////////////////////////////////////////////////////////////////////////////////
/// @brief Fundamental objects for the execution of AQL queries
///
/// @file arangod/Aql/Types.cpp
///
/// DISCLAIMER
///
/// Copyright 2010-2014 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 triAGENS GmbH, Cologne, Germany
///
/// @author Max Neunhoeffer
/// @author Copyright 2014, triagens GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "Aql/Types.h"

using namespace triagens::aql;
using Json = triagens::basics::Json;

////////////////////////////////////////////////////////////////////////////////
/// @brief destructor
////////////////////////////////////////////////////////////////////////////////

AqlValue::~AqlValue () {
  switch (_type) {
    case JSON: {
      delete _json;
      return;
    }
    case DOCVEC: {
      if (_vector != nullptr) {
        for (auto it = _vector->begin(); it != _vector->end(); ++it) {
          delete *it;
        }
        delete _vector;
      }
      return;
    }
    case RANGE: {
      return;
    }
    default:
      return;
  }
}

AqlValue* AqlValue::clone () const {
  switch (_type) {
    case JSON: {
      return new AqlValue(new Json(_json->copy()));
    }
    case DOCVEC: {
      auto c = new std::vector<AqlItemBlock*>;
      c->reserve(_vector->size());
      for (auto it = _vector->begin(); it != _vector->end(); ++it) {
        c->push_back((*it)->slice(0, (*it)->size()));
      }
      return new AqlValue(c);
    }
    case RANGE: {
      return new AqlValue(_range._low, _range._high);
    }
    default: {
      TRI_ASSERT(false);
    }
  }

}

////////////////////////////////////////////////////////////////////////////////
/// @brief splice multiple blocks, note that the new block now owns all
/// AqlValue pointers in the old blocks, therefore, the latter are all
/// set to nullptr, just to be sure.
////////////////////////////////////////////////////////////////////////////////

AqlItemBlock* AqlItemBlock::splice(std::vector<AqlItemBlock*>& blocks)
{
  TRI_ASSERT(blocks.size() != 0);

  auto it = blocks.begin();
  TRI_ASSERT(it != blocks.end());
  size_t totalSize = (*it)->size();
  RegisterId nrRegs = (*it)->getNrVars();

  while (true) {
    if (++it == blocks.end()) {
      break;
    }
    totalSize += (*it)->size();
    TRI_ASSERT((*it)->getNrVars() == nrRegs);
  }

  auto res = new AqlItemBlock(totalSize, nrRegs);
  size_t pos = 0;
  for (it = blocks.begin(); it != blocks.end(); ++it) {
    for (size_t row = 0; row < (*it)->size(); ++row) {
      for (RegisterId col = 0; col < nrRegs; ++col) {
        res->setValue(pos+row, col, (*it)->getValue(row, col));
        (*it)->setValue(row, col, nullptr);
      }
    }
    pos += (*it)->size();
  }
  return res;
}

// Local Variables:
// mode: outline-minor
// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
// End: