////////////////////////////////////////////////////////////////////////////////
/// @brief Aql, expression
///
/// @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 Jan Steemann
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "Aql/Expression.h"
#include "Aql/Types.h"
#include "Aql/V8Executor.h"
#include "Aql/V8Expression.h"
#include "Utils/Exception.h"

using namespace triagens::aql;

// -----------------------------------------------------------------------------
// --SECTION--                                        constructors / destructors
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief create the expression
////////////////////////////////////////////////////////////////////////////////

Expression::Expression (V8Executor* executor,
                        AstNode const* node)
  : _executor(executor),
    _node(node),
    _func(nullptr) {

  TRI_ASSERT(_executor != nullptr);
  TRI_ASSERT(_node != nullptr);

  // TODO: catch return value and store in V8 persistent handle
  _func = _executor->generateExpression(node);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief destroy the expression
////////////////////////////////////////////////////////////////////////////////

Expression::~Expression () {
  if (_func != nullptr) {
    delete _func;
  }
}

// -----------------------------------------------------------------------------
// --SECTION--                                                  public functions
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief execute the expression
////////////////////////////////////////////////////////////////////////////////

AqlValue* Expression::execute (AqlItemBlock* items,
                               size_t index) {
  // TODO: implement execution
  THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
  return nullptr;
}

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------

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