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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
//
// 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 Patternist_CacheCells_H
#define Patternist_CacheCells_H
#include <QList>
#include <QVector>
#include <private/qitem_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Represents a cache entry for a single Item,
* as opposed to for a sequence of items.
*
* A characteristic of the ItemCacheCell is that it has two states:
* either its full or it's not, since it only deals with a single
* item.
*
* Remember that cachedItem doesn't tell the state of the ItemCacheCell.
* For instance, it can have a null pointer, the empty sequence, and that
* can be the value of its cache.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class ItemCacheCell
{
public:
typedef QList<ItemCacheCell> List;
typedef QVector<ItemCacheCell> Vector;
enum CacheState
{
Full,
Empty
};
inline ItemCacheCell() : cacheState(Empty)
{
}
Item cachedItem;
CacheState cacheState;
};
/**
* @short Represents a cache entry for a sequence of items.
*
* As opposed to ItemCacheCell, ItemSequenceCacheCell can be partially
* populated: e.g, four items is in the cache while three remains in the
* source. For that reason ItemSequenceCacheCell in addition to the source
* also carried an QAbstractXmlForwardIterator which is the source, such
* that it can continue to populate the cache when it runs out.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class ItemSequenceCacheCell
{
public:
typedef QList<ItemSequenceCacheCell> List;
typedef QVector<ItemSequenceCacheCell> Vector;
enum CacheState
{
Full,
Empty,
PartiallyPopulated
};
inline ItemSequenceCacheCell() : cacheState(Empty)
, inUse(false)
{
}
Item::List cachedItems;
Item::Iterator::Ptr sourceIterator;
CacheState cacheState;
/**
* In XSL-T, we can have circularity which we cannot detect statically.
* For instance, a global variable invokes a template, and the template
* uses the variable. We can't detect that, because we can't figure out
* what template will be invoked.
*
* For solution we have this toggle, which is set temporarily on the
* cell such that EvaluationCache can detect whether it's trashing
* itself.
*
* One might think that it would be sufficient to flag usage of the
* variable in an arbitrary template, but that would also flag valid
* cases.
*/
bool inUse;
};
}
Q_DECLARE_TYPEINFO(QPatternist::ItemCacheCell, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QPatternist::ItemSequenceCacheCell, Q_MOVABLE_TYPE);
QT_END_NAMESPACE
#endif
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