121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#include <rtl/ustring.hxx>
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#include <com/sun/star/uno/Reference.hxx>
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// forward declarations
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namespace com::sun::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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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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css::uno::Reference<css::xml::xpath::XXPathObject> mxResult;
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/// implementation of isSimpleExpression
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bool _checkExpression( const char* pExpression ) const;
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/// allow manipulation of the expression before it is evaluated
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// the default implementation is to do nothing...
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const OUString& _getExpressionForEvaluation() const { return msExpression; }
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/// obtain a (suitable) XPathAPI implementation
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static css::uno::Reference<css::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 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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const OUString& getExpression() const { return msExpression;}
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/// set a new expression string
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void setExpression( const OUString& rExpression );
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/// do we have an actual expression?
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bool isEmptyExpression() const { return mbIsEmpty;}
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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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css::uno::Reference<css::xml::xpath::XXPathObject> const & getXPath() const { return mxResult;}
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bool getBool( bool bDefault = false ) const;
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OUString getString() const;
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};
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} // namespace xforms
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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