Question

Using Ruby

A dentist appointment schedule validation software

Implement a superclass Appointment and sub classes OneTime, Day and Month. An appointment has a description (for example, "Root Canal"), and dates information (you can use Date object or int Year, Int Month, Int Day). Fill an array of Appointment objects with a mixture of appointments.

Write a method OccursOn inside each of the sub classes that checks whether the appointment occurs on that date (OneTime), day (Day) or month (Month). Ask the user to enter a date to check (for example, 2006 10 5), and ask to user if they want to check against OneTime, Day or Month appointment. Based on what the user selected, OccursOn inside each of the sub class should run and display any matching appointment and associated descriptions.

Hint: For OneTime subclass, OccursOn need three inputs (Year, Month and Day) to validate, for Day subclass, OccursOn needs one input (Day) to validate, and for Month subclass, OccursOn need one input (Month) to validate. OccursOn is different for different subclasses.

Answer 1

1). ANSWER :

GIVENTHAT :

inquiry.rb

#!/usr/bin/env ruby

require_relative 'appointment'

def generateAppointment(clazz)
    app = Appointment.getInstance(clazz)
    r = Random.new()
    app.day = r.rand(1..10000000) % 30 + 1
    app.month = r.rand(1..10000000) % 12 + 1
    app.year = r.rand(2014..2017)
    app.description = "#{app.class} appointment on #{app.month}/#{app.day}/#{app.year}"
    app
end

def generateArray(size)
    apps = []
    # get a rand for class type
    r = Random.new((Time.now.to_f * 100000).round)
    for i in 0..size
        # 0 for OneTime, 1 for Day, 2 for Month
        c = r.rand(0..2)
        case (c)
        when 0
            apps[i] = generateAppointment(:OneTime)
        when 1
            apps[i] = generateAppointment(:Day)
        when 2
            apps[i] = generateAppointment(:Month)
        end
    end
    apps
end

def hints
    puts ' '
    puts 'Search appointments:'
    puts '0: Print all'
    puts '1: One time'
    puts '2: Day'
    puts '3: Month'
    puts '4: Exit'
    puts 'Enter your choice (1..4):'
end

if __FILE__ == $PROGRAM_NAME
    choice = 0
    size = 50
    apps = generateArray(size)
    while choice != 4
        hints
        choice = gets.to_i
        case choice
        when 0
            for i in 0..size
                puts apps[i].description
            end
        when 1
            puts 'Enter a date(mm/dd/yyyy):'
            d = gets.chomp
            nums = d.split('/', 3)
            for i in 0..size
                if apps[i].class.to_s == 'OneTime' && apps[i].occursOn(nums[1].to_i, nums[0].to_i, nums[2].to_i)
                    puts apps[i].description
                end
            end
        when 2
            puts 'Enter a day(1..30) (we do not work on 31th):'
            d = gets.to_i
            for i in 0..size
                puts apps[i].description if apps[i].class.to_s == 'Day' && apps[i].occursOn(d, 0, 0)
            end
        when 3
            puts 'Enter a month(1..12):'
            d = gets.to_i
            for i in 0..size
                puts apps[i].description if apps[i].class.to_s == 'Month' && apps[i].occursOn(0, d, 0)
            end
        when 4
            puts 'Goodbye.'
        end
        puts
    end
end

appointment.rb

class Appointment
    attr_accessor :description, :day, :month, :year
    attr_reader :appType

    def occursOn(day, month, year)
        raise 'Not implemented'
    end

    #
    # Class members
    #
    @@subclass_registar = {}

    def self.registerClass(clazz)
        @@subclass_registar[clazz] = self
    end

    def self.getInstance(clazz)
        clazz = @@subclass_registar[clazz]
        if clazz
            clazz.new
        else
            raise "Error: No such type"
        end
    end
end

class OneTime < Appointment

    def occursOn(day, month, year)
        if @day == day && @month == month && @year == year
            return true
        end
        false
    end

    # register subtype
    registerClass(:OneTime)

end

class Day < Appointment

    def occursOn(day, month, year)
        if @day == day
            return true
        end
        false
    end

    # register subtype
    registerClass(:Day)
end

class Month < Appointment

    def occursOn(day, month, year)
        if @month == month
            return true
        end
        false
    end

    # register subtype
    registerClass(:Month)
end