note description: "Durations of date" 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: date class interface DATE_DURATION create make (y, m, d: INTEGER_32) -- Set year, month and day to y, m and d respectively. ensure year_set: year = y month_set: month = m day_set: day = d make_by_days (d: INTEGER_32) -- Set day to d. -- The duration is definite ensure day_set: day = d definite_duration: definite feature -- Initialization make (y, m, d: INTEGER_32) -- Set year, month and day to y, m and d respectively. ensure year_set: year = y month_set: month = m day_set: day = d make_by_days (d: INTEGER_32) -- Set day to d. -- The duration is definite ensure day_set: day = d definite_duration: definite feature -- Access date_default_format_string: STRING_8 -- Default output format for dates -- (from DATE_CONSTANTS) Date_time_tools: DATE_TIME_TOOLS -- Tools for outputting dates and times in different formats -- (from TIME_UTILITY) days_in_i_th_month (i, y: INTEGER_32): INTEGER_32 -- Number of days in the i th month at year y -- (from DATE_CONSTANTS) require -- from DATE_CONSTANTS i_large_enough: i >= 1 i_small_enough: i <= Months_in_year Days_in_leap_year: INTEGER_32 = 366 -- Number of days in a leap year -- (from DATE_CONSTANTS) Days_in_non_leap_year: INTEGER_32 = 365 -- Number of days in a non-leap year -- (from DATE_CONSTANTS) Days_in_week: INTEGER_32 = 7 -- Number of days in a week -- (from DATE_CONSTANTS) days_text: ARRAY [STRING_8] -- Short text representation of days -- (from DATE_CONSTANTS) default_format_string: STRING_8 -- Default output format string -- (from TIME_UTILITY) generating_type: TYPE [detachable DATE_DURATION] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty long_days_text: ARRAY [STRING_8] -- Long text representation of days -- (from DATE_CONSTANTS) long_months_text: ARRAY [STRING_8] -- Long text representation of months -- (from DATE_CONSTANTS) Max_weeks_in_year: INTEGER_32 = 53 -- Maximun number of weeks in a year -- (from DATE_CONSTANTS) Months_in_year: INTEGER_32 = 12 -- Number of months in year -- (from DATE_CONSTANTS) months_text: ARRAY [STRING_8] -- Short text representation of months -- (from DATE_CONSTANTS) zero: like Current -- Neutral element for "+" and "-" require -- from GROUP_ELEMENT True ensure -- from GROUP_ELEMENT result_exists: Result /= Void ensure then definite: Result.definite feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal (other: DATE_DURATION): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: like Current): BOOLEAN -- Are the current object and other equal? require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result ensure then result_definition: Result = (year = other.year and then month = other.month and then day = other.day) is_greater alias ">" (other: DATE_DURATION): BOOLEAN -- Is current object greater than other? -- (from PART_COMPARABLE) require -- from PART_COMPARABLE other_exists: other /= Void is_greater_equal alias ">=" (other: DATE_DURATION): BOOLEAN -- Is current object greater than or equal to other? -- (from PART_COMPARABLE) require -- from PART_COMPARABLE other_exists: other /= Void is_less alias "<" (other: like Current): BOOLEAN -- Is the current object smaller than other? -- It is impossible to compare not definite duration. require -- from PART_COMPARABLE other_exists: other /= Void ensure then definite_duration: (definite and then other.definite) implies Result = (day < other.day) non_definite_duration: (not definite or else not other.definite) implies not Result is_less_equal alias "<=" (other: DATE_DURATION): BOOLEAN -- Is current object less than or equal to other? -- (from PART_COMPARABLE) require -- from PART_COMPARABLE other_exists: other /= Void frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal (other: DATE_DURATION): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report canonical (date: DATE): BOOLEAN -- Is duration expressed minimally for adding to date, i.e. -- If addition will yield a date after date, then: -- year positive, -- month between 0 and Months_in_year - 1, -- day between 0 and (number of days of the month before -- the yielded) - 1? -- If addition will yield a date before date, then: -- year negative, -- month between 1 - Months_in_year and 0, -- day between (number of days of the month before the -- yielded) and 0? require date_exist: date /= Void conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void definite: BOOLEAN -- Is the duration is independent of the date -- on which it applies? (use of day only)? -- or not (use of year, month and day)? ensure result_definition: Result = ((year = 0) and then (month = 0)) has_origin_date: BOOLEAN -- Has origin date been set? is_leap_year (y: INTEGER_32): BOOLEAN -- Is year y a leap year? -- (from DATE_CONSTANTS) is_negative: BOOLEAN -- Is duration negative? -- (from DURATION) is_positive: BOOLEAN -- Is duration positive? is_zero: BOOLEAN -- Is duration zero? -- (from DURATION) same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) feature -- Status setting set_origin_date (d: detachable DATE) -- Set origin_date to d. ensure origin_date_set: origin_date = d feature -- Element change identity alias "+": DATE_DURATION -- Unary plus -- (from DURATION) ensure -- from GROUP_ELEMENT result_exists: Result /= Void result_definition: Result.is_equal (Current) minus alias "-" (other: DATE_DURATION): DATE_DURATION -- Difference with other -- (from DURATION) require -- from GROUP_ELEMENT other_exists: other /= Void ensure -- from GROUP_ELEMENT result_exists: Result /= Void feature -- Conversion to_canonical (start_date: DATE): like Current -- A new duration, equivalent to current one -- and canonical for date require start_date_not_void: start_date /= Void ensure canonical_result: Result.canonical (start_date) duration_not_changed: equal (start_date + Current, start_date + Result) to_date_time: DATE_TIME_DURATION -- Date-time version, with a zero time component ensure result_exists: Result /= Void year_set: Result.year = year month_set: Result.month = month day_set: Result.day = day to_definite (date: DATE) -- Make current duration definite. require date_exists: date /= Void ensure definite_result: definite feature -- Duplication copy (other: DATE_DURATION) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: DATE_DURATION) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: DATE_DURATION -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: DATE_DURATION) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: DATE_DURATION -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: DATE_DURATION -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable DATE_DURATION -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class opposite alias "-": like Current -- Unary minus require -- from GROUP_ELEMENT True ensure -- from GROUP_ELEMENT result_exists: Result /= Void result_definition: (Result + Current).is_equal (zero) ensure then origin_equal: equal (origin_date, Result.origin_date) plus alias "+" (other: like Current): like Current -- Sum of current object with other require -- from GROUP_ELEMENT other_exists: other /= Void ensure -- from GROUP_ELEMENT result_exists: Result /= Void commutative: Result.is_equal (other + Current) ensure then origin_equal: equal (origin_date, Result.origin_date) feature -- Attribute day: INTEGER_32 -- Number of days associated with current object days_count: INTEGER_32 -- Number of days in duration require origin_date_set: has_origin_date month: INTEGER_32 -- Number of monthes associated with current object origin_date: detachable DATE -- Origin date of duration year: INTEGER_32 -- Number of years associated with current object feature -- Element Change day_add (d: INTEGER_32) -- Add d days to Current. ensure day_set: day = old day + d month_add (m: INTEGER_32) -- Add m months to Current. ensure month_set: month = old month + m set_date (y, m, d: INTEGER_32) -- Set year with y, month with m and day with d. require -- from DATE_MEASUREMENT d_large_enough: d >= 1 m_large_enough: m >= 1 m_small_enough: m <= Months_in_year d_small_enough: d <= days_in_i_th_month (m, y) ensure -- from DATE_MEASUREMENT day_set: day = d month_set: month = m year_set: year = y set_day (d: INTEGER_32) -- Set day to d. require -- from DATE_MEASUREMENT d_large_enough: d >= 1 d_small_enough: d <= days_in_month ensure -- from DATE_MEASUREMENT day_set: day = d set_month (m: INTEGER_32) -- Set month to m. require -- from DATE_MEASUREMENT m_large_enough: m >= 1 m_small_enough: m <= Months_in_year d_small_enough: day <= days_in_i_th_month (m, year) ensure -- from DATE_MEASUREMENT month_set: month = m set_year (y: INTEGER_32) -- Set year to y. require -- from DATE_MEASUREMENT can_not_cut_29th_feb: day <= days_in_i_th_month (month, y) ensure -- from DATE_MEASUREMENT year_set: year = y year_add (y: INTEGER_32) -- Add y years to Current. ensure year_set: year = old year + y feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void feature -- Status Report days_in_month: INTEGER_32 -- Number of days in month 'month'. -- (from DATE_MEASUREMENT) ensure -- from DATE_MEASUREMENT positive_result: Result > 0 invariant equal_signs: (has_origin_date and then attached origin_date as l_origin_date and then canonical (l_origin_date)) implies (day >= 0 and month >= 0 and year >= 0) or (day <= 0 and month <= 0 and year <= 0) -- from DURATION sign_correctness: is_positive xor is_negative xor is_zero -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) -- from GROUP_ELEMENT neutral_addition: is_equal (Current + zero) self_subtraction: zero.is_equal (Current - Current) 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 DATE_DURATION
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