class Job < Array
attr_reader :name
def initialize(name)
@name = name
end
def get_time_required
0.0
end
end
class SubJob1 < Job
def initialize
super('sub job 1')
end
def get_time_required
1.0 # 1 minute to add flour and sugar
end
end
class SubJob2 < Job
def initialize
super('sub job 2')
end
def get_time_required
3.0 # Mix for 3 minutes
end
end
class CompositeJob < Job
def initialize(name)
super(name)
@sub_jobs = []
end
def add_sub_job(job)
@sub_jobs << job
end
def remove_sub_job(job)
@sub_jobs.delete(job)
end
def get_time_required
time=0.0
@sub_jobs.each {|job| time += job.get_time_required}
time
end
def <<(job)
@sub_jobs << job
end
def [](index)
@sub_jobs[index]
end
def []=(index, new_value)
@sub_jobs[index] = new_value
end
end
composite = CompositeJob.new('example')
composite << SubJob2.new
puts(composite[0].get_time_required)
composite[1] = SubJob1.new
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