyList || !(notifyList->connectionMask & (1ULL << quint64(index % 64)))) {
        return 0;
    } else if (index < notifyList->notifiesSize) {
        return notifyList->notifies[index];
    } else if (index <= notifyList->maximumTodoIndex) {
        notifyList->layout();
    }

    if (index < notifyList->notifiesSize) {
        return notifyList->notifies[index];
    } else {
        return 0;
    }
}

QT_END_NAMESPACE

#endif // QDECLARATIVEDATA_P_H