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21 
22 
23 
24 #ifndef _PATHEXPRESSION_HXX
25 #define _PATHEXPRESSION_HXX
26 
27 
28 // include for parent class
29 #include "computedexpression.hxx"
30 
31 // includes for member variables
32 #include <vector>
33 
34 // forward declaractions
35 namespace com { namespace sun { namespace star
36 {
37     namespace xml { namespace dom
38     {
39         class XNodeList;
40         namespace events { class XEventListener; }
41     } }
42 } } }
43 
44 
45 
46 namespace xforms
47 {
48 
49 /** PathExpression represents an XPath Expression and caches results */
50 class PathExpression : public ComputedExpression
51 {
52 public:
53     typedef std::vector<com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> > NodeVector_t;
54 
55 private:
56     /// the node-list result from the last bind (cached from mxResult)
57     NodeVector_t maNodes;
58 
59 protected:
60     /// get expression for evaluation
61     const rtl::OUString _getExpressionForEvaluation() const;
62 
63 
64 public:
65     PathExpression();
66     ~PathExpression();
67 
68     /// set the expression string
69     /// (overridden to do remove old listeners)
70     /// (also defines simple expressions)
71     void setExpression( const rtl::OUString& rExpression );
72 
73 
74     /// evaluate the expression relative to the content node.
75     bool evaluate( const xforms::EvaluationContext& rContext );
76 
77 
78     // get the result of this expression as node/node list/...
79     com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> getNode() const;
80     const NodeVector_t getNodeList() const;
81     com::sun::star::uno::Reference<com::sun::star::xml::dom::XNodeList> getXNodeList() const;
82 
83 };
84 
85 } // namespace xforms
86 
87 #endif
88