--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/expr/qcomparisonplatform_p.h Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,208 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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_ComparisonPlatform_H
+#define Patternist_ComparisonPlatform_H
+
+#include "qatomiccomparators_p.h"
+#include "qitem_p.h"
+#include "qcommonsequencetypes_p.h"
+#include "qdynamiccontext_p.h"
+#include "qbuiltintypes_p.h"
+#include "qitemtype_p.h"
+#include "qpatternistlocale_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+ /**
+ * @short Provides comparison functionality for classes that compare Items,
+ * such as ValueComparison or MaxFN.
+ *
+ * Classes which need comparison functionalities should inherit from this class.
+ *
+ * The parameter of this template class is the class inheriting from ComparisonPlatform.
+ *
+ * The class inheriting ComparisonPlatform must implement the following function:
+ * @code
+ * AtomicComparator::Operator operatorID() const
+ * @endcode
+ *
+ * @author Vincent Ricard <magic@magicninja.org>
+ * @ingroup Patternist_expressions
+ */
+ template <typename TSubClass,
+ bool issueError,
+ AtomicComparator::ComparisonType comparisonType = AtomicComparator::AsValueComparison,
+ ReportContext::ErrorCode errorCode = ReportContext::XPTY0004>
+ class ComparisonPlatform
+ {
+ protected:
+ /**
+ * Makes ComparisonPlatform use the AtomicComparator @p comparator.
+ */
+ void prepareComparison(const AtomicComparator::Ptr &comparator);
+
+ /**
+ * Default constructor. Does nothing. It is implemented in order make template
+ * instantiation easier.
+ */
+ inline ComparisonPlatform()
+ {
+ }
+
+ /**
+ * Utility function for fetching the appropriate AtomicComparator
+ * for two atomic values of type @p type1 and @p type2, for the operator @p op.
+ *
+ * This function is used throughout the implementation, ranging from the ValueComparison
+ * itself, to for example the aggregate functions.
+ *
+ * @param context the ordinary ReportContext, used for issuing errors.
+ * @param type1 the type of the first operand value in a comparison for which the
+ * returned AtomicComparator is intended for
+ * @param type2 the type of the second operand value in a comparison for which the
+ * returned AtomicComparator is intended for. Whether @p type1 and @p type2 corresponds
+ * to what is the first second operand type does not have significance, the order
+ * can be arbitrary
+ */
+ AtomicComparator::Ptr
+ fetchComparator(const ItemType::Ptr &type1,
+ const ItemType::Ptr &type2,
+ const ReportContext::Ptr &context) const;
+
+ /**
+ * @short Compares @p i1 and @p i2 with operator @p op, using comparator @p
+ * comp. All input arguments must be valid, and not @c null.
+ *
+ * This is a fast, raw function which has the requirement that the
+ * caller knows what to compare and with what.
+ */
+ bool compare(const Item &i1,
+ const Item &i2,
+ const AtomicComparator::Ptr &comp,
+ const AtomicComparator::Operator op) const;
+
+ /**
+ * @short Compares @p it1 against @p it2, using comparator() and operatorID().
+ *
+ * If the comparator wasn't looked up at compile time, it will be
+ * attempted before comparing. If this fails, errors are reported via
+ * @p context.
+ */
+ bool
+ flexibleCompare(const Item &it1,
+ const Item &it2,
+ const DynamicContext::Ptr &context) const;
+
+ /**
+ * @short like flexibleCompare(), but returns the result
+ * as an AtomicComparator::Operator instead of @c bool.
+ *
+ * This is useful when it is significant how a less than comparison
+ * fails; whether the two values are equal or greater than.
+ */
+ AtomicComparator::ComparisonResult
+ detailedFlexibleCompare(const Item &it1,
+ const Item &it2,
+ const DynamicContext::Ptr &context) const;
+
+ /**
+ * @returns the AtomicComparator that has been allocated at compile time,
+ * with prepareComparison(). If no AtomicComparator has been allocated
+ * for some reason, this function returns @c null.
+ */
+ inline const AtomicComparator::Ptr &comparator() const
+ {
+ return m_comparator;
+ }
+
+ /**
+ * Calling this function makes ComparisonPlatform use a comparator that
+ * compares strings case insensitively.
+ *
+ * @see ValueComparison::isCaseInsensitiveCompare()
+ */
+ inline void useCaseInsensitiveComparator()
+ {
+ m_comparator = AtomicComparator::Ptr(new CaseInsensitiveStringComparator());
+ }
+
+ private:
+ /**
+ * @returns the operator that is used.
+ */
+ inline AtomicComparator::Operator operatorID() const
+ {
+ Q_ASSERT(static_cast<const TSubClass *>(this)->operatorID());
+ return static_cast<const TSubClass *>(this)->operatorID();
+ }
+
+ /**
+ * The comparator that is used for comparing atomic values. The AtomicComparator
+ * that is used, depends on the static type of the operands. m_comparator can be
+ * @c null if it wasn't possible to determine what comparator to use at compile time.
+ */
+ AtomicComparator::Ptr m_comparator;
+ };
+
+#include "qcomparisonplatform.cpp"
+
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif