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Contents
# coding: utf-8
class PDF::Reader
# A Hash-like object for caching commonly used objects from a PDF file.
#
# This is an internal class used by PDF::Reader::ObjectHash
#
class ObjectCache # nodoc
# These object types use little memory and are accessed a heap of times as
# part of random page access, so we'll cache the unmarshalled objects and
# avoid lots of repetitive (and expensive) tokenising
CACHEABLE_TYPES = [:Catalog, :Page, :Pages]
def initialize
@objects = {}
end
def [](key)
@objects[key]
end
def []=(key, value)
@objects[key] = value if cacheable?(value)
end
def fetch(key, local_default = nil)
@objects.fetch(key, local_default)
end
def each(&block)
@objects.each(&block)
end
alias :each_pair :each
def each_key(&block)
@objects.each_key(&block)
end
def each_value(&block)
@objects.each_value(&block)
end
def size
@objects.size
end
alias :length :size
def empty?
@objects.empty?
end
def has_key?(key)
@objects.has_key?(key)
end
alias :include? :has_key?
alias :key? :has_key?
alias :member? :has_key?
def has_value?(value)
@objects.has_value?(value)
end
def to_s
"<PDF::Reader::ObjectCache size: #{self.size}>"
end
def keys
@objects.keys
end
def values
@objects.values
end
private
def cacheable?(obj)
obj.is_a?(Hash) && CACHEABLE_TYPES.include?(obj[:Type])
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems