Qt 4.8
Public Functions | Protected Variables | List of all members
QPatternist::AddingAggregate Class Reference

Base class for the implementations of the fn:avg() and fn:sum() function. More...

#include <qaggregatefns_p.h>

Inheritance diagram for QPatternist::AddingAggregate:
QPatternist::FunctionCall QPatternist::UnlimitedContainer QPatternist::Expression QSharedData QPatternist::CppCastingHelper< Expression > QPatternist::SourceLocationReflection QPatternist::AvgFN QPatternist::SumFN

Public Functions

virtual Expression::Ptr typeCheck (const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
 
- Public Functions inherited from QPatternist::FunctionCall
virtual ExpressionVisitorResult::Ptr accept (const ExpressionVisitor::Ptr &visitor) const
 
virtual SequenceType::List expectedOperandTypes () const
 
virtual ID id () const
 
virtual Expression::Properties properties () const
 
virtual void setSignature (const FunctionSignature::Ptr &sign)
 
virtual FunctionSignature::Ptr signature () const
 
virtual SequenceType::Ptr staticType () const
 
- Public Functions inherited from QPatternist::UnlimitedContainer
virtual bool compressOperands (const StaticContext::Ptr &)
 
virtual Expression::List operands () const
 
virtual void setOperands (const Expression::List &list)
 
 UnlimitedContainer (const Expression::List &operands=Expression::List())
 
- Public Functions inherited from QPatternist::Expression
virtual const SourceLocationReflection * actualReflection () const
 Returns this. More...
 
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 Item::Iterator::Ptr evaluateSequence (const DynamicContext::Ptr &context) const
 
virtual Item evaluateSingleton (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
 
bool is (const ID id) const
 
bool isEvaluated () const
 
virtual ItemType::Ptr newFocusType () const
 
virtual QList< QExplicitlySharedDataPointer< OptimizationPass > > optimizationPasses () const
 
virtual PatternPriority patternPriority () const
 
const Expression::Ptr & rewrite (const Expression::Ptr &to, const StaticContext::Ptr &context) const
 Rewrites this Expression to to, and return to. More...
 
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 ()
 

Protected Variables

AtomicMathematician::Ptr m_mather
 
- Protected Variables inherited from QPatternist::UnlimitedContainer
Expression::List m_operands
 

Additional Inherited Members

- Public Types inherited from QPatternist::FunctionCall
typedef QExplicitlySharedDataPointer< FunctionCall > Ptr
 
- Public Types inherited from QPatternist::UnlimitedContainer
enum  CardinalityComputation { ProductOfCardinality, UnionOfCardinality }
 
- Public Types inherited from QPatternist::Expression
typedef QExplicitlySharedDataPointer< const Expression > ConstPtr
 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::Ptr > List
 
typedef QFlags< Property > Properties
 
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< Expression > Ptr
 A smart pointer wrapping mutable Expression instances. More...
 
typedef ::QAbstractXmlForwardIterator< Expression::Ptr > QAbstractXmlForwardIterator
 
typedef QVector< Expression::Ptr > Vector
 
- 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::UnlimitedContainer
template<CardinalityComputation suppliedCard>
SequenceType::Ptr operandsUnionType () const
 
- Protected Functions inherited from QPatternist::Expression
void typeCheckOperands (const StaticContext::Ptr &context)
 
- Protected Functions inherited from QPatternist::CppCastingHelper< Expression >
 CppCastingHelper ()
 

Detailed Description

Base class for the implementations of the fn:avg() and fn:sum() function.

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

Definition at line 108 of file qaggregatefns_p.h.

Functions

◆ typeCheck()

Expression::Ptr AddingAggregate::typeCheck ( const StaticContext::Ptr &  context,
const SequenceType::Ptr &  reqType 
)
virtual

This implementation guarantees to never rewrite away this Expression, but at most rewrite it as a child of another expression(that presumably have a type checking role). It is therefore always safe to override this function and call this implementation and not worry about that this Expression becomes deleted.

Many Expressions override typeCheck() and performs optimizations, as opposed to doing it in the compress() stage. This is due to that the design of those Expressions often are tied to that certain simplifications are done at the typeCheck() stage of the compilation process or that it in some other way is related to what the typeCheck() do. Also, the earlier the AST can be simplified, the better the chances are for subsequent optimizations.

It is important that the super class's typeCheck() is called before doing any custom type checking, since the call can change the children(notably, the childrens' static types). For example, if the Expression, MyExpression in the example, does not match the required type, typeCheck returns the Expression wrapped in for example ItemVerifier, CardinalityVerifier, or both.

typeCheck() may be called many times. typeCheck() must either raise an error if this Expression is an invalid expression. Thus, it is guaranteed that an Expression is valid after typeCheck() is called.

Parameters
contextsupplies information, such as namespace bindings and available function signatures, that can be needed at compilation time. context is guaranteed by the caller to never null.
reqTypethe static type that this Expression must match when evaluated. reqType is guaranteed by the caller to never null.
Returns
an Expression that can be this Expression, or another expression, which somehow is necessary for making this Expression conforming to reqType

Reimplemented from QPatternist::FunctionCall.

Reimplemented in QPatternist::SumFN, and QPatternist::AvgFN.

Definition at line 98 of file qaggregatefns.cpp.

Referenced by QPatternist::SumFN::typeCheck().

100 {
101  const Expression::Ptr me(FunctionCall::typeCheck(context, reqType));
102  ItemType::Ptr t1(m_operands.first()->staticType()->itemType());
103 
104  if(*CommonSequenceTypes::Empty == *t1)
105  return me;
106  else if(*BuiltinTypes::xsAnyAtomicType == *t1 ||
107  *BuiltinTypes::numeric == *t1)
108  return me;
109  else if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1))
110  {
111  m_operands.replace(0, Expression::Ptr(new UntypedAtomicConverter(m_operands.first(),
112  BuiltinTypes::xsDouble)));
113  t1 = m_operands.first()->staticType()->itemType();
114  }
115  else if(!BuiltinTypes::numeric->xdtTypeMatches(t1) &&
116  !BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t1) &&
117  !BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t1))
118  {
119  /* Translator, don't translate the type names. */
120  context->error(QtXmlPatterns::tr("The first argument to %1 cannot be "
121  "of type %2. It must be a numeric "
122  "type, xs:yearMonthDuration or "
123  "xs:dayTimeDuration.")
124  .arg(formatFunction(context->namePool(), signature()))
125  .arg(formatType(context->namePool(),
126  m_operands.first()->staticType())),
127  ReportContext::FORG0006, this);
128  }
129 
130  if(!m_operands.first()->staticType()->cardinality().allowsMany())
131  return m_operands.first();
132 
133  /* We know fetchMathematician won't attempt a rewrite of the operand, so this is safe. */
134  m_mather = ArithmeticExpression::fetchMathematician(m_operands.first(), m_operands.first(),
135  AtomicMathematician::Add, true, context,
136  this,
137  ReportContext::FORG0006);
138  return me;
139 }
QPatternist::FunctionCall::typeCheck
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
Definition: qfunctioncall.cpp:71
QPatternist::BuiltinTypes::xsDayTimeDuration
static const AtomicType::Ptr xsDayTimeDuration
Definition: qbuiltintypes_p.h:90
QPatternist::formatType
QString formatType(const NamePool::Ptr &np, const T &type)
Formats ItemType and SequenceType.
Definition: qpatternistlocale_p.h:160
QPatternist::AddingAggregate::m_mather
AtomicMathematician::Ptr m_mather
Definition: qaggregatefns_p.h:114
QPatternist::StaticContext::namePool
virtual NamePool::Ptr namePool() const =0
QPatternist::BuiltinTypes::xsYearMonthDuration
static const AtomicType::Ptr xsYearMonthDuration
Definition: qbuiltintypes_p.h:89
QPatternist::ReportContext::error
void error(const QString &message, const ReportContext::ErrorCode errorCode, const QSourceLocation &sourceLocation)
Definition: qreportcontext.cpp:81
QPatternist::formatFunction
static QString formatFunction(const NamePool::Ptr &np, const FunctionSignature::Ptr &func)
Formats FunctionSignature.
Definition: qfunctionsignature_p.h:201
QPatternist::BuiltinTypes::xsDouble
static const AtomicType::Ptr xsDouble
Definition: qbuiltintypes_p.h:98
QPatternist::FunctionCall::signature
virtual FunctionSignature::Ptr signature() const
Definition: qfunctioncall.cpp:114
QPatternist::SequenceType::cardinality
virtual Cardinality cardinality() const =0
QList::replace
void replace(int i, const T &t)
Replaces the item at index position i with value.
Definition: qlist.h:609
QPatternist::BuiltinTypes::xsUntypedAtomic
static const AtomicType::Ptr xsUntypedAtomic
Definition: qbuiltintypes_p.h:84
QList::first
T & first()
Returns a reference to the first item in the list.
Definition: qlist.h:282
QPatternist::ArithmeticExpression::fetchMathematician
static AtomicMathematician::Ptr fetchMathematician(Expression::Ptr &t1, Expression::Ptr &t2, const AtomicMathematician::Operator op, const bool issueError, const ReportContext::Ptr &context, const SourceLocationReflection *const reflection, const ReportContext::ErrorCode code=ReportContext::XPTY0004, const bool isCompat=false)
Definition: qarithmeticexpression.cpp:169
QPatternist::Expression::staticType
virtual SequenceType::Ptr staticType() const =0
QPatternist::CommonSequenceTypes::Empty
static const EmptySequenceType::Ptr Empty
Definition: qcommonsequencetypes_p.h:111
QPatternist::BuiltinTypes::numeric
static const AtomicType::Ptr numeric
Definition: qbuiltintypes_p.h:96
QPatternist::UntypedAtomicConverter
Casts every item in a sequence obtained from evaluating an Expression, to a requested atomic type...
Definition: quntypedatomicconverter_p.h:80
QPatternist::BuiltinTypes::xsAnyAtomicType
static const AtomicType::Ptr xsAnyAtomicType
Definition: qbuiltintypes_p.h:83
QPatternist::SequenceType::itemType
virtual ItemType::Ptr itemType() const =0

Properties

◆ m_mather

AtomicMathematician::Ptr QPatternist::AddingAggregate::m_mather
protected

Definition at line 114 of file qaggregatefns_p.h.

The documentation for this class was generated from the following files:
Qt 4.8 Source Code Browser