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27 
28 #ifndef _PATHEXPRESSION_HXX
29 #define _PATHEXPRESSION_HXX
30 
31 
32 // include for parent class
33 #include "computedexpression.hxx"
34 
35 // includes for member variables
36 #include <vector>
37 
38 // forward declaractions
39 namespace com { namespace sun { namespace star
40 {
41     namespace xml { namespace dom
42     {
43         class XNodeList;
44         namespace events { class XEventListener; }
45     } }
46 } } }
47 
48 
49 
50 namespace xforms
51 {
52 
53 /** PathExpression represents an XPath Expression and caches results */
54 class PathExpression : public ComputedExpression
55 {
56 public:
57     typedef std::vector<com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> > NodeVector_t;
58 
59 private:
60     /// the node-list result from the last bind (cached from mxResult)
61     NodeVector_t maNodes;
62 
63 protected:
64     /// get expression for evaluation
65     const rtl::OUString _getExpressionForEvaluation() const;
66 
67 
68 public:
69     PathExpression();
70     ~PathExpression();
71 
72     /// set the expression string
73     /// (overridden to do remove old listeners)
74     /// (also defines simple expressions)
75     void setExpression( const rtl::OUString& rExpression );
76 
77 
78     /// evaluate the expression relative to the content node.
79     bool evaluate( const xforms::EvaluationContext& rContext );
80 
81 
82     // get the result of this expression as node/node list/...
83     com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> getNode() const;
84     const NodeVector_t getNodeList() const;
85     com::sun::star::uno::Reference<com::sun::star::xml::dom::XNodeList> getXNodeList() const;
86 
87 };
88 
89 } // namespace xforms
90 
91 #endif
92