Qt 4.8
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QPatternist::ItemVerifier Class Reference

Verifies that the items in a sequence an Expression evaluates is of a certain ItemType. More...

#include <qitemverifier_p.h>

Inheritance diagram for QPatternist::ItemVerifier:
QPatternist::SingleContainer QPatternist::Expression QSharedData QPatternist::CppCastingHelper< Expression > QPatternist::SourceLocationReflection

Public Functions

virtual ExpressionVisitorResult::Ptr accept (const ExpressionVisitor::Ptr &visitor) const
 
virtual const SourceLocationReflectionactualReflection () const
 Returns this. More...
 
virtual Item::Iterator::Ptr evaluateSequence (const DynamicContext::Ptr &) const
 
virtual Item evaluateSingleton (const DynamicContext::Ptr &) const
 
virtual SequenceType::List expectedOperandTypes () const
 
 ItemVerifier (const Expression::Ptr &operand, const ItemType::Ptr &reqType, const ReportContext::ErrorCode errorCode)
 
Item mapToItem (const Item &, const DynamicContext::Ptr &) const
 
virtual SequenceType::Ptr staticType () const
 
- Public Functions inherited from QPatternist::SingleContainer
virtual bool compressOperands (const StaticContext::Ptr &)
 
virtual Expression::List operands () const
 
virtual void setOperands (const Expression::List &operands)
 
- Public Functions inherited from QPatternist::Expression
virtual void announceFocusType (const ItemType::Ptr &itemType)
 
virtual Expression::Ptr compress (const StaticContext::Ptr &context)
 
Properties deepProperties () const
 Computes the union of properties for this Expression and all its descending children. More...
 
virtual Properties dependencies () const
 
virtual QString description () const
 
virtual bool evaluateEBV (const DynamicContext::Ptr &context) const
 
virtual void evaluateToSequenceReceiver (const DynamicContext::Ptr &context) const
 
virtual ItemType::Ptr expectedContextItemType () const
 
 Expression ()
 
bool has (const Property prop) const
 
bool hasDependency (const Property prop) const
 
virtual ID id () const
 
bool is (const ID id) const
 
bool isEvaluated () const
 
virtual ItemType::Ptr newFocusType () const
 
virtual QList< QExplicitlySharedDataPointer< OptimizationPass > > optimizationPasses () const
 
virtual PatternPriority patternPriority () const
 
virtual Properties properties () const
 
const Expression::Ptrrewrite (const Expression::Ptr &to, const StaticContext::Ptr &context) const
 Rewrites this Expression to to, and return to. More...
 
virtual Expression::Ptr typeCheck (const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
 
virtual ~Expression ()
 
- Public Functions inherited from QSharedData
 QSharedData ()
 Constructs a QSharedData object with a reference count of 0. More...
 
 QSharedData (const QSharedData &)
 Constructs a QSharedData object with reference count 0. More...
 
- Public Functions inherited from QPatternist::CppCastingHelper< Expression >
const TCastTarget * as () const
 
TCastTarget * as ()
 
- Public Functions inherited from QPatternist::SourceLocationReflection
virtual QSourceLocation sourceLocation () const
 
 SourceLocationReflection ()
 
virtual ~SourceLocationReflection ()
 

Private Types

typedef QExplicitlySharedDataPointer< const ItemVerifierConstPtr
 

Private Functions

void verifyItem (const Item &item, const DynamicContext::Ptr &context) const
 

Properties

const ReportContext::ErrorCode m_errorCode
 
const ItemType::Ptr m_reqType
 

Additional Inherited Members

- Public Types inherited from QPatternist::Expression
typedef QExplicitlySharedDataPointer< const ExpressionConstPtr
 A smart pointer wrapping const Expression instances. More...
 
enum  ID {
  IDBooleanValue = 1, IDCountFN, IDEmptyFN, IDExistsFN,
  IDExpressionSequence, IDGeneralComparison, IDIfThenClause, IDIgnorableExpression,
  IDIntegerValue, IDPositionFN, IDStringValue, IDValueComparison,
  IDRangeVariableReference, IDContextItem, IDUserFunctionCallsite, IDExpressionVariableReference,
  IDAttributeConstructor, IDUpperCaseFN, IDLowerCaseFN, IDFirstItemPredicate,
  IDEmptySequence, IDReturnOrderBy, IDLetClause, IDForClause,
  IDPath, IDNamespaceConstructor, IDArgumentReference, IDGenericPredicate,
  IDAxisStep, IDFloat, IDCombineNodes, IDUnresolvedVariableReference,
  IDCardinalityVerifier
}
 
typedef QList< Expression::PtrList
 
typedef QFlags< PropertyProperties
 
enum  Property {
  UseContextItem = 1, DisableElimination = 1 << 1, IsEvaluated = 1 << 2, DisableTypingDeduction = 1 << 3,
  EmptynessFollowsChild = 1 << 4, RewriteToEmptyOnEmpty = 1 << 5, RequiresFocus = 1 << 6, AffectsOrderOnly = 1 << 7,
  RequiresContextItem = (1 << 8) | RequiresFocus, CreatesFocusForLast = 1 << 9, LastOperandIsCollation = 1 << 10, DependsOnLocalVariable = (1 << 11) | DisableElimination,
  EvaluationCacheRedundant = (1 << 12), IsNodeConstructor = 1 << 13, RequiresCurrentItem = 1 << 14
}
 
typedef QExplicitlySharedDataPointer< ExpressionPtr
 A smart pointer wrapping mutable Expression instances. More...
 
typedef ::QAbstractXmlForwardIterator< Expression::PtrQAbstractXmlForwardIterator
 
typedef QVector< Expression::PtrVector
 
- Static Public Functions inherited from QPatternist::Expression
static void rewrite (Expression::Ptr &old, const Expression::Ptr &New, const StaticContext::Ptr &context)
 
- Public Variables inherited from QSharedData
QAtomicInt ref
 
- Protected Functions inherited from QPatternist::SingleContainer
 SingleContainer (const Expression::Ptr &operand)
 
- Protected Functions inherited from QPatternist::Expression
void typeCheckOperands (const StaticContext::Ptr &context)
 
- Protected Functions inherited from QPatternist::CppCastingHelper< Expression >
 CppCastingHelper ()
 
- Protected Variables inherited from QPatternist::SingleContainer
Expression::Ptr m_operand
 

Detailed Description

Verifies that the items in a sequence an Expression evaluates is of a certain ItemType.

Author
Frans Englich frans.nosp@m..eng.nosp@m.lich@.nosp@m.noki.nosp@m.a.com

Definition at line 71 of file qitemverifier_p.h.

Typedefs

◆ ConstPtr

Definition at line 90 of file qitemverifier_p.h.

Constructors and Destructors

◆ ItemVerifier()

ItemVerifier::ItemVerifier ( const Expression::Ptr operand,
const ItemType::Ptr reqType,
const ReportContext::ErrorCode  errorCode 
)

Definition at line 53 of file qitemverifier.cpp.

55  : SingleContainer(operand),
56  m_reqType(reqType),
57  m_errorCode(errorCode)
58 {
59  Q_ASSERT(reqType);
60 }
#define Q_ASSERT(cond)
Definition: qglobal.h:1823
SingleContainer(const Expression::Ptr &operand)
const ItemType::Ptr m_reqType
const ReportContext::ErrorCode m_errorCode

Functions

◆ accept()

ExpressionVisitorResult::Ptr ItemVerifier::accept ( const ExpressionVisitor::Ptr visitor) const
virtual

Implements QPatternist::Expression.

Definition at line 117 of file qitemverifier.cpp.

118 {
119  return visitor->visit(this);
120 }

◆ actualReflection()

const SourceLocationReflection * ItemVerifier::actualReflection ( ) const
virtual

Returns this.

Reimplemented from QPatternist::Expression.

Definition at line 74 of file qitemverifier.cpp.

75 {
76  return m_operand->actualReflection();
77 }
virtual const SourceLocationReflection * actualReflection() const
Returns this.

◆ evaluateSequence()

Item::Iterator::Ptr ItemVerifier::evaluateSequence ( const DynamicContext::Ptr context) const
virtual

Evaluate this Expression by iterating over it. This is a central function for evaluating expressions.

Expressions must always always return a valid QAbstractXmlForwardIterator and may never return 0. If an empty result is of interest to be returned, the EmptyIterator should be returned.

The default implementation returns a SingletonIterator over the item returned from evaluateSingleton().

Note
This function may raise an exception when calling, not only when QAbstractXmlForwardIterator::next() is called on the return value. This is because in some cases evaluateSingleton() is called directly.

Reimplemented from QPatternist::Expression.

Definition at line 98 of file qitemverifier.cpp.

99 {
100  return makeItemMappingIterator<Item>(ConstPtr(this),
101  m_operand->evaluateSequence(context),
102  context);
103 }
QExplicitlySharedDataPointer< const ItemVerifier > ConstPtr
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const

◆ evaluateSingleton()

Item ItemVerifier::evaluateSingleton ( const DynamicContext::Ptr context) const
virtual

Reimplemented from QPatternist::Expression.

Definition at line 79 of file qitemverifier.cpp.

80 {
81  const Item item(m_operand->evaluateSingleton(context));
82 
83  if(item)
84  {
85  verifyItem(item, context);
86  return item;
87  }
88  else
89  return Item();
90 }
Represents an item in the XPath 2.0 Data Model.
Definition: qitem_p.h:182
void verifyItem(const Item &item, const DynamicContext::Ptr &context) const
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const

◆ expectedOperandTypes()

SequenceType::List ItemVerifier::expectedOperandTypes ( ) const
virtual

Returns a list of Sequence Types, describing the type of each of the expression's operands. Hence, this function has a relationship to the operands() function:

- The lengths of the lists returned by expectedOperandTypes()
and operands() should always be equal in length, since one
cannot describe the type of a non-existent operand(and all
operands must have type information).
- A significant difference between the two functions is that while
the type of objects in the list returned by operands() may vary
between compilations/static context, simply because the particular
Expression is part of different XPath expressions, the
types in the list returned by expectedOperandTypes is always the same
since the function/operator signature never changes.

This function should not be confused with staticType(), which returns the static type of the expression itself, not its operands. The function call is an expression where this is clear: the type of the return value is not the same as the arguments' types. The static type of the operands supplied to the expression can be determined via the staticType() function of the instances returned by operands().

If the expression has no operands, an empty list should be returned.

Implements QPatternist::Expression.

Definition at line 110 of file qitemverifier.cpp.

111 {
112  SequenceType::List result;
114  return result;
115 }
static const SequenceType::Ptr ZeroOrMoreItems
void append(const T &t)
Inserts value at the end of the list.
Definition: qlist.h:507
The QList class is a template class that provides lists.
Definition: qdatastream.h:62

◆ mapToItem()

Item ItemVerifier::mapToItem ( const Item item,
const DynamicContext::Ptr context 
) const
inline

Definition at line 92 of file qitemverifier.cpp.

93 {
94  verifyItem(item, context);
95  return item;
96 }
void verifyItem(const Item &item, const DynamicContext::Ptr &context) const

◆ staticType()

SequenceType::Ptr ItemVerifier::staticType ( ) const
virtual
Returns
the static type of this Expression. For example, an 'and' expression have as static type xs:boolean

Implements QPatternist::Expression.

Definition at line 105 of file qitemverifier.cpp.

106 {
107  return makeGenericSequenceType(m_reqType, m_operand->staticType()->cardinality());
108 }
const ItemType::Ptr m_reqType
virtual Cardinality cardinality() const =0
virtual SequenceType::Ptr staticType() const =0

◆ verifyItem()

void ItemVerifier::verifyItem ( const Item item,
const DynamicContext::Ptr context 
) const
inlineprivate

Definition at line 62 of file qitemverifier.cpp.

Referenced by evaluateSingleton(), and mapToItem().

63 {
64  if(m_reqType->itemMatches(item))
65  return;
66 
67  context->error(QtXmlPatterns::tr("The item %1 did not match the required type %2.")
68  .arg(formatData(item.stringValue()),
69  formatType(context->namePool(), m_reqType)),
71  this);
72 }
virtual NamePool::Ptr namePool() const =0
QString formatType(const NamePool::Ptr &np, const T &type)
Formats ItemType and SequenceType.
virtual bool itemMatches(const Item &item) const =0
const ItemType::Ptr m_reqType
void error(const QString &message, const ReportContext::ErrorCode errorCode, const QSourceLocation &sourceLocation)
QString stringValue() const
Returns the string value of this Item.
Definition: qitem_p.h:302
static QString formatData(const QString &data)
const ReportContext::ErrorCode m_errorCode

Properties

◆ m_errorCode

const ReportContext::ErrorCode QPatternist::ItemVerifier::m_errorCode
private

Definition at line 95 of file qitemverifier_p.h.

Referenced by verifyItem().

◆ m_reqType

const ItemType::Ptr QPatternist::ItemVerifier::m_reqType
private

Definition at line 94 of file qitemverifier_p.h.

Referenced by staticType(), and verifyItem().


The documentation for this class was generated from the following files: