/******************************************************************************** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).** All rights reserved.** Contact: Nokia Corporation (qt-info@nokia.com)**** This file is part of the QtXmlPatterns module of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL$** No Commercial Usage** This file contains pre-release code and may not be distributed.** You may use this file in accordance with the terms and conditions** contained in the Technology Preview License Agreement accompanying** this package.**** GNU Lesser General Public License Usage** Alternatively, this file may be used under the terms of the GNU Lesser** General Public License version 2.1 as published by the Free Software** Foundation and appearing in the file LICENSE.LGPL included in the** packaging of this file. Please review the following information to** ensure the GNU Lesser General Public License version 2.1 requirements** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.**** In addition, as a special exception, Nokia gives you certain additional** rights. These rights are described in the Nokia Qt LGPL Exception** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.**** If you have questions regarding the use of this file, please contact** Nokia at qt-info@nokia.com.****************** $QT_END_LICENSE$******************************************************************************///// W A R N I N G// -------------//// This file is not part of the Qt API. It exists purely as an// implementation detail. This header file may change from version to// version without notice, or even be removed.//// We mean it.#ifndef Patternist_ValueComparison_H#define Patternist_ValueComparison_H#include "qatomiccomparator_p.h"#include "qpaircontainer_p.h"#include "qcomparisonplatform_p.h"QT_BEGIN_HEADERQT_BEGIN_NAMESPACEnamespace QPatternist{ /** * @short Implements XPath 2.0 value comparions, such as the <tt>eq</tt> operator. * * ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform * must access members of ValueComparison. * * @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">XML Path Language * (XPath) 2.0, 3.5.1 Value Comparisons</a> * @author Frans Englich <frans.englich@nokia.com> * @ingroup Patternist_expressions */ class ValueComparison : public PairContainer, public ComparisonPlatform<ValueComparison, true> { public: ValueComparison(const Expression::Ptr &op1, const AtomicComparator::Operator op, const Expression::Ptr &op2); virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, const SequenceType::Ptr &reqType); /** * @returns always CommonSequenceTypes::ExactlyOneBoolean */ virtual SequenceType::Ptr staticType() const; virtual SequenceType::List expectedOperandTypes() const; /** * @returns IDValueComparison */ virtual ID id() const; virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const; /** * Overridden to optimize case-insensitive compares. */ virtual Expression::Ptr compress(const StaticContext::Ptr &context); /** * @returns the operator that this ValueComparison is using. */ inline AtomicComparator::Operator operatorID() const { return m_operator; } /** * It is considered that the string value from @p op1 will be compared against @p op2. This * function determines whether the user intends the comparison to be case insensitive. If * that is the case @c true is returned, and the operands are re-written appropriately. * * This is a helper function for Expression classes that compares strings. * * @see ComparisonPlatform::useCaseInsensitiveComparator() */ static bool isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2); private: const AtomicComparator::Operator m_operator; };}QT_END_NAMESPACEQT_END_HEADER#endif