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module Axlsx
# A relationship defines a reference between package parts.
# @note Packages automatically manage relationships.
class Relationship
class << self
# Keeps track of relationship ids in use.
# @return [Array]
def ids_cache
Thread.current[:axlsx_relationship_ids_cache] ||= {}
end
# Initialize cached ids.
#
# This should be called before serializing a package (see {Package#serialize} and
# {Package#to_stream}) to make sure that serialization is idempotent (i.e.
# Relationship instances are generated with the same IDs everytime the package
# is serialized).
def initialize_ids_cache
Thread.current[:axlsx_relationship_ids_cache] = {}
end
# Clear cached ids.
#
# This should be called after serializing a package (see {Package#serialize} and
# {Package#to_stream}) to free the memory allocated for cache.
#
# Also, calling this avoids memory leaks (cached ids lingering around
# forever).
def clear_ids_cache
Thread.current[:axlsx_relationship_ids_cache] = nil
end
# Generate and return a unique id (eg. `rId123`) Used for setting {#Id}.
#
# The generated id depends on the number of previously cached ids, so using
# {clear_ids_cache} will automatically reset the generated ids, too.
# @return [String]
def next_free_id
"rId#{ids_cache.size + 1}"
end
end
# The id of the relationship (eg. "rId123"). Most instances get their own unique id.
# However, some instances need to share the same id – see {#should_use_same_id_as?}
# for details.
# @return [String]
attr_reader :Id
# The location of the relationship target
# @return [String]
attr_reader :Target
# The type of relationship
# @note Supported types are defined as constants in Axlsx:
# @see XML_NS_R
# @see TABLE_R
# @see PIVOT_TABLE_R
# @see WORKBOOK_R
# @see WORKSHEET_R
# @see APP_R
# @see RELS_R
# @see CORE_R
# @see STYLES_R
# @see CHART_R
# @see DRAWING_R
# @return [String]
attr_reader :Type
# The target mode of the relationship
# used for hyperlink type relationships to mark the relationship to an external resource
# TargetMode can be specified during initialization by passing in a :target_mode option
# Target mode must be :external for now.
attr_reader :TargetMode
# The source object the relations belongs to (e.g. a hyperlink, drawing, ...). Needed when
# looking up the relationship for a specific object (see {Relationships#for}).
attr_reader :source_obj
# Initializes a new relationship.
# @param [Object] source_obj see {#source_obj}
# @param [String] type The type of the relationship
# @param [String] target The target for the relationship
# @option [Symbol] :target_mode only accepts :external.
def initialize(source_obj, type, target, options={})
@source_obj = source_obj
self.Target=target
self.Type=type
self.TargetMode = options[:target_mode] if options[:target_mode]
@Id = (self.class.ids_cache[ids_cache_key] ||= self.class.next_free_id)
end
# @see Target
def Target=(v) Axlsx::validate_string v; @Target = v end
# @see Type
def Type=(v) Axlsx::validate_relationship_type v; @Type = v end
# @see TargetMode
def TargetMode=(v) RestrictionValidator.validate 'Relationship.TargetMode', [:External, :Internal], v; @TargetMode = v; end
# serialize relationship
# @param [String] str
# @return [String]
def to_xml_string(str = '')
h = Axlsx.instance_values_for(self).reject{|k, _| k == "source_obj"}
str << '<Relationship '
str << (h.map { |key, value| '' << key.to_s << '="' << Axlsx::coder.encode(value.to_s) << '"'}.join(' '))
str << '/>'
end
# A key that determines whether this relationship should use already generated id.
#
# Instances designating the same relationship need to use the same id. We can not simply
# compare the {#Target} attribute, though: `foo/bar.xml`, `../foo/bar.xml`,
# `../../foo/bar.xml` etc. are all different but probably mean the same file (this
# is especially an issue for relationships in the context of pivot tables). So lets
# just ignore this attribute for now (except when {#TargetMode} is set to `:External` –
# then {#Target} will be an absolute URL and thus can safely be compared).
#
# @todo Implement comparison of {#Target} based on normalized path names.
# @return [Array]
def ids_cache_key
key = [source_obj, self.Type, self.TargetMode]
key << self.Target if self.TargetMode == :External
key
end
end
end
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