Qt 4.8
qtruthpredicate_p.h
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41 
42 //
43 // W A R N I N G
44 // -------------
45 //
46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
49 //
50 // We mean it.
51 
52 #ifndef Patternist_TruthPredicate_H
53 #define Patternist_TruthPredicate_H
54 
55 #include "qgenericpredicate_p.h"
56 
58 
60 
61 namespace QPatternist
62 {
71  {
72  public:
80  TruthPredicate(const Expression::Ptr &sourceExpression,
81  const Expression::Ptr &predicate);
82 
83  inline Item mapToItem(const Item &item, const DynamicContext::Ptr &context) const
84  {
85  Q_ASSERT_X(false, Q_FUNC_INFO, "This is practically dead code because it never gets called in GenericPredicate, "
86  "which binds to its own mapToItem for completely legitime reasons.");
87  if(m_operand2->evaluateEBV(context))
88  return item;
89  else
90  return Item();
91  }
92 
93  inline Item::Iterator::Ptr map(const Item &item,
94  const DynamicContext::Ptr &context) const
95  {
96  Q_ASSERT_X(false, Q_FUNC_INFO, "I don't expect this function to be called, for the same reasons as above.");
97  if(m_operand2->evaluateEBV(context))
98  return makeSingletonIterator(item);
99  else
101  }
102 
104  virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
105  };
106 }
107 
109 
111 
112 #endif
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
#define QT_BEGIN_HEADER
Definition: qglobal.h:136
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const
virtual SequenceType::List expectedOperandTypes() const
static const EmptyIterator< Item >::Ptr emptyIterator
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
Item::Iterator::Ptr map(const Item &item, const DynamicContext::Ptr &context) const
The namespace for the internal API of QtXmlPatterns.
A predicate that can handle all kinds of predicates and is therefore not very efficient, but can cope with all the tricky scenarios.
Item mapToItem(const Item &item, const DynamicContext::Ptr &context) const
#define Q_ASSERT_X(cond, where, what)
Definition: qglobal.h:1837
Represents an item in the XPath 2.0 Data Model.
Definition: qitem_p.h:182
TruthPredicate(const Expression::Ptr &sourceExpression, const Expression::Ptr &predicate)
A predicate which is optimized for filter expressions that are of type xs:boolean.
#define QT_END_HEADER
Definition: qglobal.h:137
The QList class is a template class that provides lists.
Definition: qdatastream.h:62
#define Q_FUNC_INFO
Definition: qglobal.h:1871