Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@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_AggregateFNs_H
+#define Patternist_AggregateFNs_H
+
+#include "qaggregator_p.h"
+#include "qatomiccomparator_p.h"
+#include "qatomicmathematician_p.h"
+#include "qcomparisonplatform_p.h"
+
+/**
+ * @file
+ * @short Contains classes implementing the functions found in
+ * <a href="http://www.w3.org/TR/xpath-functions/#aggregate-functions">XQuery 1.0 and
+ * XPath 2.0 Functions and Operators, 15.4 Aggregate Functions</a>.
+ *
+ * @todo document that some functions have both eval funcs implented.
+ *
+ * @ingroup Patternist_functions
+ */
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Implements the function <tt>fn:count()</tt>.
+     *
+     * @ingroup Patternist_functions
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class CountFN : public FunctionCall
+    {
+    public:
+        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
+
+        /**
+         * If @p reqType is CommonSequenceTypes::EBV, this function call is rewritten
+         * into a call to <tt>fn:exists()</tt>. Hence, <tt>if(count(X)) then ...</tt> is
+         * rewritten into <tt>if(exists(X)) then ...</tt>.
+         */
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+        /**
+         * If CountFN's operand has a Cardinality that is exact, as per Cardinality::isExact(),
+         * it is rewritten to the Cardinality's count.
+         */
+        virtual Expression::Ptr compress(const StaticContext::Ptr &context);
+    };
+
+    /**
+     * @short Base class for the implementations of the <tt>fn:avg()</tt> and <tt>fn:sum()</tt> function.
+     *
+     * @ingroup Patternist_functions
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class AddingAggregate : public FunctionCall
+    {
+    public:
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+    protected:
+        AtomicMathematician::Ptr m_mather;
+    };
+
+    /**
+     * @short Implements the function <tt>fn:avg()</tt>.
+     *
+     * @ingroup Patternist_functions
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class AvgFN : public AddingAggregate
+    {
+    public:
+        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+
+        virtual SequenceType::Ptr staticType() const;
+    private:
+        AtomicMathematician::Ptr m_adder;
+        AtomicMathematician::Ptr m_divider;
+    };
+
+    /**
+     * @short Implements the function <tt>fn:sum()</tt>.
+     *
+     * @ingroup Patternist_functions
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class SumFN : public AddingAggregate
+    {
+    public:
+        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
+        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+                                          const SequenceType::Ptr &reqType);
+        virtual SequenceType::Ptr staticType() const;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif