Class: Arrow::ArrayBuilder

Inherits:
Object
  • Object
show all
Extended by:
ArrayBuildable
Defined in:
lib/arrow/array-builder.rb,
lib/arrow/jruby/array-builder.rb

Constant Summary

Constants included from ArrayBuildable

Arrow::ArrayBuildable::ValueVector

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ArrayBuildable

buildable?

Constructor Details

#initialize ⇒ ArrayBuilder

Returns a new instance of ArrayBuilder.



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# File 'lib/arrow/jruby/array-builder.rb', line 34

def initialize
  @vector = self.class::Array::Vector.new("", Arrow.allocator)
  @vector.allocate_new
  @index = 0
end

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_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]
    if builder.nil? and builder_info[:builder_type]
      builder = create_builder(builder_info)
    end
  end
  if builder
    builder.build(values)
  else
    Arrow::StringArray.new(values)
  end
end

.buildable?(args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arrow/array-builder.rb', line 47

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

Instance Method Details

#append(*values) ⇒ Object

Since:

  • 0.12.0



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# File 'lib/arrow/array-builder.rb', line 240

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 



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# File 'lib/arrow/jruby/array-builder.rb', line 63

def append_nulls(n)
  n.times do
    @vector.set_null(@index)
    @index += 1
  end
end

#append_value(value) ⇒ Object 



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# File 'lib/arrow/jruby/array-builder.rb', line 40

def append_value(value)
  @vector.set(@index, value)
  @index += 1
end

#append_values(values, is_valids = nil) ⇒ Object 



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# File 'lib/arrow/jruby/array-builder.rb', line 45

def append_values(values, is_valids=nil)
  if is_valids
    values.zip(is_valids) do |value, is_valid|
      if is_valid
        @vector.set(@index, value)
      else
        @vector.set_null(@index)
      end
      @index += 1
    end
  else
    values.each do |value|
      @vector.set(@index, value)
      @index += 1
    end
  end
end

#build(values) ⇒ Object 



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# File 'lib/arrow/array-builder.rb', line 234

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

#finish ⇒ Object 



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# File 'lib/arrow/jruby/array-builder.rb', line 70

def finish
  @vector.set_value_count(@index)
  vector, @vector = @vector, nil
  self.class::Array.new(vector)
end