Created
March 10, 2011 15:01
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class Table | |
attr_reader :num_diners, :table_no | |
def initialize table_no, num_diners | |
@table_no = table_no | |
@num_diners = num_diners | |
end | |
def to_string | |
"Table #{@table_no} has #{@num_diners} diners" | |
end | |
def contented? | |
if rand(2) > 0 | |
return true | |
else | |
return false | |
end | |
end | |
def accept visitor | |
visitor.visitTable self | |
end | |
end | |
class DutchTable | |
attr_reader :aantal_gasten, :table_no | |
def initialize table_no, num_diners | |
@table_no = table_no | |
@aantal_gasten = num_diners | |
end | |
def to_string | |
"Table #{@table_no} has #{@aantal_gasten} diners (Dutch)" | |
end | |
def tevreden? | |
if rand(2) > 0 | |
return true | |
else | |
return false | |
end | |
end | |
def accept visitor | |
visitor.visitDutchTable self | |
end | |
end | |
class Waiter | |
def initialize tables | |
@tables = tables | |
end | |
end | |
class CountingWaiter < Waiter | |
attr_reader :no_of_diners | |
def count_diners | |
@no_of_diners = 0 | |
@tables.each { |table| table.accept self} | |
end | |
def visitTable table | |
@no_of_diners += table.num_diners | |
end | |
def visitDutchTable table | |
@no_of_diners += table.aantal_gasten | |
end | |
end | |
class ContentmentWaiter < Waiter | |
attr_reader :unhappy_tables | |
def get_unhappy_tables | |
@unhappy_tables = [] | |
@tables.each { |table| table.accept self } | |
end | |
def visitTable table | |
if !table.contented? | |
@unhappy_tables << table.table_no | |
end | |
end | |
def visitDutchTable table | |
if !table.tevreden? | |
@unhappy_tables << table.table_no | |
end | |
end | |
end | |
# create 10 tables | |
tables = [] | |
1..10.times do |i| | |
if rand(2) == 0 | |
tables << Table.new(i, rand(3) + 2) | |
else | |
tables << DutchTable.new(i, rand(3) + 2) | |
end | |
end | |
tables.each { |t| puts t.to_string} | |
# counting waiter goes to each table and adds up number of diners | |
waiter = CountingWaiter.new tables | |
waiter.count_diners | |
puts "Total number of diners: #{waiter.no_of_diners}" | |
# contentment waiter goes to each table and stores table number of all unhappy tables | |
waiter = ContentmentWaiter.new tables | |
waiter.get_unhappy_tables | |
puts "Unhappy tables: #{waiter.unhappy_tables}" |
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