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