app/models/component.rb
#
# A Component is a part of an Item; the principal content-bearing repository resource.
#
# Examples: Page of a book, track of a recording, etc.
#
class Component < Ddr::Models::Base
include Ddr::Models::Captionable
include Ddr::Models::HasContent
include Ddr::Models::HasIntermediateFile
include Ddr::Models::HasMultiresImage
include Ddr::Models::HasStructMetadata
include Ddr::Models::Streamable
belongs_to :parent, :property => :is_part_of, :class_name => 'Item'
belongs_to :target, :property => :has_external_target, :class_name => 'Target'
alias_method :item, :parent
alias_method :item=, :parent=
STRUCTURALLY_RELEVANT_DATASTREAMS = [ Ddr::Datastreams::CAPTION, Ddr::Datastreams::CONTENT,
Ddr::Datastreams::INTERMEDIATE_FILE, Ddr::Datastreams::MULTIRES_IMAGE,
Ddr::Datastreams::STREAMABLE_MEDIA, Ddr::Datastreams::THUMBNAIL ]
def collection
self.parent.parent rescue nil
end
def collection_uri
self.collection.internal_uri rescue nil
end
def publishable?
parent.present? && parent.published?
end
def default_structure
build_default_structure
end
private
def build_default_structure
document = Ddr::Models::Structure.xml_template
structure = Ddr::Models::Structure.new(document)
metshdr = structure.add_metshdr
structure.add_agent(parent: metshdr, role: Ddr::Models::Structures::Agent::ROLE_CREATOR,
name: Ddr::Models::Structures::Agent::NAME_REPOSITORY_DEFAULT)
structmap = structure.add_structmap(type: Ddr::Models::Structure::TYPE_DEFAULT)
if has_content?
filesec = structure.add_filesec
div = structure.add_div(parent: structmap)
filegrp = structure.add_filegrp(parent: filesec)
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_ORIGINAL_FILE,
Ddr::Datastreams::CONTENT)
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_PRESERVATION_MASTER_FILE,
Ddr::Datastreams::CONTENT)
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_INTERMEDIATE_FILE,
Ddr::Datastreams::INTERMEDIATE_FILE) if has_intermediate_file?
add_service_file_uses_to_default_structure(structure, filegrp, div)
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_THUMBNAIL_IMAGE,
Ddr::Datastreams::THUMBNAIL) if has_thumbnail?
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_TRANSCRIPT,
Ddr::Datastreams::CAPTION) if captioned?
end
structure
end
def add_service_file_uses_to_default_structure(structure, filegrp, div)
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_SERVICE_FILE,
Ddr::Datastreams::MULTIRES_IMAGE) if has_multires_image?
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_SERVICE_FILE,
Ddr::Datastreams::STREAMABLE_MEDIA) if streamable?
if !has_multires_image? && !streamable?
add_use_to_structure(structure, filegrp, div, Ddr::Models::Structure::USE_SERVICE_FILE,
Ddr::Datastreams::CONTENT)
end
end
def add_use_to_structure(structure, filegrp, div, use, datastream_name)
file = structure.add_file(parent: filegrp, use: use)
structure.add_flocat(parent: file, loctype: 'OTHER', otherloctype: 'AttachedFile', href: datastream_name)
structure.add_fptr(parent: div, fileid: file['ID'])
end
end