arangodb/SkipLists/sl-operator.c

////////////////////////////////////////////////////////////////////////////////
/// @brief storage for operations used for where statement
///
/// @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 Dr. O
/// @author Copyright 2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "sl-operator.h"


// -----------------------------------------------------------------------------
// --SECTION--                                                   SELECT DOCUMENT
// -----------------------------------------------------------------------------

// -----------------------------------------------------------------------------
// --SECTION--                                                   private methods
// -----------------------------------------------------------------------------

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


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

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

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

////////////////////////////////////////////////////////////////////////////////
/// @brief removes allocated memory
////////////////////////////////////////////////////////////////////////////////

TRI_sl_operator_t* CreateSLOperator(TRI_sl_operator_type_e operatorType,
                                    TRI_sl_operator_t* leftOperand,
                                    TRI_sl_operator_t* rightOperand,
                                    TRI_json_t* parameters,
                                    TRI_shaped_json_t* fields,
                                    size_t numFields, void* collection) {

  TRI_sl_operator_t*          newOperator;
  TRI_sl_logical_operator_t*  newLogicalOperator;
  TRI_sl_relation_operator_t* newRelationOperator;
  
  switch (operatorType) {
    case TRI_SL_AND_OPERATOR: 
    case TRI_SL_NOT_OPERATOR:
    case TRI_SL_OR_OPERATOR: 
    {
      newLogicalOperator              = (TRI_sl_logical_operator_t*)TRI_Allocate(sizeof(TRI_sl_logical_operator_t));
      if (!newLogicalOperator) {
        return NULL;
      }

      newLogicalOperator->_base._type = operatorType;
      newLogicalOperator->_left       = leftOperand;
      newLogicalOperator->_right      = rightOperand;
      newOperator = &(newLogicalOperator->_base);
      break;
    }
    
    case TRI_SL_EQ_OPERATOR: 
    case TRI_SL_GE_OPERATOR: 
    case TRI_SL_GT_OPERATOR: 
    case TRI_SL_NE_OPERATOR: 
    case TRI_SL_LE_OPERATOR: 
    case TRI_SL_LT_OPERATOR: 
    {
      newRelationOperator              = (TRI_sl_relation_operator_t*)TRI_Allocate(sizeof(TRI_sl_relation_operator_t));
      if (!newRelationOperator) {
        return NULL;
      }

      /* FIXME: memory allocation might fail */
      newRelationOperator->_base._type = operatorType;
      newRelationOperator->_parameters = parameters;
      newRelationOperator->_fields     = fields;
      newRelationOperator->_numFields  = numFields;
      newRelationOperator->_collection = collection;
      newOperator = &(newRelationOperator->_base);
      break;
    }    
    
    default: {
      newOperator = NULL;
      break;
    }      
  } // end of switch statement  
  
  return newOperator;
}

void ClearSLOperator(TRI_sl_operator_t* slOperator) {

  TRI_sl_logical_operator_t*  logicalOperator;
  TRI_sl_relation_operator_t* relationOperator;
  
  if (slOperator == NULL) {
    return;
  }
  
  switch (slOperator->_type) {
    case TRI_SL_AND_OPERATOR: 
    case TRI_SL_NOT_OPERATOR:
    case TRI_SL_OR_OPERATOR: 
    {
      logicalOperator = (TRI_sl_logical_operator_t*)(slOperator);
      ClearSLOperator(logicalOperator->_left);
      ClearSLOperator(logicalOperator->_right);

      TRI_Free(logicalOperator);
      break;
    }
    
    case TRI_SL_EQ_OPERATOR: 
    case TRI_SL_GE_OPERATOR: 
    case TRI_SL_GT_OPERATOR: 
    case TRI_SL_NE_OPERATOR: 
    case TRI_SL_LE_OPERATOR: 
    case TRI_SL_LT_OPERATOR: 
    {
      size_t i;

      relationOperator = (TRI_sl_relation_operator_t*)(slOperator);
      if (relationOperator->_parameters != NULL) {
        TRI_FreeJson(relationOperator->_parameters);
      } 
     
      // relationOperator->_fields contains _numFields shapedJson objects
      for (i = 0; i < relationOperator->_numFields; ++i) {
        // destroy each individual shapedJson object
        TRI_shaped_json_t* shaped = relationOperator->_fields + i;
        TRI_DestroyShapedJson(shaped);
      }
      // free the memory pointer
      TRI_Free(relationOperator->_fields);
      TRI_Free(relationOperator);
      break;
    }    
  } // end of switch statement
}


TRI_sl_operator_t* CopySLOperator(TRI_sl_operator_t* slOperator) {

  TRI_sl_operator_t*          newOperator;
  
  TRI_sl_logical_operator_t*  newLogicalOperator;
  TRI_sl_logical_operator_t*  oldLogicalOperator;
  
  TRI_sl_relation_operator_t* newRelationOperator;
  TRI_sl_relation_operator_t* oldRelationOperator;
  
  
  newOperator = NULL;
  
  if (slOperator == NULL) {
    return NULL;
  }
  
  switch (slOperator->_type) {
    case TRI_SL_AND_OPERATOR: 
    case TRI_SL_NOT_OPERATOR:
    case TRI_SL_OR_OPERATOR: 
    {
      oldLogicalOperator              = (TRI_sl_logical_operator_t*)(slOperator);
      newLogicalOperator              = (TRI_sl_logical_operator_t*) (TRI_Allocate( sizeof(TRI_sl_logical_operator_t) ));
      /* FIXME: memory allocation might fail */
      newLogicalOperator->_base._type = slOperator->_type;
      newLogicalOperator->_left       = CopySLOperator(oldLogicalOperator->_left);
      newLogicalOperator->_right      = CopySLOperator(oldLogicalOperator->_right);
      newOperator = &(newLogicalOperator->_base);      
      break;
    }
    
    case TRI_SL_EQ_OPERATOR: 
    case TRI_SL_GE_OPERATOR: 
    case TRI_SL_GT_OPERATOR: 
    case TRI_SL_NE_OPERATOR: 
    case TRI_SL_LE_OPERATOR: 
    case TRI_SL_LT_OPERATOR: 
    {
      oldRelationOperator              = (TRI_sl_relation_operator_t*)(slOperator);
      newRelationOperator              = (TRI_sl_relation_operator_t*) (TRI_Allocate( sizeof(TRI_sl_relation_operator_t) ));
      /* FIXME: memory allocation might fail */
      newRelationOperator->_base._type = slOperator->_type;
      newRelationOperator->_parameters = TRI_CopyJson(oldRelationOperator->_parameters);
      newRelationOperator->_fields     = TRI_CopyShapedJson(oldRelationOperator->_fields);
      newRelationOperator->_numFields  = oldRelationOperator->_numFields;
      newRelationOperator->_collection = oldRelationOperator->_collection;
      newOperator = &(newRelationOperator->_base);      
      break;
    }        
  }
  
  return newOperator;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief a skiplist operator with all its linked sub information
////////////////////////////////////////////////////////////////////////////////

void TRI_FreeSLOperator(TRI_sl_operator_t* slOperator) {
  ClearSLOperator(slOperator);
}

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

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