Class: MyUW::SLNInfo

Inherits:
Object
  • Object
show all
Defined in:
lib/myuw/sln.rb

Overview

Synopsis

Gets information regarding a specific SLN, returning information in a SLN object.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(myuw) ⇒ SLNInfo

Returns a new instance of SLNInfo.



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# File 'lib/myuw/sln.rb', line 11

def initialize(myuw)
  @myuw = myuw
  @term = nil
  @data = nil
  @sln = nil
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/myuw/sln.rb', line 9

def data
  @data
end

#myuw ⇒ Object

Returns the value of attribute myuw.



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# File 'lib/myuw/sln.rb', line 8

def myuw
  @myuw
end

#sln ⇒ Object

Returns the value of attribute sln.



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# File 'lib/myuw/sln.rb', line 7

def sln
  @sln
end

#term ⇒ Object

Returns the value of attribute term.



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# File 'lib/myuw/sln.rb', line 6

def term
  @term
end

Instance Method Details

#check_time_schedule_closed(page) ⇒ Object

Checks if the time schedule system is closed and if so, raises an exception

Raises:



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# File 'lib/myuw/sln.rb', line 121

def check_time_schedule_closed(page)
  raise TimeScheduleClosedError.new if page.uri.to_s == "http://www.washington.edu/students/timeschd/nots.html"
end

#extract_info(keys, nodes) ⇒ Object

Extracts course information from each node and stores it as the proper key in the @data variable



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# File 'lib/myuw/sln.rb', line 100

def extract_info(keys, nodes)
  return false if nodes.empty?
  
  nodes.each_with_index do |node, i|
    # Make sure we have keys left still
    if i < keys.length then
      data_key = keys[i]
      
      # If the key is nil, we skip this node
      unless data_key.nil?
        @data ||= {}
        @data[data_key] = node.inner_text.strip.gsub("\302\240", "")
      end
    end
  end
  
  true
end

#fetch_data ⇒ Object

Fetches the information for the given SLN.

Raises:

  • (ArgumentError) 


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# File 'lib/myuw/sln.rb', line 31

def fetch_data
  raise ArgumentError.new("SLN not set.") if @sln.nil?
  raise ArgumentError.new("Term not set.") if @term.nil?
  raise NotLoggedInError.new("User must be logged in to fetch SLN data") unless @myuw.logged_in?
  
  # Request the actual page
  page = get_sln_page
  
  # Check if the time is not available
  check_time_schedule_closed page
  
  # Get the actual course information
  get_course_info page
  get_enrollment_info page
  get_course_notes page
end

#get_course_info(page) ⇒ Object

Gets the basic SLN info (the top table in the current status page)

Raises:



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# File 'lib/myuw/sln.rb', line 77

def get_course_info(page)
  data_keys = [nil, :course, :section, :type, :credits, :title]
  info_nodes = page.search("//table[@border=1 and @cellpadding=3]//tr[@rowspan=1]//td")
  raise InvalidPageError.new(page, "Could not extract course info for SLN.") unless extract_info(data_keys, info_nodes)
end

#get_course_notes(page) ⇒ Object

Gets the notes for a course

Raises:



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# File 'lib/myuw/sln.rb', line 92

def get_course_notes(page)
  data_keys = [:notes]
  info_nodes = page.search("//table[@border=1 and @cellpadding=3]//tr[count(td)=1]//preceding-sibling::tr[count(th)=1]//following-sibling::tr//td")
  raise InvalidPageError.new(page, "Could not find course notes information.") unless extract_info(data_keys, info_nodes)
end

#get_enrollment_info(page) ⇒ Object

Gets the enrollment information for an SLN such as current enrollment, space available, etc.

Raises:



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# File 'lib/myuw/sln.rb', line 85

def get_enrollment_info(page)
  data_keys = [:current_enrollment, :limit_enrollment, :room_capacity, :space_available, :status]
  info_nodes = page.search("//table[@border=1 and @cellpadding=3]//tr[count(td)=5]//td")
  raise InvalidPageError.new(page, "Could not extract enrollment info for SLN.") unless extract_info(data_keys, info_nodes)
end

#get_sln_page ⇒ Object

Gets the SLN info page for the SLN and term, raising an exception if it is requested too soon



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# File 'lib/myuw/sln.rb', line 64

def get_sln_page
  page = @myuw.browser.get("https://sdb.admin.washington.edu/timeschd/uwnetid/sln.asp?QTRYR=#{@term}&SLN=#{@sln}")
  if page.uri.to_s == "http://www.washington.edu/students/timeschd/badrequest.html"
    raise RequestSLNTooSoonError.new("Attempted to fetch SLN data too soon.")
  elsif page.body.to_s =~ /SLN: #{@sln} does not exist./
    raise InvalidSLNError.new("SLN does not exist.")
  end
  
  page
end