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#--
# Copyright (c) 2005-2006 Philip Ross
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#++
require 'tzinfo/timezone'
module TZInfo
# A proxy class representing a timezone with a given identifier. TimezoneProxy
# inherits from Timezone and can be treated like any Timezone loaded with
# Timezone.get.
#
# The first time an attempt is made to access the data for the timezone, the
# real Timezone is loaded. If the proxy's identifier was not valid, then an
# exception will be raised at this point.
class TimezoneProxy < Timezone
# Construct a new TimezoneProxy for the given identifier. The identifier
# is not checked when constructing the proxy. It will be validated on the
# when the real Timezone is loaded.
def self.new(identifier)
# Need to override new to undo the behaviour introduced in Timezone#new.
tzp = super()
tzp.send(:setup, identifier)
tzp
end
# The identifier of the timezone, e.g. "Europe/Paris".
def identifier
@real_timezone ? @real_timezone.identifier : @identifier
end
# Returns the TimezonePeriod for the given UTC time. utc can either be
# a DateTime, Time or integer timestamp (Time.to_i). Any timezone
# information in utc is ignored (it is treated as a UTC time).
def period_for_utc(utc)
real_timezone.period_for_utc(utc)
end
# Returns the set of TimezonePeriod instances that are valid for the given
# local time as an array. If you just want a single period, use
# period_for_local instead and specify how abiguities should be resolved.
# Returns an empty array if no periods are found for the given time.
def periods_for_local(local)
real_timezone.periods_for_local(local)
end
# Dumps this TimezoneProxy for marshalling.
def _dump(limit)
identifier
end
# Loads a marshalled TimezoneProxy.
def self._load(data)
TimezoneProxy.new(data)
end
private
def setup(identifier)
@identifier = identifier
@real_timezone = nil
end
def real_timezone
@real_timezone ||= Timezone.get(@identifier)
end
end
end
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