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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.
#++
module TZInfo
# Represents an offset defined in a Timezone data file.
class TimezoneOffsetInfo #:nodoc:
# The base offset of the timezone from UTC in seconds.
attr_reader :utc_offset
# The offset from standard time for the zone in seconds (i.e. non-zero if
# daylight savings is being observed).
attr_reader :std_offset
# The total offset of this observance from UTC in seconds
# (utc_offset + std_offset).
attr_reader :utc_total_offset
# The abbreviation that identifies this observance, e.g. "GMT"
# (Greenwich Mean Time) or "BST" (British Summer Time) for "Europe/London". The returned identifier is a
# symbol.
attr_reader :abbreviation
# Constructs a new TimezoneOffsetInfo. utc_offset and std_offset are
# specified in seconds.
def initialize(utc_offset, std_offset, abbreviation)
@utc_offset = utc_offset
@std_offset = std_offset
@abbreviation = abbreviation
@utc_total_offset = @utc_offset + @std_offset
end
# True if std_offset is non-zero.
def dst?
@std_offset != 0
end
# Converts a UTC DateTime to local time based on the offset of this period.
def to_local(utc)
TimeOrDateTime.wrap(utc) {|wrapped|
wrapped + @utc_total_offset
}
end
# Converts a local DateTime to UTC based on the offset of this period.
def to_utc(local)
TimeOrDateTime.wrap(local) {|wrapped|
wrapped - @utc_total_offset
}
end
# Returns true if and only if toi has the same utc_offset, std_offset
# and abbreviation as this TimezoneOffsetInfo.
def ==(toi)
toi.respond_to?(:utc_offset) && toi.respond_to?(:std_offset) && toi.respond_to?(:abbreviation) &&
utc_offset == toi.utc_offset && std_offset == toi.std_offset && abbreviation == toi.abbreviation
end
# Returns true if and only if toi has the same utc_offset, std_offset
# and abbreviation as this TimezoneOffsetInfo.
def eql?(toi)
self == toi
end
# Returns a hash of this TimezoneOffsetInfo.
def hash
utc_offset.hash ^ std_offset.hash ^ abbreviation.hash
end
# Returns internal object state as a programmer-readable string.
def inspect
"#<#{self.class}: #@utc_offset,#@std_offset,#@abbreviation>"
end
end
end
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