src/row.cpp

/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you 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.
*/

#include "row.hpp"

#include "external.hpp"
#include "result_metadata.hpp"
#include "result_response.hpp"
#include "serialization.hpp"
#include "string_ref.hpp"

using namespace datastax;
using namespace datastax::internal::core;

extern "C" {

const CassValue* cass_row_get_column(const CassRow* row, size_t index) {
  if (index >= row->values.size()) {
    return NULL;
  }
  return CassValue::to(&row->values[index]);
}

const CassValue* cass_row_get_column_by_name(const CassRow* row, const char* name) {

  return cass_row_get_column_by_name_n(row, name, SAFE_STRLEN(name));
}

const CassValue* cass_row_get_column_by_name_n(const CassRow* row, const char* name,
                                               size_t name_length) {

  return CassValue::to(row->get_by_name(StringRef(name, name_length)));
}

} // extern "C"

namespace datastax { namespace internal { namespace core {

bool decode_row(Decoder& decoder, const ResultResponse* result, OutputValueVec& output) {
  output.clear();
  for (int i = 0; i < result->column_count(); ++i) {
    const ColumnDefinition& def = result->metadata()->get_column_definition(i);
    Value value = decoder.decode_value(def.data_type);
    if (value.is_valid()) {
      output.push_back(value);
    } else
      return false;
  }
  return true;
}

bool decode_next_row(Decoder& decoder, OutputValueVec& output) {
  const size_t column_count = output.size();
  for (size_t i = 0; i < column_count; ++i) {
    if (!decoder.update_value(output[i])) return false;
  }
  return true;
}

}}} // namespace datastax::internal::core

const Value* Row::get_by_name(const StringRef& name) const {
  IndexVec indices;
  if (result_->metadata()->get_indices(name, &indices) == 0) {
    return NULL;
  }
  return &values[indices[0]];
}

bool Row::get_string_by_name(const StringRef& name, String* out) const {
  const Value* value = get_by_name(name);
  if (value == NULL || value->is_null()) {
    return false;
  }
  *out = value->decoder().as_string();
  return true;
}

bool Row::get_uuid_by_name(const StringRef& name, CassUuid* out) const {
  const Value* value = get_by_name(name);
  if (value == NULL || value->is_null() || value->value_type() != CASS_VALUE_TYPE_UUID ||
      value->value_type() == CASS_VALUE_TYPE_TIMEUUID) {
    return false;
  }
  *out = value->as_uuid();
  return true;
}