note description: "Durations of time" legal: "See notice at end of class." status: "See notice at end of class." date: "$Date: 2017-03-29 12:26:46 +0000 (Wed, 29 Mar 2017) $" revision: "$Revision: 100065 $" access: time class interface TIME_DURATION create make, make_fine, make_by_seconds, make_by_fine_seconds feature -- Initialization make (h, m, s: INTEGER_32) -- Set hour, minute and second to h, m, s respectively. ensure hour_set: hour = h minute_set: minute = m second_set: second = s make_fine (h, m: INTEGER_32; s: REAL_64) -- Set hour, minute' and second to h, m and truncated to -- integer part of s respectively. -- Set fractional_second to the fractional part of s. ensure hour_set: hour = h minute_set: minute = m fine_second_set: fine_second = s make_by_seconds (s: INTEGER_32) -- Set the object by the number of seconds s. ensure seconds_count_set: seconds_count = s make_by_fine_seconds (s: REAL_64) -- Set the object by the number of seconds s. ensure minute_large_enough: minute >= 0 minute_small_enough: minute < Minutes_in_hour second_large_enough: second >= 0 second_small_enough: second < Seconds_in_minute fine_seconds_set: dabs (fine_seconds_count - s) <= Tolerance feature -- Access fine_seconds_count: REAL_64 -- Number of seconds and fractionals of seconds of current duration seconds_count: INTEGER_32 -- Total number of seconds of current duration ensure same_count: Result = fine_seconds_count.truncated_to_integer zero: like Current -- Neutral element for "+" and "-" feature -- Attributes hour: INTEGER_32 -- Number of hours associated with current object minute: INTEGER_32 -- Number of minutes associated with current object second: INTEGER_32 -- Number of seconds associated with current object. fine_second: REAL_64 -- Number of fine seconds associated with current object fractional_second: REAL_64 feature -- Comparaison is_less alias "<" (other: like Current): BOOLEAN -- Is the current duration smaller than other? is_equal (other: like Current): BOOLEAN -- Is the current duration equal to other? feature -- Status report canonical: BOOLEAN -- Is duration expressed minimally, i.e. -- If duration is positive then -- hour positive, -- minute and second between 0 and 59, -- fractional_second between 0 and 999? -- If duration is negative then -- hour negative, -- minute and second between -59 and 0, -- fractional_second between -999 and 0? is_positive: BOOLEAN -- Is duration positive? feature -- Element Change set_second (s: INTEGER_32) -- Set second to s. -- fractional_second is cut down to 0. set_fine_second (s: REAL_64) -- Set fine_second to s. set_fractionals (f: REAL_64) -- Set fractional_second to f. -- f must have the same sign as second. set_minute (m: INTEGER_32) -- Set minute to m. set_hour (h: INTEGER_32) -- Set hour to h. feature -- Basic operations second_add (s: INTEGER_32) -- Add s seconds to the current duration. ensure second_set: second = old second + s fine_second_add (s: REAL_64) -- Add s seconds to the current time. -- if s has decimals, fractional_second is modifed. minute_add (m: INTEGER_32) -- Add m minutes to the current duration. ensure minute_set: minute = old minute + m hour_add (h: INTEGER_32) -- Add h hours to the current duration. ensure hour_set: hour = old hour + h plus alias "+" (other: like Current): like Current -- Sum with other opposite alias "-": like Current -- Unary minus feature -- Conversion to_canonical: like Current -- A new duration ensure result_canonical: Result.canonical to_days: INTEGER_32 -- Total number of days equivalent to the current duration time_modulo_day: like Current -- Duration modulo duration of a day ensure result_smaller_than_day: Result.seconds_count < Seconds_in_day result_positive: Result >= zero invariant fractionals_large_enough: fractional_second > -1.to_double fractionals_small_enough: fractional_second < 1.to_double fractional_and_second_same_sign: second.to_double * fractional_second >= 0.to_double equal_signs: canonical implies (hour >= 0 and minute >= 0 and fine_second >= 0.to_double) or (hour <= 0 and minute <= 0 and fine_second <= 0.to_double) note copyright: "Copyright (c) 1984-2017, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 5949 Hollister Ave., Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end -- class TIME_DURATION
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