////////////////////////////////////////////////////////////////////////////////
/// @brief AQL range type
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Max Neunhoeffer
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "Range.h"

using namespace triagens::aql;

////////////////////////////////////////////////////////////////////////////////
/// @brief Range constructor
////////////////////////////////////////////////////////////////////////////////
      
Range::Range (int64_t low, 
              int64_t high) 
  : _low(low), 
    _high(high) {
}

////////////////////////////////////////////////////////////////////////////////
/// @brief get number of elements in Range
////////////////////////////////////////////////////////////////////////////////

size_t Range::size () const {
  if (_low <= _high) {
    // e.g. 1..1, 1..10 etc.
    return static_cast<size_t>(_high - _low + 1);
  }
  // e.g. 10..1
  return static_cast<size_t>(_low - _high + 1);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief get element at position
////////////////////////////////////////////////////////////////////////////////
      
int64_t Range::at (size_t position) const {
  if (_low <= _high) {
    // e.g. 1..1, 1..10 etc.
    return _low + static_cast<int64_t>(position);
  }

  // e.g. 10..1
  return _low - static_cast<int64_t>(position);
}

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