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Contents
require 'json'
require 'rational'
class ExifData < Hash
include RubyLess
# Deserialization used by Property
def self.json_create(serialized)
if data = serialized['data']
ExifData.new(data)
else
nil
end
end
# Serialization used by Property
def to_json(*args)
{ 'json_class' => 'ExifData', 'data' => Hash[self.to_a] }.to_json(*args)
end
# We need this extra rule to avoid ActiveSupport json encoder thinking Hash[self.to_a] is the
# same object as this. This is a temporary fix until ActiveSupport use object_id for :seen.
def ==(other)
other.class == self.class && super
end
# You can create new ExifData objects with either a json representation (String), a
# hash of key => value or an array of key,value pairs.
def initialize(data)
if data.kind_of?(String)
replace JSON::parse(data) rescue {}
elsif data.kind_of?(Hash)
replace data
elsif data.kind_of?(Array)
replace Hash[*data.flatten] rescue {}
else
# ignore
end
end
['DateTime', 'DateTimeOriginal', 'DateTimeDigitised'].each do |k|
method = k.underscore.to_sym
safe_method method => Time
define_method(method) do
date_from_field(k)
end
end
['GPSLongitude', 'GPSLatitude'].each do |k|
method = k.underscore.to_sym
safe_method method => Number
define_method(method) do
position_from_field(k)
end
end
private
def date_from_field(k)
return nil unless v = self[k]
Time.parse(v.sub(/(....):(..):(..) /, '\1-\2-\3 ')) rescue nil
end
def position_from_field(k)
return nil unless v = self[k]
if v =~ /(-?\d+)\/(\d+),\s*(-?\d+)\/(\d+),\s*(-?\d+)\/(\d+)/
deg = Rational($1.to_i, $2.to_i)
min = Rational($3.to_i, $4.to_i)
sec = Rational($5.to_i, $6.to_i)
deg + min/60.0 + sec/3600.0
else
nil
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems