Class: ArcFurnace::Hash

Inherits:
Node
  • Object
show all
Defined in:
lib/arc-furnace/hash.rb

Direct Known Subclasses

BinaryKeyMergingHash, MergingHash

Instance Attribute Summary collapse

Attributes inherited from Node

#error_handler, #node_id, #params

Instance Method Summary collapse

Constructor Details

#initialize(source:, key_column:) ⇒ Hash

Returns a new instance of Hash.



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# File 'lib/arc-furnace/hash.rb', line 8

def initialize(source: , key_column:)
  @source = source
  @key_column = key_column
  @hash = {}
end

Instance Attribute Details

#key_column ⇒ Object (readonly)

Returns the value of attribute key_column.



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# File 'lib/arc-furnace/hash.rb', line 5

def key_column
  @key_column
end

Instance Method Details

#each(&block) ⇒ Object

Pass a block that accepts two argument, the join key for each value and the value



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# File 'lib/arc-furnace/hash.rb', line 16

def each(&block)
  hash.each(&block)
end

#finalize ⇒ Object

Called at the end of processing all rows; do any clean-up or state saving here.



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# File 'lib/arc-furnace/hash.rb', line 21

def finalize

end

#get(primary_key) ⇒ Object 



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# File 'lib/arc-furnace/hash.rb', line 41

def get(primary_key)
  hash[primary_key]
end

#prepare ⇒ Object 



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# File 'lib/arc-furnace/hash.rb', line 25

def prepare
  loop do
    break if source.empty?
    row = source.row
    key = row[key_column]
    if key
      if hash.include?(key)
        error_handler.duplicate_primary_key(duplicate_row: row, key: key, node_id: node_id)
      end
      hash[key] = row
    else
      error_handler.missing_primary_key(source_row: row, node_id: node_id)
    end
  end
end