Class: Charty::TableAdapters::HashAdapter

Inherits:
BaseAdapter
  • Object
show all
Defined in:
lib/charty/table_adapters/hash_adapter.rb

Instance Attribute Summary collapse

Attributes inherited from BaseAdapter

#columns, #index

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BaseAdapter

#==, #column_names

Constructor Details

#initialize(data, columns: nil, index: nil) ⇒ HashAdapter

Returns a new instance of HashAdapter.



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 58

def initialize(data, columns: nil, index: nil)
  case data
  when Hash
    arrays = data.values
    columns ||= data.keys
  when Array
    case data[0]
    when Numeric, String, Time, Date
      arrays = [data]
    when Hash
      raise NotImplementedError,
            "an array of records is not supported"
    when self.class.method(:array?)
      unsupported_data_format unless data.all?(&self.class.method(:array?))
      arrays = data.map(&:to_a).transpose
    else
      unsupported_data_format
    end
  else
    unsupported_data_format
  end

  unless arrays.empty?
    arrays, columns, index = check_data(arrays, columns, index)
  end

  @data = arrays.map.with_index {|a, i| [columns[i], a] }.to_h
  self.columns = columns unless columns.nil?
  self.index = index unless index.nil?
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 142

def data
  @data
end

Class Method Details

.array?(data) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 26

def self.array?(data)
  case data
  when Charty::Vector
    true
  when Array, method(:daru_vector?), method(:narray_vector?), method(:nmatrix_vector?),
       method(:numpy_vector?), method(:pandas_series?)
    true
  else
    false
  end
end

.daru_vector?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 38

def self.daru_vector?(x)
  defined?(Daru::Vector) && x.is_a?(Daru::Vector)
end

.narray_vector?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 42

def self.narray_vector?(x)
  defined?(Numo::NArray) && x.is_a?(Numo::NArray) && x.ndim == 1
end

.nmatrix_vector?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 46

def self.nmatrix_vector?(x)
  defined?(NMatrix) && x.is_a?(NMatrix) && x.dim == 1
end

.numpy_vector?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 50

def self.numpy_vector?(x)
  defined?(Numpy::NDArray) && x.is_a?(Numpy::NDArray) && x.ndim == 1
end

.pandas_series?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 54

def self.pandas_series?(x)
  defined?(Pandas::Series) && x.is_a?(Pandas::Series)
end

.supported?(data) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charty/table_adapters/hash_adapter.rb', line 8

def self.supported?(data)
  case data
  when []
    true
  when Array
    case data[0]
    when Numeric, String, Time, Date
      true
    when Hash
      data.all? {|el| el.is_a? Hash }
    when method(:array?)
      data.all?(&method(:array?))
    end
  when Hash
    true
  end
end

Instance Method Details

#[](row, column) ⇒ Object 



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 168

def [](row, column)
  if row
    @data[column][row]
  else
    case column
    when Symbol
      sym_key = column
      str_key = column.to_s
    else
      str_key = String.try_convert(column)
      sym_key = str_key.to_sym
    end

    column_data = if @data.key?(sym_key)
                    @data[sym_key]
                  else
                    @data[str_key]
                  end
    Vector.new(column_data, index: index, name: column)
  end
end

#column_length ⇒ Object 



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 155

def column_length
  data.length
end

#compare_data_equality(other) ⇒ Object 



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 159

def compare_data_equality(other)
  case other
  when DaruAdapter, PandasDataFrameAdapter
    other.compare_data_equality(self)
  else
    super
  end
end

#each ⇒ Object 



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 190

def each
  i, n = 0, shape[0]
  while i < n
    record = @data.map {|k, v| v[i] }
    yield record
    i += 1
  end
end

#length ⇒ Object 



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# File 'lib/charty/table_adapters/hash_adapter.rb', line 146

def length
  case
  when column_names.empty?
    0
  else
    data[column_names[0]].size
  end
end