Class: PEROBS::IDListPage

Inherits:
Object
  • Object
show all
Defined in:
lib/perobs/IDListPage.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(page_file, record, uid, values = []) ⇒ IDListPage

Returns a new instance of IDListPage.



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# File 'lib/perobs/IDListPage.rb', line 35

def initialize(page_file, record, uid, values = [])
  @page_file = page_file
  @record = record
  @uid = uid
  @values = values
  @record.page_entries = @values.length
end

Instance Attribute Details

#record ⇒ Object

Returns the value of attribute record.



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# File 'lib/perobs/IDListPage.rb', line 33

def record
  @record
end

#uid ⇒ Object (readonly)

Returns the value of attribute uid.



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# File 'lib/perobs/IDListPage.rb', line 32

def uid
  @uid
end

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'lib/perobs/IDListPage.rb', line 32

def values
  @values
end

Class Method Details

.load(page_file, uid, ref) ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 43

def IDListPage::load(page_file, uid, ref)
  page_file.load(uid, ref)
end

Instance Method Details

#check ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 89

def check
  last_value = nil
  @values.each_with_index do |v, i|
    if last_value && last_value >= v
      raise RuntimeError, "The values #{last_value} and #{v} must be " +
        "strictly ascending: #{@values.inspect}"
    end
    last_value = v
  end
end

#delete(max_id) ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 77

def delete(max_id)
  a = []
  @values.delete_if { |v| v > max_id ? a << v : false }

  unless a.empty?
    @record.page_entries = @values.length
    @page_file.mark_page_as_modified(self)
  end

  a
end

#include?(id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/perobs/IDListPage.rb', line 73

def include?(id)
  !(v = @values.bsearch { |v| v >= id }).nil? && v == id
end

#insert(id) ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 59

def insert(id)
  if is_full?
    raise ArgumentError, "IDListPage is already full"
  end
  index = @values.bsearch_index { |v| v >= id } || @values.length

  # If the value isn't stored already, insert it.
  if @values[index] != id
    @values.insert(index, id)
    @record.page_entries = @values.length
    @page_file.mark_page_as_modified(self)
  end
end

#is_full? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/perobs/IDListPage.rb', line 47

def is_full?
  @values.length >= @page_file.page_size
end

#length ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 51

def length
  @values.length
end

#save ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 55

def save
  @page_file.save_page(self)
end

#to_s ⇒ Object 



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# File 'lib/perobs/IDListPage.rb', line 100

def to_s
  "[ #{@values.join(', ')} ]"
end