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#ifndef _PATHEXPRESSION_HXX
#define _PATHEXPRESSION_HXX


// include for parent class
#include "computedexpression.hxx"

// includes for member variables
#include <vector>

// forward declaractions
namespace com { namespace sun { namespace star
{
    namespace xml { namespace dom
    {
        class XNodeList;
        namespace events { class XEventListener; }
    } }
} } }



namespace xforms
{

/** PathExpression represents an XPath Expression and caches results */
class PathExpression : public ComputedExpression
{
public:
    typedef std::vector<com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> > NodeVector_t;

private:
    /// the node-list result from the last bind (cached from mxResult)
    NodeVector_t maNodes;

protected:
    /// get expression for evaluation
    const rtl::OUString _getExpressionForEvaluation() const;


public:
    PathExpression();
    ~PathExpression();

    /// set the expression string
    /// (overridden to do remove old listeners)
    /// (also defines simple expressions)
    void setExpression( const rtl::OUString& rExpression );


    /// evaluate the expression relative to the content node.
    bool evaluate( const xforms::EvaluationContext& rContext );


    // get the result of this expression as node/node list/...
    com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> getNode() const;
    const NodeVector_t getNodeList() const;
    com::sun::star::uno::Reference<com::sun::star::xml::dom::XNodeList> getXNodeList() const;

};

} // namespace xforms

#endif
