QPatternist::ByIDCreator Class Reference

Creates a particular Expression instance identified by an Expression::ID. More...

#include <qoptimizerblocks_p.h>

Inheritance diagram for QPatternist::ByIDCreator:

Public Functions
	ByIDCreator (const Expression::ID id)
virtual Expression::Ptr	create (const Expression::List &operands, const StaticContext::Ptr &context, const SourceLocationReflection *const r) const
Public Functions inherited from QPatternist::ExpressionCreator
	ExpressionCreator ()
virtual	~ExpressionCreator ()
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...

Static Public Functions
static Expression::Ptr	create (const Expression::ID id, const Expression::List &operands, const StaticContext::Ptr &context, const SourceLocationReflection *const r)

Properties
const Expression::ID	m_id

Additional Inherited Members
Public Types inherited from QPatternist::ExpressionCreator
typedef QExplicitlySharedDataPointer< ExpressionCreator >	Ptr
Public Variables inherited from QSharedData
QAtomicInt	ref

Detailed Description

Creates a particular Expression instance identified by an Expression::ID.

For example, if ByIDCreator() is passed Expression::IDCountFN, create() will return CountFN instances.

Author

Frans englich frans.nosp@m..eng.nosp@m.lich@.nosp@m.noki.nosp@m.a.com

Definition at line 197 of file qoptimizerblocks_p.h.

Constructors and Destructors

ByIDCreator()

ByIDCreator::ByIDCreator

(

const Expression::ID

id

)

Creates a ByIDCreator that creates expressions of the type that id identifies.

Definition at line 128 of file qoptimizerblocks.cpp.

                                              : m_id(id)
{
    Q_ASSERT(id != Expression::IDIgnorableExpression);
}

Functions

create() [1/2]

Expression::Ptr ByIDCreator::create ( const Expression::List &  operands, const StaticContext::Ptr &  context, const SourceLocationReflection *const  const  ) const

virtual

Creates an expression that has operands as operands.

The Expression that is returned is guaranteed, by the caller, to get a treatment identical to if the expression was created in an ordinary compilation(via the parser, and so forth). That is, Expression::typeCheck() and Expression::compress() stages will be carried out on the returned expression.

Returns

an Expression::Ptr that never is non null, valid pointer

Implements QPatternist::ExpressionCreator.

Definition at line 133 of file qoptimizerblocks.cpp.

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

{
    return create(m_id, operands, context, r);
}

create() [2/2]

Expression::Ptr ByIDCreator::create ( const Expression::ID  id, const Expression::List &  operands, const StaticContext::Ptr &  context, const SourceLocationReflection *const  r  )

static

Creates an expression by id id with the arguments operands.

Definition at line 140 of file qoptimizerblocks.cpp.

{
    Q_ASSERT(context);

    QXmlName::LocalNameCode fnName;

    switch(id)
    {
        case Expression::IDExistsFN:
        {
            fnName = StandardLocalNames::exists;
            break;
        }
        case Expression::IDEmptyFN:
        {
            fnName = StandardLocalNames::empty;
            break;
        }
        default:
        {
            Q_ASSERT_X(false, Q_FUNC_INFO,
                       "Cannot create an expression of requested type; m_id is wrong.");
            return Expression::Ptr();
        }
    }

    /* The reason we don't simply do 'new ExistsFN()' ourselves, is that all FunctionCall
     * instances needs their FunctionSignature in order to function, and the FunctionFactories
     * sets that. */
    const QXmlName qName(StandardNamespaces::fn, fnName);

    const Expression::Ptr result(context->functionSignatures()->createFunctionCall(qName, operands, context, r));
    context->wrapExpressionWith(r, result);
    return result;
}

Properties

m_id

const Expression::ID QPatternist::ByIDCreator::m_id

private

Definition at line 218 of file qoptimizerblocks_p.h.

Referenced by create().

---

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

• /src/xmlpatterns/expr/qoptimizerblocks_p.h
• /src/xmlpatterns/expr/qoptimizerblocks.cpp