source: trunk/src/xmlpatterns/expr/qoptimizerblocks_p.h@ 1168

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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_OptimizerBlocks_H
#define Patternist_OptimizerBlocks_H

#include "qatomiccomparator_p.h"
#include "qexpression_p.h"
#include "qoptimizerframework_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Identifies Expression instances by their Expression::id().
     *
     * @author Frans englich <[email protected]>
     * @ingroup Patternist_expressions
     */
    class ByIDIdentifier : public ExpressionIdentifier
    {
    public:
        ByIDIdentifier(const Expression::ID id);
        virtual bool matches(const Expression::Ptr &expr) const;
    private:
        const Expression::ID m_id;
    };

    /**
     * @short Identifies Expression instances based on their static type.
     *
     * BySequenceTypeIdentifier identifies Expression instances
     * if their Expression::staticType() matches the requested one,
     * regardless of whether the Expression is a particular one, such
     * as AndExpression.
     *
     * For example, constructing a BySequenceTypeIdentifier while
     * passing CommonSequenceTypes::EBV in its constructor will create
     * a ExpressionIdentifier that returns @c true for a static type with
     * item type <tt>xs:string</tt>, but returns @c false for a static type involving
     * <tt>xs:date</tt>.
     *
     * @author Frans englich <[email protected]>
     * @ingroup Patternist_expressions
     */
    class BySequenceTypeIdentifier : public ExpressionIdentifier
    {
    public:
        BySequenceTypeIdentifier(const SequenceType::Ptr &seqType);

        /**
         * @returns @c true, if the static type of @p expr is matches
         * the SequenceType passed in the BySequenceTypeIdentifier()