Class: Arrow::ArrayBuilder

Inherits:

Object

• Object
• Arrow::ArrayBuilder

Defined in:

lib/arrow/array-builder.rb

Class Method Summary

• .build(values) ⇒ Object
• .buildable?(args) ⇒ Boolean

Instance Method Summary

• #append(*values) ⇒ Object
• #append_nulls(n) ⇒ Object
• #build(values) ⇒ Object

Class Method Details

.build(values) ⇒ Object

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

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

  builder_info = nil
  values.each do |value|
    builder_info = detect_builder_info(value, builder_info)
    break if builder_info and builder_info[:detected]
  end
  if builder_info
    builder = builder_info[:builder]
    builder.build(values)
  else
    Arrow::StringArray.new(values)
  end
end

.buildable?(args) ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/arrow/array-builder.rb', line 42

def buildable?(args)
  args.size == method(:build).arity
end

Instance Method Details

#append(*values) ⇒ Object

Since:

• 0.12.0

# File 'lib/arrow/array-builder.rb', line 149

def append(*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
end

#append_nulls(n) ⇒ Object

# File 'lib/arrow/array-builder.rb', line 198

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

#build(values) ⇒ Object

# File 'lib/arrow/array-builder.rb', line 143

def build(values)
  append(*values)
  finish
end