text: /****************************************************************************
  **
  ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
  ** Contact: http://www.qt-project.org/legal
  **
  ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and Digia.  For licensing terms and
  ** conditions see http://qt.digia.com/licensing.  For further information
  ** use the contact form at http://qt.digia.com/contact-us.
  **
  ** 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, Digia gives you certain additional
  ** rights.  These rights are described in the Digia Qt LGPL Exception
  ** version 1.1, 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.
  **
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  //
  //  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_Aggregator_H
  #define Patternist_Aggregator_H
  
  #include <private/qfunctioncall_p.h>
  
  QT_BEGIN_NAMESPACE
  
  namespace QPatternist
  {
  
      /**
       * @short Carries a staticType() implementation appropriate
       * for functions which returns a singleton value derived from its first argument.
       *
       * One example of such a function is FloorFN, implementing <tt>fn:floor()</tt>,
       * which returns a single value of the same type as the first argument, or the empty
       * sequence if the first argument evaluates to the empty sequence.
       *
       * Aggregator is abstract, and exists for saving code. It is inherited
       * by classes which needs the staticType() implementation this class provides.
       *
       * @see Piper
       * @ingroup Patternist_functions
       * @author Frans Englich <frans.englich@nokia.com>
       */
      class Aggregator : public FunctionCall
      {
      public:
          /**
           * @returns a static type where the ItemType is the same as this FunctionCall's first
           * argument, and the Cardinality is as return from Cardinality::toWithoutMany().
           */
          virtual SequenceType::Ptr staticType() const;
      };
  }
  
  QT_END_NAMESPACE
  
  #endif
  