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Versions: 19
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Contents
require 'arc-furnace/source'
module ArcFurnace
class AbstractJoin < Source
private_attr_reader :hash, :source, :key_column
# The source is a source, the hash is a hash, and one can optionally
# pass the key column to get the primary key for each source entity, the
# default is equijoin semantics--the key of the hash is used.
def initialize(source: , hash:, key_column: nil)
if source.is_a?(::ArcFurnace::Source) && hash.is_a?(::ArcFurnace::Hash)
@hash = hash
@source = source
@key_column = key_column || hash.key_column
else
raise 'Must be passed one Hash and one Source!'
end
end
def value
if @value.nil? && !empty?
advance
end
@value
end
def advance
raise "Unimplemented!"
end
delegate empty?: :source
protected
def merge_source_row(source_row)
key = source_row[key_column]
if key
if hash_value = hash.get(key)
hash_value = hash_value.deep_dup
source_row.each do |key, value|
hash_value[key] = value
end
@value = hash_value
true
else
error_handler.missing_hash_key(source_row: source_row, key: key, node_id: node_id)
false
end
else
error_handler.missing_join_key(source_row: source_row, node_id: node_id)
end
end
end
end
Version data entries
19 entries across 19 versions & 1 rubygems