Class: Arrow::ArrayBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/arrow/array-builder.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.build(values) ⇒ Object 



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# File 'lib/arrow/array-builder.rb', line 23

def build(values)
  if self != ArrayBuilder
    builder = new
    return builder.build(values)
  end

  builder_class = nil
  values.each do |value|
    case value
    when nil
      # Ignore
    when true, false
      return BooleanArray.new(values)
    when String
      return StringArray.new(values)
    when Float
      return DoubleArray.new(values)
    when Integer
      if value < 0
        builder = IntArrayBuilder.new
        return builder.build(values)
      else
        builder_class = UIntArrayBuilder
      end
    when Time
      data_type = TimestampDataType.new(:nano)
      builder = TimestampArrayBuilder.new(data_type)
      return builder.build(values)
    when DateTime
      return Date64Array.new(values)
    when Date
      return Date32Array.new(values)
    else
      return StringArray.new(values)
    end
  end
  if builder_class
    builder_class.new.build(values)
  else
    Arrow::StringArray.new(values)
  end
end

Instance Method Details

#append_nulls(n) ⇒ Object 



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# File 'lib/arrow/array-builder.rb', line 118

def append_nulls(n)
  n.times do
    append_null
  end
end

#build(values) ⇒ Object 



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# File 'lib/arrow/array-builder.rb', line 67

def build(values)
  value_convertable = respond_to?(:convert_to_arrow_value, true)
  start_index = 0
  current_index = 0
  status = :value

  values.each do |value|
    if value.nil?
      if status == :value
        if start_index != current_index
          target_values = values[start_index...current_index]
          if value_convertable
            target_values = target_values.collect do |v|
              convert_to_arrow_value(v)
            end
          end
          append_values(target_values, nil)
          start_index = current_index
        end
        status = :null
      end
    else
      if status == :null
        append_nulls(current_index - start_index)
        start_index = current_index
        status = :value
      end
    end
    current_index += 1
  end
  if start_index != current_index
    if status == :value
      if start_index == 0 and current_index == values.size
        target_values = values
      else
        target_values = values[start_index...current_index]
      end
      if value_convertable
        target_values = target_values.collect do |v|
          convert_to_arrow_value(v)
        end
      end
      append_values(target_values, nil)
    else
      append_nulls(current_index - start_index)
    end
  end

  finish
end