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#--
# Copyright (c) 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 'date'
require 'tzinfo/time_or_datetime'
module TZInfo
# Represents an offset defined in a Timezone data file.
class TimezoneTransitionInfo #:nodoc:
# The offset this transition changes to (a TimezoneOffsetInfo instance).
attr_reader :offset
# The offset this transition changes from (a TimezoneOffsetInfo instance).
attr_reader :previous_offset
# 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 denominotor of the DateTime if the transition time is defined
# as a DateTime, otherwise nil.
attr_reader :denominator
protected :denominator
# Creates a new TimezoneTransitionInfo with the given offset,
# previous_offset (both TimezoneOffsetInfo instances) and UTC time.
# if denominator is nil, numerator_or_time is treated as a number of
# seconds since the epoch. If denominator is specified numerator_or_time
# and denominator are used to create a DateTime as follows:
#
# DateTime.new!(Rational.send(:new!, numerator_or_time, 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_time, denominator = nil)
@offset = offset
@previous_offset = previous_offset
@numerator_or_time = numerator_or_time
@denominator = denominator
@at = nil
@local_end = nil
@local_start = nil
end
# A TimeOrDateTime instance representing the UTC time when this transition
# occurs.
def at
unless @at
unless @denominator
@at = TimeOrDateTime.new(@numerator_or_time)
else
r = Rational.send(:new!, @numerator_or_time, @denominator)
# Ruby 1.8.6 introduced new! and deprecated new0.
# Ruby 1.9.0 removed new0.
# We still need to support new0 for older versions of Ruby.
if DateTime.respond_to? :new!
dt = DateTime.new!(r, 0, Date::ITALY)
else
dt = DateTime.new0(r, 0, Date::ITALY)
end
@at = TimeOrDateTime.new(dt)
end
end
@at
end
# A TimeOrDateTime instance representing the local time when this transition
# causes the previous observance to end (calculated from at using
# previous_offset).
def local_end
@local_end = at.add_with_convert(@previous_offset.utc_total_offset) unless @local_end
@local_end
end
# A TimeOrDateTime instance representing the local time when this transition
# causes the next observance to start (calculated from at using offset).
def local_start
@local_start = at.add_with_convert(@offset.utc_total_offset) unless @local_start
@local_start
end
# Returns true if this TimezoneTransitionInfo is equal to the given
# TimezoneTransitionInfo. Two TimezoneTransitionInfo instances are
# considered to be equal by == if offset, previous_offset and at are all
# equal.
def ==(tti)
tti.respond_to?(:offset) && tti.respond_to?(:previous_offset) && tti.respond_to?(:at) &&
offset == tti.offset && previous_offset == tti.previous_offset && at == tti.at
end
# Returns true if this TimezoneTransitionInfo is equal to the given
# TimezoneTransitionInfo. Two TimezoneTransitionInfo instances are
# considered to be equal by eql? if offset, previous_offset,
# numerator_or_time and denominator are all equal. This is stronger than ==,
# which just requires the at times to be equal regardless of how they were
# originally specified.
def eql?(tti)
tti.respond_to?(:offset) && tti.respond_to?(:previous_offset) &&
tti.respond_to?(:numerator_or_time) && tti.respond_to?(:denominator) &&
offset == tti.offset && previous_offset == tti.previous_offset &&
numerator_or_time == tti.numerator_or_time && denominator == tti.denominator
end
# Returns a hash of this TimezoneTransitionInfo instance.
def hash
@offset.hash ^ @previous_offset.hash ^ @numerator_or_time.hash ^ @denominator.hash
end
# Returns internal object state as a programmer-readable string.
def inspect
"#<#{self.class}: #{at.inspect},#{@offset.inspect}>"
end
end
end
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