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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: computedexpression.hxx,v $
* $Revision: 1.5 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef _COMPUTEDEXPRESSION_HXX
#define _COMPUTEDEXPRESSION_HXX
// includes for member variables
#include <rtl/ustring.hxx>
#include <com/sun/star/uno/Reference.hxx>
// forward declaractions
namespace com { namespace sun { namespace 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
{
/** ComputedExpression represents an XPath Expression and caches results.
*
* As this class has no virtual methods, it should never be used
* polymorphically. */
class ComputedExpression
{
/// the expression string
rtl::OUString msExpression;
/// is msExpression empty?
bool mbIsEmpty;
protected:
/// is msExpression a simple expression?
bool mbIsSimple;
/// the result from the last bind
com::sun::star::uno::Reference<com::sun::star::xml::xpath::XXPathObject> mxResult;
/// implementation of isSimpleExpression
bool _checkExpression( const sal_Char* pExpression ) const;
/// allow manipulation of the expression before it is evaluated
const rtl::OUString _getExpressionForEvaluation() const;
/// obtain a (suitable) XPathAPI implementation
com::sun::star::uno::Reference<com::sun::star::xml::xpath::XXPathAPI> _getXPathAPI(const xforms::EvaluationContext& aContext);
/// evaluate the expression relative to the content node.
bool _evaluate( const xforms::EvaluationContext& rContext,
const rtl::OUString& sExpression );
public:
ComputedExpression();
~ComputedExpression();
/// get the expression string
rtl::OUString getExpression() const;
/// set a new expression string
void setExpression( const rtl::OUString& rExpression );
/// get the namespaces that are used to interpret the expression string
com::sun::star::uno::Reference<com::sun::star::container::XNameContainer> getNamespaces() const;
/// set the namespaces that are used to interpret the expression string
void setNamespaces( const com::sun::star::uno::Reference<com::sun::star::container::XNameContainer>& );
/// do we have an actual expression?
bool isEmptyExpression() const;
/// heuristically determine whether this expression is 'simple',
/// i.e. whether its value will change depending on the values
/// of other nodes
bool isSimpleExpression() const;
/// evaluate the expression relative to the content node.
bool evaluate( const xforms::EvaluationContext& rContext );
/// does this expression have a value?
bool hasValue() const;
/// remove value/evaluate results
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.)
com::sun::star::uno::Reference<com::sun::star::xml::xpath::XXPathObject> getXPath();
bool getBool( bool bDefault = false ) const;
rtl::OUString getString( const rtl::OUString& rDefault = rtl::OUString() ) const;
};
} // namespace xforms
#endif
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