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#--
# Copyright (c) 2013 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.
#++
module TZInfo
# A TimezoneTransition defined by as integer timestamp, as a rational to
# create a DateTime or as both.
#
# @private
class TimezoneTransitionDefinition < TimezoneTransition #:nodoc:
# The numerator of the DateTime if the transition time is defined as a
# DateTime, otherwise the transition time as a timestamp.
attr_reader :numerator_or_time
protected :numerator_or_time
# Either the denominator of the DateTime if the transition time is defined
# as a DateTime, otherwise nil.
attr_reader :denominator
protected :denominator
# Creates a new TimezoneTransitionDefinition with the given offset,
# previous_offset (both TimezoneOffset instances) and UTC time.
#
# The time can be specified as a timestamp, as a rational to create a
# DateTime, or as both.
#
# If both a timestamp and rational are given, then the rational will only
# be used if the timestamp falls outside of the range of Time on the
# platform being used at runtime.
#
# DateTimes are created from the rational as follows:
#
# RubyCoreSupport.datetime_new!(RubyCoreSupport.rational_new!(numerator, denominator), 0, Date::ITALY)
#
# For performance reasons, the numerator and denominator must be specified
# in their lowest form.
def initialize(offset, previous_offset, numerator_or_timestamp, denominator_or_numerator = nil, denominator = nil)
super(offset, previous_offset)
if denominator
numerator = denominator_or_numerator
timestamp = numerator_or_timestamp
elsif denominator_or_numerator
numerator = numerator_or_timestamp
denominator = denominator_or_numerator
timestamp = nil
else
numerator = nil
denominator = nil
timestamp = numerator_or_timestamp
end
# Determine whether to use the timestamp or the numerator and denominator.
if numerator && (
!timestamp ||
(timestamp < 0 && !RubyCoreSupport.time_supports_negative) ||
((timestamp < -2147483648 || timestamp > 2147483647) && !RubyCoreSupport.time_supports_64bit)
)
@numerator_or_time = numerator
@denominator = denominator
else
@numerator_or_time = timestamp
@denominator = nil
end
@at = nil
end
# A TimeOrDateTime instance representing the UTC time when this transition
# occurs.
def at
# Thread-safey: It is possible that the value of @at may be calculated
# multiple times in concurrently executing threads. It is not worth the
# overhead of locking to ensure that @at is only calculated once.
unless @at
unless @denominator
@at = TimeOrDateTime.new(@numerator_or_time)
else
r = RubyCoreSupport.rational_new!(@numerator_or_time, @denominator)
dt = RubyCoreSupport.datetime_new!(r, 0, Date::ITALY)
@at = TimeOrDateTime.new(dt)
end
end
@at
end
# Returns true if this TimezoneTransitionDefinition is equal to the given
# TimezoneTransitionDefinition. Two TimezoneTransitionDefinition instances
# are considered to be equal by eql? if offset, previous_offset,
# numerator_or_time and denominator are all equal.
def eql?(tti)
tti.kind_of?(TimezoneTransitionDefinition) &&
offset == tti.offset && previous_offset == tti.previous_offset &&
numerator_or_time == tti.numerator_or_time && denominator == tti.denominator
end
# Returns a hash of this TimezoneTransitionDefinition instance.
def hash
@offset.hash ^ @previous_offset.hash ^ @numerator_or_time.hash ^ @denominator.hash
end
end
end
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