Class: DbAgile::Core::Schema::Physical::Index

Inherits:
DbAgile::Core::Schema::Part show all
Defined in:
lib/dbagile/core/schema/physical/index.rb

Instance Attribute Summary

Attributes inherited from DbAgile::Core::Schema::Part

#definition, #name

Attributes inherited from SchemaObject

#parent, #status

Instance Method Summary collapse

Methods inherited from DbAgile::Core::Schema::Part

#_sanity_check, #dup, #initialize, #look_same_as?, #to_s, #visit

Methods inherited from SchemaObject

#ancestors, #attribute?, #builder_args, #builder_handler, #candidate_key?, #composite?, #constraint?, #foreign_key?, #index?, #logical?, #outside_dependencies, #outside_dependents, #part?, #physical?, #primary_key?, #relation_variable, #relvar?, #relview?, #schema

Constructor Details

This class inherits a constructor from DbAgile::Core::Schema::Part

Instance Method Details

#_semantics_check(clazz, errors) ⇒ Object

See Also:



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# File 'lib/dbagile/core/schema/physical/index.rb', line 33

def _semantics_check(clazz, errors)
  if (trv = indexed_relvar).nil?
    code = clazz::InvalidIndex | clazz::NoSuchRelvar
    errors.add_error(self, code, :relvar_name => definition[:relvar])
  elsif !trv.heading.has_attributes?(definition[:attributes])
    code = clazz::InvalidIndex | clazz::NoSuchRelvarAttributes
    errors.add_error(self, code, :relvar_name => trv.name,
                                 :attributes  => definition[:attributes])
  end
end

#dependencies(include_parent = false) ⇒ Object

See Also:



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# File 'lib/dbagile/core/schema/physical/index.rb', line 22

def dependencies(include_parent = false)
  deps = indexed_attributes
  deps += [ parent ] if include_parent
  deps
end

#indexed_attributes ⇒ Object

Returns indexed attributes



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# File 'lib/dbagile/core/schema/physical/index.rb', line 13

def indexed_attributes
  definition[:attributes].collect{|k| indexed_relvar.heading[k]}
end

#indexed_relvar ⇒ Object

Relation variable targettet by this index



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# File 'lib/dbagile/core/schema/physical/index.rb', line 8

def indexed_relvar
  schema.logical.relation_variable(definition[:relvar])
end

#to_yaml(opts = {}) ⇒ Object

Delegation pattern on YAML flushing



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# File 'lib/dbagile/core/schema/physical/index.rb', line 49

def to_yaml(opts = {})
  YAML::quick_emit(self, opts){|out|
    defn = definition
    attrs = Schema::Builder::Coercion::unsymbolize_array(definition[:attributes])
    out.map("tag:yaml.org,2002:map", :inline ) do |map|
      map.add('relvar', definition[:relvar].to_s)
      map.add('attributes', attrs)
    end
  }
end