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