arangodb/lib/Basics/JsonHelper.cpp

////////////////////////////////////////////////////////////////////////////////
/// @brief json helper functions
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2004-2013 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 2012-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "Basics/JsonHelper.h"

#include "BasicsC/string-buffer.h"

using namespace triagens::basics;

// -----------------------------------------------------------------------------
// --SECTION--                                                  class JsonHelper
// -----------------------------------------------------------------------------

// -----------------------------------------------------------------------------
// --SECTION--                                             public static methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup ArangoDB
/// @{
////////////////////////////////////////////////////////////////////////////////
      
////////////////////////////////////////////////////////////////////////////////
/// @brief stringify json
////////////////////////////////////////////////////////////////////////////////
        
std::string JsonHelper::toString (TRI_json_t const* json) {
  TRI_string_buffer_t buffer;

  TRI_InitStringBuffer(&buffer, TRI_UNKNOWN_MEM_ZONE);
  int res = TRI_StringifyJson(&buffer, json);

  if (res != TRI_ERROR_NO_ERROR) {
    return "";
  }

  string out(TRI_BeginStringBuffer(&buffer), TRI_LengthStringBuffer(&buffer));
  TRI_DestroyStringBuffer(&buffer);

  return out;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns an array sub-element
////////////////////////////////////////////////////////////////////////////////
        
TRI_json_t* JsonHelper::getArrayElement (TRI_json_t const* json, 
                                         const char* name) {
  if (! isArray(json)) {
    return 0;
  }

  return TRI_LookupArrayJson(json, name);
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns a string sub-element, or a default it is does not exist
////////////////////////////////////////////////////////////////////////////////
        
std::string JsonHelper::getStringValue (TRI_json_t const* json, 
                                        const char* name, 
                                        const std::string& defaultValue) {
  TRI_json_t const* sub = getArrayElement(json, name);

  if (isString(sub)) {
    return string(sub->_value._string.data, sub->_value._string.length - 1);
  }
  return defaultValue;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns a numeric sub-element, or a default it is does not exist
////////////////////////////////////////////////////////////////////////////////

double JsonHelper::getNumberValue (TRI_json_t const* json, 
                                   const char* name, 
                                   double defaultValue) {
  TRI_json_t const* sub = getArrayElement(json, name);

  if (isNumber(sub)) {
    return sub->_value._number;
  }
  return defaultValue;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns a double sub-element, or a default it is does not exist
////////////////////////////////////////////////////////////////////////////////

double JsonHelper::getDoubleValue (TRI_json_t const* json, 
                                   const char* name, 
                                   double defaultValue) {
  TRI_json_t const* sub = getArrayElement(json, name);

  if (isNumber(sub)) {
    return sub->_value._number;
  }
  return defaultValue;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns an int sub-element, or a default it is does not exist
////////////////////////////////////////////////////////////////////////////////

int JsonHelper::getIntValue (TRI_json_t const* json, 
                             const char* name, 
                             int defaultValue) {
  TRI_json_t const* sub = getArrayElement(json, name);

  if (isNumber(sub)) {
    return (int) sub->_value._number;
  }
  return defaultValue;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns a uint64 sub-element, or a default it is does not exist
////////////////////////////////////////////////////////////////////////////////

uint64_t JsonHelper::getUInt64Value (TRI_json_t const* json, 
                                     const char* name, 
                                     uint64_t defaultValue) {
  TRI_json_t const* sub = getArrayElement(json, name);

  if (isNumber(sub)) {
    return (uint64_t) sub->_value._number;
  }
  return defaultValue;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns a boolean sub-element, or a default it is does not exist
////////////////////////////////////////////////////////////////////////////////
        
bool JsonHelper::getBooleanValue (TRI_json_t const* json, 
                                  const char* name, 
                                  bool defaultValue) {
  TRI_json_t const* sub = getArrayElement(json, name);

  if (isBoolean(sub)) {
    return sub->_value._boolean;
  }

  return defaultValue;
}

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