Class: Droonga::Plugins::Groonga::Select::RequestConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/droonga/plugins/groonga/select.rb

Constant Summary collapse

COMMAND_VERSION_1_ONLY_PATTERN =

for a backward compatibility for command_version=1, whitespace-separeted case (without functions) should be accepted.

/\A[^\s,()]+(\s+[^\s,()]+)+\z/

Instance Method Summary collapse

Instance Method Details

#apply_query_flags(condition, flags) ⇒ Object 



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# File 'lib/droonga/plugins/groonga/select.rb', line 118

def apply_query_flags(condition, flags)
  flags ||= DEFAULT_QUERY_FLAGS
  flags = flags.split("|")
  condition["allowPragma"] = flags.include?("ALLOW_PRAGMA")
  condition["allowColumn"] = flags.include?("ALLOW_COLUMN")
  condition["allowUpdate"] = flags.include?("ALLOW_UPDATE")
  condition["allowLeadingNot"] = flags.include?("ALLOW_LEADING_NOT")
end

#convert(select_request) ⇒ Object 



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# File 'lib/droonga/plugins/groonga/select.rb', line 26

def convert(select_request)
  @table = select_request["table"]
  @result_name = @table + "_result"

  output_columns = select_request["output_columns"] || "_id, _key, *"
  attributes = convert_output_columns(output_columns)
  offset = (select_request["offset"] || "0").to_i
  limit = (select_request["limit"] || "10").to_i

  output_offset = offset
  output_limit = limit

  sort_by = nil
  sort_keys = (select_request["sortby"] || "").split(",")
  unless sort_keys.empty?
    sort_by = {
      "keys" => sort_keys,
      "offset" => offset,
      "limit" => limit,
    }
    output_offset = 0
  end

  search_request = {
    "queries" => {
      @result_name => {
        "source" => @table,
        "output" => {
          "elements"   => [
            "startTime",
            "elapsedTime",
            "count",
            "attributes",
            "records",
          ],
          "attributes" => attributes,
          "offset" => output_offset,
          "limit" => output_limit,
        },
      }
    }
  }
  if sort_by
    search_request["queries"][@result_name]["sortBy"] = sort_by
  end

  condition = convert_condition(select_request)
  if condition
    search_request["queries"][@result_name]["condition"] = condition
  end

  drilldown_queries = convert_drilldown(select_request)
  if drilldown_queries
    search_request["queries"].merge!(drilldown_queries)
  end

  search_request
end

#convert_condition(select_request) ⇒ Object 



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# File 'lib/droonga/plugins/groonga/select.rb', line 85

def convert_condition(select_request)
  match_columns = select_request["match_columns"]
  match_to = match_columns ? match_columns.split(/ *\|\| */) : []
  query = select_request["query"]
  filter = select_request["filter"]

  conditions = []
  if query
    condition = {
      "query"  => query,
      "matchTo"=> match_to,
      "defaultOperator"=> "&&",
    }
    apply_query_flags(condition, select_request["query_flags"])
    conditions << condition
  end

  if filter
    conditions << filter
  end

  condition = nil

  case conditions.size
  when 1
    condition = conditions.first
  when 2
    condition = ["&&"] + conditions
  end

  condition
end

#convert_drilldown(select_request) ⇒ Object 



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# File 'lib/droonga/plugins/groonga/select.rb', line 127

def convert_drilldown(select_request)
  drilldown_keys = select_request["drilldown"]
  return nil if drilldown_keys.nil? or drilldown_keys.empty?

  drilldown_keys = drilldown_keys.split(",")

  sort_keys = (select_request["drilldown_sortby"] || "").split(",")
  columns   = convert_output_columns(select_request["drilldown_output_columns"] || "_key,_nsubrecs")
  offset    = (select_request["drilldown_offset"] || "0").to_i
  limit     = (select_request["drilldown_limit"] || "10").to_i

  queries = {}
  drilldown_keys.each_with_index do |key, index|
    query = {
      "source" => @result_name,
      "groupBy" => key,
      "output" => {
        "elements"   => [
          "count",
          "attributes",
          "records",
        ],
        "attributes" => columns,
        "limit" => limit,
      },
    }

    if sort_keys.empty?
      query["output"]["offset"] = offset
    else
      query["sortBy"] = {
        "keys"   => sort_keys,
        "offset" => offset,
        "limit"  => limit,
      }
    end

    queries["#{DRILLDOWN_RESULT_PREFIX}#{key}"] = query
  end
  queries
end

#convert_output_columns(output_columns) ⇒ Object 



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# File 'lib/droonga/plugins/groonga/select.rb', line 173

def convert_output_columns(output_columns)
  output_columns = output_columns.strip
  command_version_is_1 = output_columns =~ COMMAND_VERSION_1_ONLY_PATTERN
  if command_version_is_1
    output_columns.split(/\s+/)
  else
    output_columns.split(/\s*,\s*/)
  end
end