note
	description: "Facility routines to check the validity of DATE_TIMEs"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2009-01-01 12:38:30 +0000 (Thu, 01 Jan 2009) $"
	revision: "$Revision: 76534 $"

class 
	DATE_TIME_VALIDITY_CHECKER

create 
	default_create

feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end
	
feature {NONE} -- Access

	compact_date: INTEGER_32
		obsolete "Use `ordered_compact_date' instead. But be careful in your update since `compact_date' and `ordered_compact_date' do not have the same encoding. [2017-05-31]"
			-- Day, month and year coded.
			-- (from DATE_VALUE)
		do
			Result := year | (month |<< 16) | (day |<< 24)
		end

	compact_time: INTEGER_32
			-- Hour, minute, second coded.
			-- (from TIME_VALUE)

	date_default_format_string: STRING_8
			-- Default output format for dates
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Date_default_format_string
		end

	Date_time_tools: DATE_TIME_TOOLS
			-- Tools for outputting dates and times in different formats
			-- (from TIME_UTILITY)
		once
			create Result
		end

	day: INTEGER_32
			-- Day of the current object
			-- (from DATE_VALUE)
		do
			Result := ordered_compact_date & Day_mask
		end

	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
		do
			Result := Days_in_months @ i
			if i = 2 and then is_leap_year (y) then
				Result := Result + 1
			end
		end

	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)
		do
			Result := Date_time_tools.Days_text
		end

	default_format_string: STRING_8
			-- Default output format string
			-- (from TIME_UTILITY)
		do
			Result := Date_time_tools.Default_format_string
		end

	fine_second: REAL_64
			-- Representation of second with decimals
			-- (from TIME_VALUE)
		do
			Result := second.to_double + fractional_second
		end

	fractional_second: REAL_64
			-- Fractional part of fine_second
			-- (from TIME_VALUE)

	hour: INTEGER_32
			-- Hour of the current time
			-- (from TIME_VALUE)
		do
			Result := (compact_time & Hour_mask) |>> Hour_shift
		end

	Hours_in_day: INTEGER_32 = 24
			-- Number of hours in a day
			-- (from TIME_CONSTANTS)

	long_days_text: ARRAY [STRING_8]
			-- Long text representation of days
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Long_days_text
		end

	long_months_text: ARRAY [STRING_8]
			-- Long text representation of months
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Long_months_text
		end

	Max_weeks_in_year: INTEGER_32 = 53
			-- Maximun number of weeks in a year
			-- (from DATE_CONSTANTS)

	micro_second: INTEGER_32
			-- Microsecond of the current time
			-- (from TIME_VALUE)
		do
			Result := (fractional_second * 1000000.to_double).truncated_to_integer
			Result := Result \\ 1000
		end

	milli_second: INTEGER_32
			-- Millisecond of the current time
			-- (from TIME_VALUE)
		do
			Result := (fractional_second * 1000.to_double).truncated_to_integer
		end

	minute: INTEGER_32
			-- Minute of the current time
			-- (from TIME_VALUE)
		do
			Result := (compact_time & Minute_mask) |>> Minute_shift
		end

	Minutes_in_hour: INTEGER_32 = 60
			-- Number of minutes in an hour
			-- (from TIME_CONSTANTS)

	month: INTEGER_32
			-- Month of the current object
			-- (from DATE_VALUE)
		do
			Result := (ordered_compact_date & Month_mask) |>> Month_shift
		end

	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)
		do
			Result := Date_time_tools.Months_text
		end

	nano_second: INTEGER_32
			-- Nanosecond of the current time
			-- (from TIME_VALUE)
		do
			Result := (fractional_second * 1000000000.to_double).truncated_to_integer
			Result := Result \\ 1000
		end

	ordered_compact_date: INTEGER_32
			-- Year, month, day coded for fast comparison between dates.
			-- (from DATE_VALUE)

	second: INTEGER_32
			-- Second of the current time
			-- (from TIME_VALUE)
		do
			Result := compact_time & Second_mask
		end

	Seconds_in_day: INTEGER_32 = 86400
			-- Number of seconds in an hour
			-- (from TIME_CONSTANTS)

	Seconds_in_hour: INTEGER_32 = 3600
			-- Number of seconds in an hour
			-- (from TIME_CONSTANTS)

	Seconds_in_minute: INTEGER_32 = 60
			-- Number of seconds in a minute
			-- (from TIME_CONSTANTS)

	time_default_format_string: STRING_8
			-- Default output format for times
			-- (from TIME_CONSTANTS)
		do
			Result := Date_time_tools.Time_default_format_string
		end

	year: INTEGER_32
			-- Year of the current object
			-- (from DATE_VALUE)
		do
			Result := ((ordered_compact_date & Year_mask) |>> Year_shift) & 65535
		end
	
feature -- Access

	generating_type: TYPE [detachable DATE_TIME_VALIDITY_CHECKER]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end
	
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)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		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)
		end

	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)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		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))
		end

	frozen is_deep_equal (other: DATE_TIME_VALIDITY_CHECKER): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		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)
		end

	is_equal (other: DATE_TIME_VALIDITY_CHECKER): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		end

	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)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		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))
		end

	frozen standard_is_equal (other: DATE_TIME_VALIDITY_CHECKER): 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
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end
	
feature {NONE} -- Status report

	i_th_leap_year (i: INTEGER_32): BOOLEAN
		obsolete "Use `is_leap_year' instead. [2017-05-31]"
			-- (from DATE_CONSTANTS)
		do
			Result := is_leap_year (i)
		end

	is_leap_year (y: INTEGER_32): BOOLEAN
			-- Is year y a leap year?
			-- (from DATE_CONSTANTS)
		do
			Result := (mod (y, 4) = 0) and ((mod (y, 100) /= 0) or (mod (y, 400) = 0))
		end
	
feature -- Status report

	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
		external
			"built_in"
		end

	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
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature {NONE} -- Element change

	set_date (y, m, d: INTEGER_32)
			-- Set year with y, month with m and day with d.
			-- (from DATE_VALUE)
		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)
		local
			l_date: like ordered_compact_date
		do
			l_date := l_date & Day_mask.bit_not
			l_date := l_date | d
			l_date := l_date & Month_mask.bit_not
			l_date := l_date | (m |<< Month_shift)
			l_date := l_date & Year_mask.bit_not
			l_date := l_date | (y |<< Year_shift)
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			day_set: day = d
			month_set: month = m
			year_set: year = y
		end

	set_day (d: INTEGER_32)
			-- Set day to d.
			-- (from DATE_VALUE)
		require -- from DATE_MEASUREMENT
			d_large_enough: d >= 1
			d_small_enough: d <= days_in_month
		local
			l_date: like ordered_compact_date
		do
			l_date := ordered_compact_date
			l_date := l_date & Day_mask.bit_not
			l_date := l_date | d
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			day_set: day = d
		end

	set_fine_second (s: REAL_64)
			-- Set fine_second to s
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			s_large_enough: s >= 0.to_double
			s_small_enough: s < Seconds_in_minute.to_double
		local
			s_tmp: INTEGER_32
		do
			s_tmp := s.truncated_to_integer
			set_second (s_tmp)
			fractional_second := s - s_tmp.to_double
		ensure -- from TIME_MEASUREMENT
			fine_second_set: fine_second = s
		end

	set_fractionals (f: REAL_64)
			-- Set fractional_second to f.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			f_large_enough: f >= 0.to_double
			f_small_enough: f < 1.to_double
		do
			fractional_second := f
		ensure -- from TIME_MEASUREMENT
			second_same: second = old second
		end

	set_hour (h: INTEGER_32)
			-- Set hour to h.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			h_large_enough: h >= 0
			h_small_enough: h < Hours_in_day
		do
			compact_time := compact_time & Hour_mask.bit_not
			compact_time := compact_time | (h |<< Hour_shift)
		ensure -- from TIME_MEASUREMENT
			hour_set: hour = h
		end

	set_internal_compact_date (a_compact_date: like compact_date)
		obsolete "Use `ordered_compact_date' instead. But be careful in your update since `compact_date' and `ordered_compact_date' do not have the same encoding. [2017-05-31]"
			-- Set a_compact_date to compact_date.
			-- (from DATE_VALUE)
		do
			set_private_internal_compact_date (a_compact_date)
		ensure -- from DATE_VALUE
			compact_date_set: year | (month |<< 16) | (day |<< 24) = a_compact_date
		end

	set_internal_ordered_compact_date (a_ordered_compact_date: like ordered_compact_date)
			-- Set a_ordered_compact_date to ordered_compact_date.
			-- (from DATE_VALUE)
		do
			ordered_compact_date := a_ordered_compact_date
		ensure -- from DATE_VALUE
			ordered_compact_date_set: ordered_compact_date = a_ordered_compact_date
		end

	set_minute (m: INTEGER_32)
			-- Set minute to m.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			m_large_enough: m >= 0
			m_small_enough: m < Minutes_in_hour
		do
			compact_time := compact_time & Minute_mask.bit_not
			compact_time := compact_time | (m |<< Minute_shift)
		ensure -- from TIME_MEASUREMENT
			minute_set: minute = m
		end

	set_month (m: INTEGER_32)
			-- Set month to m.
			-- (from DATE_VALUE)
		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)
		local
			l_date: like ordered_compact_date
		do
			l_date := ordered_compact_date
			l_date := l_date & Month_mask.bit_not
			l_date := l_date | (m |<< Month_shift)
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			month_set: month = m
		end

	set_second (s: INTEGER_32)
			-- Set second to s.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			s_large_enough: s >= 0
			s_small_enough: s < Seconds_in_minute
		do
			compact_time := compact_time & Second_mask.bit_not
			compact_time := compact_time | s
		ensure -- from TIME_MEASUREMENT
			second_set: second = s
		end

	set_year (y: INTEGER_32)
			-- Set year to y.
			-- (from DATE_VALUE)
		require -- from DATE_MEASUREMENT
			can_not_cut_29th_feb: day <= days_in_i_th_month (month, y)
		local
			l_date: like ordered_compact_date
		do
			l_date := ordered_compact_date
			l_date := l_date & Year_mask.bit_not
			l_date := l_date | (y |<< Year_shift)
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			year_set: year = y
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	copy (other: DATE_TIME_VALIDITY_CHECKER)
			-- 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)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: DATE_TIME_VALIDITY_CHECKER)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: DATE_TIME_VALIDITY_CHECKER
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: DATE_TIME_VALIDITY_CHECKER)
			-- 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)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: DATE_TIME_VALIDITY_CHECKER
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: DATE_TIME_VALIDITY_CHECKER
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature {NONE} -- Basic operations

	div (i, j: INTEGER_32): INTEGER_32
			-- (i \\ j) if i positive
			-- (i \\ j + 1) if i negative
			-- (from TIME_UTILITY)
		do
			Result := i // j
			if Result.to_double > i / j then
				Result := Result - 1
			end
		ensure -- from TIME_UTILITY
			result_definition: i = j * Result + mod (i, j)
		end

	mod (i, j: INTEGER_32): INTEGER_32
			-- (i \\ j) if i positive
			-- (i \\ j + j) if i negative
			-- (from TIME_UTILITY)
		do
			Result := i \\ j
			if Result < 0 then
				Result := Result + j
			end
		ensure -- from TIME_UTILITY
			positive_result: Result >= 0
			result_definition: i = j * div (i, j) + Result
		end
	
feature -- Basic operations

	frozen as_attached: attached DATE_TIME_VALIDITY_CHECKER
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable DATE_TIME_VALIDITY_CHECKER
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end
	
feature {NONE} -- Implementation

	Compact_date_attribute_name: STRING_8 = "compact_date"
			-- Name of compacte_date attribute in 5.3 and older version.
			-- (from DATE_VALUE)

	Day_mask: INTEGER_32 = 255
			-- (from DATE_VALUE)

	Day_shift: INTEGER_32 = 0
			-- Shift needed to extract/set year, month and day.
			-- (from DATE_VALUE)

	Days_in_months: ARRAY [INTEGER_32]
			-- Array containing number of days for each month of
			-- a non-leap year.
			-- (from DATE_CONSTANTS)
		once
			Result := <<31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31>>
		ensure -- from DATE_CONSTANTS
			result_exists: Result /= Void
			valid_count: Result.count = Months_in_year
		end

	Hour_mask: INTEGER_32 = 16711680
			-- (from TIME_VALUE)

	Hour_shift: INTEGER_32 = 16
			-- (from TIME_VALUE)

	Minute_mask: INTEGER_32 = 65280
			-- (from TIME_VALUE)

	Minute_shift: INTEGER_32 = 8
			-- Shift needed to extract/set hour and minute.
			-- (from TIME_VALUE)

	Month_mask: INTEGER_32 = 65280
			-- (from DATE_VALUE)

	Month_shift: INTEGER_32 = 8
			-- (from DATE_VALUE)

	Second_mask: INTEGER_32 = 255
			-- Mask used to extract/set hour, minute and second.
			-- (from TIME_VALUE)

	set_private_internal_compact_date (a_compact_date: like compact_date)
			-- Set a_compact_date to compact_date.
			-- (from DATE_VALUE)
		do
			set_date (a_compact_date & 65535, (a_compact_date & 16711680) |>> 16, ((a_compact_date & 4278190080) |>> 24) & 255)
		ensure -- from DATE_VALUE
			compact_date_set: year | (month |<< 16) | (day |<< 24) = a_compact_date
		end

	Year_mask: INTEGER_32 = 4294901760
			-- Mask used to extract/set year, month and day.
			-- (from DATE_VALUE)

	Year_shift: INTEGER_32 = 16
			-- (from DATE_VALUE)
	
feature {NONE} -- Correction

	correct_mismatch
			-- Attempt to correct object mismatch using Mismatch_information.
			-- (from DATE_VALUE)
		do
			if attached {INTEGER_32_REF} Mismatch_information.item (Compact_date_attribute_name) as l_compact_date then
				set_private_internal_compact_date (l_compact_date.item)
			else
				Precursor {MISMATCH_CORRECTOR}
			end
		end

	Mismatch_information: MISMATCH_INFORMATION
			-- Original attribute values of mismatched object
			-- (from MISMATCH_CORRECTOR)
		once
			create Result
		end
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result
			Result.set_output_default
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		do
			Result := tagged_out
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		do
			if o /= Void then
				Io.put_string (o.out)
			end
		ensure -- from ANY
			instance_free: class
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
		end
	
feature -- Preconditions

	date_time_valid (s: STRING_8; code_string: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE_TIME
			-- And does the string s correspond to code_string?
		require
			s_exists: s /= Void
			code_exists: code_string /= Void
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			Result := code.precise and code.correspond (s) and then code.is_date_time (s)
		end

	date_time_valid_with_base (s: STRING_8; code_string: STRING_8; base: INTEGER_32): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE_TIME
			-- And does the string s correspond to code_string?
			-- Use base century base.
		require
			s_exists: s /= Void
			code_exists: code_string /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			code.set_base_century (base)
			Result := code.precise and code.correspond (s) and then code.is_date_time (s)
		end

	is_correct_date_time (y, mo, d, h, mi: INTEGER_32; s: REAL_64; twelve_hour_scale: BOOLEAN): BOOLEAN
			-- Is date-time specified by y, mo, d, h, mi, s
			-- correct?
			-- twelve_hour_scale specifies if the hour range is 1 - 12
			-- (if True) or 0 - 23 (if False).
		do
			Result := is_correct_date (y, mo, d) and is_correct_time (h, mi, s, twelve_hour_scale)
		end
	
feature {NONE} -- Preconditions

	compact_date_valid (c_d: INTEGER_32): BOOLEAN
			-- Is compact date c_d valid?
			-- (from DATE_VALIDITY_CHECKER)
		local
			l_cd: INTEGER_32
			y, m, d: INTEGER_32
		do
			l_cd := ordered_compact_date
			set_private_internal_compact_date (c_d)
			d := day
			m := month
			y := year
			ordered_compact_date := l_cd
			Result := is_correct_date (y, m, d)
		end

	compact_time_valid (c_t: INTEGER_32): BOOLEAN
			-- Is compact time c_t valid?
			-- (from TIME_VALIDITY_CHECKER)
		local
			h, m, s: INTEGER_32
			l_c_t: like compact_time
		do
			l_c_t := compact_time
			compact_time := c_t
			h := hour
			m := minute
			s := second
			compact_time := l_c_t
			Result := h >= 0 and h < Hours_in_day and m >= 0 and m < Minutes_in_hour and s >= 0 and s < Seconds_in_minute
		end

	date_valid (s: STRING_8; code_string: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to code_string?
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			Result := code.precise_date and code.correspond (s) and then code.is_date (s)
		end

	date_valid_default (s: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to
			-- date_default_format_string?
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
		do
			Result := date_valid (s, date_default_format_string)
		end

	date_valid_default_with_base (s: STRING_8; base: INTEGER_32): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to
			-- date_default_format_string?
			-- Use base century base.
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
		do
			Result := date_valid_with_base (s, date_default_format_string, base)
		end

	date_valid_with_base (s: STRING_8; code_string: STRING_8; base: INTEGER_32): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to code_string?
			-- Use base century base.
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			code.set_base_century (base)
			Result := code.precise_date and code.correspond (s) and then code.is_date (s)
		end

	is_correct_date (y, m, d: INTEGER_32): BOOLEAN
			-- Is date specified by y, m, and d a correct date?
			-- (from DATE_VALIDITY_CHECKER)
		do
			Result := m >= 1 and m <= Months_in_year and then d >= 1 and d <= days_in_i_th_month (m, y) and then y >= 0 and then y <= 65535
		end

	is_correct_time (h, m: INTEGER_32; s: REAL_64; twelve_hour_scale: BOOLEAN): BOOLEAN
			-- Is time represented by h, m, code, and s correct?
			-- twelve_hour_scale specifies if the hour range is 1 - 12
			-- (if True) or 0 - 23 (if False).
			-- (from TIME_VALIDITY_CHECKER)
		local
			min_hour: INTEGER_32
			max_hour: INTEGER_32
		do
			if twelve_hour_scale then
				min_hour := 1
				max_hour := 12
			else
				min_hour := 0
				max_hour := Hours_in_day - 1
			end
			Result := h >= min_hour and h <= max_hour and then m >= 0 and m < Minutes_in_hour and then s >= 0.to_double and s < Seconds_in_minute.to_double
		end

	ordered_compact_date_valid (c_d: INTEGER_32): BOOLEAN
			-- Is compact date c_d valid?
			-- (from DATE_VALIDITY_CHECKER)
		local
			l_cd: INTEGER_32
			y, m, d: INTEGER_32
		do
			l_cd := ordered_compact_date
			ordered_compact_date := c_d
			d := day
			m := month
			y := year
			ordered_compact_date := l_cd
			Result := is_correct_date (y, m, d)
		end

	time_valid (s: STRING_8; code_string: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- to create an instance of type TIME?
			-- And does the string s correspond to code_string?
			-- (from TIME_VALIDITY_CHECKER)
		require -- from TIME_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			Result := code.precise_time and code.correspond (s) and then code.is_time (s)
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_8
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ")
				create l_exc
				l_msg.append (generating_type.name)
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
feature {NONE} -- Status Report

	days_in_month: INTEGER_32
			-- Number of days in month 'month'.
			-- (from DATE_MEASUREMENT)
		do
			Result := days_in_i_th_month (month, year)
		ensure -- from DATE_MEASUREMENT
			positive_result: Result > 0
		end
	
invariant
		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

note
	copyright: "Copyright (c) 1984-2009, 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_TIME_VALIDITY_CHECKER

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