////////////////////////////////////////////////////////////////////////////////
/// @brief joins
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2010-2012 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 Jan Steemann
/// @author Copyright 2012, triagens GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "VocBase/join.h"


////////////////////////////////////////////////////////////////////////////////
/// @addtogroup VocBase
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief Free join part memory
////////////////////////////////////////////////////////////////////////////////

static void FreePart (TRI_join_part_t* part) {
  if (part->_alias) {
    TRI_Free(part->_alias);
  }

  if (part->_collectionName) {
    TRI_Free(part->_collectionName);
  }

  TRI_Free(part);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief Free join memory
////////////////////////////////////////////////////////////////////////////////

static void FreeSelectJoin (TRI_select_join_t* join) {
  TRI_join_part_t* part;
  size_t i;

  for (i = 0; i < join->_parts._length; i++) {
    part = (TRI_join_part_t*) join->_parts._buffer[i];
    part->free(part);
  }

  TRI_DestroyVectorPointer(&join->_parts);
  TRI_Free(join);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief Add a part to a select join
////////////////////////////////////////////////////////////////////////////////

bool TRI_AddPartSelectJoin (TRI_select_join_t* join, const TRI_join_type_e type, 
                            TRI_qry_where_t* condition, char* collectionName, 
                            char* alias) {
  
  TRI_join_part_t* part;
  
  assert(join != 0);
  part = (TRI_join_part_t*) TRI_Allocate(sizeof(TRI_join_part_t));

  if (part == 0) {
    return false;
  }
   
  part->_type = type;
  part->_condition = condition;
  part->_collection = 0;
  part->_collectionName = TRI_DuplicateString(collectionName);
  part->_alias = TRI_DuplicateString(alias);
  part->free = FreePart; 

  TRI_PushBackVectorPointer(&join->_parts, part);
  return true;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief Create a new join 
////////////////////////////////////////////////////////////////////////////////

TRI_select_join_t* TRI_CreateSelectJoin (void) {
  TRI_select_join_t* join;

  join = (TRI_select_join_t*) TRI_Allocate(sizeof(TRI_select_join_t));
  if (join == NULL) {
    return NULL;
  }

  TRI_InitVectorPointer(&join->_parts);
  join->free = FreeSelectJoin;

  return join;
}

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////


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