Class: MARC::Spec::Queries::QueryExecutor

Inherits:
Object
  • Object
show all
Includes:
Part
Defined in:
lib/marc/spec/queries/query_executor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Part

#eql?, #hash, #inspect

Constructor Details

#initialize(marc_record, root, cache = {}) ⇒ QueryExecutor

Returns a new instance of QueryExecutor.



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# File 'lib/marc/spec/queries/query_executor.rb', line 12

def initialize(marc_record, root, cache = {})
  @marc_record = ensure_type(marc_record, MARC::Record)
  @root_query = as_query(root)
  @cache = cache

  @root_tag = root_query.tag || Tag.new('...')
  @root_fields = apply_tag(root_tag)
end

Instance Attribute Details

#marc_record ⇒ Object (readonly)

Returns the value of attribute marc_record.



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# File 'lib/marc/spec/queries/query_executor.rb', line 10

def marc_record
  @marc_record
end

#root_fields ⇒ Object (readonly)

Returns the value of attribute root_fields.



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# File 'lib/marc/spec/queries/query_executor.rb', line 10

def root_fields
  @root_fields
end

#root_query ⇒ Object (readonly)

Returns the value of attribute root_query.



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# File 'lib/marc/spec/queries/query_executor.rb', line 10

def root_query
  @root_query
end

#root_tag ⇒ Object (readonly)

Returns the value of attribute root_tag.



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# File 'lib/marc/spec/queries/query_executor.rb', line 10

def root_tag
  @root_tag
end

Instance Method Details

#apply_selector(selector, field) ⇒ Object 



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# File 'lib/marc/spec/queries/query_executor.rb', line 29

def apply_selector(selector, field)
  return [field] unless selector

  cache_key = [selector, field]
  cache[cache_key] ||= selector.apply(field)
end

#apply_tag(tag) ⇒ Object 



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# File 'lib/marc/spec/queries/query_executor.rb', line 25

def apply_tag(tag)
  cache[tag] ||= tag.apply(marc_record)
end

#condition_met?(condition, context_field, context_result) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/marc/spec/queries/query_executor.rb', line 36

def condition_met?(condition, context_field, context_result)
  cond_ctx = ConditionContext.new(context_field, context_result, self)
  condition.met?(cond_ctx)
end

#execute ⇒ Object 



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# File 'lib/marc/spec/queries/query_executor.rb', line 21

def execute
  root_query.execute(self, root_fields)
end