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+/****************************************************************************
+**
+** Copyright (C) 2011 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_CastAs_H
+#define Patternist_CastAs_H
+
+#include "qsinglecontainer_p.h"
+#include "qcastingplatform_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+ /**
+ * @short Implements XPath 2.0's <tt>cast as</tt> expression.
+ *
+ * Implements the casting expression, such as <tt>'3' cast as xs:integer</tt>. This class also
+ * implements constructor functions, which are created in the ConstructorFunctionsFactory.
+ *
+ * CastAs uses CastingPlatform for carrying out the actual casting.
+ *
+ * @see <a href="http://www.w3.org/TR/xpath-functions/#casting">XQuery 1.0
+ * and XPath 2.0 Functions and Operators, 7 Casting</a>
+ * @see <a href="http://www.w3.org/TR/xpath20/#id-cast">XML Path Language
+ * (XPath) 2.0, 3.10.2 Cast</a>
+ * @author Frans Englich <frans.englich@nokia.com>
+ * @ingroup Patternist_expressions
+ */
+ class CastAs : public SingleContainer,
+ public CastingPlatform<CastAs, true /* issueError */>
+ {
+ public:
+
+ /**
+ * @todo Wrong/old documentation
+ *
+ * Creates a cast expression for the type @p name via the schema type
+ * factory @p factory. This function is used by parser when creating
+ * 'cast to' expressions, and the ConstructorFunctionsFactory, when creating
+ * constructor functions.
+ *
+ * @param targetType the type which the CastAs should cast to
+ * @param source the operand to evaluate and then cast from
+ */
+ CastAs(const Expression::Ptr &source,
+ const SequenceType::Ptr &targetType);
+
+ virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
+
+ virtual SequenceType::List expectedOperandTypes() const;
+
+ /**
+ * @returns a SequenceType where the ItemType is this CastAs's
+ * target type, as per targetType(), and the Cardinality is inferred from the
+ * source operand to reflect whether this CastAs always will evaluate to
+ * exactly-one or zero-or-one values.
+ */
+ virtual SequenceType::Ptr staticType() const;
+
+ /**
+ * Overridden in order to check that casting to an abstract type
+ * is not attempted.
+ */
+ virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
+ const SequenceType::Ptr &reqType);
+
+ /**
+ * If the target type is the same as the source type, it is rewritten
+ * to the operand.
+ */
+ virtual Expression::Ptr compress(const StaticContext::Ptr &context);
+ virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
+
+ inline ItemType::Ptr targetType() const
+ {
+ return m_targetType->itemType();
+ }
+
+ inline SequenceType::Ptr targetSequenceType() const
+ {
+ return m_targetType;
+ }
+
+ private:
+ /**
+ * Performs casting to @c xs:QName. This case is special, and is always done at compile time.
+ */
+ Expression::Ptr castToQName(const StaticContext::Ptr &context) const;
+
+ const SequenceType::Ptr m_targetType;
+ };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif