Class: Filtered::Filter

Inherits:
Object
  • Object
show all
Defined in:
lib/scout/tsv/util/filter.rb

Overview

{{{ FILTER

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, match, value, persistence = nil) ⇒ Filter

Returns a new instance of Filter.



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# File 'lib/scout/tsv/util/filter.rb', line 24

def initialize(data, match, value, persistence = nil)
  @data = data
  @match = match
  @value = value
  @unsaved = []

  case 
  when Hash === persistence
    @persistence = persistence
  when String === persistence
    @persistence = begin
                     file = ScoutCabinet.open(persistence, true, "HDB")
                     TSV.setup file, :type => :list
                     file.extend TSVAdapter
                     file
                   end
    @persistence.read
  end

  @list = nil
  case
  when @match == :key
    @value = Set.new(@value)
    class << self
      self
    end.class_eval <<-EOC
      def match_entry(key, entry)
        key == @value or (Set === @value and @value.include? key)
      end
    EOC
  when @match.match(/field:(.*)/)
    @fieldnum = data.identify_field $1
    class << self
      self
    end.class_eval <<-EOC
      def match_entry(key, entry)
        value = entry[@fieldnum] 
        value == @value or (Array === value and value.include? @value)
      end
    EOC
  else
    raise "Unknown match: #{ @match }"
  end
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/scout/tsv/util/filter.rb', line 21

def data
  @data
end

#fieldnum ⇒ Object

Returns the value of attribute fieldnum.



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# File 'lib/scout/tsv/util/filter.rb', line 21

def fieldnum
  @fieldnum
end

#list ⇒ Object

Returns the value of attribute list.



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# File 'lib/scout/tsv/util/filter.rb', line 21

def list
  @list
end

#match ⇒ Object

Returns the value of attribute match.



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# File 'lib/scout/tsv/util/filter.rb', line 21

def match
  @match
end

#persistence ⇒ Object

Returns the value of attribute persistence.



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# File 'lib/scout/tsv/util/filter.rb', line 22

def persistence
  @persistence
end

#unsaved ⇒ Object

Returns the value of attribute unsaved.



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# File 'lib/scout/tsv/util/filter.rb', line 21

def unsaved
  @unsaved
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/scout/tsv/util/filter.rb', line 21

def value
  @value
end

Instance Method Details

#add(id) ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 132

def add(id)
  unsaved.push id
end

#add_unsaved ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 116

def add_unsaved
  save(Misc.merge_sorted_arrays(unsaved.sort, saved || [])) if unsaved.any?
  unsaved.clear
end

#clean ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 136

def clean
  add_unsaved
  if persistence and persistence.include? self.key
    persistence.write_and_close do
      persistence.delete self.key
    end
  else
    @list = nil
  end
end

#ids ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 121

def ids
  add_unsaved

  list = saved
  if list.nil?
    update
    list = saved
  end
  list
end

#key ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 69

def key
  case 
  when String === value
    value
  else
    Marshal.dump(value)
  end
end

#reset ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 147

def reset
  add_unsaved
  if persistence
    persistence.write_and_close do
      persistence.clear
    end
  else
    @list = nil
  end
end

#save(ids) ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 78

def save(ids)
  if persistence
    persistence.write_and_close do
      persistence[self.key] = ids
    end
  else
    if @list.nil?
      @list = ids
    else
      @list.replace ids
    end
  end
end

#saved ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 104

def saved
  if persistence.nil?
    return nil if list.nil?
    list
  else
    return nil if not persistence.include?(self.key)
    persistence.write_and_close do
      persistence[self.key]
    end
  end
end

#update ⇒ Object 



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# File 'lib/scout/tsv/util/filter.rb', line 92

def update
  ids = []

  data.with_unnamed do
    data.unfiltered_each do |key, entry|
      ids << key if match_entry(key, entry)
    end
  end

  save(ids.sort)
end