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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| |
| // |
| // 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 |