--- /dev/null
+#--
+# 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 = RubyCoreSupport.rational_new!(@numerator_or_time, @denominator)
+ dt = RubyCoreSupport.datetime_new!(r, 0, Date::ITALY)
+ @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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