computedexpression.hxx

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#pragma once
 
#include <rtl/ustring.hxx>
#include <com/sun/star/uno/Reference.hxx>
 
// forward declaractions
namespace com::sun::star
{
    namespace xml
    {
        namespace dom { class XNode; }
        namespace dom { class XNodeset; }
        namespace xpath { class XXPathAPI; }
        namespace xpath { class XXPathObject; }
    }
    namespace container { class XNameContainer; }
}
namespace xforms { class EvaluationContext; }
 
 
namespace xforms
{
 
class ComputedExpression
{
    OUString msExpression;
 
    bool mbIsEmpty;
 
protected:
    bool mbIsSimple;
 
    css::uno::Reference<css::xml::xpath::XXPathObject> mxResult;
 
 
    bool _checkExpression( const char* pExpression ) const;
 
    // the default implementation is to do nothing...
    const OUString& _getExpressionForEvaluation() const { return msExpression; }
 
    static css::uno::Reference<css::xml::xpath::XXPathAPI> _getXPathAPI(const xforms::EvaluationContext& aContext);
 
    bool _evaluate( const xforms::EvaluationContext& rContext,
                    const OUString& sExpression );
 
 
public:
    ComputedExpression();
    ~ComputedExpression();
 
 
    const OUString& getExpression() const { return msExpression;}
 
    void setExpression( const OUString& rExpression );
 
    bool isEmptyExpression() const { return mbIsEmpty;}
 
    bool isSimpleExpression() const;
 
 
    bool evaluate( const xforms::EvaluationContext& rContext );
 
 
    bool hasValue() const;
 
 
    void clear();
 
 
    // get the result of this expression as string/bool/...
    // (Results will be based on the last call of evaluate(..). The caller
    // must call evaluate to ensure current results.)
    css::uno::Reference<css::xml::xpath::XXPathObject> const & getXPath() const { return mxResult;}
    bool getBool( bool bDefault = false ) const;
    OUString getString() const;
 
};
 
} // namespace xforms
 
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