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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-ONLY$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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.
//
#ifndef QSCRIPTTOOLS_P_H
#define QSCRIPTTOOLS_P_H
#include <qdebug.h>
QT_BEGIN_NAMESPACE
template<class T>
class QScriptBagContainer;
/*!
\internal
\interface
Helper class for a container. The purpuse of it is to add two pointer properties to a class
inheriting this class without bloating an interface.
This class exist only as a memory storage implementation. The only way to use it is to inherit it.
*/
class QScriptLinkedNode
{
protected:
QScriptLinkedNode()
: m_next(0)
, m_prev(0)
{}
~QScriptLinkedNode()
{
Q_ASSERT_X(!isUsed(), Q_FUNC_INFO, "Destorying QScriptLinkedNode instance that still is in a container");
}
private:
bool isUsed() const
{
return m_next || m_prev;
}
#if defined(Q_NO_TEMPLATE_FRIENDS)
public:
#else
template<class T>
friend class QScriptBagContainer;
#endif
QScriptLinkedNode *m_next;
QScriptLinkedNode *m_prev;
};
/*!
\internal
The QScriptBagContainer is a simple, low level, set like container for a pointer type castable to
QScriptLinkedNode*.
Algorithms complexity:
put: O(1)
get: O(1)
forEach: O(n)
\note This container doesn't take ownership of pointed values.
\attention All values have to be unique.
*/
template<class T>
class QScriptBagContainer
{
public:
QScriptBagContainer()
: m_first(0)
{}
/*!
\internal
Add a this \a value to this container
*/
void insert(T* value)
{
//dump(Q_FUNC_INFO, value);
Q_ASSERT_X(!contains(value), Q_FUNC_INFO, "Can't insert a value which is in the bag already");
QScriptLinkedNode* v = static_cast<QScriptLinkedNode*>(value);
Q_ASSERT(v);
Q_ASSERT_X(!v->m_next && !v->m_prev, Q_FUNC_INFO, "Can't insert a value which is in an another bag");
if (m_first)
m_first->m_prev = v;
v->m_next = m_first;
v->m_prev = 0;
m_first = v;
}
/*!
\internal
Remove this \a value from this container
*/
void remove(T* value)
{
//dump(Q_FUNC_INFO, value);
QScriptLinkedNode* v = static_cast<QScriptLinkedNode*>(value);
Q_ASSERT(v);
if (!v->m_next && !v->m_prev && m_first != v) {
// ignore that value as it is not registered at all
// FIXME: That may be optimized out if unregister call is removed from ~QtDataBase
return;
}
Q_ASSERT_X(contains(value), Q_FUNC_INFO, "Can't remove a value which is not in the bag");
Q_ASSERT(v->m_prev || (m_first == v && !v->m_prev));
if (v->m_next)
v->m_next->m_prev= v->m_prev;
if (v->m_prev)
v->m_prev->m_next = v->m_next;
else
m_first = v->m_next;
// reset removed value
v->m_next = v->m_prev = 0;
}
/*!
\internal
Call \a fun for each element in this container. Fun should accept T* as a parameter.
\note In general it is not allowed to change this container by calling put() or get() unless
given value is the same as currently procceded by forEach.
*/
template<class Functor>
void forEach(Functor fun)
{
//dump(Q_FUNC_INFO);
QScriptLinkedNode *i = m_first;
QScriptLinkedNode *tmp;
while (i) {
tmp = i;
i = i->m_next;
fun(static_cast<T*>(tmp));
}
}
/*!
\internal
Clear this container.
*/
void clear()
{
m_first = 0;
}
/*!
\internal
Returns true if this container is empty; false otherwise.
*/
bool isEmpty() const
{
return !m_first;
}
// void dump(const char* msg, T* obj = 0) const
// {
// qDebug() << msg << obj;
// qDebug() << m_first;
// QScriptLinkedNode *i = m_first;
// while (i) {
// qDebug() <<" - " << i << "(" << i->m_prev << ", " << i->m_next <<")";
// i = i->m_next;
// }
// }
private:
bool contains(T *value) const
{
QScriptLinkedNode *i = m_first;
while (i) {
if (static_cast<T*>(i) == value)
return true;
i = i->m_next;
}
return false;
}
QScriptLinkedNode *m_first;
};
QT_END_NAMESPACE
#endif //QSCRIPTTOOLS_P_H
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